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* [Bug middle-end/89008] [7/8 Regression] O2 and O1 results differ for simple test
[not found] <bug-89008-4@http.gcc.gnu.org/bugzilla/>
@ 2019-01-24 9:32 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: rguenth at gcc dot gnu.org @ 2019-01-24 9:32 UTC (permalink / raw)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89008
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jan 24 09:31:51 2019
New Revision: 268234
URL: https://gcc.gnu.org/viewcvs?rev=268234&root=gcc&view=rev
Log:
2019-01-24 Richard Biener <rguenther@suse.de>
Backport from mainline
2019-01-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/89008
* tree-ssa-reassoc.c (eliminate_using_constants): For * 0 do
not leave another stray operand.
* gcc.dg/torture/pr89008.c: New testcase.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.dg/torture/pr89008.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/tree-ssa-reassoc.c
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Subject: [Bug middle-end/89008] [7/8 Regression] O2 and O1 results differ for simple test
Date: Thu, 24 Jan 2019 09:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89008
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Bill, you now need r268233 or earlier on the GCC 8 branch to reproduce the
latent issue.
>From gcc-bugs-return-630635-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 09:36:08 2019
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/89031] Should not report unused result when explicitly cast to void
Date: Thu, 24 Jan 2019 09:36:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Indeed (didnt' find resolved invalid dups with the warning in comments though)
>From gcc-bugs-return-630639-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 09:38:52 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/65608] [meta-bug] friend issues
Date: Thu, 24 Jan 2019 09:38:00 -0000
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Bug 65608 depends on bug 34724, which changed state.
Bug 34724 Summary: Trouble with friend declaration across namespaces
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=34724
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Subject: [Bug c++/34724] Trouble with friend declaration across namespaces
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=34724
Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think this is another dup of PR 43694
*** This bug has been marked as a duplicate of bug 43694 ***
>From gcc-bugs-return-630638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 09:38:51 2019
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Subject: [Bug c++/43694] G++ accepts a template friend with the wrong template parameters
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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CC| |paolo.carlini at oracle dot com
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 34724 has been marked as a duplicate of this bug. ***
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Subject: [Bug web/89032] Missing documentation for GCC 7.4.0
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-630640-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 09:40:20 2019
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Subject: [Bug c/89031] Should not report unused result when explicitly cast to void
Date: Thu, 24 Jan 2019 09:40:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> Indeed (didnt' find resolved invalid dups with the warning in comments
> though)
Because it was left unconfirmed ...
PR 66425.
*** This bug has been marked as a duplicate of bug 66425 ***
>From gcc-bugs-return-630641-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 09:40:25 2019
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Subject: [Bug c/66425] (void) cast doesn't suppress __attribute__((warn_unused_result))
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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CC| |porton at narod dot ru
--- Comment #37 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 89031 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/51584] Erroneous compilation when deriving from an inaccessible friend class.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51584
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|NEW |RESOLVED
Last reconfirmed|2015-03-27 00:00:00 |2019-1-24
Blocks|65608 |59002
Resolution|--- |DUPLICATE
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> I think this is related to PR 47346.
Yes, it has nothing to do with the friend declaration.
*** This bug has been marked as a duplicate of bug 47346 ***
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59002
[Bug 59002] [meta-bug] Access checking in templates
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65608
[Bug 65608] [meta-bug] friend issues
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Subject: [Bug c++/59002] [meta-bug] Access checking in templates
Date: Thu, 24 Jan 2019 09:45:00 -0000
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Bug 59002 depends on bug 51584, which changed state.
Bug 51584 Summary: Erroneous compilation when deriving from an inaccessible friend class.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51584
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
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Subject: [Bug c++/47346] access control for nested type is ignored in class template
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47346
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |prasoonsaurav.nit at gmail dot com
--- Comment #17 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 51584 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/51757] friend defined inside class and declared inside main linker error
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51757
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |link-failure
Last reconfirmed|2012-01-05 00:00:00 |2019-1-24
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Still present on trunk. Clang and EDG emit the definition of func. No version
of GCC I tested (back to 4.3.6) does.
Slightly reduced:
struct A
{
friend void func() { }
};
int main()
{
void func();
func(); //linker error undefined reference to `func()'
}
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Subject: [Bug c/88993] GCC 9 -Wformat-overflow=2 should reflect real libc limits
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88993
--- Comment #6 from Richard W.M. Jones <rjones at redhat dot com> ---
I switched the warning off in libguestfs, but before it was
switched off I got all these warnings (errors in fact because
we use -Werror in development builds).
qemuopts.c: In function 'qemuopts_to_config_channel':
qemuopts.c:987:29: error: '%.*s' directive output between 0 and 2147483647
bytes may exceed minimum required size of 4095 [-Werror=format-overflow=]
987 | fprintf (fp, " %.*s = ", (int) k, values[j]);
| ^~~~
qemuopts.c:987:26: note: assuming directive output of 1 byte
987 | fprintf (fp, " %.*s = ", (int) k, values[j]);
| ^~~~~~~~~~~
utils.c: In function 'guestfs_int_full_path':
utils.c:729:27: error: '%.*s' directive output between 0 and 2147483647 bytes
may exceed minimum required size of 4095 [-Werror=format-overflow=]
729 | r = asprintf (&path, "%.*s", len, dir);
| ^~~~
utils.c:729:26: note: assuming directive output of 1 byte
729 | r = asprintf (&path, "%.*s", len, dir);
| ^~~~~~
utils.c:727:27: error: '%.*s' directive output between 0 and 2147483647 bytes
may exceed minimum required size of 4095 [-Werror=format-overflow=]
727 | r = asprintf (&path, "%.*s/%s", len, dir, name);
| ^~~~
utils.c:727:26: note: assuming directive output of 1 byte
727 | r = asprintf (&path, "%.*s/%s", len, dir, name);
| ^~~~~~~~~
utils.c:727:26: note: assuming directive output of 1 byte
In file included from info.c:43:
info.c: In function 'parse_json':
info.c:205:13: error: '%.*s' directive output between 0 and 2147483647 bytes
may exceed minimum required size of 4095 [-Werror=format-overflow=]
205 | debug (g, "%s: qemu-img info JSON output:\n%.*s\n", __func__, (int)
len, input);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
guestfs-internal.h:577:49: note: in definition of macro 'debug'
577 | do { if ((g)->verbose) guestfs_int_debug ((g),__VA_ARGS__); } while
(0)
| ^~~~~~~~~~~
info.c:205:46: note: format string is defined here
205 | debug (g, "%s: qemu-img info JSON output:\n%.*s\n", __func__, (int)
len, input);
| ^~~~
In file included from info.c:43:
info.c:205:13: note: assuming directive output of 1 byte
205 | debug (g, "%s: qemu-img info JSON output:\n%.*s\n", __func__, (int)
len, input);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
guestfs-internal.h:577:49: note: in definition of macro 'debug'
577 | do { if ((g)->verbose) guestfs_int_debug ((g),__VA_ARGS__); } while
(0)
| ^~~~~~~~~~~
btrfs.c: In function 'do_btrfs_filesystem_show':
btrfs.c:2127:27: error: '%.*s' directive output between 0 and 2147483647 bytes
may exceed minimum required size of 4095 [-Werror=format-overflow=]
2127 | add_sprintf (&ret, "%.*s", (int) (end - p), p);
| ^~~~
btrfs.c:2127:26: note: assuming directive output of 1 byte
2127 | add_sprintf (&ret, "%.*s", (int) (end - p), p);
| ^~~~~~
log.c: In function 'do_log':
log.c:390:17: error: '%.*s' directive output between 0 and 2147483647 bytes may
exceed minimum required size of 4095 [-Werror=format-overflow=]
390 | printf (" %.*s", (int) comm_len, comm);
| ^~~~
log.c:390:15: note: assuming directive output of 1 byte
390 | printf (" %.*s", (int) comm_len, comm);
| ^~~~~~~
log.c:388:17: error: '%.*s' directive output between 0 and 2147483647 bytes may
exceed minimum required size of 4095 [-Werror=format-overflow=]
388 | printf (" %.*s", (int) identifier_len, identifier);
| ^~~~
log.c:388:15: note: assuming directive output of 1 byte
388 | printf (" %.*s", (int) identifier_len, identifier);
| ^~~~~~~
log.c:394:17: error: '%.*s' directive output between 0 and 2147483647 bytes may
exceed minimum required size of 4095 [-Werror=format-overflow=]
394 | printf ("[%.*s]", (int) pid_len, pid);
| ^~~~
log.c:394:15: note: assuming directive output of 1 byte
394 | printf ("[%.*s]", (int) pid_len, pid);
| ^~~~~~~~
log.c:404:17: error: '%.*s' directive output between 0 and 2147483647 bytes may
exceed minimum required size of 4095 [-Werror=format-overflow=]
404 | printf (" %.*s", (int) message_len, message);
| ^~~~
log.c:404:15: note: assuming directive output of 1 byte
404 | printf (" %.*s", (int) message_len, message);
| ^~~~~~~
../common/utils/utils.c: In function 'guestfs_int_full_path':
../common/utils/utils.c:729:27: error: '%.*s' directive output between 0 and
2147483647 bytes may exceed minimum required size of 4095
[-Werror=format-overflow=]
729 | r = asprintf (&path, "%.*s", len, dir);
| ^~~~
../common/utils/utils.c:729:26: note: assuming directive output of 1 byte
729 | r = asprintf (&path, "%.*s", len, dir);
| ^~~~~~
../common/utils/utils.c:727:27: error: '%.*s' directive output between 0 and
2147483647 bytes may exceed minimum required size of 4095
[-Werror=format-overflow=]
727 | r = asprintf (&path, "%.*s/%s", len, dir, name);
| ^~~~
../common/utils/utils.c:727:26: note: assuming directive output of 1 byte
727 | r = asprintf (&path, "%.*s/%s", len, dir, name);
| ^~~~~~~~~
../common/utils/utils.c:727:26: note: assuming directive output of 1 byte
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Subject: [Bug c++/52625] [7/8/9 Regression] Incorrect specialization semantics of friend class template declaration
Date: Thu, 24 Jan 2019 09:55:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2012-03-20 00:00:00 |2019-1-24
CC| |jason at gcc dot gnu.org
Known to work| |4.4.7
Summary|Incorrect specialization |[7/8/9 Regression]
|semantics of friend class |Incorrect specialization
|template declaration |semantics of friend class
| |template declaration
Known to fail| |4.5.4, 7.4.0, 8.2.0, 9.0
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This was accepted by 4.4.7 but not 4.5.0
It regressed with r154223 "PR c++/13950, DR 176" (which was indeed related to
finding the injected-class-name in a base class).
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Subject: [Bug tree-optimization/89027] [9 Regression] ICE: verify_gimple failed (Error: non-trivial conversion at assignment)
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45517
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45517&action=edit
gcc9-pr89027.patch
Untested fix.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89020
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2019-01-24
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> If virtualbox's shared folders are doing strange things with
> files or is broken, not much that the gfortran developers
> can do about that.
Hence closing as WONTFIX?
>From gcc-bugs-return-630650-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:16:41 2019
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/89001] g++ uses wrong mangling for lifetime-extended temporaries
Date: Thu, 24 Jan 2019 10:16:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So do we need a GTY hash table mapping VAR_DECLs to lifetime-extended temporary
count and use that during the mangling?
>From gcc-bugs-return-630651-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:21:22 2019
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/87187] FAIL: gfortran.dg/short_circuiting_3.f90 -g -flto (internal compiler error) on darwin
Date: Thu, 24 Jan 2019 10:21:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, so we end up here via force_decl_die which forces declaration == 1. But
then
/* A concrete instance, tag a new DIE with DW_AT_abstract_origin. */
if (origin != NULL)
{
gcc_assert (!declaration || local_scope_p (context_die));
where origin == decl because decl_ultimate_origin returns decl itself
since its DECL_ABSTRACT_ORIGIN points to itself but it is not DECL_ABSTRACT_P.
In the end we force the decl as context for a limbo DIE for a local static
in the function ('i').
We're still doing that set_decl_origin_self on stuff via
dwarf2out_abstract_function (tried to get rid of that repeatedly...).
We're fooling dwarf2out here that an abstract origin DIE exists but with
the LTO workaround it doesn't.
On Linux if we compile with -g0 the DECL_ABSTRACT_ORIGIN will not be set
while on Darwin compiling with -g will just elide the LTO part but still
set DECL_ABSTRACT_ORIGIN. We cannot simply not stream DECL_ABSTRACT_ORIGIN
if debug_info_level == DINFO_LEVEL_NONE because IIRC it is used for other
stuff as well(?). Maybe just eliding the self-origin case works.
So I am testing
Index: gcc/tree-streamer-out.c
===================================================================
--- gcc/tree-streamer-out.c (revision 268233)
+++ gcc/tree-streamer-out.c (working copy)
@@ -603,7 +603,16 @@ write_ts_decl_common_tree_pointers (stru
special handling in LTO, it must be handled by streamer hooks. */
stream_write_tree (ob, DECL_ATTRIBUTES (expr), ref_p);
- stream_write_tree (ob, DECL_ABSTRACT_ORIGIN (expr), ref_p);
+
+ /* On non-early-LTO enabled targets we claim we compiled with -g0
+ but dwarf2out still did its set_decl_origin_self game fooling
+ itself late. Und that here since we won't have access to the
+ early generated abstract DIEs. */
+ tree ao = DECL_ABSTRACT_ORIGIN (expr);
+ if (debug_info_level == DINFO_LEVEL_NONE
+ && ao == expr)
+ ao = NULL_TREE;
+ stream_write_tree (ob, ao, ref_p);
if ((VAR_P (expr) || TREE_CODE (expr) == PARM_DECL)
&& DECL_HAS_VALUE_EXPR_P (expr))
which fixes the testcase at least.
>From gcc-bugs-return-630652-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:24:53 2019
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Subject: [Bug libstdc++/89023] libstdc++ test failure; can't find omp.h with --disable-libgomp
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to sandra from comment #0)
> Is there some reason this test is conditionalized differently than, say,
> 28_regex/headers/regex/parallel_mode.cc ?? That one is properly recognized
> as unsupported on this target.
That's the same header :-)
I think it should probably be the same as
25_algorithms/headers/algorithm/algorithm_parallel_mode.cc i.e.
// { dg-require-parallel-mode "" }
// { dg-options "-D_GLIBCXX_PARALLEL -fopenmp" { target *-*-* } }
(Although that will mean it almost never gets tested, as nobody runs make
check-parallel routinely ... not that it really matters, as nobody uses
parallel mode either, and it will be deprecated soon).
> Also, the underlying failure seems related to pr35887. Why is libstdc++
> even installing headers that depend on omp.h with --disable-libgomp?
Probably because it was easier that way. They only depend on omp.h if you
explicitly request it by defining _GLIBCXX_PARALLEL, and if you do that without
libgomp that's your fault. The test that does that needs to be fixed.
>From gcc-bugs-return-630653-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:25:45 2019
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Subject: [Bug c++/89025] Wrong point of declaration for enumeration names
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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>From gcc-bugs-return-630654-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:31:49 2019
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Subject: [Bug c++/89029] __builtin_constant_p erroneously true
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Peter Dimov from comment #0)
> (This is simplified from an attempt to create a statically-diagnosed assert
> facility that would warn when the asserted expression is known to be false:
> https://godbolt.org/z/i5SXSd. Would've been cool if it worked.)
c.f. https://gcc.gnu.org/ml/libstdc++/2018-03/msg00031.html and the replies
>From gcc-bugs-return-630655-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:33:08 2019
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Subject: [Bug web/89032] Missing documentation for GCC 7.4.0
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Please add missing CSS file for it, take a look here:
https://gcc.gnu.org/onlinedocs/7.3.0/
>From gcc-bugs-return-630657-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:42:37 2019
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Subject: [Bug middle-end/26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
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Bug 26163 depends on bug 87214, which changed state.
Bug 87214 Summary: [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87214
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Assignee|rsandifo at gcc dot gnu.org |marxin at gcc dot gnu.org
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Well, omnetpp_r has no known portability issues:
https://www.spec.org/cpu2017/Docs/benchmarks/520.omnetpp_r.html
So that I would like to know what violates the aliasing. Let me debug that..
>From gcc-bugs-return-630658-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:43:17 2019
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Subject: [Bug fortran/89033] New: gfortran accepts invalid code in select type construct with pointer assignment
Date: Thu, 24 Jan 2019 10:43:00 -0000
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Bug ID: 89033
Summary: gfortran accepts invalid code in select type construct
with pointer assignment
Product: gcc
Version: 9.0
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Severity: normal
Priority: P3
Component: fortran
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The code below should be invalid, as the selector x has attribute "target" but
not "pointer" inside the select type block (2008 draft, 8.1.3.3). The code
compiles, but it gives a suprising output, namely x is still associated,
despite the accepted "x => null()" line.
program select_type_ptr
implicit none
type t
integer :: i = 1
end type t
class(*), pointer :: x
type(t), pointer :: y
allocate(x, source = t(3))
select type (x)
type is (t)
y => x
x => null()
end select
print *, associated(x), associated(y)
print *, y%i
end program select_type_ptr
>From gcc-bugs-return-630659-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:48:50 2019
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code,
| |rejects-valid
Last reconfirmed|2013-03-17 00:00:00 |2019-1-24
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This was rejects-valid in GCC 4.9 but since GCC 5 is ice-on-valid-code
>From gcc-bugs-return-630660-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:51:47 2019
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 10:51:00 -0000
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--- Comment #7 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 24 Jan 2019, marxin at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87214
>
> Martin Liška <marxin at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> Status|RESOLVED |ASSIGNED
> Resolution|INVALID |---
> Assignee|rsandifo at gcc dot gnu.org |marxin at gcc dot gnu.org
>
> --- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
> Well, omnetpp_r has no known portability issues:
> https://www.spec.org/cpu2017/Docs/benchmarks/520.omnetpp_r.html
>
> So that I would like to know what violates the aliasing. Let me debug that..
A lot of benchmarks end up using spec_qsort...
>From gcc-bugs-return-630663-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:52:17 2019
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Subject: [Bug c++/65608] [meta-bug] friend issues
Date: Thu, 24 Jan 2019 10:52:00 -0000
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Bug 65608 depends on bug 56820, which changed state.
Bug 56820 Summary: elaborated-type-specifier friend incorrectly looked up beyond innermost enclosing namespace
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56820
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
>From gcc-bugs-return-630662-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:52:17 2019
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Subject: [Bug c++/59930] template friend declarations, namespaces, and explicit instantiations don't mix
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |wd11 at leicester dot ac.uk
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 56820 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630661-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:52:09 2019
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Subject: [Bug c++/56820] elaborated-type-specifier friend incorrectly looked up beyond innermost enclosing namespace
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed by Nathan's patch for PR 59930, and looks like a dup of it.
*** This bug has been marked as a duplicate of bug 59930 ***
>From gcc-bugs-return-630664-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 10:54:36 2019
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Subject: [Bug c++/21146] unable to resolve visible symbol
Date: Thu, 24 Jan 2019 10:54:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
EDG still accepts this, but Clang doesn't:
21146.cc:13:18: error: member 'S' found in multiple base classes of different
types
friend class A<S>;
^
21146.cc:7:8: note: member found by ambiguous name lookup
struct S {};
^
21146.cc:4:13: note: member found by ambiguous name lookup
typedef T S;
^
21146.cc:13:18: error: member 'S' found in multiple base classes of different
types
friend class A<S>;
^
21146.cc:7:8: note: member found by ambiguous name lookup
struct S {};
^
21146.cc:4:13: note: member found by ambiguous name lookup
typedef T S;
^
2 errors generated.
I think GCC and Clang are right here.
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #7)
> On Thu, 24 Jan 2019, marxin at gcc dot gnu.org wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87214
> >
> > Martin Liška <marxin at gcc dot gnu.org> changed:
> >
> > What |Removed |Added
> > ----------------------------------------------------------------------------
> > Status|RESOLVED |ASSIGNED
> > Resolution|INVALID |---
> > Assignee|rsandifo at gcc dot gnu.org |marxin at gcc dot gnu.org
> >
> > --- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
> > Well, omnetpp_r has no known portability issues:
> > https://www.spec.org/cpu2017/Docs/benchmarks/520.omnetpp_r.html
> >
> > So that I would like to know what violates the aliasing. Let me debug that..
>
> A lot of benchmarks end up using spec_qsort...
Ah, yes, I overlooked that as the file has a different suffix:
./benchspec/CPU/520.omnetpp_r/src/simulator/spec_qsort.cc
So let me test it with fixed qsort function.
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Subject: [Bug middle-end/89008] [7/8 Regression] O2 and O1 results differ for simple test
Date: Thu, 24 Jan 2019 11:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89008
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jan 24 11:07:19 2019
New Revision: 268235
URL: https://gcc.gnu.org/viewcvs?rev=268235&root=gcc&view=rev
Log:
2019-01-24 Richard Biener <rguenther@suse.de>
Backport from mainline
2019-01-23 Richard Biener <rguenther@suse.de>
PR tree-optimization/89008
* tree-ssa-reassoc.c (eliminate_using_constants): For * 0 do
not leave another stray operand.
* gcc.dg/torture/pr89008.c: New testcase.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.dg/torture/pr89008.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/tree-ssa-reassoc.c
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Subject: [Bug middle-end/89008] [7/8 Regression] O2 and O1 results differ for simple test
Date: Thu, 24 Jan 2019 11:08:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |7.4.1, 8.2.1
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
"fixed" everywhere, I'm out of the way now, SLSR is still latently buggy (I
suggest to simply "ignore" * 0 stmts)
>From gcc-bugs-return-630668-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 11:14:26 2019
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/89034] New: [libgomp, openacc] dg-shouldfail in abort-1.c allows libgomp asserts to go undetected
Date: Thu, 24 Jan 2019 11:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89034
Bug ID: 89034
Summary: [libgomp, openacc] dg-shouldfail in abort-1.c allows
libgomp asserts to go undetected
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: testsuite
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Reporter: vries at gcc dot gnu.org
Target Milestone: ---
See "[nvptx, openacc, libgomp] Assertion `!s->map->active' failed for
synchronous parallel with abort" ( PR88939 ).
A commit triggered an assert in abort-1.c, but because of dg-shouldfail, the
test-case continued passing. Eventually, it was noticed by manual inspection
of libgomp.log, months after the offending commit was committed to trunk,
instead of during pre-commit testing, which would have been preferable.
If a dg-output-not directive was available, we could improve the abort-1.c
testcase somewhat by adding:
...
/* { dg-output-not "Assertion.*failed" } */
...
or some such.
>From gcc-bugs-return-630669-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 11:18:18 2019
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Subject: [Bug testsuite/89034] [libgomp, openacc] dg-shouldfail in abort-1.c allows libgomp asserts to go undetected
Date: Thu, 24 Jan 2019 11:18:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |openacc
CC| |tschwinge at gcc dot gnu.org
Severity|normal |enhancement
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
This is a rewrite of abort-1.c that gets rid of the dg-shouldfail, by using
on_exit:
...
/* { dg-do run { target { ! openacc_host_selected } } } */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static int trace;
static void
exit_handler (int status, void *arg)
{
if (trace != 1)
abort ();
if (status != EXIT_FAILURE)
abort ();
_exit (0);
}
int
main (void)
{
trace = 0;
on_exit (exit_handler, NULL);
trace++;
#pragma acc parallel
{
abort ();
}
trace++;
return 0;
}
/* { dg-output "libgomp: " } */
...
>From gcc-bugs-return-630670-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 11:20:24 2019
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Subject: [Bug testsuite/89034] [libgomp, openacc] dg-shouldfail in abort-1.c allows libgomp asserts to go undetected
Date: Thu, 24 Jan 2019 11:20:00 -0000
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Thomas,
is this replacement for abort-1.c OK for trunk?
If so, I'll commit this, otherwise, I'll commit this as abort-nvptx.c or some
such.
Thanks
- Tom
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Subject: [Bug debug/89006] [9 Regression] New note: non-delegitimized UNSPEC UNSPEC_SET_GOT (14) found in variable location since r267638
Date: Thu, 24 Jan 2019 11:22:00 -0000
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45518
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45518&action=edit
gcc9-pr89006.patch
Untested fix.
>From gcc-bugs-return-630672-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 11:25:05 2019
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Subject: [Bug c++/89029] __builtin_constant_p erroneously true
Date: Thu, 24 Jan 2019 11:25:00 -0000
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--- Comment #4 from Peter Dimov <pdimov at gmail dot com> ---
(In reply to Jonathan Wakely from comment #3)
> c.f. https://gcc.gnu.org/ml/libstdc++/2018-03/msg00031.html and the replies
Yes, pretty much.
> I doubt we would catch many bugs that way, as most bugs would involve
> non-constant indices and vectors that have changed size dynamically at
> run-time.
It's still pretty cool when it works, f.ex. here: https://godbolt.org/z/fHCB16
Annoying that we're so close to useful static analysis but it doesn't _quite_
work. (Also note how the code for g() goes straight to assert without telling
anyone.)
>RESOLVED INVALID
Too bad. FWIW, Clang trunk doesn't seem to suffer from the false positive
problem. It also "proves" the assertion failure in g, but not in f:
https://godbolt.org/z/92WyvR. (It also doesn't support __attribute((error)),
which makes this technique limited in value.)
Maybe the correct way to go about this is just to mark __assert_fail in some
manner ("warn if unconditionally called"), instead of trying to (ab)use
__builtin_constant_p.
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 11:25:00 -0000
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--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
I guess it's not related to qsort (the files looks different and fine:
#include <cstdlib>
#include "spec_qsort.h"
static void spec_swap(void *x, void *y, size_t l) {
/* Swap elements of an array byte by byte. Note that a version specialized
to
operate on a specific data type (e.g. int) would be faster. */
char *a = (char *)x, *b = (char *)y, c;
while(l--) {
c = *a;
*a++ = *b;
*b++ = c;
}
}
static void spec_sort(char *array, size_t size, int begin, int end, int
(*cmp)(const void*,const void*)) {
/* Generic qsort algorithm */
if (end > begin) {
void *pivot = array + begin;
int l = begin + size;
int r = end;
while(l < r) {
if (cmp(array+l,pivot) <= 0) {
l += size;
} else {
r -= size;
spec_swap(array+l, array+r, size);
}
}
l -= size;
spec_swap(array+begin, array+l, size);
spec_sort(array, size, begin, l, cmp);
spec_sort(array, size, r, end, cmp);
}
}
void spec_qsort(void *array, size_t nitems, size_t size, int (*cmp)(const
void*,const void*)) {
spec_sort((char *)array, size, 0, (nitems-1)*size, cmp);
}
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 11:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87214
--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
Only following 2 LTO object files trigger the segfault:
simulator/cpar.o and simulator/ccomponent.o (rest are -fno-lto object files).
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Subject: [Bug c++/65608] [meta-bug] friend issues
Date: Thu, 24 Jan 2019 11:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65608
Bug 65608 depends on bug 59815, which changed state.
Bug 59815 Summary: Apparently bogus error: 'Outer' is already declared in this scope
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59815
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Subject: [Bug c++/59815] Apparently bogus error: 'Outer' is already declared in this scope
Date: Thu, 24 Jan 2019 11:37:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> I think this is a duplicate of bug 37804.
It's a dup of bug 37804 comment 6 which is actually PR 59930, and fixed.
*** This bug has been marked as a duplicate of bug 59930 ***
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Subject: [Bug c++/59930] template friend declarations, namespaces, and explicit instantiations don't mix
Date: Thu, 24 Jan 2019 11:37:00 -0000
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CC| |ppluzhnikov at google dot com
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 59815 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630680-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 11:40:16 2019
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Subject: [Bug c++/65608] [meta-bug] friend issues
Date: Thu, 24 Jan 2019 11:40:00 -0000
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Bug 65608 depends on bug 60611, which changed state.
Bug 60611 Summary: friend function declaration rejected when the namespace in which it is declared is not explicitely specified in the declaration
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60611
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>From gcc-bugs-return-630678-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 11:40:15 2019
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Subject: [Bug c++/60611] friend function declaration rejected when the namespace in which it is declared is not explicitely specified in the declaration
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This looks like a dup
*** This bug has been marked as a duplicate of bug 57376 ***
>From gcc-bugs-return-630679-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 11:40:15 2019
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Subject: [Bug c++/57376] Bogus error due to failure of unqualified namespace lookup
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CC| |nicolas.bertolotti@mathwork
| |s.fr
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 60611 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630681-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 11:58:05 2019
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Subject: [Bug c++/61327] Problem with friend template object
Date: Thu, 24 Jan 2019 11:58:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for GCC 6 by r227023, which fixed PR 66957.
The examples here look different enough that we should probably add them to the
testsuite before closing this.
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Subject: [Bug c++/65619] friend declaration with template template parameter not recognized
Date: Thu, 24 Jan 2019 12:01:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for GCC 6 by r227023, which fixed PR 66957.
The example here looks different enough that we should probably add it to the
testsuite before closing this.
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Subject: [Bug target/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #25 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Testcase fixed, *vsx_reduc_<VEC_reduc_name>_v4sf_scalar hasn't been disabled
for little endian (is it incorrect too or just non-optimal)?
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Subject: [Bug libstdc++/88999] [9 Regression] testcases using in_avail() fail on nios2-elf
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |jakub at gcc dot gnu.org
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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/88760] GCC unrolling is suboptimal
Date: Thu, 24 Jan 2019 12:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760
--- Comment #17 from ktkachov at gcc dot gnu.org ---
I played around with the source to do some conservative 2x manual unrolling in
the two hottest functions in 510.parest_r (3 more-or-less identical tight FMA
loops). This was to try out Richard's thinking suggestion in #c10 about
unrolling for forming load-pairs, and also to break the accumulator dependency.
So the initial testcase now became:
unsigned int *colnums;
double *val;
struct foostruct
{
unsigned int rows;
unsigned int *colnums;
unsigned int *rowstart;
};
struct foostruct *cols;
void
foo (double * __restrict__ dst, const double *__restrict__ src)
{
const unsigned int n_rows = cols->rows;
const double *val_ptr = &val[cols->rowstart[0]];
const unsigned int *colnum_ptr = &cols->colnums[cols->rowstart[0]];
double *dst_ptr = dst;
for (unsigned int row=0; row<n_rows; ++row)
{
double s = 0.;
const double *const val_end_of_row = &val[cols->rowstart[row+1]];
__PTRDIFF_TYPE__ diff = val_end_of_row - val_ptr;
if (diff & 1) // Peel the odd iteration.
s += *val_ptr++ * src[*colnum_ptr++];
double s1 = 0.; // Second accumulator
while (val_ptr != val_end_of_row)
{
s += val_ptr[0] * src[colnum_ptr[0]];
s1 += val_ptr[1] * src[colnum_ptr[1]];
val_ptr += 2;
colnum_ptr += 2;
}
*dst_ptr++ = s + s1;
}
}
This transformed the initial loop from:
.L4:
ldr w3, [x7, x2, lsl 2]
cmp x6, x2
ldr d2, [x5, x2, lsl 3]
add x2, x2, 1
ldr d1, [x1, x3, lsl 3]
fmadd d0, d2, d1, d0
bne .L4
into:
.L5:
ldp w6, w5, [x3] // LDP
add x3, x3, 8
ldp d5, d3, [x2] // LDP
add x2, x2, 16
ldr d4, [x1, x6, lsl 3]
cmp x4, x2
ldr d2, [x1, x5, lsl 3]
fmadd d0, d5, d4, d0
fmadd d1, d3, d2, d1
bne .L5
In parest itself a few of the loops transformed this way did not form LDPs due
to unrelated LDP-forming inefficiencies but the most did.
This transformation gave a 3% improvement on a Cortex-A72. There are more
similar loops in the 3rd, 4th and 5th hottest functions in that benchmark, so I
suspect if we do something intelligent there as well we'll get even more
sizeable gains.
So rather than solving general "unrolling", how about we break this down into
two desirable transformations:
1) Unrolling for load-pair-forming vectorisation (Richard Sandiford's
suggestion)
2) Unrolling and breaking accumulator dependencies.
I think more general unrolling and the peeling associated with it can be
discussed independently of 1) and 2) once we collect more data on more
microarchitectures.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/88760] GCC unrolling is suboptimal
Date: Thu, 24 Jan 2019 12:29:00 -0000
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--- Comment #18 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 24 Jan 2019, ktkachov at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760
>
> --- Comment #17 from ktkachov at gcc dot gnu.org ---
> I played around with the source to do some conservative 2x manual unrolling in
> the two hottest functions in 510.parest_r (3 more-or-less identical tight FMA
> loops). This was to try out Richard's thinking suggestion in #c10 about
> unrolling for forming load-pairs, and also to break the accumulator dependency.
>
> So the initial testcase now became:
> unsigned int *colnums;
> double *val;
>
> struct foostruct
> {
> unsigned int rows;
> unsigned int *colnums;
> unsigned int *rowstart;
> };
>
> struct foostruct *cols;
>
> void
> foo (double * __restrict__ dst, const double *__restrict__ src)
> {
> const unsigned int n_rows = cols->rows;
> const double *val_ptr = &val[cols->rowstart[0]];
> const unsigned int *colnum_ptr = &cols->colnums[cols->rowstart[0]];
>
> double *dst_ptr = dst;
> for (unsigned int row=0; row<n_rows; ++row)
> {
> double s = 0.;
> const double *const val_end_of_row = &val[cols->rowstart[row+1]];
> __PTRDIFF_TYPE__ diff = val_end_of_row - val_ptr;
>
> if (diff & 1) // Peel the odd iteration.
> s += *val_ptr++ * src[*colnum_ptr++];
>
> double s1 = 0.; // Second accumulator
> while (val_ptr != val_end_of_row)
> {
> s += val_ptr[0] * src[colnum_ptr[0]];
> s1 += val_ptr[1] * src[colnum_ptr[1]];
> val_ptr += 2;
> colnum_ptr += 2;
> }
> *dst_ptr++ = s + s1;
> }
> }
>
> This transformed the initial loop from:
> .L4:
> ldr w3, [x7, x2, lsl 2]
> cmp x6, x2
> ldr d2, [x5, x2, lsl 3]
> add x2, x2, 1
> ldr d1, [x1, x3, lsl 3]
> fmadd d0, d2, d1, d0
> bne .L4
>
> into:
> .L5:
> ldp w6, w5, [x3] // LDP
> add x3, x3, 8
> ldp d5, d3, [x2] // LDP
> add x2, x2, 16
> ldr d4, [x1, x6, lsl 3]
> cmp x4, x2
> ldr d2, [x1, x5, lsl 3]
> fmadd d0, d5, d4, d0
> fmadd d1, d3, d2, d1
> bne .L5
>
> In parest itself a few of the loops transformed this way did not form LDPs due
> to unrelated LDP-forming inefficiencies but the most did.
> This transformation gave a 3% improvement on a Cortex-A72. There are more
> similar loops in the 3rd, 4th and 5th hottest functions in that benchmark, so I
> suspect if we do something intelligent there as well we'll get even more
> sizeable gains.
>
> So rather than solving general "unrolling", how about we break this down into
> two desirable transformations:
> 1) Unrolling for load-pair-forming vectorisation (Richard Sandiford's
> suggestion)
If that helps, sure (I'd have guessed uarchs are going to split
load-multiple into separate loads, but eventually it avoids
load-port contention?)
> 2) Unrolling and breaking accumulator dependencies.
IIRC RTL unrolling can do this (as side-effect, not as main
cost motivation) guarded with an extra switch.
> I think more general unrolling and the peeling associated with it can be
> discussed independently of 1) and 2) once we collect more data on more
> microarchitectures.
I think both of these can be "implemented" on the RTL unroller
side.
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From: "david at westcontrol dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/89035] New: Request - builtins for unspecified and arbitrary values
Date: Thu, 24 Jan 2019 12:32:00 -0000
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Bug ID: 89035
Summary: Request - builtins for unspecified and arbitrary
values
Product: gcc
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Target Milestone: ---
Occasionally it is useful to have an unspecified or arbitrary value in C (and
C++) programming. For example, you might want to have a function that
calculates a particular value for valid inputs, and returns an unspecified
value on invalid inputs.
At the moment, gcc has __builtin_unreachable() to indicate intentional manually
created undefined behaviour - it is useful for getting optimal code, and also
for documenting code. And it provides a reliable way of saying "this can't
happen", unlike other undefined behaviour (such as writing "1/0;").
