* [Bug bootstrap/100373] [12 Regression] Darwin, Compare-debug fail after r12-248-gb58dc0b803057
2021-05-01 12:47 [Bug bootstrap/100373] New: [12 Regression] Darwin, Compare-debug fail after r12-248-gb58dc0b803057 iains at gcc dot gnu.org
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From: iains at gcc dot gnu.org @ 2021-05-01 12:49 UTC (permalink / raw)
To: gcc-bugs
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Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |build
Target| |x86_64-darwin
Last reconfirmed| |2021-05-01
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
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From: iains at gcc dot gnu.org @ 2021-05-02 15:09 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> ---
this happens with mpfr-4.x sources and not with mpfr-3.1.6.
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To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |UNCONFIRMED
Ever confirmed|1 |0
CC| |rguenth at gcc dot gnu.org
Target Milestone|--- |12.0
Version|unknown |12.0
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To: gcc-bugs
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Doesn't reproduce on x86_64-linux with bootstrapping with in-tree mpfr 4.1.0
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--- Comment #3 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> Doesn't reproduce on x86_64-linux with bootstrapping with in-tree mpfr 4.1.0
it might well be some corner-case, but Darwin is PIC by default, so it might be
worth trying --with-pic ?
failing that, I'll have to figure out some way to debug it...
(the CPU was not, in the end relevant, it was more that on the older machines I
hadn't updated GMP & friends to newer versions.)
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To: gcc-bugs
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--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #3)
> (In reply to Richard Biener from comment #2)
> > Doesn't reproduce on x86_64-linux with bootstrapping with in-tree mpfr 4.1.0
>
> it might well be some corner-case, but Darwin is PIC by default, so it might
> be worth trying --with-pic ?
and -gstrict-dwarf, -gdwarf-2
(I do plan to bump the default to DWARF-4 for macOS 10.10+ during GCC12 but
it's tricky on the older systems without configury tests for suitable dsymutil
- those are written and mostly tested, but still in my Q)
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From: rguenther at suse dot de @ 2021-05-04 11:03 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 4 May 2021, iains at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100373
>
> --- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> ---
> (In reply to Iain Sandoe from comment #3)
> > (In reply to Richard Biener from comment #2)
> > > Doesn't reproduce on x86_64-linux with bootstrapping with in-tree mpfr 4.1.0
> >
> > it might well be some corner-case, but Darwin is PIC by default, so it might
> > be worth trying --with-pic ?
>
> and -gstrict-dwarf, -gdwarf-2
That shouldn't really matter. If you have preprocessed source of
a miscomparing object and you can reproduce with that and
-fcompare-debug + options that would be a good first step.
Then creduce the result and look where it differs in code generation.
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To: gcc-bugs
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--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
master @r12-438 doesn't fail compare debug (maybe some later change masks this)
I think this will reproduce on a stage 1..
reduced:
a;
_Thread_local b;
c() {
long d = b;
a = 0;
b = 0;
}
cc1 -fpreprocessed gmp_op.i -O2 -gtoggle -quiet -o a.s
cc1 -fpreprocessed gmp_op.i -O2 -quiet -o b.s
...
a.o.stripped:
(__TEXT,__text) section
_c:
0000000000000000 subq $0x8, %rsp
0000000000000004 leaq (%rip), %rdi
000000000000000b callq 0x10
0000000000000010 movl $0x0, -0x4(%rip)
000000000000001a movl $0x0, (%rax)
0000000000000020 addq $0x8, %rsp
0000000000000024 retq
b.o.stripped:
(__TEXT,__text) section
_c:
0000000000000000 subq $0x8, %rsp
0000000000000004 leaq (%rip), %rdi
000000000000000b movl $0x0, -0x4(%rip)
0000000000000015 callq 0x1a
000000000000001a movl $0x0, (%rax)
0000000000000020 addq $0x8, %rsp
0000000000000024 retq
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To: gcc-bugs
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--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> ---
of course, this could be exposing some prexisting problem (but i did check that
the previous revision did not show the problem). -fno-ipa-ra makes no
difference.
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From: rguenth at gcc dot gnu.org @ 2021-05-05 8:08 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2021-05-01 00:00:00 |2021-05-05
Status|UNCONFIRMED |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
The difference appears in the IPA emultls pass:
--- a/t.i.072i.emutls 2021-05-05 10:07:19.344748567 +0200
+++ b/t.i.072i.emutls 2021-05-05 10:07:09.104642849 +0200
@@ -5,8 +5,13 @@
int * _4;
<bb 2> [local count: 1073741824]:
- a = 0;
+ # DEBUG BEGIN_STMT
_4 = __builtin___emutls_get_address (&__emutls_v.b);
+ # DEBUG D#1 => *_4
+ # DEBUG d => (long int) D#1
+ # DEBUG BEGIN_STMT
+ a = 0;
+ # DEBUG BEGIN_STMT
*_4 = 0;
return;
I will have a closer look.
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To: gcc-bugs
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--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 50756
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50756&action=edit
patch
This patch survives the new testcase with a cc1 cross to darwin and it does
produce expected results when I mangle it in different ways to hopefully catch
all paths in the code.
Actual bootstrap & regtest on a emutls target appreciated.
