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* [Bug tree-optimization/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
[not found] <bug-83359-4@http.gcc.gnu.org/bugzilla/>
@ 2017-12-11 10:41 ` rguenther at suse dot de
0 siblings, 0 replies; only message in thread
From: rguenther at suse dot de @ 2017-12-11 10:41 UTC (permalink / raw)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83359
--- Comment #4 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 11 Dec 2017, amker at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83359
>
> --- Comment #3 from amker at gcc dot gnu.org ---
> (In reply to Richard Biener from comment #2)
> > Both loops guarded by the IFN are parallelized with the loop noted by
> > the IFN outlined and the autopar scalar copy being a new loop.
> >
> > Not sure what to do best, eventually not processing those loops with
> > GRAPHITE/autopar and/or being more rigid in throwing it away. In theory
> > expanding the IFN as just its arg is valid.
>
> In current logic, we only keep distribution if it enables vectorization, one
> possible fix is we also keep it if parallelization is enabled. That is,
> resolve IFN_DIST call and keep the distribution in parallelization. Does this
> make sense?
I guess so, but I'd like to investigate this a bit more. One issue
is we outline the loop we reference from the IFN with parallelization,
this might be a strong enough hint to remove the IFN from autopar.
>From gcc-bugs-return-584795-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 10:48:47 2017
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From: "amker at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83320] Mismatched free() / delete / delete [] in gimple-loop-interchange.cc:948
Date: Mon, 11 Dec 2017 10:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83320
--- Comment #3 from amker at gcc dot gnu.org ---
Author: amker
Date: Mon Dec 11 10:47:53 2017
New Revision: 255539
URL: https://gcc.gnu.org/viewcvs?rev=255539&root=gcc&view=rev
Log:
PR tree-optimization/83320
* gimple-loop-interchange.cc (free_data_refs_with_aux): Use delete.
(prune_datarefs_not_in_loop): Ditto.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gimple-loop-interchange.cc
>From gcc-bugs-return-584796-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 10:49:19 2017
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Subject: [Bug libstdc++/68519] condition_variable::wait_for does not work properly with float duration
Date: Mon, 11 Dec 2017 10:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68519
Adrien <jdbleretour at free dot fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jdbleretour at free dot fr
--- Comment #5 from Adrien <jdbleretour at free dot fr> ---
Still not working properly:
https://stackoverflow.com/questions/47744331/condition-variable-not-waking-up-when-used-with-a-chronodurationfloat
>From gcc-bugs-return-584797-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 10:52:12 2017
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Subject: [Bug libstdc++/68519] condition_variable::wait_for does not work properly with float duration
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That's why the bug is still open.
>From gcc-bugs-return-584798-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 10:54:49 2017
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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/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 10:54:00 -0000
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 42830
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42830&action=edit
gcc8-pr83359.patch
In the mean time I wrote this patch.
That said, LOOP_DIST_ALIAS seems quite fragile to me, unlike ifcvt added
LOOP_VECTORIZED calls which go away in the very next pass, there are many
passes in between ldist and vectorizer and I'd be worried that the calls could
be cloned with other loop copying, moved and all other kinds of things,
especially in graphite.
>From gcc-bugs-return-584799-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 10:56:29 2017
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Subject: [Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)
Date: Mon, 11 Dec 2017 10:56:00 -0000
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--- Comment #19 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
-m{cpu,tune,arch}=native are hosted-only flags that mean look-up the
architecture on the machine I'm running on now. They are not supported at all
on cross compilers. This is translated by the driver into the real
-m{cpu,tune,arch} flag that gets passed to the compiler proper, which is why
you see it changed by the help information.
-mfpu=auto means use the floating-point unit implied by -mcpu/-march flags.
This works even if on a cross compiler. -mfpu=auto != -mfpu=native. There
never has been a -mfpu=native option and now we have -mfpu=auto we don't need
one. -mfpu=auto is not translated by the driver; it's used in the compiler
proper to control where the selected FPU information is looked up (directly or
from the architecture specification).
>From gcc-bugs-return-584800-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 11:00:56 2017
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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/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 11:00:00 -0000
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #5)
> Created attachment 42830 [details]
> gcc8-pr83359.patch
>
> In the mean time I wrote this patch.
>
> That said, LOOP_DIST_ALIAS seems quite fragile to me, unlike ifcvt added
> LOOP_VECTORIZED calls which go away in the very next pass, there are many
> passes in between ldist and vectorizer and I'd be worried that the calls
> could be cloned with other loop copying, moved and all other kinds of
> things, especially in graphite.
IMHO given it's fragility we should see to tame it down for the release
with either folding the remaining calls during fold-all-builtins or
replacing expand_LOOP_DIST_ALIAS with code that does in fact expand
the function (to its boolean argument).
expand_LOOP_DIST_ALIAS should then emit a note in the .expand dump so
we can track the cases we leak it.
>From gcc-bugs-return-584801-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 11:11:51 2017
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Subject: [Bug tree-optimization/83320] Mismatched free() / delete / delete [] in gimple-loop-interchange.cc:948
Date: Mon, 11 Dec 2017 11:11:00 -0000
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Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Fixed. Thanks.
>From gcc-bugs-return-584802-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 11:21:45 2017
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83361] New: [8 Regression] ICE: verify_flow_info failed (error: non-cold basic block 3 reachable only by paths crossing the cold partition) on 32-bit BE powerpc targets
Date: Mon, 11 Dec 2017 11:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83361
Bug ID: 83361
Summary: [8 Regression] ICE: verify_flow_info failed (error:
non-cold basic block 3 reachable only by paths
crossing the cold partition) on 32-bit BE powerpc
targets
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: powerpc-*-linux-gnu, powerpcspe-*-linux-gnu
gcc-8.0.0-alpha20171210 snapshot (r255534) ICEs when compiling the following
snippet w/ -O2 (-O3, -Ofast) -freorder-blocks-and-partition:
#include <limits.h>
int yz;
void
tq (int z3)
{
unsigned long long int n8 = (unsigned long long int)INT_MAX + 1;
int *ey = &yz;
if (yz == 0)
{
int bc;
yz = 1;
while (yz != 0)
{
*ey *= bc;
n8 = !!(1 / ((unsigned long long int)yz == n8));
ey = &z3;
}
while (z3 != 0)
{
}
}
z3 = (n8 != 0) && (*ey != 0);
z3 = yz / z3;
if (z3 < 0)
{
if (yz != 0)
yz = 0;
yz /= 0;
}
}
% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20171210 -O2
-freorder-blocks-and-partition -w -c yb4mx7hn.c
yb4mx7hn.c: In function 'tq':
yb4mx7hn.c:36:1: error: non-cold basic block 3 reachable only by paths crossing
the cold partition
}
^
during RTL pass: ce3
yb4mx7hn.c:36:1: internal compiler error: verify_flow_info failed
0x71c61a verify_flow_info()
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171210/work/gcc-8-20171210/gcc/cfghooks.c:265
0x13db5d8 checking_verify_flow_info
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171210/work/gcc-8-20171210/gcc/cfghooks.h:198
0x13db5d8 if_convert
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171210/work/gcc-8-20171210/gcc/ifcvt.c:5449
0x13dd2fc execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171210/work/gcc-8-20171210/gcc/ifcvt.c:5549
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Subject: [Bug rtl-optimization/81559] ICE: verify_flow_info failed (error: non-cold basic block 4 reachable only by paths crossing the cold partition) on 32-bit BE powerpc target
Date: Mon, 11 Dec 2017 11:22:00 -0000
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Arseny Solokha <asolokha at gmx dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Arseny Solokha <asolokha at gmx dot com> ---
Closing in favor of PR83361, then.
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Subject: [Bug tree-optimization/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 11:39:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #42830|0 |1
is obsolete| |
CC| |jakub at gcc dot gnu.org
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 42831
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42831&action=edit
gcc8-pr83359.patch
Updated patch.
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Subject: [Bug tree-optimization/83362] New: [8 Regression] wrong code at -O1
Date: Mon, 11 Dec 2017 11:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83362
Bug ID: 83362
Summary: [8 Regression] wrong code at -O1
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: wrong-code
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Priority: P3
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Created attachment 42832
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42832&action=edit
reduced testcase
Output:
$ x86_64-pc-linux-gnu-gcc -O1 testcase.c
$ ./a.out
Aborted
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-255464-checking-yes-rtl-df-extra-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--without-cloog --without-ppl --without-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-255464-checking-yes-rtl-df-extra-nographite-amd64
Thread model: posix
gcc version 8.0.0 20171207 (experimental) (GCC)
All tested targets (arm, powerpc, x86) seem to be affected.
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Subject: [Bug middle-end/83239] False positive from -Wstringop-overflow on simple std::vector code
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--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #12)
> I was looking at this again tonight, and I clearly missed the interaction
> between known ranges and the overflow check.
>
> If we look at the .vrp1 dump we see this overflow check in bb16:
>
> 23 = ASSERT_EXPR <_13, _13 > 2>;
> _1 = _23 + 18446744073709551614;
> if (_1 > _23)
> goto <bb 17>; [33.00%]
> else
> goto <bb 41>; [67.00%]
>
> This is a controlling condition for the clearing loop which ldist will turn
> into a memset.
>
> The range for _23 is:
>
> (gdb) p debug_value_range (get_value_range (gimple_cond_rhs (stmt)))
> [3, +INF] EQUIVALENCES: { _13 } (1 elements)
>
> Exactly what we'd expect given the ASSERT_EXPR. So far so good.
>
> The condition can be rewritten as _23 - 2 > _23, which is only going to be
> true if _23 has the value 0 or 1. So we can deduce that the condition is
> always false.
>
> We're correctly identifying the test as an overflow check in VRP, but we're
> not optimizing it. I think we just need to extend
> vr_values::vrp_evaluate_conditional_warnv_with_ops and the right things
> should just happen.
In fact if we'd do it like EVRP (set SSA_NAME_RANGE_INFO) then IMHO
stmt folding via gimple_fold_stmt_to_constant_1 should handle it
without adding "tricks" to vrp_evaluate_conditional_warnv_with_ops.
That said, this function should likely call match-and-simplify somehow
(note that match.pd lacks a pattern that would simplify the above with
range information).
That said, doing this somewhere more generic (match.pd) might be better,
though VRP not setting range-info during propagation might make things
harder here.
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Subject: [Bug tree-optimization/83363] New: [8 Regression] wrong code at -O2 -fno-forward-propagate
Date: Mon, 11 Dec 2017 12:02:00 -0000
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Bug ID: 83363
Summary: [8 Regression] wrong code at -O2
-fno-forward-propagate
Product: gcc
Version: 8.0
Status: UNCONFIRMED
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Severity: normal
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Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 42833
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42833&action=edit
reduced testcase
Output:
$ x86_64-pc-linux-gnu-gcc -O2 -fno-forward-propagate testcase.c
$ ./a.out
Aborted
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-255464-checking-yes-rtl-df-extra-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--without-cloog --without-ppl --without-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-255464-checking-yes-rtl-df-extra-nographite-amd64
Thread model: posix
gcc version 8.0.0 20171207 (experimental) (GCC)
>From gcc-bugs-return-584808-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 12:07:06 2017
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 12:07:00 -0000
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--- Comment #8 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 11 Dec 2017, jakub at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83359
>
> Jakub Jelinek <jakub at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> Attachment #42830|0 |1
> is obsolete| |
> CC| |jakub at gcc dot gnu.org
>
> --- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Created attachment 42831
> --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42831&action=edit
> gcc8-pr83359.patch
>
> Updated patch.
LGTM, find_loop_dist_alias (basic_block bb) in tree-cfg.c looks unused
now.