Unspecified and arbitrary values are different from undefined values - the
compiler is free to pick them in any way it likes, but the values are valid and
non-trapping, and operations using them are defined behaviour, though with
possibly unspecified or arbitrary results.
An unspecified value can be created by making a local variable and leaving it
uninitialised - but that will usually be flagged by a warning from gcc, and it
is not clear in the code. An arbitrary value can be generated by inline
assembly, such as " int x; asm("" : "=r" (x)); " which generates no code.
However, that does not give the compiler freedom to pick a different arbitrary
value of its liking.
I would like to suggest there be builtin functions __builtin_unspecified() and
__builtin_arbitrary(). They would both return an "int" - I don't think there
is need for any other types.
The difference between this can be seen with code like this:
int x = __builtin_arbitrary();
int y = x - x; // y is guaranteed to be 0.
int x = __builtin_unspecified();
int y = x - x; // y is unspecified.
An initial implementation could be very simple.
__builtin_unspecified() can use the existing unspecified value logic in the
compiler, or could be viewed as __builtin_arbitrary().
__builtin_arbitrary() can work like the inline assembly shown above, or just
return 0.
Of course, a better implementation would allow more optimisations - the
compiler could pick different values that result in more efficient code later.
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Subject: [Bug lto/87187] FAIL: gfortran.dg/short_circuiting_3.f90 -g -flto (internal compiler error) on darwin
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk, not sure if it is a regression also present on the branch?
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Subject: [Bug lto/87187] FAIL: gfortran.dg/short_circuiting_3.f90 -g -flto (internal compiler error) on darwin
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jan 24 12:36:14 2019
New Revision: 268236
URL: https://gcc.gnu.org/viewcvs?rev=268236&root=gcc&view=rev
Log:
2019-01-24 Richard Biener <rguenther@suse.de>
PR lto/87187
* tree-streamer-out.c (write_ts_decl_common_tree_pointers):
When in "legacy" debug mode make sure to reset self-origins.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-streamer-out.c
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Subject: [Bug debug/86549] [8/9 Regression] -flto -g0 vs. -g issues
Date: Thu, 24 Jan 2019 12:36:00 -0000
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Bug 86549 depends on bug 87187, which changed state.
Bug 87187 Summary: FAIL: gfortran.dg/short_circuiting_3.f90 -g -flto (internal compiler error) on darwin
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87187
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>From gcc-bugs-return-630691-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 12:41:31 2019
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Subject: [Bug target/89021] Implement mmintrin.h in SSE
Date: Thu, 24 Jan 2019 12:41:00 -0000
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--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Uroš Bizjak from comment #1)
> Porbably we just need to add SSE alternatives to existing MMX builtins. C.f.
> [1].
>
> [1] https://gcc.gnu.org/ml/gcc-patches/2019-01/msg01393.html
Yes, and a few other improvements.
>From gcc-bugs-return-630692-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 12:43:09 2019
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Subject: [Bug target/89021] Implement mmintrin.h in SSE
Date: Thu, 24 Jan 2019 12:43:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Richard Biener from comment #2)
> I think that to avoid surprises -mno-mmx should be the default on x86 and
> thus
> MMX code would need to explicitely supply -mmmx. Would that work around the
> issue or would we see odd errors when using the mm intrinsics?
That sounds right. We can even vectorize
void
foo (char* restrict r, char* restrict a){
for (int i = 0; i < 8; i++){
r[i] += a[i];
}
}
>From gcc-bugs-return-630693-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 12:54:43 2019
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Subject: [Bug c/89035] Request - builtins for unspecified and arbitrary values
Date: Thu, 24 Jan 2019 12:54:00 -0000
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
We already have
int x = x;
for one of those, no? Or just
int x;
but it tends to warn.
>From gcc-bugs-return-630694-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:11:37 2019
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Subject: [Bug c/89035] Request - builtins for unspecified and arbitrary values
Date: Thu, 24 Jan 2019 13:11:00 -0000
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--- Comment #2 from David Brown <david at westcontrol dot com> ---
Yes, "int x = x;" does give an unspecified value without a warning. But to me,
this looks much more like a workaround - while "int x =
__builtin_unspecified();" is clear in its intentions.
>From gcc-bugs-return-630695-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:26:35 2019
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Subject: [Bug c++/88969] [9 Regression] ICE in build_op_delete_call, at cp/call.c:6509
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Mine.
>From gcc-bugs-return-630696-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:27:19 2019
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Subject: [Bug tree-optimization/88760] GCC unrolling is suboptimal
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--- Comment #19 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #18)
> > 1) Unrolling for load-pair-forming vectorisation (Richard Sandiford's
> > suggestion)
>
> If that helps, sure (I'd have guessed uarchs are going to split
> load-multiple into separate loads, but eventually it avoids
> load-port contention?)
Many CPUs execute LDP/STP as a single load/store, eg. Cortex-A57 executes a
128-bit LDP in a single cycle (see Optimization Guide).
> > 2) Unrolling and breaking accumulator dependencies.
>
> IIRC RTL unrolling can do this (as side-effect, not as main
> cost motivation) guarded with an extra switch.
>
> > I think more general unrolling and the peeling associated with it can be
> > discussed independently of 1) and 2) once we collect more data on more
> > microarchitectures.
>
> I think both of these can be "implemented" on the RTL unroller
> side.
You still need dependence analysis, alias info, ivopt to run again. The goal is
to remove the increment of the index, use efficient addressing modes (base+imm)
and allow scheduling to move instructions between iterations. I don't believe
the RTL unroller supports any of this today.
>From gcc-bugs-return-630697-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:29:17 2019
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Subject: [Bug preprocessor/88974] [9 Regression] ICE: Segmentation fault (in linemap_resolve_location)
Date: Thu, 24 Jan 2019 13:29:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45519
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45519&action=edit
gcc9-pr88974.patch
Untested fix. That said, I see no signs why this is a regression.
>From gcc-bugs-return-630698-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:33:01 2019
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Subject: [Bug libfortran/89020] close(status='DELETE') does not remove file
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--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Dominique d'Humieres from comment #2)
> > If virtualbox's shared folders are doing strange things with
> > files or is broken, not much that the gfortran developers
> > can do about that.
>
> Hence closing as WONTFIX?
First, what virtualbox is doing is a violation of common UNIX
semantics, so we would be within our rights :-) to do this.
However, I'd like to look at the code first and check if we
can actually accommodate this strange behavior without pessimizing
anything else. If so, I would be inclined to "fix" this.
On the third hand, I seem to remember that unlink / close also
used to cause (potential?) issues with NFS.
>From gcc-bugs-return-630699-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:39:04 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/88951] [9 Regression] No fpermissive offerred on 'error: jump to case label'
Date: Thu, 24 Jan 2019 13:39:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Your testcase doesn't compile anywhere, you need to add at least a semicolon
after case 0:
With that fixed, whether this was accepted or not changed over time several
times, e.g. 3.2 accepted it with warnings (and -fpermissive in all cases), 3.3
- 4.9 emitted a warning and error, 5.x-8.x gave just a warning or two, 9.x
error + warning.
I'd say just fix the legacy code.
>From gcc-bugs-return-630700-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:41:04 2019
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/88760] GCC unrolling is suboptimal
Date: Thu, 24 Jan 2019 13:41:00 -0000
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--- Comment #20 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 24 Jan 2019, wilco at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760
>
> --- Comment #19 from Wilco <wilco at gcc dot gnu.org> ---
> (In reply to rguenther@suse.de from comment #18)
>
> > > 1) Unrolling for load-pair-forming vectorisation (Richard Sandiford's
> > > suggestion)
> >
> > If that helps, sure (I'd have guessed uarchs are going to split
> > load-multiple into separate loads, but eventually it avoids
> > load-port contention?)
>
> Many CPUs execute LDP/STP as a single load/store, eg. Cortex-A57 executes a
> 128-bit LDP in a single cycle (see Optimization Guide).
>
> > > 2) Unrolling and breaking accumulator dependencies.
> >
> > IIRC RTL unrolling can do this (as side-effect, not as main
> > cost motivation) guarded with an extra switch.
> >
> > > I think more general unrolling and the peeling associated with it can be
> > > discussed independently of 1) and 2) once we collect more data on more
> > > microarchitectures.
> >
> > I think both of these can be "implemented" on the RTL unroller
> > side.
>
> You still need dependence analysis, alias info, ivopt to run again. The goal is
> to remove the increment of the index, use efficient addressing modes (base+imm)
> and allow scheduling to move instructions between iterations. I don't believe
> the RTL unroller supports any of this today.
There's no way to encode load-multiple on GIMPLE that wouldn't be
awkward to other GIMPLE optimizers.
Yes, the RTL unroller supports scheduling (sched runs after unrolling)
and scheduling can do dependence analysis. Yes, the RTL unroller
does _not_ do dependence analysis at the moment, so if you want to
know beforehand whether you can interleave iterations you have to
actually perform dependence analysis. Of course you can do that
on RTL. And of course you can do IVOPTs on RTL (yes, we don't do that
at the moment).
Note I'm not opposed to have IVOPTs on GIMPLE itself perform
unrolling (I know Bin was against this given IVOPTs is already
so comples) and a do accumulator breakup. But I don't see how
to do the load-multiple thing (yes, you could represent it
as a vector load plus N element extracts on GIMPLE and it
would be easy to teach SLP vectorization to perform this
transform on its own if it is really profitable - which I
doubt you can reasonably argue before RA, let alone on GIMPLE).
>From gcc-bugs-return-630701-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:42:00 2019
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Subject: [Bug c++/88988] [8/9 Regression] ICE: Segmentation fault (in lookup_name_real_1)
Date: Thu, 24 Jan 2019 13:41:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This is not valid, if you firstprivatize a nonstatic data member, accessing it
through this is undefined behavior.
>From gcc-bugs-return-630702-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:42:50 2019
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Subject: [Bug middle-end/89008] [7/8 Regression] O2 and O1 results differ for simple test
Date: Thu, 24 Jan 2019 13:42:00 -0000
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--- Comment #12 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Yes, fully agree -- I'll take care of that probably tomorrow. Too many
meetings this week...
>From gcc-bugs-return-630703-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:46:05 2019
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Subject: [Bug target/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
Date: Thu, 24 Jan 2019 13:46:00 -0000
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--- Comment #26 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
I believe it's also incorrect (the assumption on the value being in element 3
is a big-endian statement) but latent because this is really hard to match.
I'll take an internal note to clean this up. I will also look at backporting
these fixes to earlier releases to avoid future rediscovery.
>From gcc-bugs-return-630705-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:51:48 2019
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Subject: [Bug c++/89036] ICE if destructor has a requires
Date: Thu, 24 Jan 2019 13:51:00 -0000
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--- Comment #1 from Antony Polukhin <antoshkka at gmail dot com> ---
Compile with flags: -std=c++2a -fconcepts
>From gcc-bugs-return-630704-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 13:51:14 2019
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Subject: [Bug c++/89036] New: ICE if destructor has a requires
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Bug ID: 89036
Summary: ICE if destructor has a requires
Product: gcc
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The following code:
template<typename T>
struct Y {
~Y() requires(true) = default;
~Y() requires(false) {}
};
causes ICE:
<source>:6:27: internal compiler error: in add_method, at cp/class.c:1137
6 | ~Y() requires(false) {}
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
>From gcc-bugs-return-630706-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:10:39 2019
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
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Created attachment 45520
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45520&action=edit
optimized dump with -mprefer-vector-width=128
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Subject: [Bug middle-end/89037] New: checking ice emitting 128-bit bit-field initializer
Date: Thu, 24 Jan 2019 14:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89037
Bug ID: 89037
Summary: checking ice emitting 128-bit bit-field initializer
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-checking, ice-on-valid-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: rearnsha at gcc dot gnu.org
Target Milestone: ---
Target: aarch64
/* ./cc1 testcase.c */
struct s
{
__int128 y : 65;
};
typedef struct s T;
T a = { 1 };
Results in
besttry.c:7:1: internal compiler error: tree check: accessed elt 2 of
tree_int_cst with 1 elts in output_constructor_bitfield, at varasm.c:5410
7 | T a = { 1 };
| ^
0x5be4f1 tree_int_cst_elt_check_failed(int, int, char const*, int, char const*)
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/tree.c:9999
0x740049 tree_int_cst_elt_check(tree_node*, int, char const*, int, char const*)
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/tree.h:3378
0xf8d530 output_constructor_bitfield
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/varasm.c:5410
0xf8db12 output_constructor
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/varasm.c:5524
0xf8c27f output_constant
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/varasm.c:5037
0xf81a96 assemble_variable_contents
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/varasm.c:2144
0xf82519 assemble_variable(tree_node*, int, int, int)
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/varasm.c:2323
0xfa03c4 varpool_node::assemble_decl()
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/varpool.c:586
0x7ac56c output_in_order
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/cgraphunit.c:2443
0x7ac56c symbol_table::compile()
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/cgraphunit.c:2683
0x7aef96 symbol_table::compile()
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/cgraphunit.c:2865
0x7aef96 symbol_table::finalize_compilation_unit()
/home/rearnsha/gnusrc/gcc-cross/trunk/gcc/cgraphunit.c:2862
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 14:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87214
--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 45521
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45521&action=edit
optimized dump with -mprefer-vector-width=256
>From gcc-bugs-return-630709-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:13:50 2019
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 14:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87214
--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
The 2 problematic functions looks like:
void cComponent::reallocParamv(int size)
{
((void)0);
if (size!=(short)size)
throw cRuntimeError(this, "reallocParamv(%d): at most %d parameters
allowed", size, 0x7fff);
cPar *newparamv = new cPar[size];
__builtin_printf ("realloc called with new size: paramvsize: %d\n", numparams);
for (int i=0; i<numparams; i++)
__builtin_printf ("%d:%s\n", i,paramv[i].getName());
__builtin_printf ("\n");
for (int i=0; i<numparams; i++)
paramv[i].moveto(newparamv[i]);
for (int i=0; i<numparams; i++)
__builtin_printf ("%d:%s\n", i,newparamv[i].getName());
__builtin_printf ("realloc done\n");
delete [] paramv;
paramv = newparamv;
paramvsize = (short)size;
}
void cComponent::addPar(cParImpl *value)
{
__builtin_printf ("addPar: paramvsize: %d, name: %s\n", paramvsize,
value->getName());
if (parametersFinalized())
throw cRuntimeError(this, "cannot add parameters at runtime");
if (findPar(value->getName())>=0)
throw cRuntimeError(this, "cannot add parameter `%s': already exists",
value->getName());
if (numparams==paramvsize)
reallocParamv(paramvsize+1);
paramv[numparams++].init(this, value);
}
where the vectorized version prints:
Preparing for running configuration General, run #0...
Scenario: $repetition=0
Assigned runID=speccpu-runid
Setting up network `largeNet'...
addPar: paramvsize: 0, name: n
findPar: n
realloc called with new size: paramvsize: 0
realloc done
findPar: n
addPar: paramvsize: 1, name: bbs
findPar: bbs
realloc called with new size: paramvsize: 1
0:n
0:n
realloc done
findPar: bbs
addPar: paramvsize: 2, name: bbm
findPar: bbm
realloc called with new size: paramvsize: 2
0:n
1:bbs
0:n
1:bbs
realloc done
findPar: bbm
addPar: paramvsize: 3, name: bbl
findPar: bbl
realloc called with new size: paramvsize: 3
0:n
1:bbs
2:bbm
0:n
1:bbs
2:bbm
realloc done
findPar: bbl
addPar: paramvsize: 4, name: as
findPar: as
realloc called with new size: paramvsize: 4
0:n
1:bbs
2:bbm
3:bbl
0:n
1:bbs
2:bbm
3:bbl
realloc done
findPar: as
addPar: paramvsize: 5, name: am
findPar: am
realloc called with new size: paramvsize: 5
0:n
1:bbs
2:bbm
3:bbl
4:as
0:n
1:bbs
2:bbm
3:bbl
4:as
realloc done
findPar: am
addPar: paramvsize: 6, name: al
findPar: al
realloc called with new size: paramvsize: 6
0:n
1:bbs
2:bbm
3:bbl
4:as
5:am
0:n
1:bbs
2:bbm
3:largeNet
4:as
5:am
realloc done
findPar: al
addPar: paramvsize: 7, name: bs
findPar: bs
realloc called with new size: paramvsize: 7
0:n
1:bbs
2:bbm
3:largeNet
4:as
5:am
6:al
0:n
1:bbs
2:bbm
Segmentation fault (core dumped)
As seen the moveto is wrong for paramvsize == 6 (5 old elements), where element
#3 should be 'bbl' after copying, but is 'largeNet'. Then we reach a segfault
due to it.
>From gcc-bugs-return-630710-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:14:42 2019
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 14:14:00 -0000
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--- Comment #14 from Martin Liška <marxin at gcc dot gnu.org> ---
and moveto does:
void cPar::moveto(cPar& other)
{
other.ownercomponent = ownercomponent;
other.p = p;
p =
# 62 "simulator/cpar.cc" 3 4
__null
# 62 "simulator/cpar.cc"
;
}
>From gcc-bugs-return-630711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:18:27 2019
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Subject: [Bug tree-optimization/88760] GCC unrolling is suboptimal
Date: Thu, 24 Jan 2019 14:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760
--- Comment #21 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #20)
> On Thu, 24 Jan 2019, wilco at gcc dot gnu.org wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760
> >
> > --- Comment #19 from Wilco <wilco at gcc dot gnu.org> ---
> > (In reply to rguenther@suse.de from comment #18)
> >
> > > > 1) Unrolling for load-pair-forming vectorisation (Richard Sandiford's
> > > > suggestion)
> > >
> > > If that helps, sure (I'd have guessed uarchs are going to split
> > > load-multiple into separate loads, but eventually it avoids
> > > load-port contention?)
> >
> > Many CPUs execute LDP/STP as a single load/store, eg. Cortex-A57 executes a
> > 128-bit LDP in a single cycle (see Optimization Guide).
> >
> > > > 2) Unrolling and breaking accumulator dependencies.
> > >
> > > IIRC RTL unrolling can do this (as side-effect, not as main
> > > cost motivation) guarded with an extra switch.
> > >
> > > > I think more general unrolling and the peeling associated with it can be
> > > > discussed independently of 1) and 2) once we collect more data on more
> > > > microarchitectures.
> > >
> > > I think both of these can be "implemented" on the RTL unroller
> > > side.
> >
> > You still need dependence analysis, alias info, ivopt to run again. The goal is
> > to remove the increment of the index, use efficient addressing modes (base+imm)
> > and allow scheduling to move instructions between iterations. I don't believe
> > the RTL unroller supports any of this today.
>
> There's no way to encode load-multiple on GIMPLE that wouldn't be
> awkward to other GIMPLE optimizers.
I don't think anyone want LDP/STP directly in GIMPLE - that doesn't seem
useful. We don't even form LDP until quite late in RTL. The key to forming
LDP/STP is using base+imm addressing modes and having correct alias info (so
loads/stores from different iterations can be interleaved and then combined
into LDP/STP). The main thing a backend would need to do is tune address costs
to take future LDP formation into account (and yes, the existing cost models
need to be improved anyway).
> Yes, the RTL unroller supports scheduling (sched runs after unrolling)
> and scheduling can do dependence analysis. Yes, the RTL unroller
> does _not_ do dependence analysis at the moment, so if you want to
> know beforehand whether you can interleave iterations you have to
> actually perform dependence analysis. Of course you can do that
> on RTL. And of course you can do IVOPTs on RTL (yes, we don't do that
> at the moment).
Sure we *could* duplicate all high-level loop optimizations to work on RTL.
However is that worth the effort given we have them already at tree level?
> Note I'm not opposed to have IVOPTs on GIMPLE itself perform
> unrolling (I know Bin was against this given IVOPTs is already
> so comples) and a do accumulator breakup. But I don't see how
> to do the load-multiple thing (yes, you could represent it
> as a vector load plus N element extracts on GIMPLE and it
> would be easy to teach SLP vectorization to perform this
> transform on its own if it is really profitable - which I
> doubt you can reasonably argue before RA, let alone on GIMPLE).
Let's forget about load-multiple in GIMPLE. Kyrill's example shows that
unrolling at the high level means the existing loop optimizations and analysis
work as expected and we end up with good addressing modes, LDPs and
interleaving of different iterations. With the existing RTL unroller this just
isn't happening.
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 14:19:00 -0000
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--- Comment #15 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 45522
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45522&action=edit
vectorizer dump
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
Date: Thu, 24 Jan 2019 14:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88739
--- Comment #43 from Richard Biener <rguenth at gcc dot gnu.org> ---
So to get back to this - my thinking was that for a reference REF I can do
base = get_inner_reference (ref, &bitsize, &bitpos, &offset, &mode,
&unsignedp, &reversep, &volatilep);
and get the semantically same REF building
REF' = BIT_FIELD_REF<*(&base + offset), bitsize, bitpos>
(plus setting REF_REVERSE_STORAGE_ORDER and TREE_THIS_VOLATILE on REF').
This appearantly breaks down (similarly for get_ref_base_and_extent) for
bigendian and DECL_BIT_FIELD outer COMPONENT_REFs. And maybe for more?
Is my expectation that the above "works" flawed? So "bit position"
and "position of the first referenced bit" are two separate things?
get_inner_reference will basically simply funnel through arguments so
any fix to get_inner_reference/get_ref_base_and_extent will be broken
since we'll apply it "recursively" when iterating the above
BIT_FIELD_REF building. This means it is RTL expansion that is wrong
which means my comment#31 fix is correct? Because the issue is not
the bit position but how we interpret the underlying object?
>From gcc-bugs-return-630714-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:36:57 2019
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
Date: Thu, 24 Jan 2019 14:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88739
--- Comment #44 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 45523
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45523&action=edit
workaround
So I am testing the following workaround, at least "most suitable" for
branches.
It avoids generating affected BIT_FIELD_REFs (with bases with integral types
that have a precision not matching the size of the mode).
Can arm folks please test this patch and aid me (provide) a dg-torture
testcase that currently fails?
It builds OK on x86_64-linux, I'll test it with the endianess test commented
out to see if there's any testsuite fallout.
Thanks.
>From gcc-bugs-return-630715-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:37:37 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/88840] [9 Regression] std::allocator::construct signature might be ill-formed now
Date: Thu, 24 Jan 2019 14:37:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The following program no longer compiles with clang:
#include <vector>
struct Something
{
std::vector<Something> member;
};
int main() {}
It produces the following error:
In file included from t.cpp:1:
In file included from
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/vector:60:
In file included from
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_algobase.h:64:
In file included from
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_pair.h:59:
In file included from
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/move.h:55:
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/type_traits:667:38:
error: incomplete type 'Something' used in type trait expression
: public integral_constant<bool, __is_trivial(_Tp)>
^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_uninitialized.h:901:7:
note: in instantiation of template class 'std::is_trivial<Something>' requested
here
: is_trivial<_Tp> { };
^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_uninitialized.h:904:31:
note: in instantiation of template class
'std::__is_trivially_relocatable<Something, void>' requested here
inline __enable_if_t<std::__is_trivially_relocatable<_Tp>::value, _Tp*>
^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_uninitialized.h:940:23:
note: while substituting deduced template arguments into function template
'__relocate_a_1'
[with _Tp = Something, _Up = Something]
noexcept(noexcept(__relocate_a_1(std::__niter_base(__first),
^
/usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/bits/stl_vector.h:428:11:
note: in instantiation of exception specification for
'__relocate_a<Something *, Something *, std::allocator<Something> >'
requested here
noexcept(std::__relocate_a(std::declval<pointer>(),
^
t.cpp:5:26: note: in instantiation of template class 'std::vector<Something,
std::allocator<Something> >' requested here
std::vector<Something> member;
^
t.cpp:3:8: note: definition of 'Something' is not complete until the closing
'}'
struct Something
^
And two more similar errors. We need to support incomplete types, so we need to
delay the evaluation of __relocatable until it's needed.
>From gcc-bugs-return-630717-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:46:30 2019
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Subject: [Bug middle-end/89037] checking ice emitting 128-bit bit-field initializer
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
And on x86_64-linux as well. I guess we should use extract_uhwi instead
of TREE_INT_CST_ELT. Oddly enough I need to resort to a widest_int here...
(and more than this single place uses TREE_INT_CST_ELT).
Index: varasm.c
===================================================================
--- varasm.c (revision 268010)
+++ varasm.c (working copy)
@@ -5407,7 +5407,8 @@ output_constructor_bitfield (oc_local_st
= HOST_BITS_PER_WIDE_INT - (shift & (HOST_BITS_PER_WIDE_INT -
1));
/* Now get the bits from the appropriate constant word. */
- value = TREE_INT_CST_ELT (local->val, shift /
HOST_BITS_PER_WIDE_INT);
+ value = wi::extract_uhwi (wi::to_widest (local->val),
+ shift, HOST_BITS_PER_WIDE_INT);
shift = shift & (HOST_BITS_PER_WIDE_INT - 1);
/* Get the result. This works only when:
>From gcc-bugs-return-630716-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:46:18 2019
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Subject: [Bug preprocessor/89038] New: #pragma GCC diagnostic ignored "-Wunknown-pragmas" does not work
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Bug ID: 89038
Summary: #pragma GCC diagnostic ignored "-Wunknown-pragmas"
does not work
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Consider this test.cxx file:
-------------------------------8<--------------------------------
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpragmas"
#pragma GCC diagnostic ignored "-Wunknown-pragmas"
// this gets silenced correctly (by line 2)
#pragma GCC diagnostic ignored "-Wfoobar-unknown-gcc-pragma"
// this still emits "-Wunknown-pragmas", despite line 3
#pragma clang diagnostic ignored "-Wfoobar-unknown-clang-pragma"
int main() {}
#pragma GCC diagnostic pop
-------------------------------8<--------------------------------
g++ -Wall -Werror test.cxx
test.cxx:9:0: error: ignoring #pragma clang diagnostic
[-Werror=unknown-pragmas]
#pragma clang diagnostic ignored "-Wfoobar-unknown-clang-pragma"
This happens despite the fact that "-Wunknown-pragmas" is explicitly silenced
in line 3.
Adding -Wno-unknown-pragmas to the command line works as expected; however, I
expect the in-source #pragma to work as well. But it doesn't.
g++ (GCC) 7.2.1 20180104 (Red Hat 7.2.1-5)
Bug #53431 seems closely related.
>From gcc-bugs-return-630718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:46:57 2019
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Subject: [Bug middle-end/89037] checking ice emitting 128-bit bit-field initializer
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rsandifo at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Richard, can you have a look?
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Subject: [Bug libstdc++/88888] Cannot construct filesystem::path from variable length array
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>From gcc-bugs-return-630720-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 14:53:48 2019
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Subject: [Bug libstdc++/88840] [9 Regression] std::allocator::construct signature might be ill-formed now
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--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> And two more similar errors. We need to support incomplete types, so we need
> to delay the evaluation of __relocatable until it's needed.
Sorry, I forgot about this. At some point I was thinking of having a macro that
defines __use_relocate, that we could use in the 3 functions that query it (it
doesn't duplicate the code so we can still update the criterion in a single
place). Or maybe hiding it in a constexpr static function __use_relocate()
would be sufficient, that would look nicer.
>From gcc-bugs-return-630721-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 15:07:02 2019
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Subject: [Bug fortran/89039] New: Logical read from stream file that is neither 0 nor 1
Date: Thu, 24 Jan 2019 15:07:00 -0000
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Bug ID: 89039
Summary: Logical read from stream file that is neither 0 nor 1
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
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Related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22495
Logicals read from an unformatted stream file that are neither 0 nor 1 behave
like this:
print *, b, .not. b
T T
i.e., both they and their negations evaluate to .true.
This reduces portability of stream files. For example, ifort uses -1 as .true.,
but when such stream files are read by gfortran, the nonzero value is not
converted to gfortran's .true.
(Maybe there is nothing that requires it, I don't know.)
>From gcc-bugs-return-630722-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 15:23:27 2019
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Subject: [Bug lto/88140] [9/10 Regression] ICE: verify_gimple failed since r266325
Date: Thu, 24 Jan 2019 15:23:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |deferred
Priority|P1 |P2
Target Milestone|9.0 |10.0
Summary|[9 Regression] ICE: |[9/10 Regression] ICE:
|verify_gimple failed since |verify_gimple failed since
|r266325 |r266325
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/89039] Logical read from stream file that is neither 0 nor 1
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #1 from kargl at gcc dot gnu.org ---
(In reply to Jakub Benda from comment #0)
> Related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22495
>
> Logicals read from an unformatted stream file that are neither 0 nor 1
> behave like this:
>
> print *, b, .not. b
>
> T T
>
> i.e., both they and their negations evaluate to .true.
>
> This reduces portability of stream files. For example, ifort uses -1 as
> .true., but when such stream files are read by gfortran, the nonzero value
> is not converted to gfortran's .true.
>
> (Maybe there is nothing that requires it, I don't know.)
gfortran's behavior is documented in its accompanying manual:
***************
5.2 Internal representation of LOGICAL variables
================================================
The Fortran standard does not specify how variables of 'LOGICAL' type
are represented, beyond requiring that 'LOGICAL' variables of default
kind have the same storage size as default 'INTEGER' and 'REAL'
variables. The GNU Fortran internal representation is as follows.
A 'LOGICAL(KIND=N)' variable is represented as an 'INTEGER(KIND=N)'
variable, however, with only two permissible values: '1' for '.TRUE.'
and '0' for '.FALSE.'. Any other integer value results in undefined
behavior.
****************
If you want a payload in a variable, I suggest you use an INTEGER type.
Also, this seems to have been addressed by Intel.
https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/529134
I inclined to close this as either INVALID or WONTFIX.
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Subject: [Bug c++/87935] [9 regression] new failures on arm since r265788
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from Jason Merrill <jason at gcc dot gnu.org> ---
Looks like these are all fixed now.
>From gcc-bugs-return-630724-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 15:38:03 2019
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Subject: [Bug libfortran/89020] close(status='DELETE') does not remove file
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--- Comment #4 from Luke Robison <robison at arlut dot utexas.edu> ---
> First, what virtualbox is doing is a violation of common UNIX
> semantics, so we would be within our rights :-) to do this.
Agreed. This is definitely outside of the norm for a unix
filesystem. I just tried this program on windows native
with mingw-64's gfortran, and the file is deleted as expected.
I don't know enough about mingw-64 to know if they've rewritten
that part of the library, or how they translate those system
calls.
> On the third hand, I seem to remember that unlink / close also
> used to cause (potential?) issues with NFS.
I haven't experienced this yet, although I've been using primarily
lustre network mounts, not NFS.
> Work around for virtualbox might be
> call execute_command_line("rm -f " // filename)
I'm using the (GNU Extension) unlink() function as my work-around.
It isn't strictly Fortran2008, but it is supported by both gfortran
and ifort, so it's good enough for me. (I sure appreciate some of
those highly-compatible extensions, they make my life easier!)
>From gcc-bugs-return-630726-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 15:40:03 2019
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Subject: [Bug libstdc++/88840] [9 Regression] std::allocator::construct signature might be ill-formed now
Date: Thu, 24 Jan 2019 15:40:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Jan 24 15:39:25 2019
New Revision: 268239
URL: https://gcc.gnu.org/viewcvs?rev=268239&root=gcc&view=rev
Log:
PR libstdc++/88840 delay evaluation of constant until type is complete
Clang fails to compile std::vector<Incomplete> because the static member
__use_relocate cannot be evaluated for an incomplete type. Replace with
a static member function that will not be odr-used until needed, by
which point the type must be complete.
PR libstdc++/88840
* include/bits/stl_vector.h (vector::__use_relocate): Replace static
data member with static member function _S_use_relocate().
* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
(vector::_M_default_append): Use _S_use_relocate() instead of
__use_relocate.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/stl_vector.h
trunk/libstdc++-v3/include/bits/vector.tcc
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Subject: [Bug target/89040] New: Wrong code with -mno-mmx
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Bug ID: 89040
Summary: Wrong code with -mno-mmx
Product: gcc
Version: 9.0
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CC: ubizjak at gmail dot com
Target Milestone: ---
Target: x86-64
[hjl@gnu-cfl-1 gcc]$ cat /tmp/3.i
typedef int __m64 __attribute__ ((__vector_size__ (8), __may_alias__));
typedef int __m64_u __attribute__ ((__vector_size__ (8), __may_alias__,
__aligned__ (1)));
typedef int __v2si __attribute__ ((__vector_size__ (8)));
typedef short __v4hi __attribute__ ((__vector_size__ (8)));
typedef char __v8qi __attribute__ ((__vector_size__ (8)));
typedef long long __v1di __attribute__ ((__vector_size__ (8)));
typedef float __v2sf __attribute__ ((__vector_size__ (8)));
int
foo3b (__m64 __i)
{
return ((__v2si)__i)[0];
}
[hjl@gnu-cfl-1 gcc]$ ./xgcc -B./ -S -O2 /tmp/3.i -mno-mmx
[hjl@gnu-cfl-1 gcc]$ cat 3.s
.file "3.i"
.text
.p2align 4
.globl foo3b
.type foo3b, @function
foo3b:
.LFB0:
.cfi_startproc
movq %xmm0, %rax <<<<<<<< This should be "movd %xmm0, %eax".
ret
.cfi_endproc
.LFE0:
.size foo3b, .-foo3b
.ident "GCC: (GNU) 9.0.1 20190123 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-1 gcc]$
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Subject: [Bug fortran/89039] Logical read from stream file that is neither 0 nor 1
Date: Thu, 24 Jan 2019 15:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89039
--- Comment #2 from Jakub Benda <albandil at atlas dot cz> ---
The quotation from the manual
> Any other integer value results in undefined behavior.
is very explicit. Also, I see that using
ifort -fpscomp logicals
will make ifort compatible with the rest of the world in this regard, so I
agree that the proper flag for this report is INVALID.
Thanks!
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Subject: [Bug libstdc++/88840] [9 Regression] std::allocator::construct signature might be ill-formed now
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88840
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/88840] [9 Regression] std::allocator::construct signature might be ill-formed now
Date: Thu, 24 Jan 2019 15:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88840
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #5)
> Or maybe hiding it in a constexpr static function
> __use_relocate() would be sufficient, that would look nicer.
Yup, that's what I went with.
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
I slightly renamed the functions to have it more readable:
$ cat pr89009.c
void foo();
struct S1 { static void bar(); };
struct __attribute__ ((visibility("default"))) S2: S1 { static void bar(); };
struct S3: S1 { static void bar(); };
struct S4: S3 { static void bar(); };
void S2::bar() { S1::bar(); }
void S3::bar() { S1::bar(); }
void S4::bar() {
foo();
S3::bar(); // MISSING
}
Now ICF does following folding:
Equals called for: static void S3::bar()/1:static void S2::bar()/0 with result:
true
and new localalias is added:
_ZN2S23barEv.localalias/5 (static void S2::_ZN2S23barEv.localalias())
@0x7ffff6b559d8
Type: function definition analyzed alias
Visibility: visibility_specified
References: _ZN2S23barEv/0 (alias)
Referring:
Availability: available
Function flags: icf_merged
Called by: static void S3::bar()/1 (1073741824 (estimated locally),1.00 per
call) (can throw external)
Calls:
and I see the call in S4::f2 is removed here:
pr89009.c.103t.dce2:
;; Function S4::bar (_ZN2S43barEv, funcdef_no=2, decl_uid=2311, cgraph_uid=3,
symbol_order=2)
Marking useful stmt: foo ();
Marking useful stmt: return;
Processing worklist:
processing: return;
processing: foo ();
Eliminating unnecessary statements:
Deleting : S3::bar ();
Removed 1 of 3 statements (33%)
Removed 0 of 0 PHI nodes (0%)
S4::bar ()
{
<bb 2> [local count: 1073741824]:
foo ();
return;
}
Richi do you have any idea what?
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Subject: [Bug libstdc++/88840] [9 Regression] std::allocator::construct signature might be ill-formed now
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--- Comment #9 from Marc Glisse <glisse at gcc dot gnu.org> ---
Thank you for handling it.