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--- Comment #10 from Iain Sandoe <iains at gcc dot gnu.org> ---
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=1, address=0x0)
frame #0: 0x00000001016a4bb3 cc1`::gimple_code(g=0x0000000000000000) at
gimple.h:1782
1779 static inline enum gimple_code
1780 gimple_code (const gimple *g)
1781 {
-> 1782 return g->code;
1783 }
1784
1785
Target 0: (cc1) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=1, address=0x0)
* frame #0: 0x00000001016a4bb3 cc1`::gimple_code(g=0x0000000000000000) at
gimple.h:1782
frame #1: 0x00000001016a4f4f cc1`::is_gimple_debug(gs=0x0000000000000000)
at gimple.h:4773
frame #2: 0x00000001016a7111 cc1`::lower_emutls_1(ptr=0x00000001030d4358,
walk_subtrees=0x00007ffeefbff2d4, cb_data=0x00007ffeefbff370) at
tree-emutls.c:483
frame #3: 0x0000000101a76f53 cc1`walk_tree_1(tp=0x00000001030d4358,
func=(cc1`::lower_emutls_1(tree *, int *, void *) at tree-emutls.c:457),
data=0x00007ffeefbff370, pset=0x0000000000000000,
lh=0x0000000000000000)(tree_node**, int*, void*), void*, hash_set<tree_node*,
false, default_hash_traits<tree_node*> >*, tree_node* (*)(tree_node**, int*,
tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false,
default_hash_traits<tree_node*> >*)) at tree.c:10959
frame #4: 0x00000001016a75e3
cc1`::lower_emutls_phi_arg(phi=0x00000001030d4300, i=0, d=0x00007ffeefbff420)
at tree-emutls.c:601
frame #5: 0x00000001016a77e3
cc1`::lower_emutls_function_body(node=0x0000000103045770) at tree-emutls.c:668
frame #6: 0x00000001016a7ef4 cc1`::ipa_lower_emutls() at tree-emutls.c:806
frame #7: 0x00000001016a7fe7
cc1`pass_ipa_lower_emutls::execute(this=0x000000014530fa00,
(null)=0x0000000000000000) const at tree-emutls.c:846
frame #8: 0x00000001014192cd cc1`execute_one_pass(pass=0x000000014530fa00)
at passes.c:2567
frame #9: 0x000000010141a39b
cc1`execute_ipa_pass_list(pass=0x000000014530fa00) at passes.c:2996
frame #10: 0x0000000100cbb711 cc1`::ipa_passes() at cgraphunit.c:2154
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From: rguenth at gcc dot gnu.org @ 2021-05-05 11:58 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #50756|0 |1
is obsolete| |
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 50759
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50759&action=edit
updated patch
Fixed missing setting of wi.stmt in lower_emutls_phi_arg
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From: iains at gcc dot gnu.org @ 2021-05-05 23:44 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #12 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #11)
> Created attachment 50759 [details]
> updated patch
>
> Fixed missing setting of wi.stmt in lower_emutls_phi_arg
I regstrapped r12-248+ first patch (I added the wi-stmt by hand) c.f. r12-247
and (a) bootstrap succeeded for patched (b) the testsuite showed nothing
unexpected. This was on x86_64-darwin19, but I have no reason to expect any
significance to that version (or even arch).
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From: cvs-commit at gcc dot gnu.org @ 2021-05-06 8:08 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:b5254d6b75fe6be669396cd1261f1cba829cc451
commit r12-558-gb5254d6b75fe6be669396cd1261f1cba829cc451
Author: Richard Biener <rguenther@suse.de>
Date: Wed May 5 10:15:27 2021 +0200
ipa/100373 - fix emutls lowering compare-debug issue
emutls figured that tls uses in debug-insns need lowering but
that obviously has effects on code-generation as can be seen
in the following IL diff with the new testcase:
<bb 2> [local count: 1073741824]:
- a = 0;
+ # DEBUG BEGIN_STMT
_4 = __builtin___emutls_get_address (&__emutls_v.b);
+ # DEBUG D#1 => *_4
+ # DEBUG d => (long int) D#1
+ # DEBUG BEGIN_STMT
+ a = 0;
+ # DEBUG BEGIN_STMT
*_4 = 0;
return;
where it figured the debug use of b in the original
<bb 2> [local count: 1073741824]:
# DEBUG BEGIN_STMT
# DEBUG D#1 => b
# DEBUG d => (long int) D#1
# DEBUG BEGIN_STMT
a = 0;
needs lowering (it maybe does when we want to produce perfect
debug but that's just bad luck).
The following patch fixes this by avoiding to create a new
emutls address when visiting debug stmts and instead resets them.
Another option might be to simply not lower debug stmt uses
but I have no way to verify actual debug info for this.
2021-05-05 Richard Biener <rguenther@suse.de>
PR ipa/100373
* tree-emutls.c (gen_emutls_addr): Pass in whether we're
dealing with a debug use and only query existing addresses
if so.
(lower_emutls_1): Avoid splitting out addresses for debug
stmts, reset the debug stmt when we fail to find existing
lowered addresses.
(lower_emutls_phi_arg): Set wi.stmt.
* gcc.dg/pr100373.c: New testcase.
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From: rguenth at gcc dot gnu.org @ 2021-05-06 8:09 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed. Latent on branches of course, but lets wait for fallout at least.
^ permalink raw reply [flat|nested] 17+ messages in thread