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Subject: [Bug tree-optimization/83363] [8 Regression] wrong code at -O2 -fno-forward-propagate
Date: Mon, 11 Dec 2017 12:08:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/83362] [8 Regression] wrong code at -O1
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Subject: [Bug tree-optimization/83361] [8 Regression] ICE: verify_flow_info failed (error: non-cold basic block 3 reachable only by paths crossing the cold partition) on 32-bit BE powerpc targets
Date: Mon, 11 Dec 2017 12:08:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-584812-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 12:12:56 2017
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Subject: [Bug tree-optimization/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 12:12:00 -0000
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
No, it is used (twice). And this function isn't too similar to the one that
the vectorizer uses.
>From gcc-bugs-return-584813-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 12:16:22 2017
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Subject: [Bug tree-optimization/83359] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2362
Date: Mon, 11 Dec 2017 12:16:00 -0000
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--- Comment #10 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 11 Dec 2017, jakub at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83359
>
> --- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> No, it is used (twice). And this function isn't too similar to the one that
> the vectorizer uses.
Ah, indeed.
>From gcc-bugs-return-584814-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 12:29:42 2017
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Subject: [Bug tree-optimization/83364] New: [8 Regression] wrong code with -O -fno-forward-propagate -fno-tree-coalesce-vars -fno-tree-ter
Date: Mon, 11 Dec 2017 12:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83364
Bug ID: 83364
Summary: [8 Regression] wrong code with -O
-fno-forward-propagate -fno-tree-coalesce-vars
-fno-tree-ter
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 42834
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42834&action=edit
reduced testcase
Output:
$ x86_64-pc-linux-gnu-gcc -w -O -fno-forward-propagate -fno-tree-coalesce-vars
-fno-tree-ter testcase.c
$ ./a.out
Aborted
$ /repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-255464-checking-yes-rtl-df-extra-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--without-cloog --without-ppl --without-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-255464-checking-yes-rtl-df-extra-nographite-amd64
Thread model: posix
gcc version 8.0.0 20171207 (experimental) (GCC)
>From gcc-bugs-return-584815-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 12:35:23 2017
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Subject: [Bug target/83334] __builtin_ms_va_copy used in function with sysv_abi is broken
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Is this a dup of PR 50818?
>From gcc-bugs-return-584816-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 12:38:26 2017
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/80645] FAIL: gfortran.dg/elemental_subroutine_3.f90 -O1 (test for excess errors)
Date: Mon, 11 Dec 2017 12:38:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
Looking again for the issue in the original report (the comment#1 issue has
been fixed):
arg:0 <var_decl 0x7ffff7fee5a0 x type <array_type 0x7ffff69a4930>
addressable used static decl_0 BLK
/space/rguenther/src/svn/trunk2/gcc/testsuite/gfortran.dg/elemental_subroutine_3.f90:29:0
size <integer_cst 0x7ffff697d930 192> unit-size <integer_cst 0x7ffff699c588 24>
and we warn about
__builtin_memcpy (_153, &MEM[(void *)&x + 16B], 12)
with x having size 24 there's not 12 bytes at &x + 16. It is DSE3 first
having the size of 12 here:
<bb 18> [local count: 20817692]:
_95 = __builtin_malloc (16);
- __builtin_memcpy (_95, &x[3], 16);
+ _153 = _95 + 4;
+ __builtin_memcpy (_153, &MEM[(void *)&x + 16B], 12);
this is from the following code in .original:
parm.11.dtype = 297;
parm.11.dim[0].lbound = 0;
parm.11.dim[0].ubound = 3;
parm.11.dim[0].stride = -1;
parm.11.data = (void *) &x[3];
parm.11.offset = 0;
typedef struct mytype [4];
...
data.13 = (struct mytype *) _gfortran_internal_pack (&parm.11);
if ((struct mytype[0:] *) parm.11.data == data.13)
{
{
void * restrict D.2228;
D.2228 = (void * restrict) __builtin_malloc (16);
data.13 = (struct mytype *) D.2228;
(void) __builtin_memcpy ((void *) data.13, parm.11.data, 16);
}
}
atmp.12.data = (void * restrict) data.13;
atmp.12.offset = 0;
{
integer(kind=8) S.14;
S.14 = 0;
while (1)
{
if (S.14 > 3) goto L.5;
{
integer(kind=4) D.2230;
D.2230 = (*(integer(kind=4)[0:] *)
parm.10.data)[parm.10.dim[0].stride * NON_LVALUE_EXPR <S.14>];
myassign (&(*(struct mytype[4] * restrict) atmp.12.data)[S.14],
&x[(integer(kind=8)) D.2230 + -1]);
}
S.14 = S.14 + 1;
}
L.5:;
so we somehow allocate a temporary for the view on the LHS even though
it is packed in-place (and later unpacked again) but somehow miscalculate
the size of the required temporary. Possibly because of the negative
stride.
x(4:1:-1) = x((/1,3,2,4/))
-> gfortran wrong-code bug. The reduced testcase from comment#10 does _not_
do this pack/unpack and temporary dance. Probably requires the myassign thing?
Fortran folks, please investigate again!
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Subject: [Bug c/83365] New: ice in interpret_rhs_expr, at tree-scalar-evolution.c:1775
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83365
Bug ID: 83365
Summary: ice in interpret_rhs_expr, at
tree-scalar-evolution.c:1775
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
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The following C code, when compiled by recent gcc trunk and compiler flag -O3,
does this:
during GIMPLE pass: linterchange
hack/hack.bones.c: In function ‘getbones’:
hack/hack.bones.c:154:1: internal compiler error: in interpret_rhs_expr, at
tree-scalar-evolution.c:1775
0xead827 interpret_rhs_expr
../../trunk/gcc/tree-scalar-evolution.c:1775
0xea9208 interpret_expr
../../trunk/gcc/tree-scalar-evolution.c:1991
0xea9208 analyze_scalar_evolution_1
../../trunk/gcc/tree-scalar-evolution.c:2026
0xeaa611 analyze_scalar_evolution(loop*, tree_node*)
../../trunk/gcc/tree-scalar-evolution.c:2113
The problem seems to occur between revisions 255402 and 255516.
C source code is
struct {
unsigned : 1;
unsigned a : 1
} b[];
c;
d() {
int e;
for (; e; e++) {
c = 0;
for (; c < 2; c++)
b[c].a = 0;
}
}
>From gcc-bugs-return-584818-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 12:50:46 2017
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Subject: [Bug c/83365] [8 Regression] ice in interpret_rhs_expr, at tree-scalar-evolution.c:1775
Date: Mon, 11 Dec 2017 12:50:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|ice in interpret_rhs_expr, |[8 Regression] ice in
|at |interpret_rhs_expr, at
|tree-scalar-evolution.c:177 |tree-scalar-evolution.c:177
|5 |5
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r255472. Better testcase:
struct {
unsigned : 1;
unsigned a : 1;
} b[1];
int c;
void
d() {
int e;
for (; e; e++) {
c = 0;
for (; c < 2; c++)
b[c].a = 0;
}
}
>From gcc-bugs-return-584819-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 12:56:28 2017
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Subject: [Bug fortran/83366] New: gfortran.dg/minval_char_2.f90 and gfortran.dg/maxval_char_2.f90 fail at random
Date: Mon, 11 Dec 2017 12:56:00 -0000
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Bug ID: 83366
Summary: gfortran.dg/minval_char_2.f90 and
gfortran.dg/maxval_char_2.f90 fail at random
Product: gcc
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On x86, I got random failures, like
Program aborted. Backtrace:
#0 0x400e33 in ???
#1 0x400b89 in ???
#2 0x7fabeab42ff9 in ???
#3 0x400bb9 in ???
#4 0xffffffffffffffff in ???
FAIL: gfortran.dg/maxval_char_2.f90 -Os execution test
>From gcc-bugs-return-584820-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:13:14 2017
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Subject: [Bug c/83347] write pointer to const string possible without warning
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=61579
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
See also bug 61579
>From gcc-bugs-return-584821-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:14:22 2017
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Subject: [Bug rtl-optimization/83367] New: static global constructors stack memory clobbering
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Bug ID: 83367
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Created attachment 42835
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42835&action=edit
I've combined three files here because Bugzilla does not support adding
multiple attachment files?
I spent several hours trying to reduce this to the most minimal test case I
could but the compiler is very picky about the static global constructors being
in their own translation unit to trigger the problems.
Test.cpp contains the core code for a "test" framework that accepts registering
tests and subtests through maintaining a static linked list as static global
constructors are invoked.
Test.h contains the definitions needed to define tests in a seperate
translation unit Tests.cpp (again because putting it inline the Test.cpp file
does not exibit the problem.)
Test.cpp contains a test + subtest that triggers the bug, however the
conditionally excluded equivlant example (avoiding cTestRegister) does not
exibit the problem either.
When you compile with -fsanitize=address asan reports stack memory corruption,
as does valgrind if you run it a couple times.
It should print "b\n\a\n", as it does with clang/msvc (at all optimization
levels) and gcc at -O0, any optimization level will lead to clobbering, garbage
output and in most cases Illegal instruction exceptions.
>From gcc-bugs-return-584822-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:21:38 2017
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Subject: [Bug target/81842] -fcf-protection -mcet is incompatible with makecontext family functions
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #42829|0 |1
is obsolete| |
--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 42836
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42836&action=edit
The new combined patch
>From gcc-bugs-return-584823-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:25:03 2017
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Subject: [Bug c/82179] Optionally compile free calls in such a way that the passed pointer is clobbered after the call
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
Given the retitling, I'll confirm this as an enhancement.
>From gcc-bugs-return-584824-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:29:37 2017
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Subject: [Bug middle-end/81889] [7/8 Regression] bogus warnings with -Wmaybe-uninitialized -O3
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #5)
> I wonder why forwprop doesn't simplify bb6 by pushing the RHS of the
> assignment to _40 into the use of _40 in the conditional.
>
> I'd guess the fortran front-end's boolean types are goofy and that's getting
> in the way of forwprop doing its job. It may be impeding other bits as well.
It is because we fold (_39 < 0) != 0 to (logical(kind=1)) (_39 >> 63) and
canonicalize_cond_expr_cond doesn't recognize that form.
Index: gcc/gimple.c
===================================================================
--- gcc/gimple.c (revision 255539)
+++ gcc/gimple.c (working copy)
@@ -2148,6 +2148,17 @@ canonicalize_cond_expr_cond (tree t)
else if (TREE_CODE (t) == BIT_XOR_EXPR)
t = build2 (NE_EXPR, TREE_TYPE (t),
TREE_OPERAND (t, 0), TREE_OPERAND (t, 1));
+ /* For (bool)(x >> 63) use x < 0. */
+ else if (CONVERT_EXPR_P (t)
+ && TREE_CODE (TREE_OPERAND (t, 0)) == RSHIFT_EXPR
+ && TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 1)) == INTEGER_CST
+ && ! TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (t, 0)))
+ && compare_tree_int (TREE_OPERAND (TREE_OPERAND (t, 0), 1),
+ TYPE_PRECISION
+ (TREE_TYPE (TREE_OPERAND (t, 0))) - 1) == 0)
+ t = build2 (LT_EXPR, TREE_TYPE (t),
+ TREE_OPERAND (TREE_OPERAND (t, 0), 0),
+ build_zero_cst (TREE_TYPE (TREE_OPERAND (t, 0))));
if (is_gimple_condexpr (t))
return t;
fixes that but not the warnings (didn't expect that). As suspected the array
accesses are introduced by cunroll. I'll see what to recover from there.
>From gcc-bugs-return-584825-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:35:33 2017
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Subject: [Bug tree-optimization/83362] [8 Regression] wrong code at -O1
Date: Mon, 11 Dec 2017 13:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83362
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems to have started with r255387.
>From gcc-bugs-return-584826-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:43:29 2017
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Subject: [Bug target/83368] New: alloca after setjmp breaks PIC base reg
Date: Mon, 11 Dec 2017 13:43:00 -0000
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Bug ID: 83368
Summary: alloca after setjmp breaks PIC base reg
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
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Priority: P3
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Assignee: unassigned at gcc dot gnu.org
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CC: glaubitz at physik dot fu-berlin.de
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Target: sparc64-linux-gnu
Created attachment 42837
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42837&action=edit
Testcase
If alloca is used after setjmp in the same function, upon longjmp'ing back, %l7
no longer has the correct value, but the generated code assumes it does, and
things break, typically by segfaulting (as in the attached example).