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Subject: [Bug target/89040] Wrong code with -mno-mmx
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--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Before reload:
(insn 14 4 2 2 (set (reg:V2SI 86)
(reg:V2SI 20 xmm0 [ __i ])) "x.i":6:1 1090 {*movv2si_internal}
(expr_list:REG_DEAD (reg:V2SI 20 xmm0 [ __i ])
(nil)))
(note 2 14 3 2 NOTE_INSN_DELETED)
(note 3 2 6 2 NOTE_INSN_FUNCTION_BEG)
(insn 6 3 11 2 (set (reg:DI 85 [ __i ])
(subreg:DI (reg:V2SI 86) 0)) "x.i":7:23 66 {*movdi_internal}
(expr_list:REG_DEAD (reg:V2SI 86)
(nil)))
(insn 11 6 12 2 (set (reg/i:SI 0 ax)
(subreg:SI (reg:DI 85 [ __i ]) 0)) "x.i":8:1 67 {*movsi_internal}
(expr_list:REG_DEAD (reg:DI 85 [ __i ])
(nil)))
(insn 12 11 0 2 (use (reg/i:SI 0 ax)) "x.i":8:1 -1
(nil))
After reload:
(insn 6 3 12 2 (set (reg:DI 0 ax [orig:85 __i ] [85])
(reg:DI 20 xmm0 [86])) "x.i":7:23 66 {*movdi_internal}
(nil))
(insn 12 6 15 2 (use (reg/i:SI 0 ax)) "x.i":8:1 -1
(nil))
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
Date: Thu, 24 Jan 2019 16:06:00 -0000
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--- Comment #45 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> So to get back to this - my thinking was that for a reference REF I can do
>
> base = get_inner_reference (ref, &bitsize, &bitpos, &offset, &mode,
> &unsignedp, &reversep, &volatilep);
>
> and get the semantically same REF building
>
> REF' = BIT_FIELD_REF<*(&base + offset), bitsize, bitpos>
>
> (plus setting REF_REVERSE_STORAGE_ORDER and TREE_THIS_VOLATILE on REF').
>
> This appearantly breaks down (similarly for get_ref_base_and_extent) for
> bigendian and DECL_BIT_FIELD outer COMPONENT_REFs. And maybe for more?
>
> Is my expectation that the above "works" flawed? So "bit position"
> and "position of the first referenced bit" are two separate things?
No, they are the same, but I think that BIT_FIELD_REF is not supposed to be
itself applied to a bit-field, as in the case at hand, since it's precisely
meant to designate a bit-field. In other words, the above base cannot be a
bit-field.
So the safest route is probably to forbid such an abomination, i.e. to make
sure that the first argument of BIT_FIELD_REF is a bona-fide base type.
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Subject: [Bug target/88469] [7/8 regression] AAPCS - Struct with 64-bit bitfield may be passed in wrong registers
Date: Thu, 24 Jan 2019 16:07:00 -0000
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--- Comment #9 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Author: rearnsha
Date: Thu Jan 24 16:06:34 2019
New Revision: 268240
URL: https://gcc.gnu.org/viewcvs?rev=268240&root=gcc&view=rev
Log:
Mitigation for PR target/88469 on arm-based systems bootstrapping with
gcc-6/7/8
This patch, for gcc 8/9 is a mitigation patch for PR target/88469
where gcc-6/7/8 miscompile a structure whose alignment is dominated by
a 64-bit bitfield member. Since the PCS rules for such a type must
ignore any overalignment of the base type we cannot address this by
simply adding a larger alignment to the class. We can, however, force
the alignment of the bit-field itself and GCC will handle that as
desired.
PR target/88469
* profile-count.h (profile_count): On ARM systems using GCC 6/7/8
force the alignment of m_val.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/profile-count.h
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Subject: [Bug target/88469] [7/8 regression] AAPCS - Struct with 64-bit bitfield may be passed in wrong registers
Date: Thu, 24 Jan 2019 16:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88469
--- Comment #10 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Author: rearnsha
Date: Thu Jan 24 16:10:06 2019
New Revision: 268241
URL: https://gcc.gnu.org/viewcvs?rev=268241&root=gcc&view=rev
Log:
Mitigation for PR target/88469 on arm-based systems bootstrapping with
gcc-6/7/8
This patch, for gcc 8/9 is a mitigation patch for PR target/88469
where gcc-6/7/8 miscompile a structure whose alignment is dominated by
a 64-bit bitfield member. Since the PCS rules for such a type must
ignore any overalignment of the base type we cannot address this by
simply adding a larger alignment to the class. We can, however, force
the alignment of the bit-field itself and GCC will handle that as
desired.
PR target/88469
* profile-count.h (profile_count): On ARM systems using GCC 6/7/8
force the alignment of m_val.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/profile-count.h
>From gcc-bugs-return-630737-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 16:19:32 2019
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Subject: [Bug tree-optimization/86865] [9 Regression] Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse=none -fwrapv -fno-tree-ch -fno-tree-dce -fno-tree-dominator-opts -fno-tree-loop-ivcanon
Date: Thu, 24 Jan 2019 16:19:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sebpop at gmail dot com
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, actually the original AST already doesn't match the original GIMPLE:
[scheduler] original ast:
for (int c0 = 0; c0 <= 1; c0 += 1) {
S_3(c0);
for (int c1 = 0; c1 <= 7; c1 += 1)
S_4(c0, c1);
S_9(c0);
}
vs. GIMPLE
<bb 6> [local count: 134036760]:
# prephitmp_8 = PHI <0(2), _1(9)>
if (prephitmp_8 >= 0)
goto <bb 3>; [89.00%]
else
goto <bb 7>; [11.00%] <exit>
<bb 3> [local count: 119292716]:
sa = {};
<bb 4> [local count: 954449108]:
# us_18 = PHI <0(3), us_11(8)>
yt[us_18] = 0;
us_11 = us_18 + 1;
if (us_11 != 8)
goto <bb 8>; [87.50%]
else
goto <bb 5>; [12.50%]
<bb 8> [local count: 835156388]:
goto <bb 4>; [100.00%]
<bb 5> [local count: 119292717]:
<bb 9> [local count: 119292717]:
_1 = prephitmp_8 + -1;
xy = _1;
goto <bb 6>;
here the number of latch executions is one (and BB 9 and thus xy = _1
executes once) while the ISL AST has S_9 executed twice. So the
bug is in how we translate GIMPLE to ISL which assumes do {} while
style loops rather than adjusting iteration domains. I've never
groked the code there fully so the "easiest" way out would be to
require do {} while style loops similar to what the vectorizer
requires.
Index: gcc/graphite-scop-detection.c
===================================================================
--- gcc/graphite-scop-detection.c (revision 268010)
+++ gcc/graphite-scop-detection.c (working copy)
@@ -555,8 +555,15 @@ scop_detection::can_represent_loop (loop
tree niter;
struct tree_niter_desc niter_desc;
- return single_exit (loop)
- && !(loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP)
+ /* We can only handle do {} while () style loops correctly. */
+ edge exit = single_exit (loop);
+ if (!exit
+ || !single_pred_p (loop->latch)
+ || exit->src != single_pred (loop->latch)
+ || !empty_block_p (loop->latch))
+ return false;
+
+ return !(loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP)
&& number_of_iterations_exit (loop, single_exit (loop), &niter_desc,
false)
&& niter_desc.control.no_overflow
&& (niter = number_of_latch_executions (loop))
which in turn FAILs
FAIL: gcc.dg/graphite/scop-21.c scan-tree-dump-times graphite "number of SCoPs:
1" 1
FAIL: gcc.dg/graphite/pr69728.c scan-tree-dump graphite "loop nest optimized"
where loop header copying is "broken" by jump threading for scop-21.c.
>From gcc-bugs-return-630738-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 16:26:17 2019
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Subject: [Bug d/88989] ICE in resolvePropertiesX, at d/dmd/expression.c:251
Date: Thu, 24 Jan 2019 16:26:00 -0000
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--- Comment #3 from G. Steinmetz <gscfq@t-online.de> ---
> Out of curiosity, are you fuzz testing?
In the case of D, yes.
> I had fixed this before in the D implementation branch.
Oh, thanks.
Commit was from 2018-01-14, i.e. over a year ago.
That makes me wonder, when will gdc be synchronized with dmd ?
Apart from that, I will try to find a few more tiny test
cases, preferably easy to track ICEs.
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Subject: [Bug target/89040] Wrong code with -mno-mmx
Date: Thu, 24 Jan 2019 16:27:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
This works on the testcase:
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 9c1bfabe9a7..c24e70d9725 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -41,8 +41,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If
not, see
#define TARGET_64BIT TARGET_ISA_64BIT
#define TARGET_64BIT_P(x) TARGET_ISA_64BIT_P(x)
-#define TARGET_MMX TARGET_ISA_MMX
-#define TARGET_MMX_P(x) TARGET_ISA_MMX_P(x)
+/* In 64-bit mode, use SSE2 to emulate MMX. */
+#define TARGET_MMX (TARGET_ISA_MMX || (TARGET_64BIT && TARGET_SSE2))
+#define TARGET_MMX_P(x) (TARGET_ISA_MMX_P(x) \
+ || (TARGET_64BIT_P (x) && TARGET_SSE2_P (x)))
#define TARGET_3DNOW TARGET_ISA_3DNOW
#define TARGET_3DNOW_P(x) TARGET_ISA_3DNOW_P(x)
#define TARGET_3DNOW_A TARGET_ISA_3DNOW_A
>From gcc-bugs-return-630740-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 16:28:03 2019
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Subject: [Bug d/89041] New: ICE in get_frame_for_symbol, at d/d-codegen.cc:2175
Date: Thu, 24 Jan 2019 16:28:00 -0000
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Bug ID: 89041
Summary: ICE in get_frame_for_symbol, at d/d-codegen.cc:2175
Product: gcc
Version: 9.0
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This statement gives an ICE :
$ cat z1.d
enum a = delegate {};
$ gdc-9-20190120 -c z1.d
z1.d:1:10: internal compiler error: in get_frame_for_symbol, at
d/d-codegen.cc:2175
1 | enum a = delegate {};
| ^
0x768a89 get_frame_for_symbol(Dsymbol*)
../../gcc/d/d-codegen.cc:2175
0x77a960 ExprVisitor::visit(FuncExp*)
../../gcc/d/expr.cc:2128
0x77a13e build_expr(Expression*, bool)
../../gcc/d/expr.cc:3055
0x77988f DeclVisitor::visit(VarDeclaration*)
../../gcc/d/decl.cc:606
0x7765b1 build_decl_tree(Dsymbol*)
../../gcc/d/decl.cc:949
0x782a30 build_module_tree(Module*)
../../gcc/d/modules.cc:717
0x7789eb DeclVisitor::visit(Module*)
../../gcc/d/decl.cc:142
0x7765b1 build_decl_tree(Dsymbol*)
../../gcc/d/decl.cc:949
0x773990 d_parse_file()
../../gcc/d/d-lang.cc:1278
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Subject: [Bug c++/88976] [7/8/9 Regression] ICE in fold_convert_loc, at fold-const.c:2552
Date: Thu, 24 Jan 2019 16:30:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-01-24
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45524
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45524&action=edit
gcc9-pr88976.patch
Untested fix.
>From gcc-bugs-return-630742-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 16:31:18 2019
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Subject: [Bug d/89042] New: ICE in visit, at d/decl.cc:597
Date: Thu, 24 Jan 2019 16:31:00 -0000
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Bug ID: 89042
Summary: ICE in visit, at d/decl.cc:597
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Another enum variation :
$ cat z1.d
enum void[] a = void;
$ cat z2.d
enum void[2] a = void;
$ gdc-9-20190120 -c z1.d
z1.d:1:13: internal compiler error: in visit, at d/decl.cc:597
1 | enum void[] a = void;
| ^
0x779ac6 DeclVisitor::visit(VarDeclaration*)
../../gcc/d/decl.cc:597
0x7765b1 build_decl_tree(Dsymbol*)
../../gcc/d/decl.cc:949
0x782a30 build_module_tree(Module*)
../../gcc/d/modules.cc:717
0x7789eb DeclVisitor::visit(Module*)
../../gcc/d/decl.cc:142
0x7765b1 build_decl_tree(Dsymbol*)
../../gcc/d/decl.cc:949
0x773990 d_parse_file()
../../gcc/d/d-lang.cc:1278
>From gcc-bugs-return-630743-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 16:32:23 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
Date: Thu, 24 Jan 2019 16:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89009
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
> Richi do you have any idea what?
So it's caused by fact that IPA pure-const promotes S3::bar to be const:
Visiting static void S3::bar()/1 state:const looping 0
Call to static void S2::_ZN2S23barEv.localalias()/5 state:const looping:0
Result const looping 0
Function found not to call free: static void S3::bar()
Function found to be const: static void S3::bar()
Declaration updated to be const: static void S3::bar()
Then DCE is happy to remote the function as it's supposed to not have a side
effect.
>From gcc-bugs-return-630744-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 16:46:14 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/89043] New: strcat (strcpy (d, a), b) not folded to stpcpy (strcpy (d, a), b)
Date: Thu, 24 Jan 2019 16:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89043
Bug ID: 89043
Summary: strcat (strcpy (d, a), b) not folded to stpcpy (strcpy
(d, a), b)
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC folds a small subset of calls to C strcpy to the POSIX stpcpy when doing so
is profitable, such as in function f below. But it doesn't do the same folding
in the common case when strcat is being called with the result of strcpy as the
first argument, as in function g below.
$ cat u.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout u.c
extern char* stpcpy (char*, const char*);
extern char* strcat (char*, const char*);
extern char* strcpy (char*, const char*);
extern char* strchr (const char*, int);
extern char *a, *b, *d;
char* f (char *d, const char *s)
{
strcpy (d, s); // folded to 'p = stpcpy (d, s);'
return strchr (d, 0); // folded to 'return p;'
}
void g (void)
{
// could be folded to 'strcpy (stpcpy (d, a));'
strcat (strcpy (d, a), b);
}
;; Function f (f, funcdef_no=0, decl_uid=1922, cgraph_uid=1, symbol_order=0)
f (char * d, const char * s)
{
char * _7;
<bb 2> [local count: 1073741824]:
_7 = __builtin_stpcpy (d_2(D), s_3(D));
return _7;
}
;; Function g (g, funcdef_no=1, decl_uid=1925, cgraph_uid=2, symbol_order=1)
g ()
{
char * b.0_1;
char * a.1_2;
char * d.2_3;
char * _4;
<bb 2> [local count: 1073741824]:
b.0_1 = b;
a.1_2 = a;
d.2_3 = d;
_4 = strcpy (d.2_3, a.1_2);
strcat (_4, b.0_1); [tail call]
return;
}
>From gcc-bugs-return-630745-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 16:47:35 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/89043] strcat (strcpy (d, a), b) not folded to stpcpy (strcpy (d, a), b)
Date: Thu, 24 Jan 2019 16:47:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=82429
Blocks| |83819
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
But see bug 82429 that enables the strcpy -> stpcpy optimization only under
some very restricted conditions.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83819
[Bug 83819] [meta-bug] missing strlen optimizations
>From gcc-bugs-return-630746-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 16:52:37 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
Date: Thu, 24 Jan 2019 16:52:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |WAITING
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Well, I believe the test-case is invalid as one can't have hidden visibility
and then defined S1::f2 in a different translation unit. I would like to see an
example which would be possible to link. This works for me:
$ cat pr89009.h
void foo();
struct S1 { static void bar(); };
struct __attribute__ ((visibility("default"))) S2: S1 { static void bar(); };
struct S3: S1 { static void bar(); };
struct S4: S3 { static void bar(); };
$ cat pr89009.c
#include "pr89009.h"
void S2::bar() { S1::bar(); }
void S3::bar() { S1::bar(); }
void S4::bar() {
foo();
S3::bar(); // MISSING
}
int main()
{
S4::bar ();
}
$ cat pr89009-2.c
#include "pr89009.h"
void foo() { __builtin_printf ("foo called\n"); }
void S1::bar() { __builtin_printf ("S1::bar\n"); }
>From gcc-bugs-return-630747-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 17:01:29 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/89015] [9 Regression] ICE in lookup_decl_in_outer_ctx, at omp-low.c:3480
Date: Thu, 24 Jan 2019 17:01:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45525
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45525&action=edit
gcc9-pr89015.patch
Untested fix.
>From gcc-bugs-return-630748-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 17:07:12 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
Date: Thu, 24 Jan 2019 17:07:00 -0000
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--- Comment #6 from Stephan Bergmann <sbergman at redhat dot com> ---
(In reply to Martin Liška from comment #5)
> Well, I believe the test-case is invalid as one can't have hidden visibility
> and then defined S1::f2 in a different translation unit.
Why? Isn't hidden visibility just about symbol visibility at the
executable/dynamic library level?
>From gcc-bugs-return-630749-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 17:08:21 2019
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From: "ylatuya at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/89044] New: libstdc++-6.dll is installed in the wrong directory cross-compiling with a multilib configuration
Date: Thu, 24 Jan 2019 17:08:00 -0000
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Bug ID: 89044
Summary: libstdc++-6.dll is installed in the wrong directory
cross-compiling with a multilib configuration
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: ylatuya at gmail dot com
Target Milestone: ---
When compiling gcc with multilib support for Linux, libstdc++-6.dll ends ups
installed correctly in lib and lib32:
x86_64-w64-mingw32/lib/libstdc++-6.dll
x86_64-w64-mingw32/lib/libstdc++-6.dll
Instead, when cross-compilng for Windows a single libstdc++6.dll is installed
in the bin dir:
bin/libstdc++-6.dll
Instead the EH library is correctly installed in lib and lib32:
lib/libgcc_s_seh-1.dll
lib32/libgcc_s_sjlj-1.dll
This also happens for libatomic.
>From gcc-bugs-return-630750-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 17:11:58 2019
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Subject: [Bug c++/88988] [8/9 Regression] ICE: Segmentation fault (in lookup_name_real_1)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88988
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2019-01-24
Ever confirmed|0 |1
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It ICEs also with
template <typename T>
struct A {
A () : a ()
{
[&] ()
{
#pragma omp parallel firstprivate (a) if (0)
++a;
} ();
}
T a;
};
A<int> x;
which ought to be valid in OpenMP 5.0 (without if (0) it is racy), not really
valid OpenMP 4.5 because mixing C++11 and later futures like lambda here with
OpenMP features is undefined. We do compile
struct B {
B () : b ()
{
[&] ()
{
#pragma omp parallel firstprivate (b) if (0)
++b;
} ();
}
int b;
};
B y;
though.
>From gcc-bugs-return-630751-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 17:14:16 2019
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Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Stephan Bergmann from comment #6)
> (In reply to Martin Liška from comment #5)
> > Well, I believe the test-case is invalid as one can't have hidden visibility
> > and then defined S1::f2 in a different translation unit.
>
> Why? Isn't hidden visibility just about symbol visibility at the
> executable/dynamic library level?
I might be wrong. But I would like to see a linkable test-case.
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Subject: [Bug c++/88984] [9 Regression] ICE in genericize_switch_stmt, at cp/cp-gimplify.c:377
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
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--- Comment #8 from Stephan Bergmann <sbergman at redhat dot com> ---
...and adding to the test.cc from comment 0 an additional
> $ cat main.cc
> void f1();
> struct S1 { static void f2(); };
> struct __attribute__ ((visibility("default"))) S2: S1 { static void f2(); };
> struct S3: S1 { static void f2(); };
> struct S4: S3 { static void f2(); };
> void f1() { __builtin_printf("f1\n"); }
> void S1::f2() { __builtin_printf("S1::f2\n"); }
> int main() { S4::f2(); }
>
> $ g++ -fvisibility=hidden -fpic -O2 -fno-inline test.cc main.cc
> $ ./a.out
> f1
to form a complete program still fails for me (GCC 8.2.1).
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Subject: [Bug c/44715] Break in increment expression of "for" statement inconsistent with g++
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |jakub at gcc dot gnu.org
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Should be fixed for GCC 9+.
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Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
Thanks for it, confirmed! Started with r244273, but the revision probably only
exposed a latent issue.
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
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--- Comment #16 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Created attachment 45526
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45526&action=edit
Passing testcase
I'm still not sure where the problem is coming in. The loop in the vector dump
looks functionally correct now I've had change to look at it more (contrary to
my initial comment on IRC). It seems to be equivalent to the attached, which
passed on an AVX2 box I found I had accesss to.
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Subject: [Bug tree-optimization/86865] [9 Regression] Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse=none -fwrapv -fno-tree-ch -fno-tree-dce -fno-tree-dominator-opts -fno-tree-loop-ivcanon
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Sebastian Pop <spop at gcc dot gnu.org> changed:
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--- Comment #7 from Sebastian Pop <spop at gcc dot gnu.org> ---
I think the patch is ok.
If in the future we want to handle those other loops, we will need to compute
the loop bound in add_loop_constraints() with a check for whether the stmt is
dominated by the exit or not.
Here is what we do today for all stmts in the loop:
tree nb_iters = number_of_latch_executions (loop);
if (TREE_CODE (nb_iters) == INTEGER_CST)
{
/* loop_i <= cst_nb_iters */
the constraint '<=' on statements' iteration domains implies that the loop
should be under a do-while form.
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Subject: [Bug fortran/89039] Logical read from stream file that is neither 0 nor 1
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> ... so I agree that the proper flag for this report is INVALID.
Then closing.
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Subject: [Bug c/89045] New: [9 Regression] ICE in get_parm_info, at c/c-decl.c:7518
Date: Thu, 24 Jan 2019 17:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89045
Bug ID: 89045
Summary: [9 Regression] ICE in get_parm_info, at
c/c-decl.c:7518
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
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Changed before 20180429, gcc-8 compiles it :
$ cat z1.c
void f (int x)
{
void g (int [(int){ x }]);
}
$ gcc-8 -c z1.c
$
$ gcc-9-20190120 -c z1.c
z1.c: In function 'f':
z1.c:3:3: internal compiler error: in get_parm_info, at c/c-decl.c:7518
3 | void g (int [(int){ x }]);
| ^~~~
0x5e0b57 get_parm_info(bool, tree_node*)
../../gcc/c/c-decl.c:7518
0x6226a8 c_parser_parms_list_declarator
../../gcc/c/c-parser.c:4024
0x622810 c_parser_parms_declarator
../../gcc/c/c-parser.c:3940
0x61c491 c_parser_direct_declarator_inner
../../gcc/c/c-parser.c:3868
0x630731 c_parser_declaration_or_fndef
../../gcc/c/c-parser.c:1999
0x62ffba c_parser_compound_statement_nostart
../../gcc/c/c-parser.c:5068
0x6300a6 c_parser_compound_statement
../../gcc/c/c-parser.c:4980
0x63180a c_parser_declaration_or_fndef
../../gcc/c/c-parser.c:2352
0x6368b3 c_parser_external_declaration
../../gcc/c/c-parser.c:1653
0x637379 c_parser_translation_unit
../../gcc/c/c-parser.c:1534
0x637379 c_parse_file()
../../gcc/c/c-parser.c:19840
0x67d7f0 c_common_parse_file()
../../gcc/c-family/c-opts.c:1155
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From: "boazstud at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/89046] New: GCOV generates incorrect results for C++ Lambda / Constructor
Date: Thu, 24 Jan 2019 17:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89046
Bug ID: 89046
Summary: GCOV generates incorrect results for C++ Lambda /
Constructor
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
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CC: marxin at gcc dot gnu.org
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Created attachment 45527
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45527&action=edit
bug.ii
It seems that gcov-8 does not report executed lines inside a lambda created in
a constructor of a class.
This worked fine with gcov-5
A minimal code that triggers the bug is attached.
in this code, printf is executed but not reported by gcov.
======================== CUT HERE ====================
#include <stdio.h>
struct test {
void (*fn)();
test(void(*fn_)()) : fn(fn_) {}
};
test x([](){
printf("hello, world\n");
});
int main() {
x.fn();
return 0;
}
=================================
gcc bug.cc --coverage -save-temps
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 8.2.0-7ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.2.0 (Ubuntu 8.2.0-7ubuntu1)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-coverage' '-mtune=generic'
'-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/8/cc1plus -E -quiet -v -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE bug.cc -mtune=generic -march=x86-64
-fpch-preprocess -fstack-protector-strong -Wformat -Wformat-security -o bug.ii
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/8"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/8/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/8
/usr/include/x86_64-linux-gnu/c++/8
/usr/include/c++/8/backward
/usr/lib/gcc/x86_64-linux-gnu/8/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/8/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-coverage' '-mtune=generic'
'-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/8/cc1plus -fpreprocessed bug.ii -quiet -dumpbase
bug.cc -mtune=generic -march=x86-64 -auxbase bug -version -fprofile-arcs
-ftest-coverage -fstack-protector-strong -Wformat -Wformat-security -o bug.s
GNU C++14 (Ubuntu 8.2.0-7ubuntu1) version 8.2.0 (x86_64-linux-gnu)
compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.20-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++14 (Ubuntu 8.2.0-7ubuntu1) version 8.2.0 (x86_64-linux-gnu)
compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.20-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: c4394fed592bafb9d6390822500e3507
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-coverage' '-mtune=generic'
'-march=x86-64'
as -v --64 -o bug.o bug.s
GNU assembler version 2.31.1 (x86_64-linux-gnu) using BFD version (GNU Binutils
for Ubuntu) 2.31.1
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-coverage' '-mtune=generic'
'-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/8/collect2 -plugin
/usr/lib/gcc/x86_64-linux-gnu/8/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
-plugin-opt=-fresolution=bug.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --sysroot=/
--build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed
-dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie -z now -z relro
/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o
/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/8/crtbeginS.o -L/usr/lib/gcc/x86_64-linux-gnu/8
-L/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib -L/lib/x86_64-linux-gnu
-L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib
-L/usr/lib/gcc/x86_64-linux-gnu/8/../../.. bug.o -lgcov -lgcc --push-state
--as-needed -lgcc_s --pop-state -lc -lgcc --push-state --as-needed -lgcc_s
--pop-state /usr/lib/gcc/x86_64-linux-gnu/8/crtendS.o
/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/crtn.o
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-coverage' '-mtune=generic'
'-march=x86-64'
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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/88760] GCC unrolling is suboptimal
Date: Thu, 24 Jan 2019 17:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760
--- Comment #22 from ktkachov at gcc dot gnu.org ---
Some more experiments...
Unrolling 4x in a similar way to my previous example and not splitting the
accumulator (separate issue):
unsigned int *colnums;
double *val;
struct foostruct
{
unsigned int rows;
unsigned int *colnums;
unsigned int *rowstart;
};
struct foostruct *cols;
void
foo (double * __restrict__ dst, const double *__restrict__ src)
{
const unsigned int n_rows = cols->rows;
const double *val_ptr = &val[cols->rowstart[0]];
const unsigned int *colnum_ptr = &cols->colnums[cols->rowstart[0]];
double *dst_ptr = dst;
for (unsigned int row=0; row<n_rows; ++row)
{
double s = 0.;
const double *const val_end_of_row = &val[cols->rowstart[row+1]];
__PTRDIFF_TYPE__ diff = val_end_of_row - val_ptr;
if (diff & 1)
{
s += *val_ptr++ * src[*colnum_ptr++];
diff--;
}
if (diff & 2)
{
s += val_ptr[0] * src[colnum_ptr[0]];
s += val_ptr[1] * src[colnum_ptr[1]];
val_ptr += 2;
colnum_ptr += 2;
}
while (val_ptr != val_end_of_row)
{
s += val_ptr[0] * src[colnum_ptr[0]];
s += val_ptr[1] * src[colnum_ptr[1]];
s += val_ptr[2] * src[colnum_ptr[2]];
s += val_ptr[3] * src[colnum_ptr[3]];
val_ptr += 4;
colnum_ptr += 4;
}
*dst_ptr++ = s;
}
}
helps even more. On Cortex-A72 it gives a bit more than 6% (vs 3%) improvement
on parest, and about 5.3% on a more aggressive CPU.
I tried unrolling 8x in a similar manner and that was not faster than 4x on
either target.
Note that perf profiling shows that the loads are what's hot in these loops,
not the FMAs themselves:
4.41 │1b8: ldp w3, w4, [x0]
â–’
5.85 │ ldp d3, d4, [x2]
â–’
│ add x2, x2, #0x20
â–’
3.79 │ ldur d5, [x2, #-16]
â–’
2.82 │ ldr d0, [x1, x4, lsl #3]
â–’
2.53 │ ldr d2, [x1, x3, lsl #3]
â–’
2.10 │ ldp w4, w3, [x0, #8]
â–’
│ add x0, x0, #0x10
â–’
0.00 │ cmp x5, x0
â–’
│ fmul d0, d0, d4
â–’
4.73 │ ldr d4, [x1, x4, lsl #3]
â–’
│ fmadd d0, d3, d2, d0
â–’
2.01 │ ldur d3, [x2, #-8]
â–’
2.54 │ ldr d2, [x1, x3, lsl #3]
â–’
│ fmadd d0, d5, d4, d0
â–’
│ fmadd d0, d3, d2, d0
â–’
│ fadd d1, d1, d0
>From gcc-bugs-return-630762-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 17:54:58 2019
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Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
Date: Thu, 24 Jan 2019 17:54:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work|6.5.0 |4.9.4
Known to fail| |5.5.0, 6.4.0
--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
Ok, so it's as old as ICF. There's a minimal test-case:
$ cat test.cc
#pragma GCC visibility push(default)
void foo1() { __builtin_printf ("foo\n"); }
#pragma GCC visibility pop
void foo2() { __builtin_printf ("foo\n"); }
int main() { foo2(); }
(for older revisions than r244273 one needs:
$ cat test.cc
void foo2() { __builtin_printf ("foo\n"); }
#pragma GCC visibility push(default)
void foo1() { __builtin_printf ("foo\n"); }
#pragma GCC visibility pop
int main() { foo2(); }
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Subject: [Bug ipa/89009] [7/8/9 Regression] Miscompilation (missing function call) with -fvisibility=hidden -fpic -O2 -fno-inline
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
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Subject: [Bug fortran/89047] New: ICE in mark_scope_block_unused, at tree-ssa-live.c:391
Date: Thu, 24 Jan 2019 17:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89047
Bug ID: 89047
Summary: ICE in mark_scope_block_unused, at tree-ssa-live.c:391
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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With option -fopenacc, down to at least version 5 :
$ cat z1.f90
real function f()
!$acc update device (f)
end
$ gfortran-9-20190120 -c z1.f90 -fopenacc
during RTL pass: expand
z1.f90:1:0:
1 | real function f()
|
internal compiler error: Segmentation fault
0xb3658f crash_signal
../../gcc/toplev.c:326
0x77c937 clear_tree_used
../../gcc/cfgexpand.c:1753
0x788d9a expand_used_vars
../../gcc/cfgexpand.c:2080
0x78aca2 execute
../../gcc/cfgexpand.c:6376
---
$ gfortran-9-20190120 -c z1.f90 -fopenacc -O2 -g
$
$ gfortran-9-20190120 -c z1.f90 -fopenacc -O2
during GIMPLE pass: ssa
z1.f90:3:0:
3 | end
|
internal compiler error: Segmentation fault
0xb3658f crash_signal
../../gcc/toplev.c:326
0xc2a3f1 mark_scope_block_unused
../../gcc/tree-ssa-live.c:391
0xc2a41a mark_scope_block_unused
../../gcc/tree-ssa-live.c:395
0xc2b751 remove_unused_locals()
../../gcc/tree-ssa-live.c:741
0xa70f44 execute_function_todo
../../gcc/passes.c:1955
0xa71e32 execute_todo
../../gcc/passes.c:2031
>From gcc-bugs-return-630765-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 17:59:15 2019
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Subject: [Bug c/89035] Request - builtins for unspecified and arbitrary values
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Note that an uninitialized local variable has an indeterminate value which,
even if it's not a trap representation, can appear to change from one instance
to another, and whose use results in undefined behavior (see also
https://gcc.gnu.org/ml/gcc/2019-01/msg00199.html).
>From gcc-bugs-return-630766-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 18:04:49 2019
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Subject: [Bug c++/89038] #pragma GCC diagnostic ignored "-Wunknown-pragmas" does not work
Date: Thu, 24 Jan 2019 18:04:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-24
CC| |msebor at gcc dot gnu.org
Component|preprocessor |c++
Ever confirmed|0 |1
Known to fail| |4.3.5, 4.4.7, 4.8.5, 4.9.4,
| |5.4.0, 6.4.0, 7.3.0, 8.2.0,
| |9.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. It works correctly in C but has never worked in C++ so it's not a
regression.
>From gcc-bugs-return-630767-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 18:06:36 2019
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Subject: [Bug fortran/89047] ICE in mark_scope_block_unused, at tree-ssa-live.c:391
Date: Thu, 24 Jan 2019 18:06:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> With option -fopenacc, down to at least version 5 :
-fopenacc is new in GCC-5.
For trunk (9.0) on darwin with --enable-checking=yes, I get
during GIMPLE pass: omplower
pr89047.f90:2:0:
2 | !$acc update device (f)
|
internal compiler error: in get, at cgraph.h:2579
with/without -O2 or -g.
>From gcc-bugs-return-630768-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 18:16:20 2019
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Subject: [Bug d/88989] ICE in resolvePropertiesX, at d/dmd/expression.c:251
Date: Thu, 24 Jan 2019 18:15:00 -0000
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--- Comment #4 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
(In reply to G. Steinmetz from comment #3)
>
> Commit was from 2018-01-14, i.e. over a year ago.
> That makes me wonder, when will gdc be synchronized with dmd ?
>
The main dmd branch has been converted over to D as of v2.069. Whereas gdc is
a continuation of the old C++ branch, with new features and bug fixes converted
back to C++. Its equivalence is v2.076, with a few extra regression patches.
Reason for staying with the C++ branch is so that gdc 9 release can be ported
to as many platforms as possible. Then switch over to the D branch and be in
lock-step with upstream dmd with regards to the latest implementation.
>From gcc-bugs-return-630769-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 18:18:04 2019
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Subject: [Bug d/88989] ICE in resolvePropertiesX, at d/dmd/expression.c:251
Date: Thu, 24 Jan 2019 18:18:00 -0000
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--- Comment #5 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
(In reply to Iain Buclaw from comment #4)
> ported to as many platforms as possible. Then switch over to the D branch
> and be in lock-step with upstream dmd with regards to the latest
> implementation.
I mean, as of gdc 10, so version 9 becomes the baseline for bootstrapping
latter versions.
>From gcc-bugs-return-630770-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 18:25:09 2019
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Subject: [Bug c++/88951] [9 Regression] No fpermissive offerred on 'error: jump to case label'
Date: Thu, 24 Jan 2019 18:25:00 -0000
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--- Comment #4 from Bence Szabó <sbence92 at gmail dot com> ---
Ok, I agree with all of what you wrote. Please close the PR as you wish.
>From gcc-bugs-return-630771-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 18:54:31 2019
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Subject: [Bug lto/87187] FAIL: gfortran.dg/short_circuiting_3.f90 -g -flto (internal compiler error) on darwin
Date: Thu, 24 Jan 2019 18:54:00 -0000
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--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
This fixes also libgomp.fortran/taskloop3.f90. Thanks.
>From gcc-bugs-return-630772-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 19:01:13 2019
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
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--- Comment #17 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to rsandifo@gcc.gnu.org from comment #16)
> Created attachment 45526 [details]
> Passing testcase
>
> I'm still not sure where the problem is coming in. The loop in the vector
> dump looks functionally correct now I've had change to look at it more
> (contrary to my initial comment on IRC). It seems to be equivalent to the
> attached, which passed on an AVX2 box I found I had accesss to.
But it fails on a skylake-avx512 machine. Minimal test-case that fails:
$ cat avx.c
struct s { unsigned long a, b, c; };
void __attribute__ ((noipa))
f (struct s *restrict s1, struct s *restrict s2, int n)
{
for (int i = 0; i < n; ++i)
{
s1[i].b = s2[i].b;
s1[i].c = s2[i].c;
s2[i].c = 0;
}
}
#define N 6
int
main (void)
{
struct s s1[N], s2[N];
for (unsigned int j = 0; j < 6; ++j)
{
s2[j].a = j * 5;
s2[j].b = j * 5 + 2;
s2[j].c = j * 5 + 4;
}
f (s1, s2, 6);
for (unsigned int j = 0; j < 6; ++j)
if (s1[j].b != j * 5 + 2)
{
__builtin_printf ("wrong at: %d: is %d, should be %d\n", j,
s1[j].b, j * 5 + 2);
__builtin_abort ();
}
__builtin_printf ("OK\n");
return 0;
}
$ gcc -march=skylake-avx512 avx.c -g && ./a.out && gcc -march=skylake-avx512
avx.c -g -O3 && ./a.out
OK
wrong at: 3: is 15, should be 17
Aborted (core dumped)
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Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 19:08:00 -0000
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--- Comment #18 from Martin Liška <marxin at gcc dot gnu.org> ---
One can reproduce that with Intel SDE simulator:
https://software.intel.com/protected-download/267266/144917
$ ./sde-external-8.16.0-2018-01-30-lin/sde -skx -- /tmp/a.out
wrong at: 3: is 15, should be 17
Aborted (core dumped)
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Subject: [Bug target/88998] [7/8/9 Regression] bad codegen with mmx instructions for unordered_map
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--- Comment #6 from uros at gcc dot gnu.org ---
Author: uros
Date: Thu Jan 24 19:12:55 2019
New Revision: 268242
URL: https://gcc.gnu.org/viewcvs?rev=268242&root=gcc&view=rev
Log:
PR target/88998
* config/i386/sse.md (sse2_cvtpi2pd): Add SSE alternatives.
Disparage MMX alternative.
(sse2_cvtpd2pi): Ditto.
(sse2_cvttpd2pi): Ditto.
testsuite/ChangeLog:
PR target/88998
* g++.dg/pr88998.c: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/pr88998.C
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/i386/sse.md
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c++/89048] New: constant evaluation in trailing return type rejected
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Bug ID: 89048
Summary: constant evaluation in trailing return type rejected
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This program is rejected by gcc:
template <int V> struct X { };
template <typename F> constexpr auto f(F f) -> X<f()> { return {}; }
with:
source>:3:53: error: template argument 1 is invalid
3 | template <typename F> constexpr auto f(F f) -> X<f()> { return {}; }
| ^
<source>:3:53: error: template argument 1 is invalid
<source>:3:53: error: template argument 1 is invalid
<source>:3:53: error: template argument 1 is invalid
<source>:3:48: error: invalid template-id
3 | template <typename F> constexpr auto f(F f) -> X<f()> { return {}; }
| ^
<source>:3:51: error: use of parameter outside function body before '(' token
3 | template <typename F> constexpr auto f(F f) -> X<f()> { return {}; }
| ^
<source>:3:38: error: deduced class type 'X' in function return type
3 | template <typename F> constexpr auto f(F f) -> X<f()> { return {}; }
| ^
<source>:1:25: note: 'template<int V> struct X' declared here
1 | template <int V> struct X { };
| ^
Compiler returned: 1
On the other hand, this program is accepted:
template <int V> struct X { };
template <typename F> constexpr auto g(F f) { return X<f()>{}; }
Clang accepts both. I think both programs are valid.
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Subject: [Bug tree-optimization/89027] [9 Regression] ICE: verify_gimple failed (Error: non-trivial conversion at assignment)
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Jan 24 19:14:51 2019
New Revision: 268243
URL: https://gcc.gnu.org/viewcvs?rev=268243&root=gcc&view=rev
Log:
PR tree-optimization/89027
* tree-inline.c (add_clobbers_to_eh_landing_pad): Don't add clobbers
for "omp simd array" variables.
* gfortran.dg/gomp/pr89027.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/gomp/pr89027.f90
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-inline.c
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--- Comment #7 from uros at gcc dot gnu.org ---
Author: uros
Date: Thu Jan 24 19:14:58 2019
New Revision: 268244
URL: https://gcc.gnu.org/viewcvs?rev=268244&root=gcc&view=rev
Log:
PR target/88998
* config/i386/sse.md (sse2_cvtpi2pd): Add SSE alternatives.
Disparage MMX alternative.
(sse2_cvtpd2pi): Ditto.
(sse2_cvttpd2pi): Ditto.
testsuite/ChangeLog:
PR target/88998
* g++.dg/pr88998.c: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/pr88998.C
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/i386/sse.md
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c++/88976] [7/8/9 Regression] ICE in fold_convert_loc, at fold-const.c:2552
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Jan 24 19:16:21 2019
New Revision: 268245
URL: https://gcc.gnu.org/viewcvs?rev=268245&root=gcc&view=rev
Log:
PR c++/88976
* c-typeck.c (c_finish_omp_cancel): Diagnose more than one if
on #pragma omp cancel with different modifiers.
* semantics.c (finish_omp_cancel): Diagnose more than one if
on #pragma omp cancel with different modifiers. Use
maybe_convert_cond when not in template or build_x_binary_op
otherwise.
* c-c++-common/gomp/cancel-2.c: New test.
* gcc.dg/gomp/cancel-1.c: New test.
* g++.dg/gomp/cancel-1.C: New test.
* g++.dg/gomp/cancel-2.C: New test.
* g++.dg/gomp/cancel-3.C: New test.
Added:
trunk/gcc/testsuite/c-c++-common/gomp/cancel-2.c
trunk/gcc/testsuite/g++.dg/gomp/cancel-1.C
trunk/gcc/testsuite/g++.dg/gomp/cancel-2.C
trunk/gcc/testsuite/g++.dg/gomp/cancel-3.C
trunk/gcc/testsuite/gcc.dg/gomp/cancel-1.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-typeck.c
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/semantics.c
trunk/gcc/testsuite/ChangeLog
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Uroš Bizjak <ubizjak at gmail dot com> changed:
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--- Comment #8 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed everywhere.
>From gcc-bugs-return-630780-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 19:17:52 2019
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Subject: [Bug middle-end/89015] [9 Regression] ICE in lookup_decl_in_outer_ctx, at omp-low.c:3480
Date: Thu, 24 Jan 2019 19:17:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Jan 24 19:17:13 2019
New Revision: 268246
URL: https://gcc.gnu.org/viewcvs?rev=268246&root=gcc&view=rev
Log:
PR middle-end/89015
* tree-nested.c (convert_nonlocal_reference_stmt,
convert_local_reference_stmt, convert_tramp_reference_stmt,
convert_gimple_call) <case GIMPLE_OMP_TEAMS>: Treat
gimple_omp_teams_host teams stmts like GIMPLE_OMP_PARALLEL
or GIMPLE_OMP_TASK.
* gcc.dg/gomp/pr89015.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/gomp/pr89015.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-nested.c
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Subject: [Bug c++/89038] #pragma GCC diagnostic ignored "-Wunknown-pragmas" does not work
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
I think this is a dup of something but I can't remember the bug number right
now; I'll search harder later...
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Subject: [Bug tree-optimization/89043] strcat (strcpy (d, a), b) not folded to stpcpy (strcpy (d, a), b)
Date: Thu, 24 Jan 2019 19:28:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
stpcpy() is POSIX? Which version? My (admittedly old) manpage says "The
stpcpy() function is an MS-DOS and GNUism. The stpcpy() function conforms to
no standard."
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Subject: [Bug c/89035] Request - builtins for unspecified and arbitrary values
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Brown from comment #2)
> Yes, "int x = x;" does give an unspecified value without a warning.
Really, not even one from -Winit-self?
>From gcc-bugs-return-630784-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 19:36:20 2019
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Subject: [Bug c++/89048] constant evaluation in trailing return type rejected
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--- Comment #1 from Barry Revzin <barry.revzin at gmail dot com> ---
Actually, now I'm really not sure if this is a gcc bug, but then I really don't
know what the language rule is that rejects this. Sorry for the spam, this
needs some more thought.
>From gcc-bugs-return-630785-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 19:43:42 2019
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Subject: [Bug libfortran/89020] close(status='DELETE') does not remove file
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--- Comment #5 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Thu, Jan 24, 2019 at 01:32:56PM +0000, tkoenig at gcc dot gnu.org wrote:
>
> However, I'd like to look at the code first and check if we
> can actually accommodate this strange behavior without pessimizing
> anything else. If so, I would be inclined to "fix" this.
>
I took a quick peek at the code. I actually could not find
where we set iostat and iomsg if present. For this simple
program
program foo
i = 42
open(unit=7, file='tmp.dat')
write(7,*) 'tmp.dat'
close(7,iostat=i)
print *, i
end program foo
the relevant part of -fdump-tree-original looks like
{
struct __st_parameter_close close_parm.2;
close_parm.2.common.filename = &"t.f90"[1]{lb: 1 sz: 1};
close_parm.2.common.line = 5;
i = 0;
close_parm.2.common.iostat = &i;
close_parm.2.common.flags = 32;
close_parm.2.common.unit = 7;
_gfortran_st_close (&close_parm.2);
}
So we pass the address of i in the close_parm, but I
don't see libgfortran/io/close.c doing anything with
.iostat (or .iomsg). In fact, st_close() doesn't
check the return status of remove()?
Of course, I could be missing something obvious. Jerry?
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Subject: [Bug tree-optimization/88964] [8 Regression] ICE in wide_int_to_tree_1, at tree.c:1561
Date: Thu, 24 Jan 2019 19:49:00 -0000
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Jan 24 19:49:09 2019
New Revision: 268247
URL: https://gcc.gnu.org/viewcvs?rev=268247&root=gcc&view=rev
Log:
PR tree-optimization/88964
* gimple-loop-interchange.cc (loop_cand::analyze_induction_var): Also
punt if HONOR_SNANS (chrec).
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gimple-loop-interchange.cc
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Subject: [Bug middle-end/89015] [9 Regression] ICE in lookup_decl_in_outer_ctx, at omp-low.c:3480
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-630788-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 19:51:55 2019
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Subject: [Bug c++/88976] [7/8 Regression] ICE in fold_convert_loc, at fold-const.c:2552
Date: Thu, 24 Jan 2019 19:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88976
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.0
Summary|[7/8/9 Regression] ICE in |[7/8 Regression] ICE in
|fold_convert_loc, at |fold_convert_loc, at
|fold-const.c:2552 |fold-const.c:2552
Known to fail|9.0 |
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed on the trunk so far.
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Subject: [Bug c++/89001] g++ uses wrong mangling for lifetime-extended temporaries
Date: Thu, 24 Jan 2019 19:52:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-630790-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 20:01:59 2019
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/89049] New: [8/9 Regression] Unexpected vectorization
Date: Thu, 24 Jan 2019 20:01:00 -0000
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Bug ID: 89049
Summary: [8/9 Regression] Unexpected vectorization
Product: gcc
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int bar (float *p) { float r = 0; for (int i = 0; i < 1024; ++i) r += p[i];
return r; }
with -O2 -mavx2 -ftree-vectorize starting with r256639 is vectorized as:
.L6:
vmovups (%rdi), %xmm4
vinsertf128 $0x1, 16(%rdi), %ymm4, %ymm2
addq $32, %rdi
vaddss %xmm4, %xmm0, %xmm0
vshufps $85, %xmm4, %xmm4, %xmm3
vshufps $255, %xmm4, %xmm4, %xmm1
vaddss %xmm3, %xmm0, %xmm0
vunpckhps %xmm4, %xmm4, %xmm3
vaddss %xmm3, %xmm0, %xmm0
vaddss %xmm1, %xmm0, %xmm0
vextractf128 $0x1, %ymm2, %xmm1
vshufps $85, %xmm1, %xmm1, %xmm2
vaddss %xmm1, %xmm0, %xmm0
vaddss %xmm2, %xmm0, %xmm0
vunpckhps %xmm1, %xmm1, %xmm2
vshufps $255, %xmm1, %xmm1, %xmm1
vaddss %xmm2, %xmm0, %xmm0
vaddss %xmm1, %xmm0, %xmm0
cmpq %rdi, %rax
jne .L6
The only vector thing in the loop is the vector unaligned load, all the rest
are either extractions from the vector or scalar operations. At least for -O2
I'd hope we don't do this, I strongly believe scalar loop would be faster, and
if we don't decide to unroll it, even much smaller. Either the costs are
computed wrongly here, or the vectorizer uses them wrongly.
>From gcc-bugs-return-630791-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 20:02:37 2019
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Subject: [Bug tree-optimization/89049] [8/9 Regression] Unexpected vectorization
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-linux
CC| |hjl.tools at gmail dot com,
| |rsandifo at gcc dot gnu.org,
| |uros at gcc dot gnu.org
Target Milestone|--- |8.3
>From gcc-bugs-return-630792-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 20:13:13 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 20:13:00 -0000
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--- Comment #19 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
OK. The .optimized dumps seem to be the same for both -mavx2 and
-march=skylake-avx512. Things only diverge during expand.
It looks like it might be a bug in:
(define_insn "<mask_codefor>avx512dq_shuf_<shuffletype>64x2_1<mask_name>"
[(set (match_operand:VI8F_256 0 "register_operand" "=v")
(vec_select:VI8F_256
(vec_concat:<ssedoublemode>
(match_operand:VI8F_256 1 "register_operand" "v")
(match_operand:VI8F_256 2 "nonimmediate_operand" "vm"))
(parallel [(match_operand 3 "const_0_to_3_operand")
(match_operand 4 "const_0_to_3_operand")
(match_operand 5 "const_4_to_7_operand")
(match_operand 6 "const_4_to_7_operand")])))]
"TARGET_AVX512VL
&& (INTVAL (operands[3]) == (INTVAL (operands[4]) - 1)
&& INTVAL (operands[5]) == (INTVAL (operands[6]) - 1))"
{
int mask;
mask = INTVAL (operands[3]) / 2;
mask |= (INTVAL (operands[5]) - 4) / 2 << 1;
operands[3] = GEN_INT (mask);
return "vshuf<shuffletype>64x2\t{%3, %2, %1,
%0<mask_operand7>|%0<mask_operand7>, %1, %2, %3}";
}
[(set_attr "type" "sselog")
(set_attr "length_immediate" "1")
(set_attr "prefix" "evex")
(set_attr "mode" "XI")])
which AFAICT requires without checking that operands 3 and 5 are even (0 or 2
and 4 or 6 respectively). In this case we're using it to match:
(insn 40 39 41 6 (set (reg:V4DI 101 [ vect__5.17 ])
(vec_select:V4DI (vec_concat:V8DI (reg:V4DI 98 [ vect__5.14 ])
(reg:V4DI 140 [ vect__5.15 ]))
(parallel [
(const_int 2 [0x2])
(const_int 3 [0x3])
(const_int 5 [0x5])
(const_int 6 [0x6])
]))) "/tmp/foo.c":8:22 4069 {*avx512dq_shuf_i64x2_1}
(nil))
and treat the permute mask as {2, 3, 4, 5} instead.
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Subject: [Bug target/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 20:15:00 -0000
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |NEW
Component|tree-optimization |target
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--- Comment #20 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Not really best placed to fix or test this.
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Subject: [Bug c++/89050] New: GCC sometimes requires this to be captured when doing overload resolution but selecting a static member function
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Bug ID: 89050
Summary: GCC sometimes requires this to be captured when doing
overload resolution but selecting a static member
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$ cat x.cpp
template <class T> struct A {
static void f();
void f(int);
void foo() {
[]{ f(); };
}
};
void foo(A<int> &a) {
a.foo();
}
$ g++ -fsyntax-only x.cpp
x.cpp: In lambda function:
x.cpp:6:15: error: ‘this’ was not captured for this lambda function
[]{ f(); };
^
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
--enable-cet=auto
Thread model: posix
gcc version 8.2.1 20181127 (GCC)
If A is not a template or there is no competing non-static member named f, this
works fine. This is basically bug 51494 but with templates and overload
resolution.
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Subject: [Bug debug/89006] [9 Regression] New note: non-delegitimized UNSPEC UNSPEC_SET_GOT (14) found in variable location since r267638
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Jan 24 20:20:47 2019
New Revision: 268248
URL: https://gcc.gnu.org/viewcvs?rev=268248&root=gcc&view=rev
Log:
PR debug/89006
* config/i386/i386.c (ix86_pic_register_p): Return true for
UNSPEC_SET_GOT too.
* g++.dg/debug/pr89006.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/debug/pr89006.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug debug/89006] [9 Regression] New note: non-delegitimized UNSPEC UNSPEC_SET_GOT (14) found in variable location since r267638
Date: Thu, 24 Jan 2019 20:22:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug target/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 20:28:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #21 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'll handle this.
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/88993] [9 Regression] GCC 9 -Wformat-overflow=2 should reflect real libc limits
Date: Thu, 24 Jan 2019 20:33:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-24
Known to work| |8.2.0
Blocks| |85741
Summary|GCC 9 -Wformat-overflow=2 |[9 Regression] GCC 9
|should reflect real libc |-Wformat-overflow=2 should
|limits |reflect real libc limits
Ever confirmed|0 |1
Known to fail| |9.0
--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Thanks. I've built qemu 3.1.0 with -Wformat-overflow=2 myself and reproduced
the warnings below. Of those, 16 are for fprintf, 106 for printf, and 20 for
sprintf. At least some of these look like they would be hard to deal with and
for little gain. For example:
qemu-3.1.0/linux-user/main.c:484:27: warning: ‘%-*s’ directive output
between 0 and 2147483648 bytes may exceed minimum required size of 4095
[-Wform
at-overflow=]
484 | printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
| ^~~~
Let me confirm this as a regression and look into doing something about it for
GCC 9.
Diagnostic Count Unique Files
-Wstringop-truncation 247 1 1
-Waddress-of-packed-member 189 134 15
-Wformat-overflow= 143 24 6
-Wformat-overflow Instances:
/build/tmp/qemu-3.1.0/hw/intc/exynos4210_gic.c:316
/build/tmp/qemu-3.1.0/hw/intc/exynos4210_gic.c:326
/build/tmp/qemu-3.1.0/hw/vfio/pci.c:2220
/build/tmp/qemu-3.1.0/linux-user/main.c:475
/build/tmp/qemu-3.1.0/linux-user/main.c:480
/build/tmp/qemu-3.1.0/linux-user/main.c:484
migration/savevm.c:418
migration/savevm.c:420
migration/savevm.c:421
migration/savevm.c:423
migration/savevm.c:425
migration/savevm.c:430
migration/savevm.c:447
migration/savevm.c:449
migration/savevm.c:452
migration/savevm.c:453
migration/savevm.c:455
migration/savevm.c:461
migration/savevm.c:476
migration/savevm.c:482
migration/savevm.c:492
migration/savevm.c:494
qemu-img.c:200
qemu-io.c:422
-Wstringop-truncation Instances:
/usr/include/bits/string_fortified.h:106
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85741
[Bug 85741] [meta-bug] bogus/missing -Wformat-overflow
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Subject: [Bug middle-end/89037] checking ice emitting 128-bit bit-field initializer
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> Richard, can you have a look?
Sure. And yeah, agree an extract_uhwi-based sequence is the way to go.
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Subject: [Bug tree-optimization/89043] strcat (strcpy (d, a), b) not folded to stpcpy (strcpy (d, a), b)
Date: Thu, 24 Jan 2019 20:39:00 -0000
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--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
The CHANGE HISTORY section for stpcpy says the function was first released in
Issue 1 and derived from Issue 1 of the SVID:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/stpcpy.html
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Subject: [Bug c++/55319] Using -fwhole-program inhibits optimization
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m101010a at gmail dot com changed:
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--- Comment #4 from m101010a at gmail dot com ---
This is no longer an issue in GCC 8.2.1
>From gcc-bugs-return-630802-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 20:46:05 2019
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Subject: [Bug target/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
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--- Comment #22 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Even more reduced testcase:
typedef long long int V __attribute__((vector_size (4 * sizeof (long long
int))));
__attribute__((noipa))
void foo (V *p)
{
p[0] = __builtin_shuffle (p[1], p[2], (V) { 2, 3, 5, 6 });
}
int
main ()
{
V a[3] = { { 0, 0, 0, 0 }, { 10, 11, 12, 13 }, { 14, 15, 16, 17 } };
foo (a);
if (a[0][0] != 12 || a[0][1] != 13 || a[0][2] != 15 || a[0][3] != 16)
__builtin_abort ();
return 0;
}
Works with -O2 -mavx2, aborts with -O2 -mavx512vl.
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Subject: [Bug rtl-optimization/88948] [9 Regression] ICE in elimination_costs_in_insn, at reload1.c:3640 since r264148
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88948
--- Comment #4 from uros at gcc dot gnu.org ---
Author: uros
Date: Thu Jan 24 20:48:01 2019
New Revision: 268249
URL: https://gcc.gnu.org/viewcvs?rev=268249&root=gcc&view=rev
Log:
PR target/88948
* rtl.h (prepare_copy_insn): New prototype.
* gcse.c (prepare_copy_insn): New function, split out from
process_insert_insn.
(process_insert_insn): Use prepare_copy_insn.
* store-motion.c (replace_store_insn): Use prepare_copy_insn
instead of gen_move_insn.
testsuite/ChangeLog:
PR target/88948
* gcc.target/i386/pr88948.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr88948.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gcse.c
trunk/gcc/rtl.h
trunk/gcc/store-motion.c
trunk/gcc/testsuite/ChangeLog
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/89043] strcat (strcpy (d, a), b) not folded to stpcpy (strcpy (d, a), b)
Date: Thu, 24 Jan 2019 20:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89043
--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Thu, 24 Jan 2019, msebor at gcc dot gnu.org wrote:
> The CHANGE HISTORY section for stpcpy says the function was first released in
> Issue 1 and derived from Issue 1 of the SVID:
> http://pubs.opengroup.org/onlinepubs/9699919799/functions/stpcpy.html
That's a CHANGE HISTORY for the page as a whole (also covering strcpy) -
the addition of stpcpy is listed there under issue 7 "The stpcpy()
function is added from The Open Group Technical Standard, 2006, Extended
API Set Part 1.". I checked and stpcpy is not in issue 1 or 3 of XPG or
issue 1 or 2 of SVID.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/86125] missing -Wbuiltin-declaration-mismatch on a mismatched return type
Date: Thu, 24 Jan 2019 21:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86125
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Thu Jan 24 21:06:01 2019
New Revision: 268251
URL: https://gcc.gnu.org/viewcvs?rev=268251&root=gcc&view=rev
Log:
PR c/86125 - missing -Wbuiltin-declaration-mismatch on a mismatched return type
PR middle-end/86308 - ICE in verify_gimple calling index() with an invalid
declaration
PR c/86125 - missing -Wbuiltin-declaration-mismatch on a mismatched return type
PR c/88886 - [9 Regression] ice in get_constant, at c-family/c-format.c:292
gcc/c/ChangeLog:
PR c/86125
PR c/88886
PR middle-end/86308
* c-decl.c (match_builtin_function_types): Add arguments.
(diagnose_mismatched_decls): Diagnose mismatched declarations
of built-ins more strictly.
gcc/testsuite/ChangeLog:
PR c/86125
PR c/88886
PR middle-end/86308
* gcc.dg/Wbuiltin-declaration-mismatch-6.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-7.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-8.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-9.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-10.c: New test.
* gcc.dg/builtins-69.c: New test.
* gcc.dg/Wint-conversion-2.c: Add expected warning.
* gcc.c-torture/execute/eeprof-1.c: Adjust function signatures.
Added:
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-10.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-6.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-7.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-8.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-9.c
trunk/gcc/testsuite/gcc.dg/builtins-69.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-decl.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.c-torture/execute/eeprof-1.c
trunk/gcc/testsuite/gcc.dg/Wint-conversion-2.c
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/88886] [9 Regression] ice in get_constant, at c-family/c-format.c:292
Date: Thu, 24 Jan 2019 21:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88886
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Thu Jan 24 21:06:01 2019
New Revision: 268251
URL: https://gcc.gnu.org/viewcvs?rev=268251&root=gcc&view=rev
Log:
PR c/86125 - missing -Wbuiltin-declaration-mismatch on a mismatched return type
PR middle-end/86308 - ICE in verify_gimple calling index() with an invalid
declaration
PR c/86125 - missing -Wbuiltin-declaration-mismatch on a mismatched return type
PR c/88886 - [9 Regression] ice in get_constant, at c-family/c-format.c:292
gcc/c/ChangeLog:
PR c/86125
PR c/88886
PR middle-end/86308
* c-decl.c (match_builtin_function_types): Add arguments.
(diagnose_mismatched_decls): Diagnose mismatched declarations
of built-ins more strictly.
gcc/testsuite/ChangeLog:
PR c/86125
PR c/88886
PR middle-end/86308
* gcc.dg/Wbuiltin-declaration-mismatch-6.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-7.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-8.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-9.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-10.c: New test.
* gcc.dg/builtins-69.c: New test.
* gcc.dg/Wint-conversion-2.c: Add expected warning.
* gcc.c-torture/execute/eeprof-1.c: Adjust function signatures.
Added:
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-10.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-6.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-7.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-8.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-9.c
trunk/gcc/testsuite/gcc.dg/builtins-69.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-decl.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.c-torture/execute/eeprof-1.c
trunk/gcc/testsuite/gcc.dg/Wint-conversion-2.c
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/86308] [7/8/9 Regression] ICE in verify_gimple calling an invalid index() declaration
Date: Thu, 24 Jan 2019 21:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86308
--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Thu Jan 24 21:06:01 2019
New Revision: 268251
URL: https://gcc.gnu.org/viewcvs?rev=268251&root=gcc&view=rev
Log:
PR c/86125 - missing -Wbuiltin-declaration-mismatch on a mismatched return type
PR middle-end/86308 - ICE in verify_gimple calling index() with an invalid
declaration
PR c/86125 - missing -Wbuiltin-declaration-mismatch on a mismatched return type
PR c/88886 - [9 Regression] ice in get_constant, at c-family/c-format.c:292
gcc/c/ChangeLog:
PR c/86125
PR c/88886
PR middle-end/86308
* c-decl.c (match_builtin_function_types): Add arguments.
(diagnose_mismatched_decls): Diagnose mismatched declarations
of built-ins more strictly.
gcc/testsuite/ChangeLog:
PR c/86125
PR c/88886
PR middle-end/86308
* gcc.dg/Wbuiltin-declaration-mismatch-6.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-7.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-8.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-9.c: New test.
* gcc.dg/Wbuiltin-declaration-mismatch-10.c: New test.
* gcc.dg/builtins-69.c: New test.
* gcc.dg/Wint-conversion-2.c: Add expected warning.
* gcc.c-torture/execute/eeprof-1.c: Adjust function signatures.
Added:
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-10.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-6.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-7.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-8.c
trunk/gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-9.c
trunk/gcc/testsuite/gcc.dg/builtins-69.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-decl.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.c-torture/execute/eeprof-1.c
trunk/gcc/testsuite/gcc.dg/Wint-conversion-2.c
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Subject: [Bug middle-end/86308] [7/8 Regression] ICE in verify_gimple calling an invalid index() declaration
Date: Thu, 24 Jan 2019 21:21:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[7/8/9 Regression] ICE in |[7/8 Regression] ICE in
|verify_gimple calling an |verify_gimple calling an
|invalid index() declaration |invalid index() declaration
--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed for GCC 9 via r268251. GCC now issues the following warnings:
$ cat pr86308.c && /build/arm-none-eabi/gcc-svn/gcc/xgcc -B
/build/arm-none-eabi/gcc-svn/gcc -S -Wall -Wextra pr86308.c
int index (int, int);
void foo(const short *input)
{
short a0 = input[index(0, 0)];
}
pr86308.c:1:5: warning: conflicting types for built-in function ‘index’;
expected ‘char *(const char *, int)’ [-Wbuiltin-declaration-mismatch]
1 | int index (int, int);
| ^~~~~
pr86308.c: In function ‘foo’:
pr86308.c:5:11: warning: unused variable ‘a0’ [-Wunused-variable]
5 | short a0 = input[index(0, 0)];
| ^~
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Subject: [Bug target/87214] [9 Regression] r263772 miscompiled 520.omnetpp_r in SPEC CPU 2017
Date: Thu, 24 Jan 2019 21:22:00 -0000
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--- Comment #23 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 45528
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45528&action=edit
gcc9-pr87214-wip.patch
Untested fix. Still need to cover all the changes with testcases.
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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/89001] g++ uses wrong mangling for lifetime-extended temporaries
Date: Thu, 24 Jan 2019 21:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89001
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Thu Jan 24 21:23:33 2019
New Revision: 268252
URL: https://gcc.gnu.org/viewcvs?rev=268252&root=gcc&view=rev
Log:
PR c++/89001 - mangling of reference temporaries
It used to be the case that the mangled name of a reference temporary didn't
need to be standardized, because all access would be through the reference.
But now constant expressions can look through references and so different
translation units need to agree on the address of a temporary in the
initializer of a reference with vague linkage.
* cp-tree.h (struct saved_scope): Add ref_temp_count.
(current_ref_temp_count): New macro.
* mangle.c (mangle_ref_init_variable): Use it.
* typeck2.c (store_init_value): Clear it.
* call.c (make_temporary_var_for_ref_to_temp): Copy public and
comdat.
Added:
trunk/gcc/testsuite/g++.dg/abi/ref-temp1.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/mangle.c
trunk/gcc/cp/typeck2.c
trunk/gcc/testsuite/g++.dg/cpp1z/decomp34.C
>From gcc-bugs-return-630811-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 21:25:37 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/88886] [9 Regression] ice in get_constant, at c-family/c-format.c:292
Date: Thu, 24 Jan 2019 21:25:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed via r268251. GCC issues the following warnings for the test case in
comment #0:
$ cat pr88886.c && gcc -S -Wall -Wextra pr88886.c
int sscanf(long, unsigned[], ...);
void a() { sscanf(0, ""); }
pr88886.c:1:5: warning: conflicting types for built-in function ‘sscanf’;
expected ‘int(const char *, const char *, ...)’
[-Wbuiltin-declaration-mismatch]
1 | int sscanf(long, unsigned[], ...);
| ^~~~~~
pr88886.c:1:1: note: ‘sscanf’ is declared in header ‘<stdio.h>’
+++ |+#include <stdio.h>
1 | int sscanf(long, unsigned[], ...);
pr88886.c: In function ‘a’:
pr88886.c:2:22: warning: passing argument 2 of ‘sscanf’ from incompatible
pointer type [-Wincompatible-pointer-types]
2 | void a() { sscanf(0, ""); }
| ^~
| |
| char *
pr88886.c:1:18: note: expected ‘unsigned int *’ but argument is of type ‘char
*’
1 | int sscanf(long, unsigned[], ...);
| ^~~~~~~~~~
>From gcc-bugs-return-630812-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 21:29:16 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/89043] strcat (strcpy (d, a), b) not folded to stpcpy (strcpy (d, a), b)
Date: Thu, 24 Jan 2019 21:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89043
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Ah, makes sense. I briefly wondered how stpcpy could have been "updated for
alignment with the ISO/IEC 9899:1999 standard." That's the trade-off of a 4k
monitor: it fits tons of stuff on the screen but everything is so tiny that I
end up guessing as much as reading.