It seems this possibility is intended to be covered in sparc.md, as
builtin_setjmp_receiver has a call to load_got_register if flag_pic is true.
However, for whatever reason this doesn't seem to actually make a difference.
>From gcc-bugs-return-584827-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:49:20 2017
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Subject: [Bug c/83365] [8 Regression] ice in interpret_rhs_expr, at tree-scalar-evolution.c:1775
Date: Mon, 11 Dec 2017 13:49:00 -0000
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--- Comment #2 from amker at gcc dot gnu.org ---
Is this a duplicate of PR83337 thus fixed by Jakub?
>From gcc-bugs-return-584828-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 13:53:44 2017
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Subject: [Bug testsuite/82006] [8 Regression] ERROR: torture-init: torture_without_loops is not empty as expected
Date: Mon, 11 Dec 2017 13:53:00 -0000
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--- Comment #11 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
(In reply to Richard Biener from comment #10)
> Hmm, builtins.exp references $LTO_TORTURE_OPTIONS. Does the issue only
> reproduce with builtins.exp or also other .exp files?
As you see in comment 8 there are 14 .exp files showing an issue. A single one
showing "ERROR: can't read "testname_with_flags": no such variable", which is
builtins.exp. The other 13 ones all show "ERROR: torture-init:
torture_without_loops is not empty as expected". These 13 .exp files are:
ieee.exp
unsorted.exp
format.exp
pch.exp
sancov.exp
simulate-thread.exp
sso.exp
stackalign.exp
tls.exp
tsan.exp
i386-prefetch.exp
math-torture.exp
ppc-fortran.exp
>
> How does check_effective_target_lto behave on mingw32 currently?
How can I check this. Any hints?
>From gcc-bugs-return-584829-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 14:10:38 2017
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Subject: [Bug middle-end/81889] [7/8 Regression] bogus warnings with -Wmaybe-uninitialized -O3
Date: Mon, 11 Dec 2017 14:10:00 -0000
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 42838
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42838&action=edit
old non-functional patch
VRP1 has figured out ranges that bound the iteration of the loop in question
but there's too much stuff happening inbewteen that and cunrool to have any
hope to preserve it enough.
niter analysis would benefit from some ad-hoc walking of dominator stmts
like simplify_using_initial_conditions does for the purpose of figuring
an upper bound for the iteration... like the attached old non-functional
patch computing ranges for a GENERIC expr which nowadays should use
register_edge_assert_for () to get at "asserts" for conditions it visits
and extract_range_for_var_from_comparison_expr to get at range info.
That said, niter analysis might want to populate a sparse lattice of
ranges seeded by dominating conditions and propagate those via the suggested
recursion (lacking SSA use->def handling). Not sure if a sparse lattice
can be easily instantiated with the current vr_values class - it seems to
include lattice storage at the moment rather than abstracting that.
Note that re-ordering passes to somehow make VRP2 appear before cunroll
might also fix things but cunroll is in the loop pipeline and VRP2 is not.
Hacking things up so that early range info is copied/preserved enough might
be possible for this particular case.
>From gcc-bugs-return-584830-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 14:13:41 2017
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/82006] [8 Regression] ERROR: torture-init: torture_without_loops is not empty as expected
Date: Mon, 11 Dec 2017 14:13:00 -0000
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--- Comment #12 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 11 Dec 2017, rainer@emrich-ebersheim.de wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82006
>
> --- Comment #11 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
> (In reply to Richard Biener from comment #10)
> > Hmm, builtins.exp references $LTO_TORTURE_OPTIONS. Does the issue only
> > reproduce with builtins.exp or also other .exp files?
> As you see in comment 8 there are 14 .exp files showing an issue. A single one
> showing "ERROR: can't read "testname_with_flags": no such variable", which is
> builtins.exp. The other 13 ones all show "ERROR: torture-init:
> torture_without_loops is not empty as expected". These 13 .exp files are:
> ieee.exp
> unsorted.exp
> format.exp
> pch.exp
> sancov.exp
> simulate-thread.exp
> sso.exp
> stackalign.exp
> tls.exp
> tsan.exp
> i386-prefetch.exp
> math-torture.exp
> ppc-fortran.exp
>
> >
> > How does check_effective_target_lto behave on mingw32 currently?
> How can I check this. Any hints?
No idea for details but when running lto.exp I see
Executing on host: /home/abuild/rguenther/trunk2-g/gcc/xgcc
-B/home/abuild/rguenther/trunk2-g/gcc/ -fno-diagnostics-show-caret
-fdiagnostics-color=never -flto -c -o lto19653.o lto19653.c (timeout
= 300)
spawn /home/abuild/rguenther/trunk2-g/gcc/xgcc
-B/home/abuild/rguenther/trunk2-g/gcc/ -fno-diagnostics-show-caret
-fdiagnostics-color=never -flto -c -o lto19653.o lto19653.c^M
Executing on host: /home/abuild/rguenther/trunk2-g/gcc/xgcc
-B/home/abuild/rguenther/trunk2-g/gcc/ linker_plugin19653.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -flto
-fuse-linker-plugin -lm -o linker_plugin19653.exe (timeout = 300)
spawn /home/abuild/rguenther/trunk2-g/gcc/xgcc
-B/home/abuild/rguenther/trunk2-g/gcc/ linker_plugin19653.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -flto
-fuse-linker-plugin -lm -o linker_plugin19653.exe^M
Executing on host: /home/abuild/rguenther/trunk2-g/gcc/xgcc
-B/home/abuild/rguenther/trunk2-g/gcc/ linker_plugin19653.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -flto
-fuse-linker-plugin -o linker_plugin19653.exe (timeout = 300)
...
those appear to be from the lto and linker-plugin meta-testing.
>From gcc-bugs-return-584831-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 14:14:43 2017
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/83367] static global constructors stack memory corruption
Date: Mon, 11 Dec 2017 14:14:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I wonder if a temporary is not being bound so it is considered going out of
scope.
>From gcc-bugs-return-584832-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 14:16:10 2017
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From: "zenith432 at users dot sourceforge.net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/83334] __builtin_ms_va_copy used in function with sysv_abi is broken
Date: Mon, 11 Dec 2017 14:16:00 -0000
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--- Comment #4 from zenith432 at users dot sourceforge.net ---
It's not PR 50818
Here's the source code for sample1
=====
#include <stdio.h>
#define MS_ABI __attribute__((ms_abi))
int funcc(int c, __builtin_ms_va_list ap)
{
int i, s;
for (s = 0, i = 0; i < c; ++i)
s += __builtin_va_arg(ap, int);
return s;
}
int funcb(int c, __builtin_ms_va_list ap)
{
__builtin_ms_va_list ap2;
int r;
__builtin_ms_va_copy(ap2, ap);
r = funcc(c, ap2);
__builtin_ms_va_end(ap2);
return r;
}
int MS_ABI funca(int c, ...)
{
__builtin_ms_va_list ap;
int r;
__builtin_ms_va_start(ap, c);
r = funcb(c, ap);
__builtin_ms_va_end(ap);
return r;
}
int main(int argc, char** argv)
{
printf("%d\n", funca(3, 1, 2, 3));
return 0;
}
=====
funcb is a sysv-abi function that obtains an explicitly typed
__builtin_ms_va_list as a parameter. The code generated for its invocation of
__builtin_ms_va_copy is incorrect. I didn't attach the object code, but can be
easily obtained with objdump -d.
PR 50818 began in 2011 as a bug report because at the time the __builtin_ms_va*
family didn't exist. In code compiled with -mabi=sysv, there was no way to
handle varargs inside a function defined as __attribute__((ms_abi)).
Nowadays, the __builtin_ms_va* family exists, so what remains of
PR 50818 is a feature request that __builtin_va* family behave like the ABI of
the function it is embedded in instead of according to the global -mabi.
This report is about...
- Passing a __builtin_ms_va_list to a sysv_abi function ... works!
- Calling __builtin_var_arg on a __builtin_ms_va_list inside a sysv_abi
function ... works!
- Calling __builtin_ms_va_copy on a __builtin_ms_va_list inside a sysv_abi
function... doesn't work.
Is this a bug? An unimplemented feature? It's your call.
>From gcc-bugs-return-584833-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 14:22:15 2017
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From: "hubicka at ucw dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83358] [8 Regression] division not converted with Intel tuning since r253934
Date: Mon, 11 Dec 2017 14:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83358
--- Comment #3 from Jan Hubicka <hubicka at ucw dot cz> ---
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83358
>
> --- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
> The following fixes this particular issue:
>
> diff --git a/gcc/config/i386/x86-tune-costs.h
> b/gcc/config/i386/x86-tune-costs.h
> index 312467d9788..00f1dae9085 100644
> --- a/gcc/config/i386/x86-tune-costs.h
> +++ b/gcc/config/i386/x86-tune-costs.h
> @@ -2345,7 +2345,7 @@ struct processor_costs core_cost = {
> {COSTS_N_INSNS (8), /* cost of a divide/mod for QI */
> COSTS_N_INSNS (8), /* HI */
> /* 8-11 */
> - COSTS_N_INSNS (11), /* SI */
> + COSTS_N_INSNS (13), /* SI */
> /* 24-81 */
> COSTS_N_INSNS (81), /* DI */
> COSTS_N_INSNS (81)}, /*
> other */
>
> Perhaps the div costs are a bit too tight in general?
The main problem here is that the algorithm expading div/mod into shift/add/lea
does not consider at all the parallelism and thus the cost model is not
realistic.
I meant to write bencmark that will try different constatns and see if they are
after by idiv or by expanded sequence.
The original costs was still based on pentium4, so I brought them to be
consistently
basedd on latencies.
Increasing values bit over the estimated latencies (with comment on why that
was done)
is perhaps easiest short term solution.
Honza
>From gcc-bugs-return-584834-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 14:34:41 2017
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Subject: [Bug middle-end/81889] [7/8 Regression] bogus warnings with -Wmaybe-uninitialized -O3
Date: Mon, 11 Dec 2017 14:34:00 -0000
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Specifically it is PRE code hoisting hoisting (integer(kind=8)) _2 above
if (_2 > 3) making it impossible to set a SSA range info on it.
At cunroll time we still have somewhat useful info on other SSA names in
the loop:
<bb 12> [local count: 912680545]:
# val.11_94 = PHI <0.0(17), val.11_56(20)>
# RANGE [1, 17] NONZERO 7
# S.12_93 = PHI <1(17), S.12_57(20)>
# RANGE [0, 2] NONZERO 3
_16 = S.12_93 + -1;
_17 = xx[_16];
val.11_56 = _17 + val.11_94;
# RANGE [2, 4] NONZERO 7
S.12_57 = S.12_93 + 1;
if (S.12_57 > _106)
goto <bb 26>; [15.00%]
else
goto <bb 20>; [85.00%]
<bb 26> [local count: 136902080]:
# val.11_122 = PHI <val.11_56(12)>
goto <bb 13>; [100.00%]
specifically the range info on S.12 (even if somewhat strange) could be used
to derive a range "backwards" for the number of iterations from base and step
from the increment stmt for example.
Thus for example the following fixes the testcase and exploits any
range info on undefined overflow stmts. Giving that wider testing.