>From gcc-bugs-return-630813-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 21:40:21 2019
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/89036] ICE if destructor has a requires
Date: Thu, 24 Jan 2019 21:40:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org
--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Fails this assertion in cp/class.c:add_method:
1136 /* A class should never have more than one destructor. */
1137 gcc_assert (!current_fns || via_using || !DECL_DESTRUCTOR_P
(method));
>From gcc-bugs-return-630814-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 21:49:45 2019
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/88995] [8/9 Regression] internal compiler error: in lookup_template_class_1, at cp/pt.c:9471
Date: Thu, 24 Jan 2019 21:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88995
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-24
CC| |jakub at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Somewhat further reduced:
typedef enum {} a;
typedef enum { b, c, d, e, f } g;
typedef enum {
h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, aa, ab, ac, ad, ae,
af, ag, ah, ai, aj, ak, al, am, an
} ao;
typedef struct {
long aq[];
} ar;
struct as;
using ay = a;
using az = g;
const az ba = b;
const az bb = c;
const az bc = d;
const az bd = e;
const az be = f;
using bf = ao;
const bf any = h;
const bf bg = i;
const bf bh = j;
const bf bi = k;
const bf bj = l;
const bf bk = m;
const bf bl = n;
const bf bm = o;
const bf bn = p;
const bf bo = q;
const bf bp = r;
const bf bq = s;
const bf br = t;
const bf bs = u;
const bf bt = v;
const bf bu = w;
const bf bv = x;
const bf bw = y;
const bf bx = z;
const bf by = aa;
const bf bz = ab;
const bf ca = ac;
const bf cb = ad;
const bf cc = ae;
const bf cd = af;
const bf ce = ag;
const bf cf = ah;
const bf cg = ai;
const bf ch = aj;
const bf ci = ak;
const bf cj = al;
const bf ck = am;
const bf cl = an;
using cm = ar;
using cn = as;
using cp = int;
using cq = int;
using cr = int;
class cx {
public:
template <typename cy> cx(cy, cy);
};
struct da {
da(int );
cm db();
};
struct at {
virtual ay dc(int **, const int *, const int **) const;
};
struct as {
typedef ay (*dd)(at **, const int *, const int *, const int *);
};
struct de {
de(at *, cx, cx);
};
struct dg {
~dg();
};
struct dh : at {
using di = dg;
di dj;
};
namespace dk {
const bool dl = true;
const bool dm = false;
} template <bool, typename> struct dn ;
template <bool order_keep> struct dn<order_keep, void> {
static ay execute() {
da input_d = 0;
constexpr bool w_groups = by;
auto _g_oihw_d = input_d;
[&] { auto _g_oihw_off = _g_oihw_d.db().aq[w_groups]; };
return ay();
}
};
template <int, bf , int, bf , int, typename spec = void>
struct srt : de {
struct dg : dh {
dg(di *, di *, const cp *);
ay dc(cq **, const cr *inputs, const cq **outputs) const {
cx ins(inputs, inputs);
cx outs(outputs, outputs);
srt(this, ins, outs);
return ay();
}
static ay ct(at **, const int *input_pd, const int *output_pd, const cp
*attr) {
auto _pd = new dg((di *)input_pd, (di *)output_pd, attr);
delete _pd;
return ay();
}
};
srt(const dg *pd, cx inputs, cx outputs) : de(&conf_, inputs, outputs),
conf_(*pd) {
dn<1, spec>::execute;
}
dg conf_;
};
template <int, int, int, int, int> struct wrt {
struct dg {
static ay ct(at **, const int *, const int *, const cp *);
};
};
using rpd_ct_f = cn::dd;
rpd_ct_f cql[]{
srt<ba, any, ba, any, any>::dg::ct,
srt<ba, any, ba, bj, dk::dl>::dg::ct,
srt<ba, any, ba, bj, dk::dm>::dg::ct,
srt<ba, any, ba, bk, dk::dl>::dg::ct,
srt<ba, any, ba, bk, dk::dm>::dg::ct,
srt<ba, any, ba, bw, dk::dl>::dg::ct,
srt<ba, any, ba, bw, dk::dm>::dg::ct,
srt<ba, any, ba, bx, dk::dl>::dg::ct,
srt<ba, any, ba, bx, dk::dm>::dg::ct,
srt<ba, any, ba, bo, dk::dl>::dg::ct,
srt<ba, any, ba, bo, dk::dm>::dg::ct,
srt<ba, any, ba, bp, dk::dl>::dg::ct,
srt<ba, any, ba, bp, dk::dm>::dg::ct,
srt<ba, any, ba, bu, dk::dl>::dg::ct,
srt<ba, any, ba, bu, dk::dm>::dg::ct,
srt<ba, any, ba, bq, dk::dl>::dg::ct,
srt<ba, any, ba, bq, dk::dm>::dg::ct,
srt<ba, any, ba, bn, dk::dl>::dg::ct,
srt<ba, any, ba, bn, dk::dm>::dg::ct,
srt<ba, any, ba, bm, dk::dl>::dg::ct,
srt<ba, any, ba, bm, dk::dm>::dg::ct,
srt<ba, any, ba, bv, dk::dl>::dg::ct,
srt<ba, any, ba, bv, dk::dm>::dg::ct,
srt<ba, any, ba, cf, dk::dl>::dg::ct,
srt<ba, any, ba, cf, dk::dm>::dg::ct,
srt<ba, any, ba, cg, dk::dl>::dg::ct,
srt<ba, any, ba, cg, dk::dm>::dg::ct,
srt<ba, any, ba, cj, dk::dl>::dg::ct,
srt<ba, any, ba, cj, dk::dm>::dg::ct,
srt<ba, any, ba, ck, dk::dl>::dg::ct,
srt<ba, any, ba, ck, dk::dm>::dg::ct,
srt<ba, any, ba, cd, dk::dl>::dg::ct,
srt<ba, any, ba, cd, dk::dm>::dg::ct,
srt<ba, any, ba, bz, dk::dl>::dg::ct,
srt<ba, any, ba, bz, dk::dm>::dg::ct,
srt<ba, any, ba, ci, dk::dl>::dg::ct,
srt<ba, any, ba, ci, dk::dm>::dg::ct,
srt<ba, any, ba, ch, dk::dl>::dg::ct,
srt<ba, any, ba, ch, dk::dm>::dg::ct,
srt<ba, any, ba, ce, dk::dl>::dg::ct,
srt<ba, any, ba, ce, dk::dm>::dg::ct,
srt<be, bg, ba, bi, dk::dl>::dg::ct,
srt<be, bg, ba, bj, dk::dl>::dg::ct,
srt<ba, bg, ba, bi, dk::dl>::dg::ct,
srt<ba, bg, ba, bi, dk::dm>::dg::ct,
srt<ba, bg, ba, bj, dk::dl>::dg::ct,
srt<ba, bg, ba, bj, dk::dm>::dg::ct,
srt<ba, bi, ba, bj, dk::dl>::dg::ct,
srt<ba, bi, ba, bj, dk::dm>::dg::ct,
wrt<2, by, bd, cl, dk::dl>::dg::ct,
wrt<2, bl, bd, cl, dk::dl>::dg::ct,
srt<ba, bg, bb, bh, dk::dl>::dg::ct,
srt<ba, bg, bb, bh, dk::dm>::dg::ct,
srt<ba, bg, bd, bh, dk::dl>::dg::ct,
srt<ba, bg, bd, bh, dk::dm>::dg::ct,
srt<ba, bg, be, bh, dk::dl>::dg::ct,
srt<ba, bg, be, bh, dk::dm>::dg::ct,
srt<bb, bg, ba, bh, dk::dl>::dg::ct,
srt<bb, bg, ba, bh, dk::dm>::dg::ct,
srt<bb, bg, ba, bh, dk::dl>::dg::ct,
srt<bb, bg, bb, bh, dk::dm>::dg::ct,
srt<bb, bg, bd, bh, dk::dl>::dg::ct,
srt<bb, bg, bd, bh, dk::dm>::dg::ct,
srt<bb, bg, be, bh, dk::dl>::dg::ct,
srt<bb, bg, be, bh, dk::dm>::dg::ct,
srt<bd, bg, ba, bh, dk::dl>::dg::ct,
srt<bd, bg, ba, bh, dk::dm>::dg::ct,
srt<bd, bg, bb, bh, dk::dl>::dg::ct,
srt<bd, bg, bb, bh, dk::dm>::dg::ct,
srt<bd, bg, bd, bh, dk::dl>::dg::ct,
srt<bd, bg, bd, bh, dk::dm>::dg::ct,
srt<bd, bg, be, bh, dk::dl>::dg::ct,
srt<bd, bg, be, bh, dk::dm>::dg::ct,
srt<be, bg, ba, bh, dk::dl>::dg::ct,
srt<be, bg, ba, bh, dk::dm>::dg::ct,
srt<be, bg, bb, bh, dk::dm>::dg::ct,
srt<be, bg, bb, bh, dk::dl>::dg::ct,
srt<be, bg, bd, bh, dk::dl>::dg::ct,
srt<be, bg, bd, bh, dk::dm>::dg::ct,
srt<be, bg, be, bh, dk::dl>::dg::ct,
srt<be, bg, be, bh, dk::dm>::dg::ct,
srt<bd, bh, ba, bi, dk::dl>::dg::ct,
srt<bd, bh, ba, bi, dk::dm>::dg::ct,
srt<bd, bh, bb, bi, dk::dl>::dg::ct,
srt<bd, bh, bb, bi, dk::dm>::dg::ct,
srt<bd, bh, bd, bi, dk::dl>::dg::ct,
srt<bd, bh, bd, bi, dk::dm>::dg::ct,
srt<bd, bh, be, bi, dk::dl>::dg::ct,
srt<bd, bh, be, bi, dk::dm>::dg::ct,
srt<ba, bh, bb, bi, dk::dl>::dg::ct,
srt<ba, bh, bb, bi, dk::dm>::dg::ct,
srt<ba, bh, bd, bi, dk::dl>::dg::ct,
srt<ba, bh, bd, bi, dk::dm>::dg::ct,
srt<ba, bh, be, bi, dk::dl>::dg::ct,
srt<ba, bh, be, bi, dk::dm>::dg::ct,
srt<bb, bh, bd, bi, dk::dl>::dg::ct,
srt<bb, bh, bd, bi, dk::dm>::dg::ct,
srt<bb, bh, bb, bi, dk::dl>::dg::ct,
srt<bb, bh, bb, bi, dk::dm>::dg::ct,
srt<bb, bh, ba, bi, dk::dl>::dg::ct,
srt<bb, bh, ba, bi, dk::dm>::dg::ct,
srt<bb, bh, be, bi, dk::dl>::dg::ct,
srt<bb, bh, be, bi, dk::dm>::dg::ct,
srt<be, bh, bd, bi, dk::dl>::dg::ct,
srt<be, bh, bd, bi, dk::dm>::dg::ct,
srt<be, bh, bb, bi, dk::dl>::dg::ct,
srt<be, bh, bb, bi, dk::dm>::dg::ct,
srt<be, bh, be, bi, dk::dl>::dg::ct,
srt<be, bh, be, bi, dk::dm>::dg::ct,
srt<be, bh, ba, bi, dk::dl>::dg::ct,
srt<be, bh, ba, bi, dk::dm>::dg::ct,
srt<bd, bh, ba, bj, dk::dl>::dg::ct,
srt<bd, bh, ba, bj, dk::dm>::dg::ct,
srt<bd, bh, bb, bj, dk::dl>::dg::ct,
srt<bd, bh, bb, bj, dk::dm>::dg::ct,
srt<bd, bh, bd, bj, dk::dl>::dg::ct,
srt<bd, bh, bd, bj, dk::dm>::dg::ct,
srt<bd, bh, be, bj, dk::dl>::dg::ct,
srt<bd, bh, be, bj, dk::dm>::dg::ct,
srt<ba, bh, bb, bj, dk::dl>::dg::ct,
srt<ba, bh, bb, bj, dk::dm>::dg::ct,
srt<ba, bh, bd, bj, dk::dl>::dg::ct,
srt<ba, bh, bd, bj, dk::dm>::dg::ct,
srt<ba, bh, be, bj, dk::dl>::dg::ct,
srt<ba, bh, be, bj, dk::dm>::dg::ct,
srt<bb, bh, bd, bj, dk::dl>::dg::ct,
srt<bb, bh, bd, bj, dk::dm>::dg::ct,
srt<bb, bh, bb, bj, dk::dl>::dg::ct,
srt<bb, bh, bb, bj, dk::dm>::dg::ct,
srt<bb, bh, ba, bj, dk::dl>::dg::ct,
srt<bb, bh, ba, bj, dk::dm>::dg::ct,
srt<bb, bh, ba, bj, dk::dm>::dg::ct,
srt<bb, bh, be, bj, dk::dl>::dg::ct,
srt<bb, bh, be, bj, dk::dm>::dg::ct,
srt<be, bh, bd, bj, dk::dl>::dg::ct,
srt<be, bh, bd, bj, dk::dm>::dg::ct,
srt<be, bh, bb, bj, dk::dl>::dg::ct,
srt<be, bh, bb, bj, dk::dm>::dg::ct,
srt<be, bh, be, bj, dk::dl>::dg::ct,
srt<be, bh, be, bj, dk::dm>::dg::ct,
srt<be, bh, ba, bj, dk::dl>::dg::ct,
srt<be, bh, ba, bj, dk::dm>::dg::ct,
srt<bd, bl, bd, br, dk::dl>::dg::ct,
srt<bd, bl, bd, br, dk::dm>::dg::ct,
srt<bd, by, bd, ca, dk::dl>::dg::ct,
srt<bd, by, bd, ca, dk::dm>::dg::ct,
srt<be, bl, be, br, dk::dl>::dg::ct,
srt<be, bl, be, br, dk::dm>::dg::ct,
srt<be, by, be, ca, dk::dl>::dg::ct,
srt<be, by, be, ca, dk::dm>::dg::ct,
srt<be, bl, bd, br, dk::dl>::dg::ct,
srt<be, bl, bd, br, dk::dm>::dg::ct,
srt<be, by, bd, ca, dk::dl>::dg::ct,
srt<be, by, bd, ca, dk::dm>::dg::ct,
srt<bd, bl, be, br, dk::dl>::dg::ct,
srt<bd, bl, be, br, dk::dm>::dg::ct,
srt<bd, by, be, ca, dk::dl>::dg::ct,
srt<bd, by, be, ca, dk::dm>::dg::ct,
srt<be, bl, bb, br, dk::dl>::dg::ct,
srt<be, bl, bb, br, dk::dm>::dg::ct,
srt<be, by, bb, ca, dk::dl>::dg::ct,
srt<be, by, bb, ca, dk::dm>::dg::ct,
srt<bd, bl, bb, br, dk::dl>::dg::ct,
srt<bd, bl, bb, br, dk::dm>::dg::ct,
srt<bd, by, bb, ca, dk::dl>::dg::ct,
srt<bd, by, bb, ca, dk::dm>::dg::ct,
srt<bb, bl, be, br, dk::dl>::dg::ct,
srt<bb, bl, be, br, dk::dm>::dg::ct,
srt<bb, by, be, ca, dk::dl>::dg::ct,
srt<bb, by, be, ca, dk::dm>::dg::ct,
srt<bb, bl, bd, br, dk::dl>::dg::ct,
srt<bb, bl, bd, br, dk::dm>::dg::ct,
srt<bb, by, bd, ca, dk::dl>::dg::ct,
srt<bb, by, bd, ca, dk::dm>::dg::ct,
srt<bb, bl, bb, br, dk::dl>::dg::ct,
srt<bb, bl, bb, br, dk::dm>::dg::ct,
srt<bb, by, bb, ca, dk::dl>::dg::ct,
srt<bb, by, bb, ca, dk::dm>::dg::ct,
srt<bc, bl, bc, bs, dk::dl>::dg::ct,
srt<bc, bl, bc, bs, dk::dm>::dg::ct,
srt<bc, by, bc, cb, dk::dl>::dg::ct,
srt<bc, by, bc, cb, dk::dm>::dg::ct,
srt<bc, bs, bc, bt, dk::dl>::dg::ct,
srt<bc, bs, bc, bt, dk::dm>::dg::ct,
srt<bc, cb, bc, cc, dk::dl>::dg::ct,
srt<bc, cb, bc, cc, dk::dm>::dg::ct};
>From gcc-bugs-return-630815-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 21:50:42 2019
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From: "anlauf at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85868] Subarray of a pointer array associated with a pointer dummy argument
Date: Thu, 24 Jan 2019 21:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85868
--- Comment #5 from Harald Anlauf <anlauf at gmx dot de> ---
Better testcase for debugging:
program pr85858
implicit none
integer, pointer :: t(:)
integer :: i, lb
lb = -1
allocate (t(lb:5))
do i = lb, 5
t(i) = i
end do
call te (t( :)) ! Full array: OK
call te (t(lb:)) ! Array section, but effectively full array: OK
call te (t( 0:)) ! Offset should depend on 0-lb !
call te (t( 1:)) ! Offset should depend on 1-lb !
contains
subroutine te (a)
integer, pointer, intent(in) :: a(:)
print *, a(1) !, lbound (a, dim=1)
end subroutine te
end program
Expected output: four 1s.
Current trunk prints:
1
1
2
3
(Outputs of 7.x and 8.x are also quite strange).
Dump-tree-original shows for the generated descriptors (excerpt):
for call te (t(lb:))
D.3893 = (integer(kind=8)) lb;
parm.3.dim[0].lbound = D.3893;
D.3901 = t.dim[0].stride;
parm.3.data = (void *) &(*(integer(kind=4)[0:] *) t.data)[(D.3893 -
t.dim[0].lbound) * D.3901];
parm.3.offset = t.offset;
for call te (t( 0:))
parm.4.dim[0].lbound = 0;
parm.4.data = (void *) &(*(integer(kind=4)[0:] *)
t.data)[-t.dim[0].lbound * D.3909];
parm.4.offset = t.offset;
while the subroutine references:
(a->data + (sizetype) ((a->offset + NON_LVALUE_EXPR <a->dim[0].stride>) *
a->span))
Can this be right? If .data changes, shouldn't .offset change accordingly?
>From gcc-bugs-return-630816-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 21:57:12 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/86125] missing -Wbuiltin-declaration-mismatch on a mismatched return type
Date: Thu, 24 Jan 2019 21:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86125
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Known to work| |9.0
Resolution|--- |FIXED
Target Milestone|--- |9.0
Known to fail| |8.2.0
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
The warning has been enhanced to detect the strlen mismatch in r268251, but it
requires -Wextra. This was done to avoid diagnosing some more-or-less benign
mismatches (like in const qualifiers) but I don't think it applies as well when
the mismatch is between an integer and pointer. But I suppose tightening that
up will need to wait for the future. Let me resolve this as fixed and think
about opening a new bug for that.
$ gcc -S -Wall -Wextra pr86125.c
pr86125.c:1:7: warning: conflicting types for built-in function ‘strdup’;
expected ‘char *(const char *)’ [-Wbuiltin-declaration-mismatch]
1 | char* strdup (int); // warning (good)
| ^~~~~~
pr86125.c:2:7: warning: mismatch in return type of built-in function ‘strlen’;
expected ‘long unsigned int’ [-Wbuiltin-declaration-mismatch]
2 | char* strlen (const char*); // missing warning
| ^~~~~~
>From gcc-bugs-return-630817-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 21:59:33 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/89036] [8/9 Regression] ICE if destructor has a requires
Date: Thu, 24 Jan 2019 21:59:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-24
Summary|ICE if destructor has a |[8/9 Regression] ICE if
|requires |destructor has a requires
Ever confirmed|0 |1
>From gcc-bugs-return-630818-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 22:01:40 2019
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Subject: [Bug c++/89001] g++ uses wrong mangling for lifetime-extended temporaries
Date: Thu, 24 Jan 2019 22:01:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for GCC 9.
>From gcc-bugs-return-630819-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 22:25:50 2019
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Subject: [Bug fortran/88821] Inline packing of non-contiguous arguments
Date: Thu, 24 Jan 2019 22:25:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #45514|0 |1
is obsolete| |
--- Comment #4 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Created attachment 45529
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45529&action=edit
Updated patch
This one is cleaner - at least it is clearer why it is working :-)
>From gcc-bugs-return-630820-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 22:37:09 2019
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Subject: [Bug c/88956] [9 Regression] ICE: Floating point exception on a memcpy from an zero-length constant array
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |patch
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2019-01/msg01340.html
>From gcc-bugs-return-630821-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 22:47:25 2019
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Subject: [Bug lto/88643] -Wl,--wrap not supported with LTO
Date: Thu, 24 Jan 2019 22:47:00 -0000
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Sergei Trofimovich <slyfox at inbox dot ru> changed:
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--- Comment #3 from Sergei Trofimovich <slyfox at inbox dot ru> ---
One of Gentoo users rediscovered similar bug on cmocka-1.1.3 project:
https://bugs.gentoo.org/675876
It exhibits as a linker failure:
# LANG=C make V=1 VERBOSE=1
/usr/lib64/ccache/bin/x86_64-pc-linux-gnu-gcc -O2 -pipe -flto
-fdiagnostics-show-option -frecord-gcc-switches -Wl,-O1 -Wl,--as-needed -O2
-pipe -flto -Wl,--hash-style=gnu -Wl,--wrap=uptime
CMakeFiles/test_uptime.dir/test_uptime.c.o -o test_uptime
-Wl,-rpath,/dev/shm/portage/dev-util/cmocka-1.1.3/work/cmocka-1.1.3-abi_x86_64.amd64/src
../../../src/libcmocka.so.0.5.1 /usr/lib/librt.so
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../x86_64-pc-linux-gnu/bin/ld:
/tmp/cc3ig6Xu.ltrans0.ltrans.o: in function `calc_uptime':
<artificial>:(.text+0x46): undefined reference to `__wrap_uptime'
collect2: error: ld returned 1 exit status
Would extracting another example be useful here?
>From gcc-bugs-return-630822-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 22:52:04 2019
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Subject: [Bug c++/88995] [8/9 Regression] internal compiler error: in lookup_template_class_1, at cp/pt.c:9471
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--- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
template <typename> struct dn
{
static void execute (long *ary)
{
constexpr int index = 0;
[&] { auto &elt = ary [index]; };
}
};
void foo ()
{
dn<void>::execute;
}
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Subject: [Bug c++/88995] [8/9 Regression] internal compiler error: in lookup_template_class_1, at cp/pt.c:9471
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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Subject: [Bug c/89051] New: -Wno-error= does not work for warning groups
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Bug ID: 89051
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$ cat x.c
void f() { g(1); }
$ gcc -fsyntax-only -Wall -Wno-implicit x.c
$ gcc -fsyntax-only -Werror=all -Wno-error=implicit x.c
x.c: In function ‘f’:
x.c:1:12: error: implicit declaration of function ‘g’
[-Werror=implicit-function-declaration]
void f() { g(1); }
^
cc1: some warnings being treated as errors
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
--enable-cet=auto
Thread model: posix
gcc version 8.2.1 20181127 (GCC)
-Wno-error=* should work like -Wno-* and disable errors for more specific
groups of warnings.
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Subject: [Bug c++/80916] [7/8/9 Regression] Spurious "declared 'static' but never defined" warning
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Jason Merrill <jason at gcc dot gnu.org> changed:
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>From gcc-bugs-return-630826-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 23:27:43 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/89052] New: excessive data segment size causes a hang
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Bug ID: 89052
Summary: excessive data segment size causes a hang
Product: gcc
Version: 9.0
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Making a silly mistake and using the wrong macro such as SIZE_MAX instead of
MAX_SIZE as the array size when defining a global object seems to cause as to
hang presumably while trying to allocate huge amounts of memory. It's not
immediately obvious what the problem might be in such a case.
GCC already warns when the size of any single object exceeds some maximum but
it could help prevent this kind of a mistake by computing the size of all
global objects (or even the size of local objects in each function) and issuing
a warning such as -Wlarger-than= or even an error when the total size of all of
them exceeds the same limit. The current permissive limit is PTRDIFF_MAX but I
don't think there are too many 64-bit systems that can actually handle that
much memory so using a lower limit lower would be even better.
$ (cat a.c && ulimit -v 10000 && gcc -Wall -c a.c)
#include <stdint.h>
#define MAX_SIZE 32
char a[SIZE_MAX / 2] = "1"; // typo: should have been MAX_SIZE / 2
char b[SIZE_MAX / 2] = "x"; // ditto
xgcc: internal compiler error: Segmentation fault signal terminated program cc1
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87295] [early debug] ICE with -ffat-lto-objects -fdebug-types-section -g
Date: Thu, 24 Jan 2019 23:28:00 -0000
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Jan Hubicka <hubicka at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu.org,
| |rguenther at suse dot de
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
I suppose it is early debug tooling not knowing that it needs to copy the
section as well?
>From gcc-bugs-return-630828-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 23:41:49 2019
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Subject: [Bug middle-end/89052] excessive data segment size causes a hang
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--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Clang seems to use SIZE_MAX / 8 as the maximum object size and gives an error
for any object whose size exceeds that. But it doesn't seem to doesn't track
total object sizes and crashes in LLVM as it runs out of memory for the test
case below:
#include <stdint.h>
char a[SIZE_MAX / 8] = "1";
char b[SIZE_MAX / 8] = "x";
In C mode, GCC compiles the code above without hanging anywhere but G++ gives
errors. In fact, it fails with the same error even for 'char a[INT_MAX >> 2] =
"1";'
a.c:3:24: error: initializer-string for array of chars is too long
[-fpermissive]
3 | char a[SIZE_MAX / 8] = "1";
| ^~~
a.c:4:24: error: initializer-string for array of chars is too long
[-fpermissive]
4 | char b[SIZE_MAX / 8] = "x";
| ^~~
>From gcc-bugs-return-630829-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 24 23:50:14 2019
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Subject: [Bug c++/89053] New: initializer-string too long for a large char array initialized with empty string
Date: Thu, 24 Jan 2019 23:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89053
Bug ID: 89053
Summary: initializer-string too long for a large char array
initialized with empty string
Product: gcc
Version: 9.0
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While experimenting with the test case for pr89052 I came across the following
error issued by the G++ front-end for the string literal initializer. Since
the equivalent brace-enclosed initializer is accepts the error looks like a bug
rather than a simple limitation.
$ cat a.c && gcc -S -Wall -xc++ a.c
#include <limits.h>
char a[INT_MAX >> 2] = { '\0' }; // accepted
char b[INT_MAX >> 2] = ""; // error
a.c:4:24: error: initializer-string for array of chars is too long
[-fpermissive]
4 | char b[INT_MAX >> 2] = ""; // error
| ^~
>From gcc-bugs-return-630830-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:03:55 2019
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Subject: [Bug libgomp/87834] nvptx offloading: "WARNING: program timed out" for libgomp.fortran/target2.f90 execution test at -O0, -O1
Date: Fri, 25 Jan 2019 00:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87834
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
This test fails in this mode until r265929. At r265938, this test-case starts
passing. Inbetween, build problems.
The main failure is "libgomp: cuCtxSynchronize error: an illegal memory access
was encountered", and is as mentioned in PR81691 comment 2 not specific to the
target.
Presumably, the root cause for the main failure is fixed by the OpenMP 5.0
changes in r265930.
Consequently, the npvtx libgomp plugin errors following the main failure, be it
either the hang in this PR or the PR81691 "libgomp: cuMemFreeHost
error/libgomp: device finalization failed" errors don't trigger anymore.
Going back to the failing r265929, and applying:
- [nvptx, libgomp] Fix cuMemAlloc with size zero
- [nvptx, libgomp] Fix assert (!s->map->active) in map_fini
- [nvptx, libgomp] Fix map_push
gets us back the main failure:
...
libgomp: cuCtxSynchronize error: an illegal memory access was encountered
FAIL: libgomp.fortran/target2.f90 -O0 execution test
libgomp: cuCtxSynchronize error: an illegal memory access was encountered
FAIL: libgomp.fortran/target2.f90 -O1 execution test
...
So it seems this is a duplicate of one or a combination of the PRs fixed by
those three commits. Marking it resolved-fixed, since I'm not sure which one to
mark it a duplicate of.
>From gcc-bugs-return-630831-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:08:16 2019
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Subject: [Bug libgomp/81691] libgomp.fortran/target2.f90 fails for nvptx at -O0 and -O1
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
The main failure is "libgomp: cuCtxSynchronize error: an illegal memory access
was encountered".
Presumably, the root cause for the main failure is fixed by the OpenMP 5.0
changes in r265930, which should also fix it for intelmic.
Marking this resolved-fixed.
>From gcc-bugs-return-630832-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:10:40 2019
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Subject: [Bug d/89054] New: libphobos/src/std/math.d:5279:18: error: undefined iden tifier 'ControlState'
Date: Fri, 25 Jan 2019 00:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89054
Bug ID: 89054
Summary: libphobos/src/std/math.d:5279:18: error: undefined
iden tifier 'ControlState'
Product: gcc
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Host: hppa-unknown-linux-gnu
Target: hppa-unknown-linux-gnu
Build: hppa-unknown-linux-gnu
libtool: compile: /home/dave/gnu/gcc/objdir/./gcc/gdc
-B/home/dave/gnu/gcc/objd
ir/./gcc/ -B/home/dave/opt/gnu/gcc/gcc-9/hppa-linux-gnu/bin/
-B/home/dave/opt/gn
u/gcc/gcc-9/hppa-linux-gnu/lib/ -isystem
/home/dave/opt/gnu/gcc/gcc-9/hppa-linux
-gnu/include -isystem /home/dave/opt/gnu/gcc/gcc-9/hppa-linux-gnu/sys-include
-f
checking=1 -fPIC -O2 -g -nostdinc -I ../../../../gcc/libphobos/src -I
../../../.
./gcc/libphobos/libdruntime -I ../libdruntime -I . -c
../../../../gcc/libphobos/
src/std/json.d -fversion=Shared -o std/.libs/json.o
/home/dave/gnu/gcc/gcc-9/libphobos/src/std/math.d:5279:18: error: undefined
iden
tifier 'ControlState'
5279 | ControlState savedState;
| ^
/home/dave/gnu/gcc/gcc-9/libphobos/src/std/math.d:5326:25: error: undefined
iden
tifier 'ControlState'
5326 | static ControlState getControlState() @trusted nothrow @nogc
| ^
/home/dave/gnu/gcc/gcc-9/libphobos/src/std/math.d:5392:17: error: undefined
iden
tifier 'ControlState'
5392 | static void setControlState(ControlState newState) @trusted nothrow
@nogc
| ^
make[4]: *** [Makefile:1628: std/json.lo] Error 1
make[4]: Leaving directory
'/home/dave/gnu/gcc/objdir/hppa-linux-gnu/libphobos/src'
>From gcc-bugs-return-630833-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:16:11 2019
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Subject: [Bug c++/89055] New: wrong location with predefined macros
Date: Fri, 25 Jan 2019 00:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89055
Bug ID: 89055
Summary: wrong location with predefined macros
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While adding tests for a fix for bug 87996 I noticed that the location in
diagnostic messages for excessive array size expressions involving predefined
constants like __SIZE_MAX__ (or macros like SIZE_MAX) isn't quite the same as
without such constants. It's a minor aesthetic glitch but one that suggests
there's some underlying bug somewhere that might be worth investigating.
$ cat t.C && gcc -S t.C
char a[~0LU << 1];
char b[__SIZE_MAX__ << 1];
t.C:1:13: error: size of array ‘a’ is negative
1 | char a[~0LU << 1];
| ~~~~~^~~~
t.C:2:21: error: size of array ‘b’ is negative
2 | char b[__SIZE_MAX__ << 1];
| ^
>From gcc-bugs-return-630834-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:26:13 2019
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Subject: [Bug c++/89056] New: Optimizer generates bad code for non-void function that fails to return a value
Date: Fri, 25 Jan 2019 00:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89056
Bug ID: 89056
Summary: Optimizer generates bad code for non-void function
that fails to return a value
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Created attachment 45530
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45530&action=edit
preprocessed file
System: ancient Red Hat Enterprise Linux Server release 6.10 (Santiago)
Intel x86_64 system.
g++ -v
Using built-in specs.
COLLECT_GCC=/hped/builds/tfstools/gcc540/linux_x86_64//gcc/8.2.0/bin/g++_x86_64
COLLECT_LTO_WRAPPER=/a/new/sr/proton/d11/build/tfstools/gcc472/linux_x86_64/gcc/8.2.0/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --enable-checking=release --enable-languages=c,c++
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --disable-multilib --with-system-zlib
--prefix=/hped/builds/tfstools/gcc472/linux_x86_64/gcc/8.2.0_rebld
--with-gmp=/gfs/sr/sherry/d1/local/dbjornba/btmp
--with-mpfr=/gfs/sr/sherry/d1/local/dbjornba/btmp
--with-mpc=/gfs/sr/sherry/d1/local/dbjornba/btmp
Thread model: posix
gcc version 8.2.0 (GCC)
If you have cruddy code with a non-void function that fails to return a value,
the gcc optimizer can generate an "infinite" loop for a simple iterative loop
(see the end of the *.ii file):
bool test::bah(void)
{
std::deque<struct foo>::iterator iter;
for (iter = values.begin(); iter != values.end(); iter++)
iter->myval -= 0.1;
// returning a value here causes correct code to be generated.
}
The bug can be easily seen using:
g++ -S -O badbad.cc
badbad.cc: In member function 'bool test::bah()':
badbad.cc:42:1: warning: no return statement in function returning non-void
[-Wreturn-type]
}
^
The generated assembly code shows an "infinite" loop for the simple iterative
loop (which only "terminates" when a bus error occurs). The correct code is
generated if you add a proper return value.
Yes, this is a poster child for using -Werror=return-type, but gcc should still
not generate bad code (the return value will, of course, still be undefined).
>From gcc-bugs-return-630837-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:47:39 2019
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Subject: [Bug c++/89056] Optimizer generates bad code for non-void function that fails to return a value
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
You can use -fsanatizer=undefined to find this behavior at runtime.
>From gcc-bugs-return-630835-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:47:17 2019
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Subject: [Bug c++/89056] Optimizer generates bad code for non-void function that fails to return a value
Date: Fri, 25 Jan 2019 00:47:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
In C++ it is undefined what happens when a return happens without a value.
This is different from C. So these returns are marked as calling
__builtin_unreachable().
*** This bug has been marked as a duplicate of bug 86761 ***
>From gcc-bugs-return-630836-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:47:18 2019
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Subject: [Bug c++/86761] Code corruption with missing pointer return
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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CC| |darryl_okahata at keysight dot com
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 89056 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630838-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:49:12 2019
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Subject: [Bug c++/89056] Optimizer generates bad code for non-void function that fails to return a value
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86761#c4 on the differences
between C and C++.
>From gcc-bugs-return-630839-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 00:49:12 2019
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/89052] excessive data segment size causes a hang
Date: Fri, 25 Jan 2019 00:49:00 -0000
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--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I'd say it's a bug for GCC to need to allocate memory for the trailing
zero-initialized part of such an object at all; it should only need to
allocate memory for the initial part and remember that the rest is zero
(and then tell the assembler that the rest is zero, leaving it to the
assembler to fail / try to produce a huge object file / ...).
>From gcc-bugs-return-630840-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 01:16:10 2019
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Subject: [Bug c++/89056] Optimizer generates bad code for non-void function that fails to return a value
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--- Comment #4 from Darryl Okahata <darryl_okahata at keysight dot com> ---
This seems rather draconian but, if the standard allows for that, so be it.
Thanks.
>From gcc-bugs-return-630841-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 01:39:41 2019
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Subject: [Bug fortran/85780] ICE in resolve_fl_procedure, at fortran/resolve.c:12504
Date: Fri, 25 Jan 2019 01:39:00 -0000
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #8 from kargl at gcc dot gnu.org ---
My original patch simply fixed the ICE, which then
allowed the code to compile. In reality, an alternate
return is not ISO C interoperable, so an error message
is a more appropriate response. I have a patch. So,
re-open.
>From gcc-bugs-return-630842-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 01:58:06 2019
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Subject: [Bug c++/89036] [8/9 Regression] ICE if destructor has a requires
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |dmalcolm at gcc dot gnu.org
>From gcc-bugs-return-630843-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 02:13:37 2019
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Subject: [Bug c/89045] [9 Regression] ICE in get_parm_info, at c/c-decl.c:7518
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-25
CC| |dmalcolm at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Confirmed.
It's unexpectedly reaching this case in get_parm_decl with a VAR_DECL:
7513 /* Other things that might be encountered. */
7514 case LABEL_DECL:
7515 case VAR_DECL:
7516 default:
7517 gcc_unreachable ();
(gdb) p *b
$3 = {u = {type = <tree 0x0>, label = 0x0}, decl = <var_decl 0x7ffff7ffbab0>,
id = <tree 0x0>, prev = 0x0, shadowed = 0x0,
depth = 3, invisible = 0, nested = 0, inner_comp = 0, in_struct = 0, locus =
169024}
(gdb) call inform (b->locus, "b->locus")
z1.c: In function ‘f’:
z1.c:3:21: note: b->locus
3 | void g (int [(int){ x }]);
| ^
(gdb) call debug_tree (decl)
<var_decl 0x7ffff7ffbab0 D.1908
type <integer_type 0x7ffff18c65e8 int public SI
size <integer_cst 0x7ffff18aded0 constant 32>
unit-size <integer_cst 0x7ffff18adee8 constant 4>
align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff18c65e8 precision:32 min <integer_cst 0x7ffff18ade88 -2147483648> max
<integer_cst 0x7ffff18adea0 2147483647>
pointer_to_this <pointer_type 0x7ffff18ce9d8>>
used ignored read SI z1.c:3:21 size <integer_cst 0x7ffff18aded0 32>
unit-size <integer_cst 0x7ffff18adee8 4>
align:32 warn_if_not_align:0 context <function_decl 0x7ffff19d9f00 f>
initial <parm_decl 0x7ffff19fa000 x>>
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85780] ICE in resolve_fl_procedure, at fortran/resolve.c:12504
Date: Fri, 25 Jan 2019 02:30:00 -0000
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--- Comment #9 from kargl at gcc dot gnu.org ---
Patch submitted.
https://gcc.gnu.org/ml/fortran/2019-01/msg00236.html
>From gcc-bugs-return-630845-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 04:36:54 2019
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Subject: [Bug c/33719] "#pragma omp for firstprivate(shared_var)" in function labelled 'shared_var' as private
Date: Fri, 25 Jan 2019 04:36:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |jakub at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing openmp maintainer
>From gcc-bugs-return-630846-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 04:39:34 2019
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Subject: [Bug demangler/54254] libiberty: demangling for global constructor is broken since r167781
Date: Fri, 25 Jan 2019 04:39:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |ian at airs dot com
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing libiberty maintainer
>From gcc-bugs-return-630847-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 04:42:05 2019
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Subject: [Bug c++/52202] [C++11][DR 1376] Should not extend lifetime of temporary wrapped in static_cast to reference type
Date: Fri, 25 Jan 2019 04:42:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |jens.maurer at gmx dot net
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to ensadc from comment #2)
> Superseded by issue 1299? See http://wg21.link/p0727.
cc-ing Jens from that
>From gcc-bugs-return-630848-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 05:24:02 2019
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Subject: [Bug middle-end/51677] don't suggest giving main() __attribute__((const))
Date: Fri, 25 Jan 2019 05:24:00 -0000
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--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #4)
> (In reply to Martin Sebor from comment #3)
> > It should be easy to white-list the main function in the
> > -Wsuggest-attribute= checker. At the same time, I'm not sure it's necessary
> > or that the problem is unique to main. The reasons noted in comment #0
> > apply to other functions as well. Defining empty functions is useful for a
> > variety of reasons (e.g., default no-op handlers or, in C++, default no-op
> > implementations of virtual functions). Similarly, without perfect data flow
> > analysis across the whole program it's impossible to tell whether an extern
> > function is ever called. Why should main be treated differently from those?
>
> Because it's an easy first step that doesn't require doing all of those
> extra data flow analyses
Also main() is already treated specially for -Wmain
>From gcc-bugs-return-630849-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 05:32:08 2019
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Subject: [Bug other/58312] libssp configure check for "usable vsnprintf" is broken on cross-compilers.
Date: Fri, 25 Jan 2019 05:32:00 -0000
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--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Brooks Moses from comment #4)
> It turns out that we do need these symbols in libssp despite having a nice
> plain x86-Linux environment. We've got some precompiled blobs from
> who-knows-where that want the "LIBSSP_1.0" version of the __vsnprintf_chk
> symbol -- and, although our glibc exports __vsnprintf_chk, it of course
> exports it with a "GLIBC_2.3.4" version. Failure ensues.
>
> So, for consistency for things that either explicitly declare -lssp or
> otherwise end up with the LIBSSP symbol versions, I think it's nonetheless
> useful to fix the libssp configure file for cross-compilation.
>
> Thus, patch posted:
> http://gcc.gnu.org/ml/gcc-patches/2013-09/msg00174.html
Is that patch still relevant?
>From gcc-bugs-return-630850-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 05:35:22 2019
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/33719] "#pragma omp for firstprivate(shared_var)" in function labelled 'shared_var' as private
Date: Fri, 25 Jan 2019 05:35:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That is a correct diagnostics. The firstprivate is about shared_var itself,
not what it points to, and for firstprivate on the working construct you need a
variable that is shared in the parallel and only privatized in the worksharing
region. Thus for firstprivate on an orphaned worksharing construct the
variable needs to be file scope/namespace scope, or static, or a reference that
binds to a shared variable.
"A list item that is private within a parallel region must not appear in a
firstprivate clause on a worksharing construct if any of the worksharing
regions arising from the worksharing construct ever bind to any of the parallel
regions arising from the parallel construct."
While the value of shared_var may be the same in all threads of a parallel, it
is still private in the parallel, consider what happens if you take the address
of shared_var, different threads will have different addresses. Function
parameters passed by value are like if you do { double *shared_var = something;
... } within parallel region, even if something is a shared variable,
shared_var is a local variable and as such it is predetermined to be private.
Just remove the bogus firstprivate(shared_var) in this case.
Note, if in C++ it is double *&shared_var, then firstprivate(shared_var) might
be ok, it will depend on whether what it binds to is shared or not.
See https://godbolt.org/z/l1v1NF that it is equally rejected by other compilers
too. They don't get the double *&shared_var case right, but properly diagnose
double *shared_var argument.
>From gcc-bugs-return-630851-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 07:49:52 2019
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Subject: [Bug debug/87295] [early debug] ICE with -ffat-lto-objects -fdebug-types-section -g
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Assignee|nathan at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Let me take this bug, looks like we fail to "undo" some effects of the early
write-out.