Index: gcc/tree-ssa-loop-niter.c
===================================================================
--- gcc/tree-ssa-loop-niter.c (revision 255539)
+++ gcc/tree-ssa-loop-niter.c (working copy)
@@ -3510,6 +3510,12 @@ infer_loop_bounds_from_signedness (struc
low = lower_bound_in_type (type, type);
high = upper_bound_in_type (type, type);
+ wide_int minv, maxv;
+ if (get_range_info (def, &minv, &maxv) == VR_RANGE)
+ {
+ low = wide_int_to_tree (type, minv);
+ high = wide_int_to_tree (type, maxv);
+ }
record_nonwrapping_iv (loop, base, step, stmt, low, high, false, true);
}
>From gcc-bugs-return-584835-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 14:41:38 2017
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Subject: [Bug tree-optimization/83361] [8 Regression] ICE: verify_flow_info failed (error: non-cold basic block 3 reachable only by paths crossing the cold partition) on 32-bit BE powerpc targets
Date: Mon, 11 Dec 2017 14:41:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
Ever confirmed|0 |1
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Confirmed, doesn't need any special options (just -m32
-freorder-blocks-and-partition).
>From gcc-bugs-return-584836-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 14:58:02 2017
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/83362] [8 Regression] wrong code at -O1
Date: Mon, 11 Dec 2017 14:58:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at redhat dot com
Assignee|unassigned at gcc dot gnu.org |law at redhat dot com
--- Comment #2 from Jeffrey A. Law <law at redhat dot com> ---
Likely the same thing I'm already tracking via a P1 regression related to that
change.
>From gcc-bugs-return-584837-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:06:47 2017
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From: "bugzilla@poradnik-webmastera.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/83369] New: Missing diagnostics during inlining
Date: Mon, 11 Dec 2017 15:06:00 -0000
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Bug ID: 83369
Summary: Missing diagnostics during inlining
Product: gcc
Version: 8.0
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When code below is compiled, gcc prints warnings that null is passed to
function with nonnull attribute. However gcc does not point that error is
caused by inlining of my_strcpy at line 32 of test.cc.
Code was compiled using gcc (GCC) 8.0.0 20171210 (experimental).
[code]
#include <string.h>
char buf[100];
struct Test
{
const char* s1;
const char* s2;
};
__attribute((nonnull(1, 2)))
inline char* my_strcpy(char* __restrict__ dst, const char* __restrict__ src,
size_t size)
{
size_t len = strlen(src);
if (len < size)
memcpy(dst, src, len + 1);
else
{
memcpy(dst, src, size - 1);
dst[size - 1] = '\0';
}
return dst;
}
void test(Test* test)
{
if (test->s1)
my_strcpy(buf, test->s1, sizeof(buf));
else if (test->s2)
my_strcpy(buf, test->s2, sizeof(buf));
else
my_strcpy(buf, test->s2, sizeof(buf)); // error, line 32
}
[/code]
[out]
$ g++ -c -o test.o test.cc -O2 -Wall
test.cc: In function ‘void test(Test*)’:
test.cc:14:24: warning: argument 1 null where non-null expected [-Wnonnull]
size_t len = strlen(src);
~~~~~~^~~~~
In file included from test.cc:1:
/usr/include/string.h:395:15: note: in a call to function ‘size_t strlen(const
char*)’ declared here
extern size_t strlen (const char *__s)
^~~~~~
test.cc:16:15: warning: argument 2 null where non-null expected [-Wnonnull]
memcpy(dst, src, len + 1);
~~~~~~^~~~~~~~~~~~~~~~~~~
In file included from test.cc:1:
/usr/include/string.h:42:14: note: in a call to function ‘void* memcpy(void*,
const void*, size_t)’ declared here
extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
^~~~~~
test.cc:19:15: warning: argument 2 null where non-null expected [-Wnonnull]
memcpy(dst, src, size - 1);
~~~~~~^~~~~~~~~~~~~~~~~~~~
In file included from test.cc:1:
/usr/include/string.h:42:14: note: in a call to function ‘void* memcpy(void*,
const void*, size_t)’ declared here
extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
^~~~~~
[/out]
>From gcc-bugs-return-584838-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:20:32 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83370] New: [AARCH64]Tailcall register may be corrupted by epilogue code
Date: Mon, 11 Dec 2017 15:20:00 -0000
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Bug ID: 83370
Summary: [AARCH64]Tailcall register may be corrupted by
epilogue code
Product: gcc
Version: 8.0
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The following example generates incorrect code:
void (*f)();
int xx;
void tailcall (int i)
{
int arr[5000];
xx = arr[i];
f();
}
When built with -O2 -ffixed-x0 -ffixed-x1 -ffixed-x2 -ffixed-x3 -ffixed-x4
-ffixed-x5 -ffixed-x6 -ffixed-x7 -ffixed-x8 -ffixed-x9 -ffixed-x10 -ffixed-x11
-ffixed-x12 -ffixed-x13 -ffixed-x14 -ffixed-x15 -ffixed-x17 -ffixed-x18
tailcall:
mov x16, 20016
sub sp, sp, x16
adrp x16, .LANCHOR0
stp x19, x30, [sp]
add x19, sp, 16
ldr s0, [x19, w0, sxtw 2]
ldp x19, x30, [sp]
str s0, [x16, #:lo12:.LANCHOR0]
mov x16, 20016
add sp, sp, x16
br x16 // oops
So the issue is there is nothing in the tail call instruction that prevents it
from using IP0/IP1 which are used as temporaries in the epilogue. We use the
temporary for frames of 4-64KB, so this issue is more likely today (previously
temporary was used only in frames larger than 16MBytes).
The problem appears to be that while we have explicit clobbers in a tailcall,
they are after the call, not before it:
(call_insn/j 16 12 17 2 (parallel [
(call (mem:DI (reg/f:DI 84 [ f ]) [0 *f.0_2 S8 A8])
(const_int 0 [0]))
(return)
]) "tailcall.c":13 42 {*sibcall_insn}
(expr_list:REG_DEAD (reg/f:DI 84 [ f ])
(expr_list:REG_CALL_DECL (nil)
(nil)))
(expr_list (clobber (reg:DI 17 x17))
(expr_list (clobber (reg:DI 16 x16))
(nil))))
This issues affects gcc-5, gcc-6, gcc-7 and current trunk.
>From gcc-bugs-return-584839-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:33:52 2017
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Subject: [Bug tree-optimization/83364] [8 Regression] wrong code with -O -fno-forward-propagate -fno-tree-coalesce-vars -fno-tree-ter
Date: Mon, 11 Dec 2017 15:33:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Target Milestone|--- |8.0
>From gcc-bugs-return-584841-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:34:48 2017
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Subject: [Bug tree-optimization/83337] [8 Regression] ICE at -O3 x86_64-linux-gnu: in interpret_rhs_expr, at tree-scalar-evolution.c:1775
Date: Mon, 11 Dec 2017 15:34:00 -0000
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 83365 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-584840-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:34:48 2017
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Subject: [Bug c/83365] [8 Regression] ice in interpret_rhs_expr, at tree-scalar-evolution.c:1775
Date: Mon, 11 Dec 2017 15:34:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
It is.
*** This bug has been marked as a duplicate of bug 83337 ***
>From gcc-bugs-return-584842-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:35:51 2017
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Subject: [Bug rtl-optimization/83367] static global constructors stack memory corruption
Date: Mon, 11 Dec 2017 15:35:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Try -fno-lifetime-dse?
>From gcc-bugs-return-584843-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:42:29 2017
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/83361] [8 Regression] ICE: verify_flow_info failed (error: non-cold basic block 3 reachable only by paths crossing the cold partition) on 32-bit BE powerpc targets
Date: Mon, 11 Dec 2017 15:42:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |segher at gcc dot gnu.org
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I have a patch.
>From gcc-bugs-return-584844-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:42:48 2017
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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/83369] Missing diagnostics during inlining
Date: Mon, 11 Dec 2017 15:42:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2017-12-11
CC| |msebor at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.
Now that the warning diagnostic supports the %G directive the warning call can
be adjusted to make use of it to produce the following output. Let me post a
patch with the fix.
In function ‘char* my_strcpy(char*, const char*, size_t)’,
inlined from ‘void test(Test*)’ at pr83369.c:32:18:
pr83369.c:14:24: warning: argument 1 null where non-null expected [-Wnonnull]
size_t len = strlen(src);
~~~~~~^~~~~
In file included from pr83369.c:1:
/usr/include/string.h: In function ‘void test(Test*)’:
/usr/include/string.h:394:15: note: in a call to function ‘size_t strlen(const
char*)’ declared here
extern size_t strlen (const char *__s)
^~~~~~
In function ‘char* my_strcpy(char*, const char*, size_t)’,
inlined from ‘void test(Test*)’ at pr83369.c:32:18:
pr83369.c:16:15: warning: argument 2 null where non-null expected [-Wnonnull]
memcpy(dst, src, len + 1);
~~~~~~^~~~~~~~~~~~~~~~~~~
In file included from pr83369.c:1:
/usr/include/string.h: In function ‘void test(Test*)’:
/usr/include/string.h:42:14: note: in a call to function ‘void* memcpy(void*,
const void*, size_t)’ declared here
extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
^~~~~~
In function ‘char* my_strcpy(char*, const char*, size_t)’,
inlined from ‘void test(Test*)’ at pr83369.c:32:18:
pr83369.c:19:15: warning: argument 2 null where non-null expected [-Wnonnull]
memcpy(dst, src, size - 1);
~~~~~~^~~~~~~~~~~~~~~~~~~~
In file included from pr83369.c:1:
/usr/include/string.h: In function ‘void test(Test*)’:
/usr/include/string.h:42:14: note: in a call to function ‘void* memcpy(void*,
const void*, size_t)’ declared here
extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
^~~~~~
>From gcc-bugs-return-584845-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:45:49 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/83332] [8 regression] new test case gfortran.dg/vect/pr81303.f fails (r255499)
Date: Mon, 11 Dec 2017 15:45:00 -0000
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--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> Possibly a similar reason as x86, vect_cond_mixed is set but you cannot do
> V2DIV2DF mixed condition handling?
That appears to be the case:
proc check_effective_target_vect_cond_mixed { } {
global et_vect_cond_mixed_saved
global et_index
if [info exists et_vect_cond_mixed_saved($et_index)] {
verbose "check_effective_target_vect_cond_mixed: using cached result" 2
} else {
set et_vect_cond_mixed_saved($et_index) 0
if { [istarget i?86-*-*] || [istarget x86_64-*-*]
|| [istarget aarch64*-*-*]
|| [istarget powerpc*-*-*]
|| ([istarget mips*-*-*]
&& [et-is-effective-target mips_msa])
|| ([istarget s390*-*-*]
&& [check_effective_target_s390_vx]) } {
set et_vect_cond_mixed_saved($et_index) 1
}
}
but so far as I can tell the PPC back end does not have any vcond<m1><m2>
patterns where m1 != m2.
So is the target-supports check a total lie, so that we should remove the
powerpc*-*-* clause there? That's what the documentation would seem to imply.
>From gcc-bugs-return-584847-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:47:27 2017
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83298] [8 Regression] wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
Date: Mon, 11 Dec 2017 15:47:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |zsojka at seznam dot cz
--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
*** Bug 83362 has been marked as a duplicate of this bug. ***
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/83362] [8 Regression] wrong code at -O1
Date: Mon, 11 Dec 2017 15:47:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
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--- Comment #3 from Jeffrey A. Law <law at redhat dot com> ---
Confirmed as a duplicate.
*** This bug has been marked as a duplicate of bug 83298 ***
>From gcc-bugs-return-584848-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:49:40 2017
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From: "weilercdale at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/83367] static global constructors stack memory corruption
Date: Mon, 11 Dec 2017 15:49:00 -0000
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--- Comment #3 from Dale Weiler <weilercdale at gmail dot com> ---
(In reply to Richard Biener from comment #2)
> Try -fno-lifetime-dse?
Tried that, same issue.
>From gcc-bugs-return-584849-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:50:48 2017
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From: "hstong at ca dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83371] New: Partial ordering ignores implicit object parameter
Date: Mon, 11 Dec 2017 15:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83371
Bug ID: 83371
Summary: Partial ordering ignores implicit object parameter
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: accepts-invalid, rejects-valid, wrong-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hstong at ca dot ibm.com
Target Milestone: ---
For the following case, given that the constrained and unconstrained parameters
are similar in their constrainedness between the two candidates (just with
different ordering), and the arguments provided match just as well, it seems
that GCC is ignoring the implicit object parameter in the partial ordering in
turn leading to broken behaviour.
### SOURCE (<stdin>):
struct A {
template <typename T> void operator<(T &) &; // #1
};
template <typename T> bool operator<(T &, A &); // #2
bool g(A *ap) { return *ap < *ap; } // GCC picks #2;
// Clang and MSVC says ambiguous
### COMPILER INVOCATION:
g++ -S -o /dev/null -x c++ -
### ACTUAL OUTPUT:
(Clean compile)
### EXPECTED OUTPUT:
(Error message)
### COMPILER VERSION INFO (g++ -v):
Using built-in specs.
COLLECT_GCC=/opt/wandbox/gcc-head/bin/g++
COLLECT_LTO_WRAPPER=/opt/wandbox/gcc-head/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../source/configure --prefix=/opt/wandbox/gcc-head
--enable-languages=c,c++ --disable-multilib --without-ppl --without-cloog-ppl
--enable-checking=release --disable-nls --enable-lto
LDFLAGS=-Wl,-rpath,/opt/wandbox/gcc-head/lib,-rpath,/opt/wandbox/gcc-head/lib64,-rpath,/opt/wandbox/gcc-head/lib32
Thread model: posix
gcc version 8.0.0 20171210 (experimental) (GCC)
>From gcc-bugs-return-584850-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:51:30 2017
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libquadmath/83341] [8 Regression] r254899 causes about 15000 test failures on powerpc
Date: Mon, 11 Dec 2017 15:51:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
So, this was caused by having a libquadmath.so.0 in the --prefix (before
running "make install"), and apparently the testsuite does not like that.
Closing as invalid.
>From gcc-bugs-return-584851-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:52:36 2017
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Subject: [Bug testsuite/83332] [8 regression] new test case gfortran.dg/vect/pr81303.f fails (r255499)
Date: Mon, 11 Dec 2017 15:52:00 -0000
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--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Uh, actually that is not quite right. We do have vcondv4sfv4si and
vcondv4siv4sf patterns. So it looks like we need to adjust the test case until
such time as we add the v2di/v2df ones.
>From gcc-bugs-return-584852-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:57:33 2017
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Subject: [Bug rtl-optimization/14770] redundant store due to the fact that implicit set is not noticed
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Jeffrey A. Law <law at redhat dot com> changed:
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----------------------------------------------------------------------------
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CC| |law at redhat dot com
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--- Comment #5 from Jeffrey A. Law <law at redhat dot com> ---
RTL forwprop handles this. I didn't dig into precise when it was fixed.
>From gcc-bugs-return-584853-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 15:59:20 2017
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Subject: [Bug go/83308] Missing platform definitions for SH in libgo
Date: Mon, 11 Dec 2017 15:59:00 -0000
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--- Comment #11 from Ian Lance Taylor <ian at airs dot com> ---
As far as I know libbacktrace and libgo use the same criteria for whether they
are built or not. Why is libbacktrace not being built for m4-fpu? What is
preventing that build from occurring?
What is the value of TIOCGWINSZ on SH? What is the output of
grep TIOCGWINSZ TARGET/libgo/sysinfo.go
?
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Subject: [Bug testsuite/83332] [8 regression] new test case gfortran.dg/vect/pr81303.f fails (r255499)
Date: Mon, 11 Dec 2017 16:00:00 -0000
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Looks like adding those patterns should be pretty trivial, I'll work on a patch
for that.
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Subject: [Bug go/83308] Missing platform definitions for SH in libgo
Date: Mon, 11 Dec 2017 16:03:00 -0000
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--- Comment #12 from James Clarke <jrtc27 at jrtc27 dot com> ---
> What is the value of TIOCGWINSZ on SH?
It's 0x80087468, which is the expansion of _IOR('t', 104, struct winsize) (sh4
uses the default encoding for _IOC; also for some reason the value is
hard-coded in the header)
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From: "alan at octopull dot co.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83372] New: Compiler segfaults
Date: Mon, 11 Dec 2017 16:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83372
Bug ID: 83372
Summary: Compiler segfaults
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: alan at octopull dot co.uk
Target Milestone: ---
Created attachment 42839
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42839&action=edit
build log including gcc dump
g++7.2.0 on Ubuntu Artful AMD64:
https://launchpadlibrarian.net/348583139/buildlog_ubuntu-artful-amd64.mir_0.29.0~rc7-g165e6e8886-0ubuntu17.10_BUILDING.txt.gz
(Alse seen with g++7.2.1 on Fedora 27 x86_64:
https://copr-be.cloud.fedoraproject.org/results/ngompa/mir-prerel-fedora/fedora-27-x86_64/00685833-mir/builder-live.log)
Various other compiler versions and architectures built successfully.
/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/server/frontend/wayland/wayland_connector.cpp:2275:1:
internal compiler error: Segmentation fault
}
^
Please submit a full bug report
Preprocessed source stored into /tmp/cczHUc1t.out file, please attach this to
your bugreport.
>From gcc-bugs-return-584857-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:08:30 2017
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From: "bugzilla@poradnik-webmastera.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/83373] New: False positive reported by -Wstringop-overflow
Date: Mon, 11 Dec 2017 16:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83373
Bug ID: 83373
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When code below is compiled, gcc incorrectly complains that memcpy will read
data after end of buffer in line marked with star. Looks that gcc does not take
into account that 'if' above protects against this.
Code was compiles using gcc (GCC) 8.0.0 20171210 (experimental).
[code]
#include <string.h>
char buf[100];
void get_data(char* ptr);
__attribute((nonnull(1, 2)))
inline char* my_strcpy(char* __restrict__ dst, const char* __restrict__ src,
size_t size)
{
size_t len = strlen(src);
if (len < size)
memcpy(dst, src, len + 1);
else
{
memcpy(dst, src, size - 1); //*
dst[size - 1] = '\0';
}
return dst;
}
void test()
{
char data[20];
get_data(data);
my_strcpy(buf, data, sizeof(buf));
}
[/code]
[out]
$ g++ -c -o test.o test.cc -O2 -Wall
In function ‘char* my_strcpy(char*, const char*, size_t)’,
inlined from ‘void test()’ at test.cc:25:14:
test.cc:15:15: warning: ‘void* memcpy(void*, const void*, size_t)’ reading 99
bytes from a region of size 20 [-Wstringop-overflow=]
memcpy(dst, src, size - 1); //*
~~~~~~^~~~~~~~~~~~~~~~~~~~
[/out]
>From gcc-bugs-return-584858-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:09:18 2017
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Subject: [Bug tree-optimization/80631] [6/7/8 Regression] Compiling with -O3 -mavx2 gives wrong code
Date: Mon, 11 Dec 2017 16:09:00 -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 #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 42840
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42840&action=edit
gcc8-pr80631.patch
Untested fix.
>From gcc-bugs-return-584859-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:13:38 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83372] Compiler segfaults
Date: Mon, 11 Dec 2017 16:13:00 -0000
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Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2017-12-11
CC| |trippels at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
The attached file is not usable.
Please attach the compressed preprocessed source.
>From gcc-bugs-return-584860-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:14:30 2017
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From: "ak at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/83355] autofdo g++.dg/bprob/g++-bprob-1.C FAILS with ICE
Date: Mon, 11 Dec 2017 16:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83355
--- Comment #2 from ak at gcc dot gnu.org ---
Author: ak
Date: Mon Dec 11 16:13:53 2017
New Revision: 255540
URL: https://gcc.gnu.org/viewcvs?rev=255540&root=gcc&view=rev
Log:
Fix stack overflow with autofdo (PR83355)
g++.dg/bprob* is failing currently with autofdo.
Running in gdb shows that there is a very deep recursion in get_index_by_decl
until it
overflows the stack.
gcc/:
2017-12-11 Andi Kleen <ak@linux.intel.com>
PR gcov-profile/83355
* auto-profile.c (string_table::get_index_by_decl): Don't
recurse when abstract origin points to itself.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/auto-profile.c
trunk/gcc/lto-streamer-in.c
>From gcc-bugs-return-584861-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:16:14 2017
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From: "andrey.y.guskov at intel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/83338] [8 Regression] SPEC CPU2017 510.parest_r ICE
Date: Mon, 11 Dec 2017 16:16:00 -0000
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--- Comment #11 from Andrey Guskov <andrey.y.guskov at intel dot com> ---
Understood. Going to report back tomorrow.
>From gcc-bugs-return-584862-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:16:44 2017
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83345] c++1z produces an infinite recursion (c++1y works fine).
Date: Mon, 11 Dec 2017 16:16:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think that's the expected behaviour in C++17. The return statement in the
conversion operator no longer constructs an object in C++17, it calls the
conversion operator again.
This will fix it:
operator ref_proxy_t( void )
{
return ref_proxy_t( static_cast<ICondition&>(*this) );
}
>From gcc-bugs-return-584863-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:20:58 2017
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From: "alex.mikhalevich at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/83374] New: Bad std::is_standard_layout with two base class subobjects of the same type
Date: Mon, 11 Dec 2017 16:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83374
Bug ID: 83374
Summary: Bad std::is_standard_layout with two base class
subobjects of the same type
Product: gcc
Version: 6.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: alex.mikhalevich at gmail dot com
Target Milestone: ---
Steps to reproduce:
1. Compile the following code with gcc 6.3.0 (maybe affects other versions, I
was not able to check):
#include <iostream>
#include <type_traits>
struct Q {};
struct S : Q {};
struct T : Q {};
struct NonPod : S, T {};
int main(int argc, char** argv) {
std::cout << (bool)std::is_pod<NonPod>::value << " ";
std::cout << (bool)std::is_standard_layout<NonPod>::value << std::endl;
return 0;
}
2. Run the result program.
Expected result:
0 0 (the NonPod structure is not a standard-layout class as described here:
http://en.cppreference.com/w/cpp/concept/StandardLayoutType).
Actual result:
1 1
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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/83363] [8 Regression] wrong code at -O2 -fno-forward-propagate
Date: Mon, 11 Dec 2017 16:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83363
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |jakub at gcc dot gnu.org,
| |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r255384.
>From gcc-bugs-return-584865-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:27:28 2017
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83364] [8 Regression] wrong code with -O -fno-forward-propagate -fno-tree-coalesce-vars -fno-tree-ter
Date: Mon, 11 Dec 2017 16:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83364
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |jakub at gcc dot gnu.org,
| |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Also started with r255384.
>From gcc-bugs-return-584866-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:30:36 2017
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/19790] equality not noticed when signedness differs.
Date: Mon, 11 Dec 2017 16:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19790
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |law at redhat dot com
Resolution|--- |FIXED
--- Comment #7 from Jeffrey A. Law <law at redhat dot com> ---
The original issue reported by Kazu has been fixed. We no longer have to
increment a temporary holding i - 1 to retrieve i for second statement in the
loop.
Given the age of this BZ, I didn't bisect it to figure out exactly when that
happened.
>From gcc-bugs-return-584867-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:30:41 2017
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Subject: [Bug middle-end/19721] [meta-bug] optimizations that CSE still catches
Date: Mon, 11 Dec 2017 16:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19721
Bug 19721 depends on bug 19790, which changed state.
Bug 19790 Summary: equality not noticed when signedness differs.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19790
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-584869-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:35:40 2017
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Subject: [Bug rtl-optimization/82398] [8 Regression] error: qsort comparator non-negative on sorted output: 2 in fill_vec_av_set at gcc/sel-sched.c:3725
Date: Mon, 11 Dec 2017 16:35:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Andrey, any progress on this?
>From gcc-bugs-return-584868-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:35:15 2017
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From: "alan at octopull dot co.uk" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83372] Compiler segfaults
Date: Mon, 11 Dec 2017 16:35:00 -0000
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--- Comment #2 from Alan Griffiths <alan at octopull dot co.uk> ---
Created attachment 42841
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42841&action=edit
Preprocessed source
So far, I've only seen the error on "builders" where I don't have access (i.e.