>From gcc-bugs-return-630852-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 07:51:30 2019
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
Date: Fri, 25 Jan 2019 07:51:00 -0000
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--- Comment #46 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #44)
> Created attachment 45523 [details]
> workaround
>
> So I am testing the following workaround, at least "most suitable" for
> branches.
> It avoids generating affected BIT_FIELD_REFs (with bases with integral types
> that have a precision not matching the size of the mode).
>
> Can arm folks please test this patch and aid me (provide) a dg-torture
> testcase that currently fails?
>
> It builds OK on x86_64-linux, I'll test it with the endianess test commented
> out to see if there's any testsuite fallout.
>
> Thanks.
No regressions on x86_64-linux when also enabling there.
>From gcc-bugs-return-630853-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 08:06:57 2019
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
Date: Fri, 25 Jan 2019 08:06:00 -0000
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--- Comment #47 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Eric Botcazou from comment #45)
> > So to get back to this - my thinking was that for a reference REF I can do
> >
> > base = get_inner_reference (ref, &bitsize, &bitpos, &offset, &mode,
> > &unsignedp, &reversep, &volatilep);
> >
> > and get the semantically same REF building
> >
> > REF' = BIT_FIELD_REF<*(&base + offset), bitsize, bitpos>
> >
> > (plus setting REF_REVERSE_STORAGE_ORDER and TREE_THIS_VOLATILE on REF').
> >
> > This appearantly breaks down (similarly for get_ref_base_and_extent) for
> > bigendian and DECL_BIT_FIELD outer COMPONENT_REFs. And maybe for more?
> >
> > Is my expectation that the above "works" flawed? So "bit position"
> > and "position of the first referenced bit" are two separate things?
>
> No, they are the same, but I think that BIT_FIELD_REF is not supposed to be
> itself applied to a bit-field, as in the case at hand, since it's precisely
> meant to designate a bit-field. In other words, the above base cannot be a
> bit-field.
>
> So the safest route is probably to forbid such an abomination, i.e. to make
> sure that the first argument of BIT_FIELD_REF is a bona-fide base type.
OK, we can certainly try to enforce this. Just to make sure - this
refers to TREE_TYPE (TREE_OPERAND (bfr, 0)), not the base of the
component-ref chain eventually rooted here?
On GIMPLE, if we want to extract some bits from a register that happens to
be a non-"base" type this means we have to use shifting and masking. I
suppose the same issue hits BIT_INSERT_EXPR. This makes it somewhat
awkward (aka non-canonical) on the GIMPLE side :/ The most natural thing
there would then be to disallow such types in the IL. Btw, are
PSImode / int : 24 "bona-fide base types"? Thus, is the criteria that
precision matches TYPE_SIZE? GET_MODE_PRECISION? GET_MODE_BITSIZE?
I know we try to avoid introducing bit-precision ops during GIMPLE
optimization but FEs happily leak those into the IL (as in this testcase).
Just to remind where we're coming from - we have
unData.strMemHead.b30AddrL = ulAddr >> 2;
where this is a 30bit bitfield store (at bit offset % BITS_PER_UNIT == 0)
from a unsigned :30 register. Via the union we now try to load
8 bits from memory contained within that 30 bits and try to extract those
from the unsigned :30 register instead (with the goal to elide the
memory object). In which circumnstances can we view the RHS of the above
store as "proper" for applying the BIT_FIELD_REF as translated to the
LHS memory to the RHS register? Is it enough to constrain the RHS
type to TYPE_PRECISION == TYPE_SIZE? RTL expansion now handles various
cases of handled-component expansion where the base ends up not being
memory but various other kinds of entities - do they run into the same
issue when, for BIT_FIELD_REFs, register bases are not equal to memory
bases? [Just looking at FLOAT_WORD_ORDER and friends and considering the
punning we're happily introducing via the above transform]
>From gcc-bugs-return-630854-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 08:14:13 2019
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Subject: [Bug tree-optimization/86865] [9 Regression] Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse=none -fwrapv -fno-tree-ch -fno-tree-dce -fno-tree-dominator-opts -fno-tree-loop-ivcanon
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Jan 25 08:13:34 2019
New Revision: 268257
URL: https://gcc.gnu.org/viewcvs?rev=268257&root=gcc&view=rev
Log:
2019-01-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/86865
* graphite-scop-detection.c (scop_detection::can_represent_loop):
Reject non-do-while loops.
* gcc.dg/graphite/pr86865.c: New testcase.
* gcc.dg/graphite/pr69728.c: XFAIL.
* gcc.dg/graphite/scop-21.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/graphite/pr86865.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/graphite-scop-detection.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/graphite/pr69728.c
trunk/gcc/testsuite/gcc.dg/graphite/scop-21.c
>From gcc-bugs-return-630855-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 08:31:16 2019
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Subject: [Bug tree-optimization/89043] strcat (strcpy (d, a), b) not folded to stpcpy (strcpy (d, a), b)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug libstdc++/89044] libstdc++-6.dll is installed in the wrong directory cross-compiling with a multilib configuration
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
What GCC version are you building/installing?
>From gcc-bugs-return-630857-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 08:32:18 2019
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Subject: [Bug c/89045] [9 Regression] ICE in get_parm_info, at c/c-decl.c:7518
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>From gcc-bugs-return-630858-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 08:45:47 2019
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Subject: [Bug libstdc++/89044] libstdc++-6.dll is installed in the wrong directory cross-compiling with a multilib configuration
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--- Comment #2 from Andoni <ylatuya at gmail dot com> ---
8.2.0 I updated the version field too.
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Subject: [Bug rtl-optimization/88879] [9 Regression] ICE in sel_target_adjust_priority, at sel-sched.c:3332
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--- Comment #6 from Andrey Belevantsev <abel at gcc dot gnu.org> ---
(In reply to Alexander Monakov from comment #4)
> Thanks. This broke when the patch for PR 85458 was applied, and Andreas
> raised it on the gcc-patches thread:
> https://gcc.gnu.org/ml/gcc-patches/2018-09/msg00128.html
>
> Soon after that, the HP-PA adjust_priority target hook was removed, making
> the sel-sched change unnecessary. Therefore, my recommendation is to revert
> the sel-sched patch, or remove the new assert as Andreas has suggested.
> Andrey, which approach would you prefer?
>
> It's also possible to implement Jeff's suggestion and clamp negative
> priorities to zero in create_speculation_check, but that may turn out to be
> insufficient if there is other code producing negative priority values.
I would try to avoid negative priorities if possible. It looks they could only
come from the adjust_priority hook or from create_speculation_check. If the
former is now impossible then maybe just fix the latter?
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
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--- Comment #48 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> OK, we can certainly try to enforce this. Just to make sure - this
> refers to TREE_TYPE (TREE_OPERAND (bfr, 0)), not the base of the
> component-ref chain eventually rooted here?
Yes, formally it's the former, i.e. the type of operand #0 of BIT_FIELD_REF.
> On GIMPLE, if we want to extract some bits from a register that happens to
> be a non-"base" type this means we have to use shifting and masking. I
> suppose the same issue hits BIT_INSERT_EXPR. This makes it somewhat
> awkward (aka non-canonical) on the GIMPLE side :/
Yes, I think that the handling of BIT_INSERT_EXPR should be symmetrical.
> The most natural thing there would then be to disallow such types in the IL.
Yes, as type of operand #0 of BIT_FIELD_REF/BIT_INSERT_EXPR.
> Btw, are PSImode / int : 24 "bona-fide base types"? Thus, is the criteria
> that precision matches TYPE_SIZE? GET_MODE_PRECISION? GET_MODE_BITSIZE?
> I know we try to avoid introducing bit-precision ops during GIMPLE
> optimization but FEs happily leak those into the IL (as in this testcase).
The predicate type_has_mode_precision_p is the one used by the RTL expander to
identify bit-field types. Moreover it's also already used in a few GIMPLE
optimization passes (fwprop, vrp, vectorize) so it seems to be fit the bill.
So a base type would be (!INTEGRAL_TYPE_P || type_has_mode_precision_p).
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Subject: [Bug tree-optimization/89049] [8/9 Regression] Unexpected vectorization
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-01-25
CC| |hubicka at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
scalar costs for single iteration:
0x322a040 _1 * 4 1 times scalar_stmt costs 12 in body
0x322a040 *_3 1 times scalar_load costs 12 in body
0x322a040 _4 + r_16 1 times scalar_stmt costs 12 in body
single-iteration vector cost:
0x31651e0 *_3 1 times unaligned_load (misalign -1) costs 20 in body
0x31651e0 _4 + r_16 8 times vec_to_scalar costs 32 in body
0x31651e0 _4 + r_16 8 times scalar_stmt costs 96 in body
there's the old issue that we use vec_to_scalar (originally meant to be
used for the vector to scalar conversion in the reduction epilogue only,
thus "free" on x86_64 since you can simply use %xmm0 for element zero)
also for random element extraction.
Besides this it's the usual issue that even if everything else is scalar
the appearant savings by vectorizing the load (12 * 8 scalar vs. 20 vector)
offsets quite a bit of eventual extra mangling (here the 8 vec_to_scalar
operations). Making vec_to_scalar cost the same as a scalar load would
offset those. But then this makes the (few, in epilogue only) real
"free" vec_to_scalar ops expensive.
So
Index: gcc/config/i386/i386.c
===================================================================
--- gcc/config/i386/i386.c (revision 268257)
+++ gcc/config/i386/i386.c (working copy)
@@ -45806,6 +45806,7 @@ ix86_builtin_vectorization_cost (enum ve
case scalar_stmt:
return fp ? ix86_cost->addss : COSTS_N_INSNS (1);
+ case vec_to_scalar:
case scalar_load:
/* load/store costs are relative to register move which is 2. Recompute
it to COSTS_N_INSNS so everything have same base. */
@@ -45834,7 +45835,6 @@ ix86_builtin_vectorization_cost (enum ve
index = 2;
return COSTS_N_INSNS (ix86_cost->sse_store[index]) / 2;
- case vec_to_scalar:
case scalar_to_vec:
return ix86_vec_cost (mode, ix86_cost->sse_op);
but as said this is a hack in the target (needs to be benchmarked if
to be considered). The real issue is that we use both vec_to_scalar
and scalar_to_vec for different things that usually do not have
even similar costs.
Note that even with the above we vectorize the loop because in the
scalar costing we cost the address-generation for the scalar load
but not in the vector case (another discrepancy...). This happens
because we detected a pattern involving this...
t.c:1:35: note: vect_recog_widen_mult_pattern: detected: _2 = _1 * 4;
t.c:1:35: note: widen_mult pattern recognized: patt_7 = (long unsigned int)
patt_13;
I have a fix for that (testing separately). With this fix alone we
still vectorize as well.
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 45531
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45531&action=edit
scalar loop cost patch
I'm testing this patch (not fixing the testcase, just improving costs).
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Subject: [Bug c++/88937] valgrind error in parse_has_include
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
So it's really problem, one can easily see it with:
$ cat x.C
#if __has_include("x")
#endif
$ valgrind --trace-children=yes ./xgcc -B. x.C -c
==22322== Memcheck, a memory error detector
==22322== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==22322== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==22322== Command: ./xgcc -B. x.C -c
==22322==
==22323== Memcheck, a memory error detector
==22323== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==22323== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==22323== Command: ./cc1plus -quiet -iprefix
/dev/shm/objdir/gcc/../lib64/gcc/x86_64-pc-linux-gnu/9.0.1/ -isystem ./include
-isystem ./include-fixed -D_GNU_SOURCE x.C -quiet -dumpbase x.C -mtune=generic
-march=x86-64 -auxbase x -o /tmp/ccBLUwdo.s
==22323==
==22323== Conditional jump or move depends on uninitialised value(s)
==22323== at 0x18F99FA: parse_has_include(cpp_reader*, include_type)
(expr.c:2247)
==22323== by 0x18F6E81: eval_token(cpp_reader*, cpp_token const*, unsigned
int) (expr.c:1157)
==22323== by 0x18F717D: _cpp_parse_expr (expr.c:1328)
==22323== by 0x18F110C: do_if(cpp_reader*) (directives.c:2008)
==22323== by 0x18F27CA: _cpp_handle_directive (directives.c:543)
==22323== by 0x1901994: _cpp_lex_token (lex.c:2609)
==22323== by 0x19091D9: cpp_get_token_1(cpp_reader*, unsigned int*)
(macro.c:2703)
==22323== by 0x190964C: cpp_get_token_with_location(cpp_reader*, unsigned
int*) (macro.c:2889)
==22323== by 0xA9496E: c_lex_with_flags(tree_node**, unsigned int*, unsigned
char*, int) (c-lex.c:405)
==22323== by 0x95549E: cp_lexer_get_preprocessor_token(cp_lexer*, cp_token*)
(parser.c:788)
==22323== by 0x9925F7: cp_parser_initial_pragma (parser.c:40586)
==22323== by 0x9925F7: cp_lexer_new_main (parser.c:642)
==22323== by 0x9925F7: cp_parser_new (parser.c:3933)
==22323== by 0x9925F7: c_parse_file() (parser.c:41027)
==22323== by 0xA9E670: c_common_parse_file() (c-opts.c:1155)
==22323==
==22323== Conditional jump or move depends on uninitialised value(s)
==22323== at 0x18F7408: _cpp_parse_expr (expr.c:1429)
==22323== by 0x18F110C: do_if(cpp_reader*) (directives.c:2008)
==22323== by 0x18F27CA: _cpp_handle_directive (directives.c:543)
==22323== by 0x1901994: _cpp_lex_token (lex.c:2609)
==22323== by 0x19091D9: cpp_get_token_1(cpp_reader*, unsigned int*)
(macro.c:2703)
==22323== by 0x190964C: cpp_get_token_with_location(cpp_reader*, unsigned
int*) (macro.c:2889)
==22323== by 0xA9496E: c_lex_with_flags(tree_node**, unsigned int*, unsigned
char*, int) (c-lex.c:405)
==22323== by 0x95549E: cp_lexer_get_preprocessor_token(cp_lexer*, cp_token*)
(parser.c:788)
==22323== by 0x9925F7: cp_parser_initial_pragma (parser.c:40586)
==22323== by 0x9925F7: cp_lexer_new_main (parser.c:642)
==22323== by 0x9925F7: cp_parser_new (parser.c:3933)
==22323== by 0x9925F7: c_parse_file() (parser.c:41027)
==22323== by 0xA9E670: c_common_parse_file() (c-opts.c:1155)
==22323== by 0xF55A8E: compile_file() (toplev.c:456)
==22323== by 0x856C19: do_compile (toplev.c:2176)
==22323== by 0x856C19: toplev::main(int, char**) (toplev.c:2311)
When putting following breakpoint:
(gdb) b expr.c:2218
you'll see:
$ (gdb) p token->val
$2 = {
node = {
node = 0x3,
spelling = 0x254eedc
},
source = 0x3,
str = {
len = 3,
text = 0x254eedc "\"x\""
},
macro_arg = {
arg_no = 3,
spelling = 0x254eedc
},
token_no = 3,
pragma = 3
}
so val.str is used from the union. Thus one shouldn't use
node = token->val.node.node;
that will be 0x03. Later than the pointer is saved here:
/* A possible controlling macro of the form #if !__has_include__ ().
_cpp_parse_expr checks there was no other junk on the line. */
if (node)
pfile->mi_ind_cmacro = node;
David will you please take a look?
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What |Removed |Added
----------------------------------------------------------------------------
CC| |3dw4rd at verizon dot net,
| |nathan at gcc dot gnu.org
Target Milestone|--- |9.0
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
CC'ing author of the commit and Nathan.
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
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--- Comment #49 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Just to remind where we're coming from - we have
>
> unData.strMemHead.b30AddrL = ulAddr >> 2;
>
> where this is a 30bit bitfield store (at bit offset % BITS_PER_UNIT == 0)
> from a unsigned :30 register. Via the union we now try to load
> 8 bits from memory contained within that 30 bits and try to extract those
> from the unsigned :30 register instead (with the goal to elide the
> memory object). In which circumnstances can we view the RHS of the above
> store as "proper" for applying the BIT_FIELD_REF as translated to the
> LHS memory to the RHS register?
I think that type_has_mode_precision_p would work and presumably not pessimize
too much even on little-endian platforms.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89049
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
In the assembly I notice
vinsertf128 $0x1, 16(%rdi), %ymm4, %ymm2
...
vextractf128 $0x1, %ymm2, %xmm1
somehow we fail to elide the initial %ymm2 build with the upper half
extraction being the only use... possibly because it has a memory
operand?
>From gcc-bugs-return-630867-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 09:27:57 2019
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Subject: [Bug tree-optimization/89049] [8/9 Regression] Unexpected vectorization
Date: Fri, 25 Jan 2019 09:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89049
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
With -mtune=core-avx2 we do
vmovups (%rdi), %xmm1
vmovups (%rdi), %ymm3
...
vextractf128 $0x1, %ymm3, %xmm1
with -mtune=intel the even more weird
vmovups (%rdi), %xmm1
addq $32, %rdi
vmovups -32(%rdi), %ymm3
...
vextractf128 $0x1, %ymm3, %xmm1
I guess at runtime the vectorized variant isn't so much worse if not
because of the loop size growth. So an additional "weight" we could
put into the generic vectorizer cost metric would be the number of
stmts generated - that is, computing an effective unroll factor and
applying unroll limits to that. In this case we'd do 8-times unrolling
(resulting loop body is twice as large compared to 8-unrolled scalar code).
>From gcc-bugs-return-630868-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 09:37:23 2019
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Subject: [Bug tree-optimization/89049] [8/9 Regression] Unexpected vectorization
Date: Fri, 25 Jan 2019 09:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89049
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
So combine can see
(insn 11 10 13 3 (set (reg:V8SF 105)
(vec_concat:V8SF (reg:V4SF 106 [ MEM[base: _2, offset: 0B] ])
(mem:V4SF (plus:DI (reg:DI 85 [ ivtmp.11 ])
(const_int 16 [0x10])) [1 MEM[base: _2, offset: 0B]+16 S16
A32]))) "t.c":1:72 5046 {avx_vec_concatv8sf}
(nil))
with its uses
(insn 13 11 14 3 (set (reg:V4SF 107)
(vec_select:V4SF (reg:V8SF 105)
(parallel [
(const_int 0 [0])
(const_int 1 [0x1])
(const_int 2 [0x2])
(const_int 3 [0x3])
]))) 2702 {vec_extract_lo_v8sf}
(nil))
(insn 25 24 26 3 (set (reg:V4SF 111)
(vec_select:V4SF (reg:V8SF 105)
(parallel [
(const_int 4 [0x4])
(const_int 5 [0x5])
(const_int 6 [0x6])
(const_int 7 [0x7])
]))) 2711 {vec_extract_hi_v8sf}
(expr_list:REG_DEAD (reg:V8SF 105)
(nil)))
but somehow it only tries 11 -> 13:
Trying 11 -> 13:
11: r105:V8SF=vec_concat(r106:V4SF,[r85:DI+0x10])
REG_DEAD r106:V4SF
13: r107:V4SF=vec_select(r105:V8SF,parallel)
...
Successfully matched this instruction:
(set (reg:V8SF 105)
(vec_concat:V8SF (reg:V4SF 106 [ MEM[base: _2, offset: 0B] ])
(mem:V4SF (plus:DI (reg:DI 85 [ ivtmp.11 ])
(const_int 16 [0x10])) [1 MEM[base: _2, offset: 0B]+16 S16
A32])))
Successfully matched this instruction:
(set (reg:V4SF 107)
(reg:V4SF 106 [ MEM[base: _2, offset: 0B] ]))
allowing combination of insns 11 and 13
original costs 4 + 4 = 8
replacement costs 4 + 4 = 8
modifying insn i2 11: r105:V8SF=vec_concat(r106:V4SF,[r85:DI+0x10])
deferring rescan insn with uid = 11.
modifying insn i3 13: r107:V4SF=r106:V4SF
REG_DEAD r106:V4SF
then it continues:
Trying 11 -> 25:
11: r105:V8SF=vec_concat(r106:V4SF,[r85:DI+0x10])
25: r111:V4SF=vec_select(r105:V8SF,parallel)
REG_DEAD r105:V8SF
Successfully matched this instruction:
(set (reg:V4SF 111)
(mem:V4SF (plus:DI (reg:DI 85 [ ivtmp.11 ])
(const_int 16 [0x10])) [1 MEM[base: _2, offset: 0B]+16 S16 A32]))
rejecting combination of insns 11 and 25
original costs 4 + 4 = 8
replacement cost 12
where it rejects this for some reason... I think the cost of 4
assigned to 11 is bogus here (maybe combine uses wrong costs, not
accounting for embedded MEMs?)
>From gcc-bugs-return-630869-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 09:38:22 2019
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Subject: [Bug target/89057] New: GCC 7->8 regression: ARM(64) ld3 st4 less optimized
Date: Fri, 25 Jan 2019 09:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89057
Bug ID: 89057
Summary: GCC 7->8 regression: ARM(64) ld3 st4 less optimized
Product: gcc
Version: unknown
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Severity: normal
Priority: P3
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When using the vld3_u8 and vst4_u8 instrinsics, the code generated with gcc8 is
less efficient than the code generated with gcc7. One has 3 moves, and the
other 9 moves.
The code in question is:
#include <stdint.h>
#include <arm_neon.h>
void qt_convert_rgb888_to_rgb32_neon(unsigned *dst, const unsigned char *src,
int len)
{
if (!len)
return;
const unsigned *const end = dst + len;
// align dst on 64 bits
const int offsetToAlignOn8Bytes = (reinterpret_cast<uintptr_t>(dst) >> 2) &
0x1;
for (int i = 0; i < offsetToAlignOn8Bytes; ++i) {
*dst++ = 0xff000000 | (src[0] << 16) | (src[1] << 8) | src[2];
src += 3;
}
if ((len - offsetToAlignOn8Bytes) >= 8) {
const unsigned *const simdEnd = end - 7;
// non-inline asm version (uses more moves)
uint8x8x4_t dstVector;
dstVector.val[3] = vdup_n_u8(0xff);
do {
uint8x8x3_t srcVector = vld3_u8(src);
src += 3 * 8;
dstVector.val[0] = srcVector.val[2];
dstVector.val[1] = srcVector.val[1];
dstVector.val[2] = srcVector.val[0];
vst4_u8((uint8_t*)dst, dstVector);
dst += 8;
} while (dst < simdEnd);
}
while (dst != end) {
*dst++ = 0xff000000 | (src[0] << 16) | (src[1] << 8) | src[2];
src += 3;
}
}
With gcc 7.3 the inner loop is:
.L5:
ld3 {v4.8b - v6.8b}, [x1]
add x1, x1, 24
orr v3.16b, v7.16b, v7.16b
mov v0.8b, v6.8b
mov v1.8b, v5.8b
mov v2.8b, v4.8b
st4 {v0.8b - v3.8b}, [x0]
add x0, x0, 32
cmp x3, x0
bhi .L5
With gcc 8.2 the inner loop is:
.L5:
ld3 {v4.8b - v6.8b}, [x1]
adrp x3, .LC1
add x1, x1, 24
ldr q3, [x3, #:lo12:.LC1]
mov v16.8b, v6.8b
mov v7.8b, v5.8b
mov v4.8b, v4.8b
ins v16.d[1], v17.d[0]
ins v7.d[1], v17.d[0]
ins v4.d[1], v17.d[0]
mov v0.16b, v16.16b
mov v1.16b, v7.16b
mov v2.16b, v4.16b
st4 {v0.8b - v3.8b}, [x0]
add x0, x0, 32
cmp x2, x0
bhi .L5
>From gcc-bugs-return-630870-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 09:39:01 2019
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Subject: [Bug target/89058] New: GCC 7->8 regression: ARM(64) ld3 st4 less optimized
Date: Fri, 25 Jan 2019 09:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89058
Bug ID: 89058
Summary: GCC 7->8 regression: ARM(64) ld3 st4 less optimized
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
When using the vld3_u8 and vst4_u8 instrinsics, the code generated with gcc8 is
less efficient than the code generated with gcc7. One has 3 moves, and the
other 9 moves.
The code in question is:
#include <stdint.h>
#include <arm_neon.h>
void qt_convert_rgb888_to_rgb32_neon(unsigned *dst, const unsigned char *src,
int len)
{
if (!len)
return;
const unsigned *const end = dst + len;
// align dst on 64 bits
const int offsetToAlignOn8Bytes = (reinterpret_cast<uintptr_t>(dst) >> 2) &
0x1;
for (int i = 0; i < offsetToAlignOn8Bytes; ++i) {
*dst++ = 0xff000000 | (src[0] << 16) | (src[1] << 8) | src[2];
src += 3;
}
if ((len - offsetToAlignOn8Bytes) >= 8) {
const unsigned *const simdEnd = end - 7;
// non-inline asm version (uses more moves)
uint8x8x4_t dstVector;
dstVector.val[3] = vdup_n_u8(0xff);
do {
uint8x8x3_t srcVector = vld3_u8(src);
src += 3 * 8;
dstVector.val[0] = srcVector.val[2];
dstVector.val[1] = srcVector.val[1];
dstVector.val[2] = srcVector.val[0];
vst4_u8((uint8_t*)dst, dstVector);
dst += 8;
} while (dst < simdEnd);
}
while (dst != end) {
*dst++ = 0xff000000 | (src[0] << 16) | (src[1] << 8) | src[2];
src += 3;
}
}
With gcc 7.3 the inner loop is:
.L5:
ld3 {v4.8b - v6.8b}, [x1]
add x1, x1, 24
orr v3.16b, v7.16b, v7.16b
mov v0.8b, v6.8b
mov v1.8b, v5.8b
mov v2.8b, v4.8b
st4 {v0.8b - v3.8b}, [x0]
add x0, x0, 32
cmp x3, x0
bhi .L5
With gcc 8.2 the inner loop is:
.L5:
ld3 {v4.8b - v6.8b}, [x1]
adrp x3, .LC1
add x1, x1, 24
ldr q3, [x3, #:lo12:.LC1]
mov v16.8b, v6.8b
mov v7.8b, v5.8b
mov v4.8b, v4.8b
ins v16.d[1], v17.d[0]
ins v7.d[1], v17.d[0]
ins v4.d[1], v17.d[0]
mov v0.16b, v16.16b
mov v1.16b, v7.16b
mov v2.16b, v4.16b
st4 {v0.8b - v3.8b}, [x0]
add x0, x0, 32
cmp x2, x0
bhi .L5
>From gcc-bugs-return-630872-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 09:42:40 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/89058] GCC 7->8 regression: ARM(64) ld3 st4 less optimized
Date: Fri, 25 Jan 2019 09:42:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |ktkachov at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #1 from ktkachov at gcc dot gnu.org ---
Dup.
*** This bug has been marked as a duplicate of bug 89057 ***
>From gcc-bugs-return-630871-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 09:42:02 2019
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-25
Ever confirmed|0 |1
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
>
> Would extracting another example be useful here?
No, but thank you for the report.
Note that bintuils has recently documented that:
commit 6406a2701bda7437e879bff026adc8a5a94e87ff (HEAD, origin/master,
origin/HEAD)
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Mon Jan 14 08:30:19 2019 +0100
ld: Add LTO warning to --wrap documentation
ld/
* ld.texi (--wrap): Add warning that LTO may make this feature
ineffective.
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Subject: [Bug target/89057] GCC 7->8 regression: ARM(64) ld3 st4 less optimized
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--- Comment #1 from ktkachov at gcc dot gnu.org ---
*** Bug 89058 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630874-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 09:43:42 2019
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Subject: [Bug target/89057] GCC 7->8 regression: ARM(64) ld3 st4 less optimized
Date: Fri, 25 Jan 2019 09:43:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |aarch64
Status|UNCONFIRMED |NEW
Known to work| |7.4.1
Version|unknown |8.2.1
Keywords| |missed-optimization
Last reconfirmed| |2019-01-25
CC| |ktkachov at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |8.2.1, 9.0
--- Comment #2 from ktkachov at gcc dot gnu.org ---
Confirmed.
>From gcc-bugs-return-630875-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 09:45:10 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/89049] [8/9 Regression] Unexpected vectorization
Date: Fri, 25 Jan 2019 09:45:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC|segher at gcc dot gnu.org |
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
From a quick look rtx_cost should end up recursing to the MEM. Oh.
targetm.rtx_costs is expected to handle sub-costs but does
case VEC_SELECT:
case VEC_CONCAT:
case VEC_DUPLICATE:
/* ??? Assume all of these vector manipulation patterns are
recognizable. In which case they all pretty much have the
same cost. */
*total = cost->sse_op;
return true;
which is of course bogus for patterns involving MEMs (new possibility with
AVX). Not combines issue.
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From: "sebastian.huber@embedded-brains.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/88643] -Wl,--wrap not supported with LTO
Date: Fri, 25 Jan 2019 09:48:00 -0000
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--- Comment #5 from Sebastian Huber <sebastian.huber@embedded-brains.de> ---
I think the basic problem is that the LD --wrap feature works only with
undefined symbols references and not relocations:
See also:
https://www.sourceware.org/ml/binutils/2019-01/msg00204.html
>From gcc-bugs-return-630877-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:02:58 2019
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Subject: [Bug gcov-profile/89046] GCOV generates incorrect results for C++ Lambda / Constructor
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Thanks for the report, it's fixed.
*** This bug has been marked as a duplicate of bug 86109 ***
>From gcc-bugs-return-630878-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:03:12 2019
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Subject: [Bug gcov-profile/86109] gcov reports lines in lambdas as not executable
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |boazstud at yahoo dot com
--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
*** Bug 89046 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630879-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:03:24 2019
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #45523|0 |1
is obsolete| |
--- Comment #50 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 45532
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45532&action=edit
adjusted patch
This adjusts the workaround to use type_has_mode_precision_p on all targets.
It also includes IL verification (definitely not to be backported).
As of pessimizing cases it's merely cases like the testcase where we might
fail to elide a memory object that is initialized only via
!type_has_mode_precision_p stores but read in byte-size chunks.
The existing VN trick for unknown reason limits itself to
multiples of BITS_PER_UNIT sized accesses in addition to the
check that somewhat resembles type_has_mode_precision_p but applied
to the load we want to elide given other constraints on the BIT_FIELD_REF IL.
We may want to elide the multiple_p (ref->size, BITS_PER_UNIT) check for GCC
10.
>From gcc-bugs-return-630881-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:13:31 2019
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Subject: [Bug tree-optimization/86865] [9 Regression] Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse=none -fwrapv -fno-tree-ch -fno-tree-dce -fno-tree-dominator-opts -fno-tree-loop-ivcanon
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|9.0 |8.3
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk and GCC8 branch.
>From gcc-bugs-return-630882-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:13:32 2019
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Subject: [Bug tree-optimization/59859] [meta-bug] GRAPHITE issues
Date: Fri, 25 Jan 2019 10:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59859
Bug 59859 depends on bug 86865, which changed state.
Bug 86865 Summary: [9 Regression] Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse=none -fwrapv -fno-tree-ch -fno-tree-dce -fno-tree-dominator-opts -fno-tree-loop-ivcanon
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86865
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-630880-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:13:14 2019
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Subject: [Bug tree-optimization/86865] [9 Regression] Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse=none -fwrapv -fno-tree-ch -fno-tree-dce -fno-tree-dominator-opts -fno-tree-loop-ivcanon
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86865
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Jan 25 10:12:37 2019
New Revision: 268260
URL: https://gcc.gnu.org/viewcvs?rev=268260&root=gcc&view=rev
Log:
2019-01-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/86865
* graphite-scop-detection.c (scop_detection::can_represent_loop):
Reject non-do-while loops.
* gcc.dg/graphite/pr86865.c: New testcase.
* gcc.dg/graphite/pr69728.c: XFAIL.
* gcc.dg/graphite/scop-21.c: Likewise.
libgomp/
* testsuite/libgomp.graphite/force-parallel-5.c: XFAIL.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.dg/graphite/pr86865.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/graphite-scop-detection.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/testsuite/gcc.dg/graphite/pr69728.c
branches/gcc-8-branch/gcc/testsuite/gcc.dg/graphite/scop-21.c
branches/gcc-8-branch/libgomp/ChangeLog
branches/gcc-8-branch/libgomp/testsuite/libgomp.graphite/force-parallel-5.c
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Subject: [Bug libstdc++/89044] libstdc++-6.dll is installed in the wrong directory cross-compiling with a multilib configuration
Date: Fri, 25 Jan 2019 10:17:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't understand how "gcc with multilib support for linux" can produce .dll
files, so I don't understand what you're doing.
Please provide the full configure command (which is shown in the output of 'gcc
-v' which https://gcc.gnu.org/bugs asks you to provide).
If you're cross-compiling, we need to know the build and host triplets as well
as the target.
>From gcc-bugs-return-630884-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:23:18 2019
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Subject: [Bug c++/89056] Optimizer generates bad code for non-void function that fails to return a value
Date: Fri, 25 Jan 2019 10:23:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, it allows it. It's undefined behaviour for your code to reach the end of
the function (because there's no return statement) so the compiler assumes that
the function will never reach that point. That means the loop must keep going
(only exiting if one of the expressions in the loop throws an exception).
If that's what you intended, then you can mark the function with the noreturn
attribute to inform the compiler of your intention, or you can explicitly add
__builtin_unreachable() at the end of the function. Either of those will
suppress the warning.
Of course that's not what you intended here, so you should heed the warning and
fix the code.
>From gcc-bugs-return-630885-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:31:21 2019
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Subject: [Bug c++/89055] wrong location with predefined macros
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-25
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Subject: [Bug c++/89053] initializer-string too long for a large char array initialized with empty string
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's failed this way since at least GCC 4.3.6
>From gcc-bugs-return-630887-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 10:47:38 2019
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From: "ylatuya at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/89044] libstdc++-6.dll is installed in the wrong directory cross-compiling with a multilib configuration
Date: Fri, 25 Jan 2019 10:47:00 -0000
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--- Comment #4 from Andoni <ylatuya at gmail dot com> ---
I am sorry for now explaining my self good enough. I am building a GCC
toolchain for Windows: a cross-compiler one with Linux as host and a native one
with Windows as host. Both toolchains are built in a Linux machine
Host:Linux Target:Windows
../configure --prefix /home/andoni/mingw/linux/multilib --libdir
/home/andoni/mingw/linux/multilib/lib --disable-maintainer-mode
--disable-silent-rules --disab le-gtk-doc --disable-introspection
--with-host-libstdcxx=-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm
--disable-maintainer-mode--disable-shared --disable-libgomp
--disable-libquadmath --disable-libquadmath-support --disable-libmudflap
--disable-libmpx --disable-libssp --disable-nls --enable-threads=posix
--enable-__cxa_atexit --enable-lto --enable-plugin --enable-multiarch
--enable-languages=c,c++ --enable-long-long
--with-sysroot=/home/andoni/mingw/linux/multilib/x86_64-w64-mingw32/sysroot
--with-local-prefix=/home/andoni/mingw/linux/multilib/x86_64-w64-mingw32/sysroot
--target=x86_64-w64-mingw32 --host=x86_64-pc-linux-gnu
Host:Windows Target:Windows
../configure --prefix /home/andoni/mingw/windows/multilib --libdir
/home/andoni/mingw/windows/multilib/lib --disable-maintainer-mode
--disable-silent-rules --disab le-gtk-doc --disable-introspection
--with-host-libstdcxx=-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm
--disable-maintainer-mode--disable-shared --disable-libgomp
--disable-libquadmath --disable-libquadmath-support --disable-libmudflap
--disable-libmpx --disable-libssp --disable-nls --enable-threads=posix
--enable-__cxa_atexit --enable-lto --enable-plugin --enable-multiarch
--enable-languages=c,c++ --enable-long-long
--with-sysroot=/home/andoni/mingw/windows/multilib/x86_64-w64-mingw32/sysroot
--with-local-prefix=/home/andoni/mingw/windows/multilib/x86_64-w64-mingw32/sysroot
--target=x86_64-w64-mingw32 --host=x86_64-w64-mingw32
When cross-compiling the Windows toolchain, libstdc++-6.dll should be installed
in lib/ and lib32/ instead of bin, in a similar fashion as the EH dll's, that
are installed in lib/libgcc_s_seh-1.dll and lib32/libgcc_s_sjlj-1.dll.