I've so far failed to reproduce "locally"). The attached preprocessed source
comes from adapting the compile command shown in the build log and running that
locally.
I'm told the error also appears on Fedora 27 32bit builds, but intermittently.
>From gcc-bugs-return-584870-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:36:36 2017
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83374] [DR1813] Bad std::is_standard_layout with two base class subobjects of the same type
Date: Mon, 11 Dec 2017 16:36:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
Component|libstdc++ |c++
Summary|Bad std::is_standard_layout |[DR1813] Bad
|with two base class |std::is_standard_layout
|subobjects of the same type |with two base class
| |subobjects of the same type
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
G++ doesn't implement DR 1813 yet, https://wg21.link/cwg1813
struct B { int i; }; // standard-layout class
struct C : B { }; // standard-layout class
struct D : C { }; // standard-layout class
struct E : D { char : 4; }; // not a standard-layout class
static_assert( __is_standard_layout(B), "" );
static_assert( __is_standard_layout(C), "" );
static_assert( __is_standard_layout(D), "" );
static_assert( ! __is_standard_layout(E), "" );
struct Q {};
struct S : Q { };
struct T : Q { };
struct U : S, T { }; // not a standard-layout class
static_assert( ! __is_standard_layout(U), "" );
int main() { }
G++ fails the last assertion (and Clang fails the last two).
>From gcc-bugs-return-584872-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:37:42 2017
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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/83373] False positive reported by -Wstringop-overflow
Date: Mon, 11 Dec 2017 16:37:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic,
| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
CC| |msebor at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=78450
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.
The warning is caused by a missed optimization opportunity in the strlen pass.
GCC doesn't recognize that the result of a strlen() call with an array argument
must be less than the size of the array and, as a result, doesn't eliminate the
else block in my_strcpy(). The warning then sees the memcpy(dst, src, 99) call
and complains.
Here's a small test case for the missing strlen optimization. This is the
subject of pr78450.
$ cat d.c && gcc -O2 -S -Wall -Wextra -Wpedantic
-fdump-tree-optimized=/dev/stdout d.c
void init (void*);
void f (void)
{
char a[20];
init (a);
if (__builtin_strlen (a) < 20) // must be true
return;
__builtin_abort (); // can be eliminated
}
;; Function f (f, funcdef_no=0, decl_uid=1894, cgraph_uid=0, symbol_order=0)
f ()
{
char a[20];
long unsigned int _1;
<bb 2> [local count: 1073741825]:
init (&a);
_1 = __builtin_strlen (&a);
if (_1 <= 19)
goto <bb 3>; [99.96%]
else
goto <bb 4>; [0.00%]
<bb 3> [local count: 1073312327]:
a ={v} {CLOBBER};
return;
<bb 4> [count: 0]:
__builtin_abort (); // not eliminated but could be
}
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Subject: [Bug middle-end/82407] [meta-bug] qsort_chk fallout tracking
Date: Mon, 11 Dec 2017 16:37:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Summary|[8 Regression][meta-bug] |[meta-bug] qsort_chk
|qsort_chk fallout tracking |fallout tracking
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The only remaining PR is tracked as [8 Regression] already, we don't need 2
regression PRs for the same issue.
>From gcc-bugs-return-584873-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:38:12 2017
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Subject: [Bug lto/83375] New: partitioner partitions static arrays with label references
Date: Mon, 11 Dec 2017 16:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83375
Bug ID: 83375
Summary: partitioner partitions static arrays with label
references
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: andi-gcc at firstfloor dot org
CC: marxin at gcc dot gnu.org
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Created attachment 42842
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42842&action=edit
test case
I thought there was already a bug for this, but can't find it right now.
When &&labels are put into static arrays the LTO partitioner can put the static
into a different partition, which causes an assembler error because the code
labels are local.
This breaks Linux kernel LTO builds.
See attached test case.
I think ipa-comdats should put the function and the static into the same
partition, but for some reason it doesn't work.
Attached test case shows the problem with -flto-partition=1to1 -flto -O2
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Subject: [Bug tree-optimization/78450] strlen(s) return value can be assumed to be less than the size of s
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-12-11
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed based on bug 83373.
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Subject: [Bug middle-end/19986] [meta-bug] fold missing optimizations (compared to RTL)
Date: Mon, 11 Dec 2017 16:39:00 -0000
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Bug 19986 depends on bug 25529, which changed state.
Bug 25529 Summary: (unsigned * 2)/2 is not changed into unsigned &0x7FFFFFFF
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25529
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Subject: [Bug middle-end/25529] (unsigned * 2)/2 is not changed into unsigned &0x7FFFFFFF
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Jeffrey A. Law <law at redhat dot com> changed:
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--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
Fixed. Presumably by Naveen's patch.
>From gcc-bugs-return-584877-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:40:59 2017
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Subject: [Bug lto/83375] partitioner partitions static arrays with label references
Date: Mon, 11 Dec 2017 16:40:00 -0000
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--- Comment #1 from Andi Kleen <andi-gcc at firstfloor dot org> ---
Actually -flto-partition=max
>From gcc-bugs-return-584878-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:43:31 2017
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From: "cgw at alum dot mit.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libfortran/35014] Libgfortran.a (downloaded) is not PIC compiled...
Date: Mon, 11 Dec 2017 16:43:00 -0000
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--- Comment #5 from cgw at alum dot mit.edu ---
Why not?
Our use case is building a Python module (an .so file loaded by Python) which
wraps some Fortran code.
We would like to reduce the external dependencies that this module has. There
have been some hard-to-track-down runtime errors resulting from libgcc.so
version mismatches and we would like to remove this source of errors.
We found that libgfortran.so itself depends on libgcc.so, but had hoped that by
using the options `-static-libgfortran -static-libgcc' we could eliminate the
runtime dependency on libgcc.so completely
>From gcc-bugs-return-584880-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:44:46 2017
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug plugins/82371] [6/7 Regression] Cross-compiling GCC fails when build platform has fread_unlocked but host platform doesn't
Date: Mon, 11 Dec 2017 16:44:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Summary|[6/7/8 Regression] |[6/7 Regression]
|Cross-compiling GCC fails |Cross-compiling GCC fails
|when build platform has |when build platform has
|fread_unlocked but host |fread_unlocked but host
|platform doesn't |platform doesn't
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I believe this has been fixed already on the trunk, see r255154, in particular
the:
2017-11-14 Boris Kolpackov <boris@codesynthesis.com>
* Makefile.in (gengtype-lex.c): Fix broken AIX workaround.
part.
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Subject: [Bug lto/83376] New: ICE in LTO streamer
Date: Mon, 11 Dec 2017 16:44:00 -0000
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Bug ID: 83376
Summary: ICE in LTO streamer
Product: gcc
Version: 8.0
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Priority: P3
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Don't have a small test case right now, but will bisect
When building Linux kernel LTO with gcc 8 I currently get an ICE. Doesn't
happen on 7 and I think it's also recent on 8.
In this case data_in->current_decl_data is NULL while reading a reference.
0xa58fe7 crash_signal
../../gcc/gcc/toplev.c:325
0x957a39 lto_file_decl_data_get_var_decl
../../gcc/gcc/lto-streamer.h:1210
0x957a39 lto_input_tree_ref(lto_input_block*, data_in*, function*, LTO_tags)
../../gcc/gcc/lto-streamer-in.c:366
0x957c1d lto_input_tree_1(lto_input_block*, data_in*, LTO_tags, unsigned int)
../../gcc/gcc/lto-streamer-in.c:1475
0x6bdc8c lto_read_decls
../../gcc/gcc/lto/lto.c:1791
0x6bdc8c lto_file_finalize
../../gcc/gcc/lto/lto.c:2055
0x6bdc8c lto_create_files_from_ids
../../gcc/gcc/lto/lto.c:2065
0x6bdc8c lto_file_read
../../gcc/gcc/lto/lto.c:2106
0x6bdc8c read_cgraph_and_symbols
../../gcc/gcc/lto/lto.c:2818
0x6bfdb1 lto_main()
../../gcc/gcc/lto/lto.c:3323
>From gcc-bugs-return-584881-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:46:46 2017
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83372] Compiler segfaults
Date: Mon, 11 Dec 2017 16:46:00 -0000
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Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Thanks. I cannot reproduce the issue.
>From gcc-bugs-return-584882-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:49:58 2017
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From: "matthew at wil dot cx" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83377] New: Missed optimization (x86): Bit operations should be converted to arithmetic
Date: Mon, 11 Dec 2017 16:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83377
Bug ID: 83377
Summary: Missed optimization (x86): Bit operations should be
converted to arithmetic
Product: gcc
Version: 7.2.1
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GCC fails to optimise
if (x & 2) y = (x &~ 2)
into
if (x & 2) y = (x - 2)
in cases where that would be advantageous.
Here's one example, which I'm sure will upset the C pedants, but is relatively
common in codebases which use typed pointers based on the lower bits.
int a(void *);
struct s { struct s *s; };
int b(void *x) {
void *p = x;
if ((unsigned long)x & 2)
p = ((struct s *)((unsigned long)x & ~2UL))->s;
return a(p);
}
int c(void *x) {
void *p = x;
if ((unsigned long)x & 2)
p = ((struct s *)((unsigned long)x - 2))->s;
return a(p);
}
On x86, the difference between the assembly output is clear; function c is
smaller than function b:
0000000000000000 <b>:
0: 40 f6 c7 02 test $0x2,%dil
4: 74 07 je d <b+0xd>
6: 48 83 e7 fd and $0xfffffffffffffffd,%rdi
a: 48 8b 3f mov (%rdi),%rdi
d: e9 00 00 00 00 jmpq 12 <b+0x12>
12: 0f 1f 40 00 nopl 0x0(%rax)
16: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
1d: 00 00 00
0000000000000020 <c>:
20: 40 f6 c7 02 test $0x2,%dil
24: 74 04 je 2a <c+0xa>
26: 48 8b 7f fe mov -0x2(%rdi),%rdi
2a: e9 00 00 00 00 jmpq 2f <c+0xf>
This is true with both -O3 and -O2. I have other functions where the savings
are greater (two insns and seven bytes), but the root cause is the same; a
failure to optimise an AND into a SUB (which can then be fused with a load)
I'm filing this one under tree-optimisation rather than RTL, because I think
it's a common feature in CPUs to have load (reg + offset), and relatively
uncommon (in fact I don't know of one) to have load (reg & mask). I'm sure
some CPUs don't even have (reg + offset) addressing modes, but they wouldn't be
harmed by such an optimisation.
>From gcc-bugs-return-584883-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:52:28 2017
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Subject: [Bug c/83369] Missing diagnostics during inlining
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2017-12/msg00629.html
>From gcc-bugs-return-584884-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:57:44 2017
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From: "andrey.y.guskov at intel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/83338] [8 Regression] SPEC CPU2017 510.parest_r ICE
Date: Mon, 11 Dec 2017 16:57:00 -0000
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--- Comment #12 from Andrey Guskov <andrey.y.guskov at intel dot com> ---
Well, that was faster than I expected.
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=20171211/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: source/configure --prefix=20171211 --with-system-zlib
--with-demangler-in-ld --with-fpmath=sse --with-pkgversion=Revision=250112
--enable-shared --enable-host-shared --enable-clocale=gnu
--enable-cloog-backend=isl --enable-languages=c,c++,fortran,jit,lto
--with-arch=haswell --with-cpu=haswell
Thread model: posix
gcc version 8.0.0 20171211 (experimental) (Revision=250112)
510 - passed
436 - passed
447 - passed
>From gcc-bugs-return-584885-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 16:59:59 2017
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Subject: [Bug lto/83338] [8 Regression] SPEC CPU2017 510.parest_r ICE
Date: Mon, 11 Dec 2017 16:59:00 -0000
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--- Comment #13 from Andrey Guskov <andrey.y.guskov at intel dot com> ---
The revision was wrong, it`s today`s build.