Being installed in bin, the x86_64 one is overridden during make install and
there is a single dll for x86 installed in bin/
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/89059] New: Once we emit switchconf tables, we don't optimize them anymore
Date: Fri, 25 Jan 2019 11:10:00 -0000
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Bug ID: 89059
Summary: Once we emit switchconf tables, we don't optimize them
anymore
Product: gcc
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Severity: normal
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For the following testcase:
static inline int
foo (int a)
{
switch (a)
{
case 0:
return 0;
case 1 ... 3:
return 1;
case 4 ... 10:
return -1;
default:
return 42;
}
}
int
bar (int a)
{
if (a < 0 || a > 3)
__builtin_unreachable ();
return foo (a);
}
we emit unnecessary code, I understand we want to run switchconf early, so that
inliner can already see simple code, but in this case we don't know value
ranges of the switch condition. So, I wonder if we couldn't mark the CSWTCH
tables with some attribute or whatever and in late GIMPLE reconsider if we
can't emit something simpler, whether it is a bit test or simple comparison.
If we commit to a bit test, I wonder if we are able to simplify it later too.
>From gcc-bugs-return-630889-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 11:20:12 2019
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Subject: [Bug c++/89038] #pragma GCC diagnostic ignored "-Wunknown-pragmas" does not work
Date: Fri, 25 Jan 2019 11:20:00 -0000
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--- Comment #3 from Maxim Ivanov <ulidtko at gmail dot com> ---
(In reply to Eric Gallager from comment #2)
> I think this is a dup of something but I can't remember the bug number right
> now; I'll search harder later...
Eric, take a look at bug #53431, I think that's what you meant. It's a pretty
similar report about in-source pragmas not working in C++.
Further, that thread contains a WIP patch from Manuel López-Ibáñez, which he
expressly abandoned while encouraging others to finish and merge it.
P.S.
I do harbor a hope to resolve this on my own, once I accumulate the necessary
courage to allocate some time for a little GCC contribution. That's why I'm
reporting a separate issue knowing it's a duplicate :)
>From gcc-bugs-return-630890-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 11:26:05 2019
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Subject: [Bug tree-optimization/89059] Once we emit switchconf tables, we don't optimize them anymore
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed! Clang has the same problem. We at least fold away the guard check.
How did you come to it Jakub?
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Subject: [Bug tree-optimization/89060] New: Improve tail call optimization
Date: Fri, 25 Jan 2019 11:33:00 -0000
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Bug ID: 89060
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void qux (char *);
int baz (void);
int
foo (void)
{
char buf[64];
qux (buf);
return baz ();
}
int
bar (void)
{
{
char buf[64];
qux (buf);
}
return baz ();
}
While we must not tail call optimize the baz call in foo, because an address of
a local variable escapes and it could be live during the tail call, in bar we
don't tail call optimize it either, but we should.
The IL difference in *.tailc between foo and bar is:
char buf[64];
int _5;
<bb 2> [local count: 1073741824]:
qux (&buf);
+ buf ={v} {CLOBBER};
_5 = baz ();
- buf ={v} {CLOBBER};
return _5;
Right now, we just do:
/* Make sure the tail invocation of this function does not indirectly
refer to local variables. (Passing variables directly by value
is OK.) */
FOR_EACH_LOCAL_DECL (cfun, idx, var)
{
if (TREE_CODE (var) != PARM_DECL
&& auto_var_in_fn_p (var, cfun->decl)
&& may_be_aliased (var)
&& (ref_maybe_used_by_stmt_p (call, var)
|| call_may_clobber_ref_p (call, var)))
return;
}
Perhaps we could record all these variables in a bitmap and if there are any,
perform a variable life analysis like cfgexpand.c does to determine variable
conflicts or what has been discussed for PR86214, and if we can prove that
those variables escaped, but are not live at the point of the tail call, we
could still tail call optimize this.
>From gcc-bugs-return-630892-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 11:43:07 2019
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Subject: [Bug tree-optimization/88739] [7/8/9 Regression] Big-endian union bug
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--- Comment #51 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
FWIW, the (In reply to Richard Biener from comment #44)
> Created attachment 45523 [details]
> workaround
>
> So I am testing the following workaround, at least "most suitable" for
> branches.
> It avoids generating affected BIT_FIELD_REFs (with bases with integral types
> that have a precision not matching the size of the mode).
>
> Can arm folks please test this patch and aid me (provide) a dg-torture
> testcase that currently fails?
It passed testing on aarch64-linux-gnu (LE) and aarch64_be-elf.
>From gcc-bugs-return-630893-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 11:55:32 2019
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Subject: [Bug tree-optimization/89059] Once we emit switchconf tables, we don't optimize them anymore
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ulrich (CCed) reported that.
If the __builtin_unreachable hint is inside of foo, we do optimize it properly.
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Subject: [Bug target/89058] GCC 7->8 regression: ARM(64) ld3 st4 less optimized
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--- Comment #2 from Allan Jensen <linux at carewolf dot com> ---
Oops, sorry.
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Subject: [Bug fortran/88649] runtime error: load of value 137971008, which is not a valid value for type 'gfc_intrinsic_op'
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Minimal test-case:
$ cat r.f90
a = 3 .XOR. 5
end
$ ./xgcc -B. r.f90 -c -fdec
../../gcc/fortran/resolve.c:4148:23: runtime error: load of value 138343072,
which is not a valid value for type 'gfc_intrinsic_op'
#0 0xb1797f in resolve_operator ../../gcc/fortran/resolve.c:4148
#1 0xb34835 in gfc_resolve_expr(gfc_expr*) ../../gcc/fortran/resolve.c:6847
#2 0xb66561 in gfc_resolve_code(gfc_code*, gfc_namespace*)
../../gcc/fortran/resolve.c:11291
#3 0xba15d8 in resolve_codes ../../gcc/fortran/resolve.c:16737
#4 0xba17df in gfc_resolve(gfc_namespace*)
../../gcc/fortran/resolve.c:16772
#5 0xad4ae4 in resolve_all_program_units ../../gcc/fortran/parse.c:6073
#6 0xad5dd6 in gfc_parse_file() ../../gcc/fortran/parse.c:6323
#7 0xc3b836 in gfc_be_parse_file ../../gcc/fortran/f95-lang.c:204
#8 0x2309950 in compile_file ../../gcc/toplev.c:456
#9 0x2310e4b in do_compile ../../gcc/toplev.c:2176
#10 0x2311479 in toplev::main(int, char**) ../../gcc/toplev.c:2311
#11 0x46926ce in main ../../gcc/main.c:39
#12 0x7ffff608cfea in __libc_start_main ../csu/libc-start.c:308
#13 0x875bd9 in _start
(/home/marxin/Programming/gcc2/objdir/gcc/f951+0x875bd9)
Let me try to fix it.
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Subject: [Bug fortran/88649] runtime error: load of value 137971008, which is not a valid value for type 'gfc_intrinsic_op'
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
I've got a patch candidate for it, am testing that.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87295] [early debug] ICE with -ffat-lto-objects -fdebug-types-section -g
Date: Fri, 25 Jan 2019 12:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87295
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
The odd thing I see is that we have two type DIEs with the same signature
(but different members).
DIE 0: DW_TAG_compile_unit (0x7ffff68960a0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_producer: "GNU C++17 9.0.1 20190125 (experimental) [trunk revision
268137] -flto -ffat-lto-objects -fdebug-types-section -g -std=gnu++17"
DW_AT_language: 4
DW_AT_name: "t.ii"
DW_AT_comp_dir: "/abuild/rguenther/trunk2-g/gcc"
DIE 0: DW_TAG_structure_type (0x7ffff6896820)
abbrev id: 0 offset: 0 mark: 0
signature: 2e365acce74a6a1f
DW_AT_name: "integral_constant<bool, false>"
DW_AT_signature: die -> signature: 2e365acce74a6a1f (0x7ffff68962d0)
DW_AT_declaration: 1
DIE 0: DW_TAG_member (0x7ffff6896320)
abbrev id: 0 offset: 0 mark: 0
DW_AT_name: "value"
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 4
DW_AT_decl_column: 24
DW_AT_type: die -> 0 (0x7ffff68963c0)
DW_AT_external: 1
DW_AT_declaration: 1
DW_AT_const_expr: 1
DW_AT_inline: 1
DIE 0: DW_TAG_subprogram (0x7ffff68964b0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
DW_AT_name: "operator integral_constant<bool, false>::value_type"
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 6
DW_AT_decl_column: 13
DW_AT_linkage_name: "_ZNK17integral_constantIbLb0EEcvbEv"
DW_AT_type: die -> 0 (0x7ffff6896a00)
DW_AT_declaration: 1
...
DIE 0: DW_TAG_structure_type (0x7ffff6896a50)
abbrev id: 0 offset: 0 mark: 0
DW_AT_name: "integral_constant<bool, false>"
DW_AT_signature: die -> signature: 2e365acce74a6a1f (0x7ffff68962d0)
DW_AT_declaration: 1
DIE 0: DW_TAG_typedef (0x7ffff6896a00)
abbrev id: 0 offset: 0 mark: 0
DW_AT_name: "value_type"
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 5
DW_AT_decl_column: 15
DW_AT_type: die -> 0 (0x7ffff6896aa0)
but the DW_AT_signature of the first one gets somehow mangled.
So the "duplicate" is because originally it looks like
DIE 0: DW_TAG_structure_type (0x7ffff68962d0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_name: "integral_constant<bool, false>"
DW_AT_byte_size: 1
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 2
DW_AT_decl_column: 8
DIE 0: DW_TAG_member (0x7ffff6896320)
abbrev id: 0 offset: 0 mark: 0
DW_AT_name: "value"
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 4
DW_AT_decl_column: 24
DW_AT_type: die -> 0 (0x7ffff68963c0)
DW_AT_external: 1
DW_AT_declaration: 1
DW_AT_const_expr: 1
DW_AT_inline: 1
DIE 0: DW_TAG_typedef (0x7ffff6896460)
abbrev id: 0 offset: 0 mark: 0
DW_AT_name: "value_type"
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 5
DW_AT_decl_column: 15
DW_AT_type: die -> 0 (0x7ffff6896370)
DIE 0: DW_TAG_subprogram (0x7ffff68964b0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
DW_AT_name: "operator integral_constant<bool, false>::value_type"
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 6
DW_AT_decl_column: 13
DW_AT_type: die -> 0 (0x7ffff6896460)
DW_AT_declaration: 1
DW_AT_object_pointer: die -> 0 (0x7ffff6896500)
DIE 0: DW_TAG_formal_parameter (0x7ffff6896500)
abbrev id: 0 offset: 0 mark: 0
DW_AT_type: die -> 0 (0x7ffff6896550)
DW_AT_artificial: 1
and we duplicate this out to
DIE 0: DW_TAG_structure_type (0x7ffff6896820)
abbrev id: 0 offset: 0 mark: 1
signature: 2e365acce74a6a1f
DW_AT_name: "integral_constant<bool, false>"
DW_AT_signature: die -> signature: 2e365acce74a6a1f (0x7ffff68962d0)
DW_AT_declaration: 1
DIE 0: DW_TAG_member (0x7ffff6896320)
abbrev id: 0 offset: 0 mark: 1
DW_AT_name: "value"
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 4
DW_AT_decl_column: 24
DW_AT_type: die -> 0 (0x7ffff68963c0)
DW_AT_external: 1
DW_AT_declaration: 1
DW_AT_const_expr: 1
DW_AT_inline: 1
DIE 0: DW_TAG_subprogram (0x7ffff68964b0)
abbrev id: 0 offset: 0 mark: 1
DW_AT_external: 1
DW_AT_name: "operator integral_constant<bool, false>::value_type"
DW_AT_decl_file: "t.ii" (0)
DW_AT_decl_line: 6
DW_AT_decl_column: 13
DW_AT_linkage_name: "_ZNK17integral_constantIbLb0EEcvbEv"
DW_AT_type: die -> 0 (0x7ffff6896460)
DW_AT_declaration: 1
but now we have a reference in the DW_TAG_subprogram DIE to the
(non-copied, original DIE for the typedef).
The early output makes the first DW_AT_signature ref refer to the
second internal one which looks weird and is what output_external_refs
barfs on. This happens via
#0 change_AT_die_ref (ref=0x7ffff69f14c8,
new_die=<dw_die_ref 0x7ffff6896a50 DW_TAG_structure_type
<parent=0x7ffff68960a0 DW_TAG_compile_unit>>)
at /space/rguenther/src/svn/trunk2/gcc/dwarf2out.c:4794
#1 0x0000000000e1e5a3 in build_abbrev_table (
die=<dw_die_ref 0x7ffff6896820 DW_TAG_structure_type <parent=0x7ffff68960a0
DW_TAG_compile_unit>>, extern_map=0x3373980)
at /space/rguenther/src/svn/trunk2/gcc/dwarf2out.c:9032
#2 0x0000000000e1e7e4 in build_abbrev_table (
die=<dw_die_ref 0x7ffff68960a0 DW_TAG_compile_unit>, extern_map=0x3373980)
at /space/rguenther/src/svn/trunk2/gcc/dwarf2out.c:9081
#3 0x0000000000e22ea9 in output_comp_unit (
die=<dw_die_ref 0x7ffff68960a0 DW_TAG_compile_unit>, output_if_empty=1,
dwo_id=0x0) at /space/rguenther/src/svn/trunk2/gcc/dwarf2out.c:10998
#4 0x0000000000e5d52b in dwarf2out_early_finish (
filename=0x7fffffffe28b "t.ii")
at /space/rguenther/src/svn/trunk2/gcc/dwarf2out.c:32167
it's an odd place to do this "optimization", it also leaves DIEs in
broken state. We can either change DW_AT_signature to DW_AT_specification
(well, not really - both DIEs are DW_AT_declaration DIEs...) or fixup
the second round of optimize_external_refs to not see "local"
DW_AT_signature as external.
Thus,
Index: dwarf2out.c
===================================================================
--- dwarf2out.c (revision 268260)
+++ dwarf2out.c (working copy)
@@ -8911,7 +8911,11 @@ optimize_external_refs_1 (dw_die_ref die
struct external_ref *ref_p;
if (is_type_die (die)
- && (c = get_AT_ref (die, DW_AT_signature)))
+ && (c = get_AT_ref (die, DW_AT_signature))
+ /* Make sure to not pick up optimized local refs from the
+ early LTO run of build_abbrev_table which performs the
+ actual redirection. */
+ && c->comdat_type_p)
{
/* This is a local skeleton; use it for local references. */
ref_p = lookup_external_ref (map, c);
ideally we'd run local ref optimization on _types_ just once...
When I compare the FAT debug info part with non-LTO debug info I see
the single type unit of the testcase output twice here (because we lack
LTO copies of .debug_types, similar to PR88878).
>From gcc-bugs-return-630897-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 12:37:13 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/89045] [9 Regression] ICE in get_parm_info, at c/c-decl.c:7518
Date: Fri, 25 Jan 2019 12:37:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Known to work| |8.2.0
Known to fail| |9.0
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Sstarted with r259641.
>From gcc-bugs-return-630899-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 12:38:51 2019
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Subject: [Bug target/89028] 8-byte loop isn't vectorized
Date: Fri, 25 Jan 2019 12:38:00 -0000
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
I am working on a patch to generate:
[hjl@gnu-hsw-1 pr89028]$ cat x.i
void
foo (char* restrict r, char* restrict a){
for (int i = 0; i < 8; i++){
r[i] += a[i];
}
}
[hjl@gnu-hsw-1 pr89028]$ make x.s
/export/build/gnu/tools-build/gcc-mmx/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-mmx/build-x86_64-linux/gcc/ -O3 -S x.i
[hjl@gnu-hsw-1 pr89028]$ cat x.s
.file "x.i"
.text
.p2align 4
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
movq (%rdi), %xmm0
movq (%rsi), %xmm1
paddb %xmm1, %xmm0
movq %xmm0, (%rdi)
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.ident "GCC: (GNU) 9.0.1 20190124 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-hsw-1 pr89028]$
>From gcc-bugs-return-630900-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 12:47:02 2019
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/89049] [8/9 Regression] Unexpected vectorization
Date: Fri, 25 Jan 2019 12:47:00 -0000
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Jan 25 12:46:24 2019
New Revision: 268264
URL: https://gcc.gnu.org/viewcvs?rev=268264&root=gcc&view=rev
Log:
2019-01-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/89049
* tree-vect-loop.c (vect_compute_single_scalar_iteration_cost):
Look at the pattern stmt to determine if the stmt is vectorized.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-vect-loop.c
>From gcc-bugs-return-630902-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 13:01:45 2019
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Subject: [Bug debug/88878] .debug_pubnames/types empty with -flto
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Applies to -fdebug-types-section as well.
>From gcc-bugs-return-630901-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 13:01:27 2019
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Subject: [Bug c/89061] New: GCC 9 introduces false positive in -Wjump-misses-init
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Bug ID: 89061
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Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: berrange at redhat dot com
Target Milestone: ---
The following demo program
$ cat demo.c
#include <stdlib.h>
struct demo {
const char *cmd;
};
int main(void)
{
struct demo demo = {0};
if ((demo.cmd = getenv("FOO")) == NULL) {
goto cleanup;
}
demo = (struct demo) { .cmd = "foo" };
cleanup:
return 0;
}
Results in new false positive warnings with GCC 9
$ gcc -Wjump-misses-init -o demo demo.c
demo.c: In function ‘main’:
demo.c:13:5: warning: jump skips variable initialization [-Wjump-misses-init]
13 | goto cleanup;
| ^~~~
demo.c:18:2: note: label ‘cleanup’ defined here
18 | cleanup:
| ^~~~~~~
demo.c:16:24: note: ‘({anonymous})’ declared here
16 | demo = (struct demo) { .cmd = "foo" };
| ^
'demo' is fully initialized at every step of the program, even taking into
account the jumps.
It appears to be triggered by the full struct assignment. If I change
demo = (struct demo) { .cmd = "foo" };
to
demo.cmd = "foo";
then it no longer triggers the false positive warning.
This is seen on Fedora 30 rawhide with gcc-9.0.1-0.1.fc30.x86_64 which appears
to be using a git master snapshot taken sometime on 2019/01/23.
>From gcc-bugs-return-630903-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 13:06:45 2019
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From: "olegendo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/89012] SH2 (FDPIC) duplicate symbols in generated assembly.
Date: Fri, 25 Jan 2019 13:06:00 -0000
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--- Comment #2 from Oleg Endo <olegendo at gcc dot gnu.org> ---
You can compile the code with the '-dp' option to see which insn patterns make
up the asm code. The pattern names will be emitted as comments in the asm
output.
>From gcc-bugs-return-630904-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 13:10:47 2019
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/89060] Improve tail call optimization
Date: Fri, 25 Jan 2019 13:10:00 -0000
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
This was previously reported as PR 87639, but this report has more analysis.
Please close one or the other as a dup.
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Subject: [Bug rtl-optimization/87763] [9 Regression] aarch64 target testcases fail after r265398
Date: Fri, 25 Jan 2019 13:29:00 -0000
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--- Comment #32 from Wilco <wilco at gcc dot gnu.org> ---
Author: wilco
Date: Fri Jan 25 13:29:06 2019
New Revision: 268265
URL: https://gcc.gnu.org/viewcvs?rev=268265&root=gcc&view=rev
Log:
[PATCH][AArch64] Fix generation of tst (PR87763)
The TST instruction no longer matches in all cases due to changes in
Combine. The fix is simple, we now need to allow a subreg as well when
selecting the cc_mode. This fixes the tst_5.c and tst_6.c failures.
AArch64 regress & bootstrap OK.
PR rtl-optimization/87763
* config/aarch64/aarch64.c (aarch64_select_cc_mode):
Allow SUBREG when matching CC_NZmode compare.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.c
>From gcc-bugs-return-630906-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 13:33:59 2019
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Subject: [Bug c++/89038] #pragma GCC diagnostic ignored "-Wunknown-pragmas" does not work
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It is a dup of PR 53431, I see no reason to keep this one open as well.
The -Wunknown-pragmas warning is emitted by the preprocessor, and for C++ the
preprocessor doesn't respect the diagnostic pragma.
*** This bug has been marked as a duplicate of bug 53431 ***
>From gcc-bugs-return-630907-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 13:34:04 2019
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Subject: [Bug c++/53431] C++ preprocessor ignores #pragma GCC diagnostic
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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CC| |ulidtko at gmail dot com
--- Comment #35 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 89038 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630908-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 14:12:13 2019
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Subject: [Bug c++/80916] [7/8/9 Regression] Spurious "declared 'static' but never defined" warning
Date: Fri, 25 Jan 2019 14:12:00 -0000
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--- Comment #9 from Jason Merrill <jason at gcc dot gnu.org> ---
It has internal linkage because one of its template arguments is a local class,
and it isn't instantiated because it isn't ever used. It's added to cgraph as
a possible devirtualization target.
I think the last of these is the place to attack this issue, since it's also
the source of the regression.
>From gcc-bugs-return-630909-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 14:18:04 2019
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Subject: [Bug target/88734] [8 Regression] AArch64's ACLE intrinsics give an ICE instead of compile error when option mismatch.
Date: Fri, 25 Jan 2019 14:18:00 -0000
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Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:
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--- Comment #11 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
(In reply to Tamar Christina from comment #10)
> Thanks Jakub! testing hasn't shown any breakages.
I would prefer this to be backported to GCC-8 if it has baked reasonably on
trunk.
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Subject: [Bug tree-optimization/89060] Improve tail call optimization
Date: Fri, 25 Jan 2019 14:41:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I suspect there is even older bug which reports this.
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Subject: [Bug tree-optimization/88760] GCC unrolling is suboptimal
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--- Comment #23 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to ktkachov from comment #22)
> helps even more. On Cortex-A72 it gives a bit more than 6% (vs 3%)
> improvement on parest, and about 5.3% on a more aggressive CPU.
> I tried unrolling 8x in a similar manner and that was not faster than 4x on
> either target.
The 4x unrolled version has 19 instructions (and microops) vs 7*4 for the
non-unrolled version, a significant reduction (without LDP it would be 21 vs
28). There is potential to use 2 more LDPs and use load+writeback which would
make it 15 vs 28 instructions, so close to 2x reduction in instructions.
>From gcc-bugs-return-630912-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 14:45:02 2019
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Subject: [Bug tree-optimization/89060] Improve tail call optimization
Date: Fri, 25 Jan 2019 14:45:00 -0000
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> I suspect there is even older bug which reports this.
PR 77938
>From gcc-bugs-return-630913-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 14:47:08 2019
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Subject: [Bug tree-optimization/89060] Improve tail call optimization
Date: Fri, 25 Jan 2019 14:47:00 -0000
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--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
And even PR 59813.
>From gcc-bugs-return-630914-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 15:06:46 2019
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Subject: [Bug tree-optimization/89049] [8/9 Regression] Unexpected vectorization
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #5)
> So combine can see
[ snip, 11 ]
> with its uses
[ snip, 13 and 25 ]
> but somehow it only tries 11 -> 13:
combine only tries to combine something with its first use. Trying second (or
third, etc.) uses as well would easily take exponential time complexity.
I do however want combine to try to combine an insn together with its first two
uses. That is just as linear as even simple 1+1 combinations, and it is likely
to succeed (in fact there is at least one other PR where I wanted this).
>From gcc-bugs-return-630915-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 15:36:55 2019
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Subject: [Bug fortran/80708] [f08] ALLOCATE with MOLD error if source-expr is a derived type with null-init pointer component
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Vladimir Fuka <vladimir.fuka at gmail dot com> changed:
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--- Comment #2 from Vladimir Fuka <vladimir.fuka at gmail dot com> ---
Here
https://stackoverflow.com/questions/54356803/can-gfortran-allocate-with-mold-or-not/54368355#54368355
the error appears for an allocatable component. Does not have to be an array. I
can also confirm the same for an initialized pointer component.
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Subject: [Bug rtl-optimization/87639] GCC fails to consider end of automatic object lifetime when determining sibcall eligibility
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
.
*** This bug has been marked as a duplicate of bug 89060 ***
>From gcc-bugs-return-630917-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 15:49:39 2019
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Subject: [Bug tree-optimization/89060] Improve tail call optimization
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
*** Bug 87639 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630919-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 15:51:47 2019
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Subject: [Bug c++/59813] tail-call elimination didn't fire for left-shift of char to cout
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
*** Bug 89060 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-630918-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 15:51:47 2019
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Subject: [Bug tree-optimization/89060] Improve tail call optimization
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
.
*** This bug has been marked as a duplicate of bug 59813 ***
>From gcc-bugs-return-630921-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 15:52:55 2019
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59813
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vanyacpp at gmail dot com
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
*** Bug 77938 has been marked as a duplicate of this bug. ***
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Subject: [Bug tree-optimization/77938] missing tailcall optimization in case when local variable escapes that goes out of scope before the possible tail call site
Date: Fri, 25 Jan 2019 15:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77938
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |jakub at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Let's track all of this in one PR.
*** This bug has been marked as a duplicate of bug 59813 ***
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Subject: [Bug c++/89036] [8/9 Regression] ICE if destructor has a requires
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89036
--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch: https://gcc.gnu.org/ml/gcc-patches/2019-01/msg01513.html
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Subject: [Bug c++/89024] [7/8/9 Regression] ICE testing convertibility of incomplete enumeration types
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89024
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords|ice-on-valid-code |ice-on-invalid-code
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Jason says this is invalid, changing the keywords.
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Subject: [Bug middle-end/89037] checking ice emitting 128-bit bit-field initializer
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--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Fri Jan 25 16:57:32 2019
New Revision: 268272
URL: https://gcc.gnu.org/viewcvs?rev=268272&root=gcc&view=rev
Log:
Fix output_constructor_bitfield handling of wide bitfields (PR89037)
The testcase was failing because we were trying to access
TREE_INT_CST_ELT (x, 1) of a 128-bit integer that was small enough
to need only a single element.
2019-01-25 Richard Sandiford <richard.sandiford@arm.com>
gcc/
PR middle-end/89037
* varasm.c (output_constructor_bitfield): Use wi::extract_uhwi
instead of accessing TREE_INT_CST_ELT directly.
gcc/testsuite/
PR middle-end/89037
* gcc.dg/pr89037.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr89037.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/varasm.c
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/89055] wrong location with predefined macros
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
The location ("loc") for the diagnostic is coming from here in
compute_array_index_type_loc:
9644 location_t loc = cp_expr_loc_or_loc (size, name ? name_loc :
input_location);
For the 2nd example:
(gdb) p /x loc
$4 = 0x80000001
(gdb) p /x line_table->location_adhoc_data_map.data[1]
$7 = {locus = 0x285e0, src_range = {m_start = 0x7fffffff, m_finish = 0x28640},
data = 0x0}
i.e. we have regular locations for the caret and finish, but a macro location
for the "start":
(gdb) call inform (line_table->location_adhoc_data_map.data[1].locus, "caret")
t.C:2:21: note: caret
2 | char b[__SIZE_MAX__ << 1];
| ^
(gdb) call inform
(line_table->location_adhoc_data_map.data[1].src_range.m_start, "start")
t.C:2:8: note: start
2 | char b[__SIZE_MAX__ << 1];
| ^~~~~~~~~~~~
(gdb) call inform
(line_table->location_adhoc_data_map.data[1].src_range.m_finish, "finish")
t.C:2:24: note: finish
2 | char b[__SIZE_MAX__ << 1];
| ^
When printing "loc", diagnostic-show-locus.c's layout::maybe_add_location_range
generates a sane layout_range:
(gdb) p ri
$15 = {m_start = {m_line = 2, m_column = 8}, m_finish = {m_line = 2, m_column =
24},
m_range_display_kind = SHOW_RANGE_WITH_CARET, m_caret = {m_line = 2, m_column
= 21}, m_original_idx = 0, m_label = 0x0}
but then sanitizes it to just the caret location here:
973 if (start.line > finish.line
974 || !compatible_locations_p (src_range.m_start, m_primary_loc)
975 || !compatible_locations_p (src_range.m_finish, m_primary_loc))
976 {
977 /* Is this the primary location? */
978 if (m_layout_ranges.length () == 0)
979 {
980 /* We want to print the caret for the primary location, but
981 we must sanitize away m_start and m_finish. */
982 ri.m_start = ri.m_caret;
983 ri.m_finish = ri.m_caret;
984 }
due to:
compatible_locations_p (src_range.m_start, m_primary_loc)
returning false.
As noted in compatible_locations_p, it may be "too strong a condition" (but I'm
loathe to weaken that sanitization in stage 4; it exists due to e.g. PR c/68473
and PR c++/70105).
If I hack out that sanitization, the 2nd is printed, sanely, as:
t.C:2:21: error: size of array ‘b’ is negative
2 | char b[__SIZE_MAX__ << 1];
| ~~~~~~~~~~~~~^~~~
(It's also not clear to me that it's a good idea to be building a compound
location containing macro locations in the first place)
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Subject: [Bug target/88469] [7/8 regression] AAPCS/AAPCS64 - Struct with 64-bit bitfield (128-bit on AArch64) may be passed in wrong registers
Date: Fri, 25 Jan 2019 17:10:00 -0000
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--- Comment #11 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Author: rearnsha
Date: Fri Jan 25 17:09:33 2019
New Revision: 268273
URL: https://gcc.gnu.org/viewcvs?rev=268273&root=gcc&view=rev
Log:
This is pretty unlikely in real code, but similar to Arm, the AArch64
ABI has a bug with the handling of 128-bit bit-fields, where if the
bit-field dominates the overall alignment the back-end code may end up
passing the argument correctly. This is a regression that started in
gcc-6 when the ABI support code was updated to support overaligned
types. The fix is very similar in concept to the Arm fix. 128-bit
bit-fields are fortunately extremely rare, so I'd be very surprised if
anyone has been bitten by this.
PR target/88469
gcc/
* config/aarch64/aarch64.c (aarch64_function_arg_alignment): Add new
argument ABI_BREAK. Set to true if the calculated alignment has
changed in gcc-9. Check bit-fields for their base type alignment.
(aarch64_layout_arg): Warn if argument passing has changed in gcc-9.
(aarch64_function_arg_boundary): Likewise.
(aarch64_gimplify_va_arg_expr): Likewise.
gcc/testsuite/
* gcc.target/aarch64/aapcs64/test_align-10.c: New test.
* gcc.target/aarch64/aapcs64/test_align-11.c: New test.
* gcc.target/aarch64/aapcs64/test_align-12.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/aarch64/aapcs64/test_align-10.c
trunk/gcc/testsuite/gcc.target/aarch64/aapcs64/test_align-11.c
trunk/gcc/testsuite/gcc.target/aarch64/aapcs64/test_align-12.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.c
trunk/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/88560] [9 Regression] armv8_2-fp16-move-1.c and related regressions after r266385
Date: Fri, 25 Jan 2019 17:21:00 -0000
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--- Comment #11 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Hi Vladimir,
I've tested the patch and checked the testcases.
The code is now better in most cases so no issue there. The testcases will need
to be updated but I can do that after the patch is committed.
I've kicked off an overnight native regression test and will inspect the result
and any failing tests and update you first thing monday.
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Subject: [Bug c++/89024] [7/8/9 Regression] ICE testing convertibility of incomplete enumeration types
Date: Fri, 25 Jan 2019 17:25:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|ice-on-invalid-code |ice-on-valid-code
--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Nope, changing it back.
>From gcc-bugs-return-630929-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 17:56:02 2019
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Subject: [Bug fortran/85780] ICE in resolve_fl_procedure, at fortran/resolve.c:12504
Date: Fri, 25 Jan 2019 17:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85780
--- Comment #10 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Fri Jan 25 17:55:25 2019
New Revision: 268277
URL: https://gcc.gnu.org/viewcvs?rev=268277&root=gcc&view=rev
Log:
2019-01-25 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/85780
* decl.c (gfc_match_subroutine): Check for conflict between BIND(C)
and alternative return.
2019-01-25 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/85780
* gfortran.dg/pr85780.f90: Update testcase for error message.
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/decl.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/pr85780.f90
>From gcc-bugs-return-630930-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 17:56:54 2019
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Subject: [Bug fortran/85780] ICE in resolve_fl_procedure, at fortran/resolve.c:12504
Date: Fri, 25 Jan 2019 17:56:00 -0000
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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--- Comment #11 from kargl at gcc dot gnu.org ---
Fixed on trunk. Closing.
>From gcc-bugs-return-630931-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 17:57:40 2019
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/89061] GCC 9 introduces false positive in -Wjump-misses-init
Date: Fri, 25 Jan 2019 17:57:00 -0000
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--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Guessing this might be another issue from pushdecl being called for
compound literals (r259641).
(Technically of course it's true that the jump misses the initialization
of the anonymous object for the compound literal, that's just a useless
warning.)
>From gcc-bugs-return-630932-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 18:12:05 2019
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Subject: [Bug ipa/88933] ICE: verify_cgraph_node failed (Error: caller edge count does not match BB count)
Date: Fri, 25 Jan 2019 18:12:00 -0000
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--- Comment #17 from Martin Jambor <jamborm at gcc dot gnu.org> ---
OK, I did that too and proposed a patch in
https://gcc.gnu.org/ml/gcc-patches/2019-01/msg01525.html
>From gcc-bugs-return-630933-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 18:26:01 2019
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From: "barry.revzin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/89062] New: class template argument deduction failure with parentheses
Date: Fri, 25 Jan 2019 18:26:00 -0000
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Bug ID: 89062
Summary: class template argument deduction failure with
parentheses
Product: gcc
Version: 9.0
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Reduced from StackOverflow https://stackoverflow.com/q/54369677/2069064:
template<class T>
struct Foo {
Foo(T) {}
};
template<class T>
struct Bar {
Bar(T) {};
};
Foo foo(Bar{1});
This fails with:
<source>:11:9: error: 'auto' parameter not permitted in this context
Foo foo(Bar{1});
^~~
Compiler returned: 1
Every other alternative is fine:
Foo foo(Bar(1)); // ok
Foo foo{Bar{1}}; // ok
Foo foo{Bar(1)}; // ok
Foo foo(Bar<int>(1)); // ok
Foo foo(Bar<int>{1}); // ok
Foo<Bar<int>> foo(Bar{1}); // ok
>From gcc-bugs-return-630934-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 18:31:01 2019
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Subject: [Bug c++/89062] class template argument deduction failure with parentheses
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-25
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-630935-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 18:32:41 2019
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Subject: [Bug c++/89062] class template argument deduction failure with parentheses
Date: Fri, 25 Jan 2019 18:32:00 -0000
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--- Comment #2 from Barry Revzin <barry.revzin at gmail dot com> ---
This may or may not be the same bug as
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87709, I do not know.
>From gcc-bugs-return-630936-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 18:40:18 2019
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Subject: [Bug libfortran/89020] close(status='DELETE') does not remove file
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Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:
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CC| |jvdelisle at gcc dot gnu.org
--- Comment #6 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to Steve Kargl from comment #5)
--- snip ---
>
> Of course, I could be missing something obvious. Jerry?
Hi Steve, I have time today to have a look at this. Does seem a bit unusual on
the surface.
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Subject: [Bug fortran/87937] [8 Regression] LHS reallocation broken inside "select type" and "associate"
Date: Fri, 25 Jan 2019 18:49:00 -0000
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #16 from Paul Thomas <pault at gcc dot gnu.org> ---
The regression is fixed on 8- and 9-branches.
Paul
>From gcc-bugs-return-630938-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 18:52:45 2019
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Subject: [Bug fortran/87336] [8/9 regression] wrong output for pointer dummy assiocated to target actual argument
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--- Comment #7 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Harald Anlauf from comment #6)
> The patch in comment #3 seems to apply to gcc-8, but I haven't regtested it.
> Paul, do you intend to backport it?
It is regtesting on 8-branch as I write.
Paul
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Subject: [Bug fortran/87151] allocating array of character
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Paul Thomas <pault at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Paul Thomas <pault at gcc dot gnu.org> ---
I cleared up a load of ASSOCIATE related bugs on trunk. Attempts to apply a
composite patch don't apply cleanly and so I am marking this as fixed.
Paul
>From gcc-bugs-return-630941-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 18:54:47 2019
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Subject: [Bug fortran/80708] [f08] ALLOCATE with MOLD error if source-expr is a derived type with null-init pointer component
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CC| |kargl at gcc dot gnu.org
--- Comment #3 from kargl at gcc dot gnu.org ---
The problematic code is in resolve.c at lines 8028-8040.