>From gcc-bugs-return-584886-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:06:58 2017
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Subject: [Bug debug/83378] New: [8 regression] gcc.dg/guality/pr54970.c xpass
Date: Mon, 11 Dec 2017 17:06:00 -0000
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Bug ID: 83378
Summary: [8 regression] gcc.dg/guality/pr54970.c xpass
Product: gcc
Version: 8.0
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r255510 triggers this:
spawn gdb -nx -nw -quiet -batch -x pr54970.gdb ./pr54970.exe
XPASS: gcc.dg/guality/pr54970.c -O0 line 31 a[0] == 4
Option set:
-with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-shared
--enable-host-shared --enable-clocale=gnu --enable-cloog-backend=isl
--enable-languages=c,c++,fortran,jit,lto -with-arch=haswell --with-cpu=haswell
>From gcc-bugs-return-584887-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:08:59 2017
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Subject: [Bug target/29775] redundant movzbl
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Jeffrey A. Law <law at redhat dot com> changed:
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----------------------------------------------------------------------------
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CC| |law at redhat dot com
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--- Comment #3 from Jeffrey A. Law <law at redhat dot com> ---
No redundant extension on the trunk. Given the age of this BZ I did not try to
track it down to a particular change.
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Subject: [Bug tree-optimization/31914] FRE does not do const or copy propagation while it could
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Bug 31914 depends on bug 30997, which changed state.
Bug 30997 Summary: FRE does not simplify comparisons in COND_EXPRs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30997
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/30997] FRE does not simplify comparisons in COND_EXPRs
Date: Mon, 11 Dec 2017 17:14:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |law at redhat dot com
Resolution|--- |FIXED
--- Comment #5 from Jeffrey A. Law <law at redhat dot com> ---
Fixed. We generate a single comparison rather than two.
Not sure when. Given the age, I didn't try to bisect.
>From gcc-bugs-return-584890-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:18:45 2017
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Subject: [Bug middle-end/33349] Redundant zero-extension of registers
Date: Mon, 11 Dec 2017 17:18:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
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--- Comment #3 from Jeffrey A. Law <law at redhat dot com> ---
Fixed on the trunk. Not sure when and given the age of the BZ I didn't bisect
to find out.
>From gcc-bugs-return-584892-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:32:51 2017
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Subject: [Bug fortran/83379] New: Intermittent failure of min/maxval_char*.f90 test cases
Date: Mon, 11 Dec 2017 17:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83379
Bug ID: 83379
Summary: Intermittent failure of min/maxval_char*.f90 test
cases
Product: gcc
Version: unknown
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The test cases in question sometimes fail, see
https://gcc.gnu.org/ml/fortran/2017-12/msg00050.html and
https://gcc.gnu.org/ml/fortran/2017-12/msg00019.html
>From gcc-bugs-return-584891-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:32:05 2017
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Subject: [Bug target/44474] GCC inserts redundant "test" instruction due to incorrect clobber
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Jeffrey A. Law <law at redhat dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
Compare-elimination does the right thing and eliminates the redundant test on
the trunk. Given the age of the BZ I didn't track it down any further than
that.
>From gcc-bugs-return-584893-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:33:23 2017
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Subject: [Bug fortran/83379] [8 Regression] Intermittent failure of min/maxval_char*.f90 test cases
Date: Mon, 11 Dec 2017 17:33:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2017-12-11
Assignee|unassigned at gcc dot gnu.org |tkoenig at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|Intermittent failure of |[8 Regression] Intermittent
|min/maxval_char*.f90 test |failure of
|cases |min/maxval_char*.f90 test
| |cases
Ever confirmed|0 |1
>From gcc-bugs-return-584894-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:39:46 2017
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Subject: [Bug fortran/45689] [F03] Missing transformational intrinsic in the trans_func_f2003 list
Date: Mon, 11 Dec 2017 17:39:00 -0000
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--- Comment #14 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Mon Dec 11 17:39:07 2017
New Revision: 255542
URL: https://gcc.gnu.org/viewcvs?rev=255542&root=gcc&view=rev
Log:
2017-12-11 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/45689
* simplify.c (min_max_choose): Add prototype.
(gfc_count): Format correctly.
(simplify_transformation): Pass array argument to init_result_expr.
(gfc_simplify_minval_maxval): Remove.
(gfc_min): New function.
(gfc_simplify_minval): Call simplify_transformation.
(gfc_max): New function.
(gfc_simplify_maxval): Call simplify_transformation.
2017-12-11 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/45689
* gfortran.dg/minval_parameter_1.f90: New test.
* gfortran.dg/maxval_parameter_1.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/maxval_parameter_1.f90
trunk/gcc/testsuite/gfortran.dg/minval_parameter_1.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/simplify.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-584895-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:40:55 2017
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Subject: [Bug ada/82844] [8 Regression] Many ada tests time out on x32
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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>From gcc-bugs-return-584896-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:41:28 2017
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Subject: [Bug target/53110] GCC-4.7 generates stupid x86_64 asm
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |law at redhat dot com
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--- Comment #14 from Jeffrey A. Law <law at redhat dot com> ---
The trunk no longer generates masking with andl for this testcase. I didn't
try to track it down any further than that.
>From gcc-bugs-return-584897-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:43:57 2017
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Subject: [Bug middle-end/53347] Duplicated redundant condition in compare-elim.c
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Jeffrey A. Law <law at redhat dot com> changed:
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CC| |law at redhat dot com
Resolution|--- |FIXED
--- Comment #2 from Jeffrey A. Law <law at redhat dot com> ---
Eric fixed this as part of the compare-elim revamp last year.
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Subject: [Bug rtl-optimization/82849] [8 Regression] ICE on valid code since r254379
Date: Mon, 11 Dec 2017 17:44:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Honza, what happened to this patch? My understanding is that Jeff approved it,
but it hasn't been committed.
>From gcc-bugs-return-584899-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 17:46:41 2017
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From: "pawel_sikora at zoho dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83345] c++1z produces an infinite recursion (c++1y works fine).
Date: Mon, 11 Dec 2017 17:46:00 -0000
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--- Comment #2 from Pawel Sikora <pawel_sikora at zoho dot com> ---
(In reply to Jonathan Wakely from comment #1)
> I think that's the expected behaviour in C++17. The return statement in the
> conversion operator no longer constructs an object in C++17, it calls the
> conversion operator again.
>
> This will fix it:
>
> operator ref_proxy_t( void )
> {
> return ref_proxy_t( static_cast<ICondition&>(*this) );
> }
thanks for clarification. is there any list of such breaking changes for c++17?
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Subject: [Bug c++/83372] Compiler segfaults
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Alan Griffiths <alan at octopull dot co.uk> changed:
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----------------------------------------------------------------------------
Attachment #42841|0 |1
is obsolete| |
--- Comment #4 from Alan Griffiths <alan at octopull dot co.uk> ---
Created attachment 42843
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42843&action=edit
Preprocessed source as dumped by a failing build
I finally found a way to reproduce (using mock). Updated source from that.
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Subject: [Bug fortran/83379] [8 Regression] Intermittent failure of min/maxval_char*.f90 test cases
Date: Mon, 11 Dec 2017 17:58:00 -0000
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--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Mon Dec 11 17:57:38 2017
New Revision: 255543
URL: https://gcc.gnu.org/viewcvs?rev=255543&root=gcc&view=rev
Log:
2017-12-11 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/83379
* gfortran.dg/minval_char_1.f90: Correct logic for mask
calculation.
* gfortran.dg/minval_char_2.f90: Likewise.
* gfortran.dg/maxval_char_1.f90: Likewise.
* gfortran.dg/maxval_char_2.f90: Likewise.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/maxval_char_1.f90
trunk/gcc/testsuite/gfortran.dg/maxval_char_2.f90
trunk/gcc/testsuite/gfortran.dg/minval_char_1.f90
trunk/gcc/testsuite/gfortran.dg/minval_char_2.f90
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Subject: [Bug fortran/83379] [8 Regression] Intermittent failure of min/maxval_char*.f90 test cases
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 83366 has been marked as a duplicate of this bug. ***
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Subject: [Bug fortran/83366] gfortran.dg/minval_char_2.f90 and gfortran.dg/maxval_char_2.f90 fail at random
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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> ---
WORKSFORME on x86_64-apple-darwin17.
*** This bug has been marked as a duplicate of bug 83379 ***
>From gcc-bugs-return-584904-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 18:02:01 2017
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Subject: [Bug tree-optimization/66726] missed optimization, factor conversion out of COND_EXPR
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Jeffrey A. Law <law at redhat dot com> changed:
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--- Comment #20 from Jeffrey A. Law <law at redhat dot com> ---
Fixed by Kugan's work.
>From gcc-bugs-return-584905-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 18:08:42 2017
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Subject: [Bug target/67751] redundant zero extension
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Jeffrey A. Law <law at redhat dot com> changed:
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--- Comment #1 from Jeffrey A. Law <law at redhat dot com> ---
The combiner now removes the redundant extension on the trunk.
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Subject: [Bug middle-end/83239] False positive from -Wstringop-overflow on simple std::vector code
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--- Comment #14 from Jeffrey A. Law <law at redhat dot com> ---
You *really* don't want to do this with a match.pd pattern. Recovering the
arith-with-overflow optimizations is virtually impossible in the general case.
All that really needs to be done here is generalize existing code that
currently handles overflow tests with +-1 to handle them more generically. In
fact doing so actually removes code since we had separate cases for +1 and -1
generating an overflow.
>From gcc-bugs-return-584907-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 18:55:32 2017
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Subject: [Bug target/81959] PowerPC __float128 optimization fails with integer PRE_INC addresses
Date: Mon, 11 Dec 2017 18:55:00 -0000
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--- Comment #3 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Mon Dec 11 18:54:55 2017
New Revision: 255545
URL: https://gcc.gnu.org/viewcvs?rev=255545&root=gcc&view=rev
Log:
[gcc]
2017-12-11 Michael Meissner <meissner@linux.vnet.ibm.com>
Back port from trunk
2017-12-01 Michael Meissner <meissner@linux.vnet.ibm.com>
PR target/81959
* config/rs6000/rs6000.c (rs6000_address_for_fpconvert): Check for
whether we can allocate pseudos before trying to fix an address.
* config/rs6000/rs6000.md (float_<mode>si2_hw): Make sure the
memory address is indexed or indirect.
(floatuns_<mode>si2_hw2): Likewise.
[gcct/testsuite]
2017-12-11 Michael Meissner <meissner@linux.vnet.ibm.com>
Back port from trunk
2017-12-01 Michael Meissner <meissner@linux.vnet.ibm.com>
PR target/81959
* gcc.target/powerpc/pr81959.c: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/pr81959.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/rs6000/rs6000.c
branches/gcc-7-branch/gcc/config/rs6000/rs6000.md
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/83379] [8 Regression] Intermittent failure of min/maxval_char*.f90 test cases
Date: Mon, 11 Dec 2017 18:59:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
CC| |law at redhat dot com
>From gcc-bugs-return-584909-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 19:04:51 2017
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From: "alan at octopull dot co.uk" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83372] Compiler segfaults
Date: Mon, 11 Dec 2017 19:04:00 -0000
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--- Comment #5 from Alan Griffiths <alan at octopull dot co.uk> ---
It isn't clear why, but the problem seems to be provoked by this function:
int mf::WaylandConnector::client_socket_fd() const
{
enum { server, client, size };
int socket_fd[size];
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, socket_fd))
{
BOOST_THROW_EXCEPTION((std::system_error{
errno,
std::system_category(),
"Could not create socket pair"}));
}
if (!wl_client_create(display.get(), socket_fd[server]))
{
BOOST_THROW_EXCEPTION((std::system_error{
errno,
std::system_category(),
"Failed to add server end of socketpair to Wayland display"}));
}
return socket_fd[client];
}
Reworking to have just one throw site avoids the segfault. (But I've not yet
found a simpler example exhibiting the problem.)