This code was added in r241885 by vehre. I don't see
how this code can possible work for an allocation of
an array of derived types as all information about the
array shape of mold has been striped.
if (code->expr3 && code->expr3->mold
&& code->expr3->ts.type == BT_DERIVED)
{
/* Default initialization via MOLD (non-polymorphic). */
gfc_expr *rhs = gfc_default_initializer (&code->expr3->ts);
if (rhs != NULL)
{
gfc_resolve_expr (rhs);
gfc_free_expr (code->expr3);
code->expr3 = rhs;
}
}
Prior to the if statement one has
(gdb) p *code->expr3
$3 = {expr_type = EXPR_VARIABLE, ts = {type = BT_DERIVED, kind = 0, u = {
derived = 0x20306f600, cl = 0x20306f600, pad = 50787840}, interface =
0x0,
is_c_interop = 0, is_iso_c = 0, f90_type = BT_UNKNOWN, deferred = false,
interop_kind = 0x0}, rank = 1, shape = 0x2031689f0, symtree = 0x2023a45d0,
ref = 0x203149300, where = {nextc = 0x20308a9cc, lb = 0x20308a960}, base_expr
= 0x0,
is_boz = 0, is_snan = 0, error = 0, user_operator = 0, mold = 1,
must_finalize = 0,
no_bounds_check = 0, external_blas = 0, do_not_resolve_again = 0,
representation = {
length = 0, string = 0x0}, value = {logical = 0, iokind = M_READ, integer =
{{
_mp_alloc = 0, _mp_size = 0, _mp_d = 0x0}}, real = {{_mpfr_prec = 0,
_mpfr_sign = 0, _mpfr_exp = 0, _mpfr_d = 0x0}}, complex = {{re = {{
_mpfr_prec = 0, _mpfr_sign = 0, _mpfr_exp = 0, _mpfr_d = 0x0}}, im
= {{
_mpfr_prec = 0, _mpfr_sign = 0, _mpfr_exp = 0, _mpfr_d = 0x0}}}},
op = {
op = GFC_INTRINSIC_BEGIN, uop = 0x0, op1 = 0x0, op2 = 0x0}, function = {
actual = 0x0, name = 0x0, isym = 0x0, esym = 0x0}, compcall = {actual =
0x0,
name = 0x0, base_object = 0x0, tbp = 0x0, ignore_pass = 0, assign = 0},
character = {length = 0, string = 0x0}, constructor = 0x0}, param_list =
0x0}
after the if () completes, one has
$4 = {expr_type = EXPR_STRUCTURE, ts = {type = BT_DERIVED, kind = 0, u = {
derived = 0x20306f600, cl = 0x20306f600, pad = 50787840}, interface =
0x0,
is_c_interop = 0, is_iso_c = 0, f90_type = BT_UNKNOWN, deferred = false,
interop_kind = 0x0}, rank = 0, shape = 0x0, symtree = 0x0, ref = 0x0, where
= {
nextc = 0x20306a1d0, lb = 0x20306a190}, base_expr = 0x0, is_boz = 0,
is_snan = 0,
error = 0, user_operator = 0, mold = 0, must_finalize = 0, no_bounds_check =
0,
external_blas = 0, do_not_resolve_again = 0, representation = {length = 0,
string = 0x0}, value = {logical = 51159296, iokind = 51159296, integer = {{
_mp_alloc = 51159296, _mp_size = 2, _mp_d = 0x0}}, real = {{
_mpfr_prec = 8641093888, _mpfr_sign = 0, _mpfr_exp = 0, _mpfr_d =
0x0}},
complex = {{re = {{_mpfr_prec = 8641093888, _mpfr_sign = 0, _mpfr_exp = 0,
_mpfr_d = 0x0}}, im = {{_mpfr_prec = 0, _mpfr_sign = 0, _mpfr_exp =
0,
_mpfr_d = 0x0}}}}, op = {op = 51159296, uop = 0x0, op1 = 0x0, op2 =
0x0},
function = {actual = 0x2030ca100, name = 0x0, isym = 0x0, esym = 0x0},
compcall = {
actual = 0x2030ca100, name = 0x0, base_object = 0x0, tbp = 0x0,
ignore_pass = 0,
assign = 0}, character = {length = 8641093888, string = 0x0},
constructor = 0x2030ca100}, param_list = 0x0}
Code compiles if I delete the suspicious code.
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Subject: [Bug fortran/68241] [meta-bug] [F03] Deferred-length character
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Bug 68241 depends on bug 87151, which changed state.
Bug 87151 Summary: allocating array of character
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87151
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Subject: [Bug fortran/68241] [meta-bug] [F03] Deferred-length character
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Bug 68241 depends on bug 85603, which changed state.
Bug 85603 Summary: ICE with character array substring assignment
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85603
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/89020] close(status='DELETE') does not remove file
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--- Comment #7 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Fri, Jan 25, 2019 at 06:40:14PM +0000, jvdelisle at gcc dot gnu.org wrote:
>
> --- Comment #6 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
> (In reply to Steve Kargl from comment #5)
> --- snip ---
> >
> > Of course, I could be missing something obvious. Jerry?
>
> Hi Steve, I have time today to have a look at this. Does seem a bit unusual on
> the surface.
>
Thanks. I was expecting to see something like
result = remove(...) /* returns 0, -1, and set errno. */
if (iostat is present) iostat = result; /* could also set to errno. */
if (iomsg is present) iomsg = strerror (errno); /* Look up errno error
message. */
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Paul Thomas <pault at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Paul Thomas <pault at gcc dot gnu.org> ---
Fixed on trunk. Thanks for the report.
Paul
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Subject: [Bug lto/66835] C++ openMP test failed after switching to C++14
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--- Comment #5 from Stupachenko Evgeny <evstupac at gmail dot com> ---
Yes, It is fixed starting from 5.3.
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Subject: [Bug middle-end/67946] Function multiversioning ICE
Date: Fri, 25 Jan 2019 19:38:00 -0000
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--- Comment #4 from Stupachenko Evgeny <evstupac at gmail dot com> ---
fixed starting from gcc 6
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Subject: [Bug c++/89062] class template argument deduction failure with parentheses
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ensadc at mailnesia dot com changed:
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--- Comment #3 from ensadc at mailnesia dot com ---
I think this should be treated as a different bug from bug 87709. In bug 87709,
the error is emitted in cp_parser_type_id_1. In this bug, the error is produced
by grokdeclarator.
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Subject: [Bug fortran/80708] [f08] ALLOCATE with MOLD error if source-expr is a derived type with null-init pointer component
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--- Comment #4 from kargl at gcc dot gnu.org ---
(In reply to kargl from comment #3)
>
> Code compiles if I delete the suspicious code.
>
Unfortunately, there is a regression in the testsuite,
and even more unfortunate, the regression comes in code
that involves CLASS, which I have zero experience with.
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Subject: [Bug c++/88969] [9 Regression] ICE in build_op_delete_call, at cp/call.c:6509
Date: Fri, 25 Jan 2019 19:51:00 -0000
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--- Comment #6 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Fri Jan 25 19:50:55 2019
New Revision: 268278
URL: https://gcc.gnu.org/viewcvs?rev=268278&root=gcc&view=rev
Log:
/cp
2019-01-25 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/88969
* call.c (build_op_delete_call): Implement 7.6.2.5/(10.1).
* decl2.c (coerce_delete_type): Use build_pointer_type instead
of TYPE_POINTER_TO.
/testsuite
2019-01-25 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/88969
* g++.dg/cpp2a/destroying-delete2.C: New.
* g++.dg/cpp2a/destroying-delete3.C: Likewise.
Added:
trunk/gcc/testsuite/g++.dg/cpp2a/destroying-delete2.C
trunk/gcc/testsuite/g++.dg/cpp2a/destroying-delete3.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/decl2.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/88969] [9 Regression] ICE in build_op_delete_call, at cp/call.c:6509
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Foxed.
>From gcc-bugs-return-630951-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 19:54:27 2019
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From: "wojciech_mula at poczta dot onet.pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/89063] New: [x86] lack of support for BEXTR from BMI extension
Date: Fri, 25 Jan 2019 19:54:00 -0000
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Bug ID: 89063
Summary: [x86] lack of support for BEXTR from BMI extension
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: wojciech_mula at poczta dot onet.pl
Target Milestone: ---
Instruction BEXTR extracts an arbitrary unsigned bit field from 32- or 64-bit
value. As I see in `config/i386.md`, there's support for the immediate
variant available in AMD's TBM (TARGET_TBM).
Intel's variant gets parameters from a register. Although this variant
won't be profitable in all cases -- as we need an extra move to setup
the bit-field parameters in a register -- I bet bit-field-intensive
code might benefit from BEXTR.
---bextr.c---
#include <immintrin.h>
#include <stdint.h>
uint64_t test(uint64_t x) {
const uint64_t a0 = (x & 0x3f);
const uint64_t a1 = (x >> 11) & 0x3f;
const uint64_t a2 = (x >> 22) & 0x3f;
return a0 + a1 + a2;
}
uint64_t test_intrinsics(uint64_t x) {
const uint64_t a0 = (x & 0x3f);
const uint64_t a1 = _bextr_u64(x, 11, 6);
const uint64_t a2 = _bextr_u64(x, 22, 6);
return a0 + a1 + a2;
}
---eof---
$ gcc --version
gcc (GCC) 9.0.0 20190117 (experimental)
$ gcc -O3 -mbmi -march=skylake bextr.c -c && objdump -d bextr.o
0000000000000000 <test>:
0: 48 89 fa mov %rdi,%rdx
3: 48 c1 ea 0b shr $0xb,%rdx
7: 48 89 f8 mov %rdi,%rax
a: 48 89 d1 mov %rdx,%rcx
d: 48 c1 e8 16 shr $0x16,%rax
11: 83 e0 3f and $0x3f,%eax
14: 83 e1 3f and $0x3f,%ecx
17: 48 8d 14 01 lea (%rcx,%rax,1),%rdx
1b: 83 e7 3f and $0x3f,%edi
1e: 48 8d 04 3a lea (%rdx,%rdi,1),%rax
22: c3 retq
0000000000000030 <test_intrinsics>:
30: b8 0b 06 00 00 mov $0x60b,%eax
35: c4 e2 f8 f7 d7 bextr %rax,%rdi,%rdx
3a: b8 16 06 00 00 mov $0x616,%eax
3f: c4 e2 f8 f7 c7 bextr %rax,%rdi,%rax
44: 83 e7 3f and $0x3f,%edi
47: 48 01 d0 add %rdx,%rax
4a: 48 01 f8 add %rdi,%rax
4d: c3 retq
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Subject: [Bug fortran/88961] valgrind error in resolve_ref
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David Binderman <dcb314 at hotmail dot com> changed:
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--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
This bug seems fixed by the time we get to revision 268250.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87336
--- Comment #8 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Fri Jan 25 20:08:58 2019
New Revision: 268279
URL: https://gcc.gnu.org/viewcvs?rev=268279&root=gcc&view=rev
Log:
2019-01-25 Paul Thomas <pault@gcc.gnu.org>
PR fortran/87336
* trans-array.c (gfc_get_array_span): Try to get the element
length of incomplete types. Return NULL_TREE otherwise.
(gfc_conv_expr_descriptor): Only set the 'span' field if the
above does not return NULL_TREE. Set 'span' field if possible
for all new descriptors.
2019-01-25 Paul Thomas <pault@gcc.gnu.org>
PR fortran/87336
* gfortran.dg/pointer_array_10.f90 : New test.
* gfortran.dg/assign_10.f90 : Increase 'parm' count to 20.
* gfortran.dg/transpose_optimization_2.f90 : Increase 'parm'
count to 72.
Added:
branches/gcc-8-branch/gcc/testsuite/gfortran.dg/pointer_array_10.f90
Modified:
branches/gcc-8-branch/gcc/fortran/ChangeLog
branches/gcc-8-branch/gcc/fortran/trans-array.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/testsuite/gfortran.dg/assign_10.f90
branches/gcc-8-branch/gcc/testsuite/gfortran.dg/transpose_optimization_2.f90
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Subject: [Bug fortran/87336] [8/9 regression] wrong output for pointer dummy assiocated to target actual argument
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from Paul Thomas <pault at gcc dot gnu.org> ---
Fixed on 8- and 9-branches.
Thanks for the report.
Paul
>From gcc-bugs-return-630955-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 20:18:06 2019
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Subject: [Bug testsuite/89064] New: [9 regression] libgomp.graphite/force-parallel-5.c fails starting with r268257
Date: Fri, 25 Jan 2019 20:18:00 -0000
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Bug ID: 89064
Summary: [9 regression] libgomp.graphite/force-parallel-5.c
fails starting with r268257
Product: gcc
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Does this test case need updating?
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/libgomp/testsuite/libgomp.graphite/force-parallel-5.c
-B/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/
-B/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/.libs
-I/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp
-I/home/seurer/gcc/gcc-test2/libgomp/testsuite/../../include
-I/home/seurer/gcc/gcc-test2/libgomp/testsuite/.. -fmessage-length=0
-fno-diagnostics-show-caret -Wno-hsa -fdiagnostics-color=never -fopenmp -ansi
-pedantic-errors -O2 -ftree-parallelize-loops=4 -floop-parallelize-all
-fdump-tree-parloops-details -fdump-tree-optimized -fno-loop-strip-mine
-fno-loop-block -fdump-tree-graphite-all
-L/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/.libs
-lm -o ./force-parallel-5.exe
Executing on host: /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/ offload_gcn37385.c
-B/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/
-B/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/.libs
-I/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp
-I/home/seurer/gcc/gcc-test2/libgomp/testsuite/../../include
-I/home/seurer/gcc/gcc-test2/libgomp/testsuite/.. -fmessage-length=0
-fno-diagnostics-show-caret -Wno-hsa -fdiagnostics-color=never -fopenmp
-foffload=amdgcn-unknown-amdhsa -S -o offload_gcn37385.s (timeout = 300)
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/ offload_gcn37385.c
-B/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/
-B/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/.libs
-I/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp
-I/home/seurer/gcc/gcc-test2/libgomp/testsuite/../../include
-I/home/seurer/gcc/gcc-test2/libgomp/testsuite/.. -fmessage-length=0
-fno-diagnostics-show-caret -Wno-hsa -fdiagnostics-color=never -fopenmp
-foffload=amdgcn-unknown-amdhsa -S -o offload_gcn37385.s
xgcc: fatal error: GCC is not configured to support amdgcn-unknown-amdhsa as
offload target
compilation terminated.
compiler exited with status 1
PASS: libgomp.graphite/force-parallel-5.c (test for excess errors)
Setting LD_LIBRARY_PATH to
.:/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/.libs:/home/seurer/gcc/build/gcc-test2/gcc:.:/home/seurer/gcc/build/gcc-test2/powerpc64le-unknown-linux-gnu/./libgomp/.libs:/home/seurer/gcc/build/gcc-test2/gcc:/home/seurer/gcc/build/gcc-test2/./gmp/.libs:/home/seurer/gcc/build/gcc-test2/./prev-gmp/.libs:/home/seurer/gcc/build/gcc-test2/./mpfr/src/.libs:/home/seurer/gcc/build/gcc-test2/./prev-mpfr/src/.libs:/home/seurer/gcc/build/gcc-test2/./mpc/src/.libs:/home/seurer/gcc/build/gcc-test2/./prev-mpc/src/.libs:/home/seurer/gcc/build/gcc-test2/./isl/.libs:/home/seurer/gcc/build/gcc-test2/./prev-isl/.libs
Execution timeout is: 300
spawn [open ...]
PASS: libgomp.graphite/force-parallel-5.c execution test
libgomp.graphite/force-parallel-5.c: pattern found 0 times
FAIL: libgomp.graphite/force-parallel-5.c scan-tree-dump-times graphite "2
loops carried no dependency" 1
PASS: libgomp.graphite/force-parallel-5.c scan-tree-dump-times optimized
"loopfn.0" 4
PASS: libgomp.graphite/force-parallel-5.c scan-tree-dump-times optimized
"loopfn.1" 4
testcase
/home/seurer/gcc/gcc-test2/libgomp/testsuite/libgomp.graphite/graphite.exp
completed in 1 seconds
=== libgomp Summary ===
# of expected passes 4
# of unexpected failures 1
r268257 | rguenth | 2019-01-25 02:13:34 -0600 (Fri, 25 Jan 2019) | 10 lines
2019-01-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/86865
* graphite-scop-detection.c (scop_detection::can_represent_loop):
Reject non-do-while loops.
* gcc.dg/graphite/pr86865.c: New testcase.
* gcc.dg/graphite/pr69728.c: XFAIL.
* gcc.dg/graphite/scop-21.c: Likewise.
>From gcc-bugs-return-630956-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 20:52:36 2019
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Subject: [Bug libstdc++/89044] libstdc++-6.dll is installed in the wrong directory cross-compiling with a multilib configuration
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
OK thanks, I'll try to take a look into it.
>From gcc-bugs-return-630957-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 21:14:54 2019
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Subject: [Bug fortran/34871] Flavor VARIABLE vs. FUNCTION: Accepts invalid
Date: Fri, 25 Jan 2019 21:14:00 -0000
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Harald Anlauf <anlauf at gmx dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |anlauf at gmx dot de
--- Comment #5 from Harald Anlauf <anlauf at gmx dot de> ---
If the example in comment #0 is changed as follows:
MODULE TESTS
dimension :: k(4)
CONTAINS
function k() result (kk)
kk = 35
end function k
END MODULE TESTS
the code - although still invalid - still compiles, but the dump-tree
is completely different.
I also see big differences in the dump-tree between comment #0 and the
above for 9-trunk, but not for 8-branch.
ISTR a patch (Steve) that fixed a related issue with RESULT(), maybe
that is the place to look for a fix?
>From gcc-bugs-return-630958-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 21:26:36 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/89065] New: set::find always returns const iterator
Date: Fri, 25 Jan 2019 21:26:00 -0000
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Bug ID: 89065
Summary: set::find always returns const iterator
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by the standard there are 2 overloads of find:
iterator find( const Key& key );
const_iterator find( const Key& key ) const;
However, libstdc++ seem to return const iterator even on non const object.
Consider the example:
#include <iostream>
#include <set>
struct FatKey { int x; int ref_count; };
bool operator<(const FatKey& fk1, const FatKey& fk2) { return fk1.x < fk2.x; }
int main()
{
std::set<FatKey> example = { {1, 0 }, {2, 0 }, {3, 0 }, {4, 0 } };
auto search = example.find({1, 0});
if (search != example.end()) {
search->ref_count++;
std::cout << "Found " << search->x << '\n';
} else {
std::cout << "Not found\n";
}
}
It fails to compile with the error:
main.cpp: In function 'int main()':
main.cpp:11:26: error: increment of member 'FatKey::ref_count' in read-only
object
search->ref_count++;
While it shouldn't.
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Subject: [Bug fortran/88810] gcc/fortran/dependency.c:2200: possible cut'n'paste error ?
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88810
--- Comment #8 from kargl at gcc dot gnu.org ---
Created attachment 45533
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45533&action=edit
patch
The attached patch re-arranges the code to hopefully clarify the logic.
2019-01-26 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/88810
* dependency.c (gfc_dep_resolver): Re-arrange code to make the logic
a bit more transparent. Fix 2 nearby formatting issues.
Note, as the code is correct in its current form, I will hold
this patch until stage 1 opens for gcc 10.
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Subject: [Bug libstdc++/89065] set::find always returns const iterator
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
iterator and const_iterator are the same type for std::set, the elements are
always immutable...
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Subject: [Bug libstdc++/89065] set::find always returns const iterator
Date: Fri, 25 Jan 2019 22:02:00 -0000
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--- Comment #2 from baltic <1000hz.radiowave at gmail dot com> ---
Ok, i see 26.2.6.6 section of the standard:
iterator of an associative container is of the bidirectional iterator category.
For associative containers where the value type is the same as the key type,
both iterator and const_iterator are constant iterators.
Weird though.
I think this could be closed as invalid.
Thanks!
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Subject: [Bug libstdc++/89065] set::find always returns const iterator
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Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
.
>From gcc-bugs-return-630963-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 22:29:39 2019
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Subject: [Bug rtl-optimization/88846] [9 Regression] pr69776-2.c failure on 32 bit AIX
Date: Fri, 25 Jan 2019 22:29:00 -0000
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--- Comment #6 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
Sorry, I wrote wrong PR number in the ChangeLog entry (I already fix the
number). Here is the info about the patch I've committed
Author: vmakarov
Date: Fri Jan 25 22:13:43 2019
New Revision: 268280
URL: https://gcc.gnu.org/viewcvs?rev=268280&root=gcc&view=rev
Log:
2019-01-25 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/888846
* ira.c (process_set_for_memref_referenced_p): New.
(memref_referenced_p): Add new param. Use
process_set_for_memref_referenced_p. Add new switch cases.
(memref_used_between_p): Pass new arg to memref_referenced_p.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ira.c
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Subject: [Bug c/89066] New: After creating valid paths, the \ in source directory are / which creates "No such file or directory"
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Bug ID: 89066
Summary: After creating valid paths, the \ in source directory
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In my direcory:
N:\nesys\asm6\src
after typing:
gcc -v -save-temps good.c -o good > ok.txt 2>&1
ok.txt reads:
Using built-in specs.
COLLECT_GCC=gcc
Target: i686-w64-mingw32
Configured with: ../../../src/gcc-8.1.0/configure --host=i686-w64-mingw32
--build=i686-w64-mingw32 --target=i686-w64-mingw32 --prefix=/mingw32
--with-sysroot=/c/mingw810/i686-810-win32-sjlj-rt_v6-rev0/mingw32
--enable-shared --enable-static --enable-targets=all --enable-multilib
--enable-languages=c,c++,fortran,lto --enable-libstdcxx-time=yes
--enable-threads=win32 --enable-libgomp --enable-libatomic --enable-lto
--enable-graphite --enable-checking=release --enable-fully-dynamic-string
--enable-version-specific-runtime-libs --enable-sjlj-exceptions
--disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap
--disable-rpath --disable-win32-registry --disable-nls --disable-werror
--disable-symvers --with-gnu-as --with-gnu-ld --with-arch-32=i686
--with-arch-64=nocona --with-tune-32=generic --with-tune-64=core2
--with-libiconv --with-system-zlib
--with-gmp=/c/mingw810/prerequisites/i686-w64-mingw32-static
--with-mpfr=/c/mingw810/prerequisites/i686-w64-mingw32-static
--with-mpc=/c/mingw810/prerequisites/i686-w64-mingw32-static
--with-isl=/c/mingw810/prerequisites/i686-w64-mingw32-static
--with-pkgversion='i686-win32-sjlj-rev0, Built by MinGW-W64 project'
--with-bugurl=https://sourceforge.net/projects/mingw-w64 CFLAGS='-O2 -pipe
-fno-ident -I/c/mingw810/i686-810-win32-sjlj-rt_v6-rev0/mingw32/opt/include
-I/c/mingw810/prerequisites/i686-zlib-static/include
-I/c/mingw810/prerequisites/i686-w64-mingw32-static/include' CXXFLAGS='-O2
-pipe -fno-ident
-I/c/mingw810/i686-810-win32-sjlj-rt_v6-rev0/mingw32/opt/include
-I/c/mingw810/prerequisites/i686-zlib-static/include
-I/c/mingw810/prerequisites/i686-w64-mingw32-static/include' CPPFLAGS='
-I/c/mingw810/i686-810-win32-sjlj-rt_v6-rev0/mingw32/opt/include
-I/c/mingw810/prerequisites/i686-zlib-static/include
-I/c/mingw810/prerequisites/i686-w64-mingw32-static/include' LDFLAGS='-pipe
-fno-ident -L/c/mingw810/i686-810-win32-sjlj-rt_v6-rev0/mingw32/opt/lib
-L/c/mingw810/prerequisites/i686-zlib-static/lib
-L/c/mingw810/prerequisites/i686-w64-mingw32-static/lib
-Wl,--large-address-aware'
Thread model: win32
gcc version 8.1.0 (i686-win32-sjlj-rev0, Built by MinGW-W64 project)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-o' 'good.exe' '-mtune=generic'
'-march=i686'
cc1 -E -quiet -v -iprefix N:/nesys/asm6/src/../lib/gcc/i686-w64-mingw32/8.1.0/
-U_REENTRANT good.c -mtune=generic -march=i686 -fpch-preprocess -o good.i
gcc: error: CreateProcess: No such file or directory
*eof
And so I think this happens because the second to last line beginning with
"cc1" has the directory after -iprefix "N:/nesys/asm6/src/.." and in cmd the
directories have to use \. I noticed this after looking though someone else's
post in a forum citing output from a "gcc -v" line. Their text had "-iprefix
c:\mingw.4.7.2\bin\../lib/gcc/i686-pc-mingw32/4.7.2/" and my slashes from my -v
response, in the source directory, are backwards... so I think it's a bug.
Sorry, if this isn't a bug.
Matthew
p.s. The -save-temps didn't return a *.i* file; I think that's because good.c
is 0kb or empty. I received the exact same -v response when using my source
file and didn't think this "bug" has anything to do with the gcc compiler
compiling... so I substituted my empty good.c. Hope that's ok. :)
>From gcc-bugs-return-630965-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 22:51:37 2019
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Subject: [Bug c++/89056] Optimizer generates bad code for non-void function that fails to return a value
Date: Fri, 25 Jan 2019 22:51:00 -0000
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--- Comment #6 from Darryl Okahata <darryl_okahata at keysight dot com> ---
(OK, at this point, I'm just whinging, so please feel free to ignore this.)
I just wish the C++ standard instead just allowed an undefined value to be
returned, instead of generating bad optimized code. With the current state, I
either have to add compiler-specific extensions or unreachable return
statements to insure that correct code is generated (unexpected and violates
POLA). The issue is that g++ (understandably) can't always detect if there is
always a proper return statement (execution can never hit the end of the
function). Grossly-oversimplified example (real code is much more
complicated):
enum E { A, B };
bool bah(const enum E a)
{
if (a == A)
return false;
if (a == B)
return true;
}
Compiling with (8.2.0):
g++ -S -O badbad.cc
gives:
badbad.cc: In function 'bool bah(E)':
badbad.cc:10:1: warning: control reaches end of non-void function
[-Wreturn-type]
}
^
Understandable, as I don't expect g++ to figure out complicated code
machinations. However, I don't know all the circumstances under which this
warning means that g++ is generating bad code. As a result, I have to add
unreachable return statements to insure that g++ does not generate bad
optimized code. Our code runs on multiple platforms, and so I'd rather avoid
the use of g++ extensions (e.g., __builtin_unreachable() or attributes) and
cluttering #ifdefs. Adding an unreachable return is undesirable but simple and
portable:
enum E { A, B };
bool bah(const enum E a)
{
if (a == A)
return false;
if (a == B)
return true;
return false; // UNREACHABLE
}
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Subject: [Bug driver/89066] After creating valid paths, the \ in source directory are / which creates "No such file or directory"
Date: Fri, 25 Jan 2019 22:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89066
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|*-mingw* *-cygwin* |i686-w64-mingw32
Component|c |driver
Host| |i686-w64-mingw32
Build| |i686-w64-mingw32
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> cc1 -E -quiet -v -iprefix N:/nesys/asm6/src/../lib/gcc/i686-w64-mingw32/8.1.0/ -U_REENTRANT good.c -mtune=generic -march=i686 -fpch-preprocess -o good.i
>gcc: error: CreateProcess: No such file or directory
This is the problem the GCC driver can't find cc1.
The replacement of \ to / is valid transformation for Windows.
>From gcc-bugs-return-630967-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 23:02:02 2019
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Subject: [Bug driver/89066] After creating valid paths, the \ in source directory are / which creates "No such file or directory"
Date: Fri, 25 Jan 2019 23:02:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>Built by MinGW-W64 project
Can you make sure you downloaded all of the correct binaries.
>From gcc-bugs-return-630968-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 23:08:10 2019
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Subject: [Bug driver/89066] After creating valid paths, the \ in source directory are / which creates "No such file or directory"
Date: Fri, 25 Jan 2019 23:08:00 -0000
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--- Comment #3 from Matthew Wuensche <icypawn at aol dot com> ---
I ran the online installer... and received this file mingw-w64-install.exe.
And I reran the file to make sure all of those files were added. I found cc1
and added that path before submitting my "bug" report.
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;"C:\Program
Files (x86)\ATI Technologies\ATI.ACE\Core-Static";"C:\Program Files
(x86)\Common
Files\lenovo\easyplussdk\bin";C:\WINDOWS\System32\OpenSSH\;C:\Users\auser\AppData\Local\Microsoft\WindowsApps;"C:\Program
Files (x86)\mingw-w64\i686-8.1.0-win32-sjlj-rt_v6-rev0\mingw32\bin";"C:\Program
Files
(x86)\mingw-w64\i686-8.1.0-win32-sjlj-rt_v6-rev0\mingw32\libexec\gcc\i686-w64-mingw32\8.1.0"
see the last path? That's where cc1.exe is. :)
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Subject: [Bug fortran/89067] New: Inaccurate error message: 'i' at (1) is not a member of the 'x' structure
Date: Fri, 25 Jan 2019 23:19:00 -0000
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Bug ID: 89067
Summary: Inaccurate error message: 'i' at (1) is not a member
of the 'x' structure
Product: gcc
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From: "eric.niebler at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/89068] New: Nested inline anonymous namespaces are erroneously reported as conflicting
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Bug ID: 89068
Summary: Nested inline anonymous namespaces are erroneously
reported as conflicting
Product: gcc
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The following valid code is rejected by g++ -std=c++XY for any XY >= 11:
inline namespace {
inline namespace {}
}
inline namespace {}
The error message I get is:
<source>:4:8: error: 'namespace { }' conflicts with a previous declaration
inline namespace {}
^~~~~~~~~
<source>:1:8: note: previous declaration 'namespace { }'
inline namespace {
^~~~~~~~~
Compiler returned: 1
>From gcc-bugs-return-630971-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 23:23:08 2019
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Subject: [Bug fortran/89067] Inaccurate error message: 'i' at (1) is not a member of the 'x' structure
Date: Fri, 25 Jan 2019 23:23:00 -0000
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--- Comment #1 from Antony Lewis <antony at cosmologist dot info> ---
The error message on this code
subroutine test
type x
end type
type, extends(x):: y
integer ii
end type
type(y) yy
yy%i=1
end subroutine
is
Error: 'i' at (1) is not a member of the 'x' structure
But it should refer to the 'y' structure, not the base class 'x'. Obviously
minor and low priority, but more less helpful if y is a deep derived class.
>From gcc-bugs-return-630972-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 23:28:53 2019
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Subject: [Bug c++/89068] Nested inline anonymous namespaces are erroneously reported as conflicting
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |mpolacek at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Already fixed by r264016 which was backported to 8, too.
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From: "peter at cordes dot ca" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/89063] [x86] lack of support for BEXTR from BMI extension
Date: Fri, 25 Jan 2019 23:50:00 -0000
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Peter Cordes <peter at cordes dot ca> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |peter at cordes dot ca
--- Comment #1 from Peter Cordes <peter at cordes dot ca> ---
Unfortunately Intel Haswell/Skylake implement BEXTR as 2 uops with 2c latency.
Presumably those uops are a shift + bzhi, so 1p06 + 1p15 would explain Agner
Fog's experimental result of 2p0156 for BEXTR, with 0.5c throughput.
On AMD Excavator/Ryzen, it's 1 uop with 1c latency. On Steamroller and
earlier, it's 2 uops but 1c latency. (I assume that's latency from the
non-control input to the output. So maybe one of the uops pre-processes the
control input, otherwise you'd expect 2c latency from either operand.) Ryzen
dropped support for AMD TBM, so only Excavator (bdver4) has 1-uop bextr imm16
which would avoid the need for mov reg,imm32 with the control operand. But
mov-imm + bextr can still be a win on Ryzen, lower latency than RORX+AND
BMI2 RORX is single-uop on all CPUs that support it. If we already need a 2nd
uop to mask anyway, we can use RORX+AND-immediate to duplicate the
functionality and performance of BEXTR-immediate, with the smaller code-size if
the AND-mask fits in an imm8. (5+5 vs. 6+3 or 6+4 if the AND needs a REX)
Without an immediate-source BEXTR (like AMD TBM has/had), the only advantage
mov-immediate+bextr has (on Intel) over mov-reg+shift+and is that can deal with
wide bitfields using a count instead of an immediate AND mask. (Especially if
it doesn't fit in 32 bits).
If you can reuse the same control-register in a loop, BEXTR is good-ish for
copy-and-extract.
PEXT is 1 uop on Intel CPUs even though the simpler-looking BEXTR is 2. But
PEXT is extremely slow on Ryzen (7 uops, 18c lat and tput). So for 32-bit
constants at least, mov r32,imm32 + PEXT to copy-and-extract is better than
BEXTR on Intel. movabs imm64 is too big and can cause front-end problems
(slower to read from the uop cache, if that effect from Sandybridge is still
present on Haswell/Skylake), and has no advantage vs. RORX + AND unless the
bitfield you're extracting is wider than 32 bits.
PEXT has 3 cycle latency, though, and can only run on port 1 on SnB-family.
(All integer uops with latency > 1 are p1-only). It's potentially good for
throughput, but worse than RORX+AND for latency.
Unfortunately x86 bitfield instructions are pretty weak compared to ARM /
AArch64 ubfx or PowerPC rlwinm and friends, where the bit-positions are simply
specified as immediates. Only AMD's immediate version of BEXTR (1 uop on
Excavator) matched them. Having a bunch of different control operands for
BEXTR or PEXT in registers might be usable in a loop, but a lot more rarely
useful than immediate controls.
----
0000000000000000 <extract_skylake_hand_optimized>:
0: c4 e3 fb f0 c7 2a rorx $0x2a,%rdi,%rax # $(64-22)
6: c4 e3 fb f0 d7 35 rorx $0x35,%rdi,%rdx # $(64-11)
c: 83 e7 3f and $0x3f,%edi
f: 83 e0 3f and $0x3f,%eax
12: 83 e2 3f and $0x3f,%edx
15: 01 f8 add %edi,%eax # 32-bit operand-size
because we can prove it can't overflow
17: 01 d0 add %edx,%eax # missed optimization in
both gcc's versions.
19: c3 retq
Not counting the ret, this is 7 uops for Skylake and Ryzen. **I'm pretty sure
this is our best bet for -march=skylake, and for tune=generic -mbmi2**
The BEXT intrinsics version is 9 uops for SKL, 7 for Ryzen, but is 2 bytes
larger. (not counting the savings from avoiding a REX prefix on the ADD
instructions; that missed optimization applies equally to both.) OTOH, the
critical path latency for BEXTR on Ryzen is better by 1 cycle, so we could
still consider it for -march=znver1. Or for tune=generic -mbmi without BMI2.
The legacy mov+shr+and version is 10 uops because gcc wasted a `mov %rdi,%rax`
instruction; it *should* be 9 uops for all normal CPUs.
---
With only BMI1 but not BMI2 enabled, we should probably use the mov-imm + BEXTR
version. It's not worse than the mov+shr+and version on SnB-family or bd/zn,
and it's better on some AMD. And it's probably smaller code-size.
And in future if Intel designs CPUs that can handle BEXTR as a single uop with
1c latency, mov+bextr will become good-ish everywhere.
For code-size, BEXTR has a definite advantage for bitfields wider than 1 byte,
because AND $imm32, %r32 is 6 bytes long instead of 3.
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From: "antony at cosmologist dot info" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/89069] New: ICE in select type with function returning class array pointer
Date: Fri, 25 Jan 2019 23:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89069
Bug ID: 89069
Summary: ICE in select type with function returning class array
pointer
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: antony at cosmologist dot info
Target Milestone: ---
Follow up to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87566, seg fault ICE
with gfortran 6.5-9.0
module test
contains
function getP()
class(*), pointer :: getP(:)
end function getP
subroutine SegFaulter()
class(*), pointer :: Pt => null()
select type (P=>getP())
type is (real)
end select
end subroutine
end module test
>From gcc-bugs-return-630975-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 25 23:58:55 2019
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From: "antony at cosmologist dot info" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/87566] ICE with class(*) and select
Date: Fri, 25 Jan 2019 23:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87566
--- Comment #11 from Antony Lewis <antony at cosmologist dot info> ---
I posted remaining ICE in 9.0.0 20190119 as
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89069
>From gcc-bugs-return-630976-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Jan 26 00:09:35 2019
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Subject: Available Funds for Investment!
To: <gcc-bugs@gcc.gnu.org>
From: johannreimann <mail@eventclass.com>
Date: Sat, 26 Jan 2019 00:09:00 -0000
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