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Subject: [Bug c++/83372] Compiler segfaults
Date: Mon, 11 Dec 2017 19:13:00 -0000
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--- Comment #6 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Still cannot reproduce. Please post the full gcc invocation. Add -v to it and
please post the full output, too.
>From gcc-bugs-return-584911-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 19:45:43 2017
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Subject: [Bug tree-optimization/83312] [8 regression] bogus -Warray-bounds warning
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org
--- Comment #6 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
FWIW this seems to have some of the issues with inlining vs diagnostics as PR
tree-optimization/83336.
In particular, the diagnostics lacks the "%K" in its format string (I take "%K"
to be something of a "make this work please" anti-pattern; diagnostics
shouldn't need to supply it IMHO).
Hacking up default_tree_diagnostic_starter to inject a %K, and using my other
local fixes for PR tree-optimization/83336, I get this additional contextual
information:
In function ‘ptlrpcd_ctl_init.part.0’,
inlined from ‘ptlrpcd_ctl_init’,
inlined from ‘ptlrpcd_init’ at ../../src/pr83312.c:20:7,
ptlrpcd_ctl_init(&ptlrpcd_init_pd->pd_threads[j], j);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
inlined from ‘ptlrpcd_addref’ at ../../src/pr83312.c:26:5:
ptlrpcd_init(ptlrpcd_init_groupsize);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../src/pr83312.c:10:26: warning: array subscript -1 is below array bounds of
‘struct ptlrpcd_ctl[6]’ [-Warray-bounds]
__builtin_snprintf(pc->pc_name, sizeof(pc->pc_name), "ptlrpcd_rcv");
~~^~~~~~~~~
which looks sane (well, the contextual information does; the warning itself is
still bogus).
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Subject: [Bug c++/83372] Compiler segfaults
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--- Comment #7 from Alan Griffiths <alan at octopull dot co.uk> ---
cd
/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/x86_64-redhat-linux-gnu/src/server/frontend/wayland
&& /usr/bin/c++ -DLOG_NDEBUG=1 -DMESA_EGL_NO_X11_HEADERS
-DMIR_DRMMODEADDFB_HAS_CONST_SIGNATURE
-DMIR_LOG_COMPONENT_FALLBACK=\"mirserver\"
-DMIR_SERVER_EGL_OPENGL_API=EGL_OPENGL_ES_API
-DMIR_SERVER_EGL_OPENGL_BIT=EGL_OPENGL_ES2_BIT
-DMIR_SERVER_GLEXT_H="<GLES2/gl2ext.h>" -DMIR_SERVER_GL_H="<GLES2/gl2.h>"
-DMIR_SERVER_GRAPHICS_PLATFORM_VERSION=\"MIR_GRAPHICS_PLATFORM_0.27\"
-DMIR_SERVER_INPUT_PLATFORM_VERSION=\"MIR_INPUT_PLATFORM_0.27\"
-DMIR_SERVER_PLATFORM_PATH=\"/usr/lib64/mir/server-platform\"
-DMIR_VERSION=\"0.29.0\" -DMIR_VERSION_MAJOR=0 -DMIR_VERSION_MICRO=0
-DMIR_VERSION_MINOR=29 -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/core
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/common
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/cookie
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/include/common
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/x86_64-redhat-linux-gnu/src/capnproto
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/x86_64-redhat-linux-gnu/src/protobuf
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/platform
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/client
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/server
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/renderer
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/renderers/gl
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/renderers/sw
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/include/platform
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/include/client
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/include/server
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/include/cookie
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -O2 -g -pipe -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic -pthread -g
-std=c++14 -Werror -Wall -fno-strict-aliasing -pedantic -Wnon-virtual-dtor
-Wextra -fPIC -Wno-psabi -flto -ffat-lto-objects -o
CMakeFiles/mirfrontend-wayland.dir/wayland_connector.cpp.o -c
/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/server/frontend/wayland/wayland_connector.cpp
-v
Using built-in specs.
Reading specs from /usr/lib/rpm/redhat/redhat-hardened-cc1
COLLECT_GCC=/usr/bin/c++
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object --enable-linker-build-id
--with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin
--enable-initfini-array --with-isl --enable-libmpx
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686
--build=x86_64-redhat-linux
Thread model: posix
gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)
COLLECT_GCC_OPTIONS='-D' 'LOG_NDEBUG=1' '-D' 'MESA_EGL_NO_X11_HEADERS' '-D'
'MIR_DRMMODEADDFB_HAS_CONST_SIGNATURE' '-D'
'MIR_LOG_COMPONENT_FALLBACK="mirserver"' '-D'
'MIR_SERVER_EGL_OPENGL_API=EGL_OPENGL_ES_API' '-D'
'MIR_SERVER_EGL_OPENGL_BIT=EGL_OPENGL_ES2_BIT' '-D'
'MIR_SERVER_GLEXT_H=<GLES2/gl2ext.h>' '-D' 'MIR_SERVER_GL_H=<GLES2/gl2.h>' '-D'
'MIR_SERVER_GRAPHICS_PLATFORM_VERSION="MIR_GRAPHICS_PLATFORM_0.27"' '-D'
'MIR_SERVER_INPUT_PLATFORM_VERSION="MIR_INPUT_PLATFORM_0.27"' '-D'
'MIR_SERVER_PLATFORM_PATH="/usr/lib64/mir/server-platform"' '-D'
'MIR_VERSION="0.29.0"' '-D' 'MIR_VERSION_MAJOR=0' '-D' 'MIR_VERSION_MICRO=0'
'-D' 'MIR_VERSION_MINOR=29' '-D' '_FILE_OFFSET_BITS=64' '-D' '_GNU_SOURCE' '-I'
'/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/core'
'-I'
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GNU C++14 (GCC) version 7.2.1 20170915 (Red Hat 7.2.1-2) (x86_64-redhat-linux)
compiled by GNU C version 7.2.1 20170915 (Red Hat 7.2.1-2), GMP version
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/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/server/frontend/wayland/wayland_connector.cpp:2275:1:
internal compiler error: Segmentation fault
}
^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/ccpaNiAr.out file, please attach this to
your bugreport.
>From gcc-bugs-return-584914-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 20:06:50 2017
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Subject: [Bug c++/83372] Compiler segfaults
Date: Mon, 11 Dec 2017 20:06:00 -0000
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can't reproduce it either.
>From gcc-bugs-return-584913-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 20:06:21 2017
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83372] Compiler segfaults
Date: Mon, 11 Dec 2017 20:06:00 -0000
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--- Comment #8 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Thanks. However, I still cannot reproduce.
Perhaps someone who has access to Red Hat 7.2.1-2 has more luck.
>From gcc-bugs-return-584915-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 20:21:26 2017
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Subject: [Bug c++/83372] Compiler segfaults
Date: Mon, 11 Dec 2017 20:21:00 -0000
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--- Comment #10 from Alan Griffiths <alan at octopull dot co.uk> ---
It took me some time and effort to reproduce too. :(
Building in my normal development environments showed no problems. And I've yet
to reproduce on Ubuntu (although the builders we use fail building for 17.10).
The steps I took (on Fedora 27):
$ sudo dnf install mock
$ sudo usermod -a -G mock $USER
$ wget
https://copr-be.cloud.fedoraproject.org/results/ngompa/mir-prerel-fedora/fedora-27-x86_64/00685833-mir/mir-0.29~git20171208.1.5500595-0.fc27.1.src.rpm
$ mock -r fedora-27-x86_64 mir-0.29~git20171208.1.5500595-0.fc27.1.src.rpm
$ mock -r fedora-27-x86_64 --shell
# cd
/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/x86_64-redhat-linux-gnu/src/server/frontend/wayland
&& /usr/bin/c++ -DLOG_NDEBUG=1 -DMESA_EGL_NO_X11_HEADERS
-DMIR_DRMMODEADDFB_HAS_CONST_SIGNATURE
-DMIR_LOG_COMPONENT_FALLBACK=\"mirserver\"
-DMIR_SERVER_EGL_OPENGL_API=EGL_OPENGL_ES_API
-DMIR_SERVER_EGL_OPENGL_BIT=EGL_OPENGL_ES2_BIT
-DMIR_SERVER_GLEXT_H="<GLES2/gl2ext.h>" -DMIR_SERVER_GL_H="<GLES2/gl2.h>"
-DMIR_SERVER_GRAPHICS_PLATFORM_VERSION=\"MIR_GRAPHICS_PLATFORM_0.27\"
-DMIR_SERVER_INPUT_PLATFORM_VERSION=\"MIR_INPUT_PLATFORM_0.27\"
-DMIR_SERVER_PLATFORM_PATH=\"/usr/lib64/mir/server-platform\"
-DMIR_VERSION=\"0.29.0\" -DMIR_VERSION_MAJOR=0 -DMIR_VERSION_MICRO=0
-DMIR_VERSION_MINOR=29 -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/core
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/common
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/cookie
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/include/common
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/x86_64-redhat-linux-gnu/src/capnproto
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/x86_64-redhat-linux-gnu/src/protobuf
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/platform
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/client
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/server
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/renderer
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/renderers/gl
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/include/renderers/sw
-I/builddir/build/BUILD/mir-5500595810c28c150a3bd9edf19b392c2aeab932/src/include/platform
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83336] Issues with displaying inlining chain for middle-end warnings
Date: Mon, 11 Dec 2017 20:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83336
--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch: adding some automated test coverage for the existing code:
https://gcc.gnu.org/ml/gcc-patches/2017-12/msg00646.html
>From gcc-bugs-return-584917-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 11 20:58:46 2017
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Subject: Re: [PATCH] Fix Bug 83237 - Values returned by std::poisson_distribution are not distributed correctly
To: Paolo Carlini <paolo.carlini@oracle.com>, gcc-bugs@gcc.gnu.org, gcc-patches@gcc.gnu.org, libstdc++@gcc.gnu.org
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From: Michele Pezzutti <mpezz@tiscali.it>
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I apologize as I am unable to run the test suitein its full form.
Nevertheless, I locally tested the following patch for the test suite:
*26_numerics/random/poisson_distribution/operators/values.cc
   Add additional test to cover bin 'floor(mu) + 1'
by compiling locally values.cc and running it as main().
I had to increase N from default value N = 100000 to N = 4000000 to
trigger the fault.
I think that for smaller N, the deviation due to the bug is well within
the confidence
interval set in testDiscreteDist().
The test case below is successful with the proposed patch.
diff --git a/values.cc b/values.cc
index 0039b7d..e12e54f 100644
--- a/values.cc
+++ b/values.cc
@@ -42,6 +42,10 @@ void test01()
  std::poisson_distribution<> pd3(30.0);
  auto bpd3 = std::bind(pd3, eng);
  testDiscreteDist(bpd3, [](int n) { return poisson_pdf(n, 30.0); } );
+
+ std::poisson_distribution<> pd4(37.17);
+ auto bpd4 = std::bind(pd4, eng);
+ testDiscreteDist<100, 4000000>(bpd4, [](int n) { return
poisson_pdf(n, 37.17); } );
 }
On 12/11/2017 10:52 AM, Paolo Carlini wrote:
> Hi,
>
> On 10/12/2017 14:47, Michele Pezzutti wrote:
>> Hi.
>>
>> This patch intends to fix Bug 83237 - Values returned by
>> std::poisson_distribution are not distributed correctly.
>> See https://gcc.gnu.org/bugzilla/show_bug.cgi?idƒ237 for issue
>> description and tests.
> In any case, the fix should come with a testcase, which would also
> validate the analysis. For this discrete distribution should be pretty
> easy to add one, because all the infrastructure is already in place,
> essentially three lines added to
> 26_numerics/random/poisson_distribution/operators/values.cc.
>
> Paolo.
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