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* [Bug c/107293] New: Wrong code at -Os on x86_64-linux-gnu
@ 2022-10-17 12:06 shaohua.li at inf dot ethz.ch
2022-10-17 12:11 ` [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9 marxin at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: shaohua.li at inf dot ethz.ch @ 2022-10-17 12:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107293
Bug ID: 107293
Summary: Wrong code at -Os on x86_64-linux-gnu
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: shaohua.li at inf dot ethz.ch
Target Milestone: ---
% gcc-tk -v
Using built-in specs.
COLLECT_GCC=gcc-tk
COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-acdb24166d13d87c374e578d2ad5d58249171930/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-multilib --disable-bootstrap
--enable-languages=c,c++
--prefix=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-acdb24166d13d87c374e578d2ad5d58249171930
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221017 (experimental) (GCC)
%
% gcc-tk -w -O0 a.c && ./a.out
1
% gcc-tk -w -Os a.c && ./a.out
0
% cat a.c
short a;
int b[1];
int c(int p) {
return (p < 0) ? 0 : 10 + ((p / 100 - 16) / 4);
}
void f(int n) {
while (1) {
int m = n;
while ((m ) )
m /= 2;
break;
}
}
void g() {
int h = a = 0;
for (; h + a <= 0; a++) {
if (b[c(a - 6)])
break;
f(a);
}
}
int main() {
g();
__builtin_printf("%d\n", a);
}
%
Compiler explorer: https://godbolt.org/z/e7sssT7cq
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9
2022-10-17 12:06 [Bug c/107293] New: Wrong code at -Os on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
@ 2022-10-17 12:11 ` marxin at gcc dot gnu.org
2022-10-17 12:47 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: marxin at gcc dot gnu.org @ 2022-10-17 12:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107293
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Wrong code at -Os on |Wrong code at -Os on
|x86_64-linux-gnu |x86_64-linux-gnu since
| |r13-2876-g2460f7cdef7ef9c9
Ever confirmed|0 |1
CC| |aldyh at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Component|c |tree-optimization
Target Milestone|--- |13.0
Status|UNCONFIRMED |NEW
Last reconfirmed| |2022-10-17
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r13-2876-g2460f7cdef7ef9c9.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9
2022-10-17 12:06 [Bug c/107293] New: Wrong code at -Os on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
2022-10-17 12:11 ` [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9 marxin at gcc dot gnu.org
@ 2022-10-17 12:47 ` rguenth at gcc dot gnu.org
2022-10-17 16:59 ` aldyh at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-10-17 12:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107293
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Priority|P3 |P1
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9
2022-10-17 12:06 [Bug c/107293] New: Wrong code at -Os on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
2022-10-17 12:11 ` [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9 marxin at gcc dot gnu.org
2022-10-17 12:47 ` rguenth at gcc dot gnu.org
@ 2022-10-17 16:59 ` aldyh at gcc dot gnu.org
2022-10-17 18:56 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: aldyh at gcc dot gnu.org @ 2022-10-17 16:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107293
--- Comment #2 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Created attachment 53717
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53717&action=edit
patch in testing
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9
2022-10-17 12:06 [Bug c/107293] New: Wrong code at -Os on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
` (2 preceding siblings ...)
2022-10-17 16:59 ` aldyh at gcc dot gnu.org
@ 2022-10-17 18:56 ` cvs-commit at gcc dot gnu.org
2022-10-17 18:57 ` aldyh at gcc dot gnu.org
2022-10-21 6:28 ` pinskia at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-10-17 18:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107293
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Aldy Hernandez <aldyh@gcc.gnu.org>:
https://gcc.gnu.org/g:c9b840db504d15db01f06fe1fec38282dbafee07
commit r13-3341-gc9b840db504d15db01f06fe1fec38282dbafee07
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Mon Oct 17 18:56:24 2022 +0200
Make sure exported range for SSA post-dominates the DEF in
set_global_ranges_from_unreachable_edges.
The problem here is that we're exporting a range for an SSA range that
happens on the other side of a __builtin_unreachable, but the SSA does
not post-dominate the definition point. This is causing ivcanon to
unroll things incorrectly.
This was a snafu when converting the code from evrp.
PR tree-optimization/107293
gcc/ChangeLog:
* tree-ssa-dom.cc
(dom_opt_dom_walker::set_global_ranges_from_unreachable_edges):
Check that condition post-dominates the definition point.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/pr107293.c: New test.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9
2022-10-17 12:06 [Bug c/107293] New: Wrong code at -Os on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
` (3 preceding siblings ...)
2022-10-17 18:56 ` cvs-commit at gcc dot gnu.org
@ 2022-10-17 18:57 ` aldyh at gcc dot gnu.org
2022-10-21 6:28 ` pinskia at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: aldyh at gcc dot gnu.org @ 2022-10-17 18:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107293
Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
fixed
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9
2022-10-17 12:06 [Bug c/107293] New: Wrong code at -Os on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
` (4 preceding siblings ...)
2022-10-17 18:57 ` aldyh at gcc dot gnu.org
@ 2022-10-21 6:28 ` pinskia at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-10-21 6:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107293
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |slyfox at gcc dot gnu.org
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 107196 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-10-21 6:28 UTC | newest]
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2022-10-17 12:06 [Bug c/107293] New: Wrong code at -Os on x86_64-linux-gnu shaohua.li at inf dot ethz.ch
2022-10-17 12:11 ` [Bug tree-optimization/107293] Wrong code at -Os on x86_64-linux-gnu since r13-2876-g2460f7cdef7ef9c9 marxin at gcc dot gnu.org
2022-10-17 12:47 ` rguenth at gcc dot gnu.org
2022-10-17 16:59 ` aldyh at gcc dot gnu.org
2022-10-17 18:56 ` cvs-commit at gcc dot gnu.org
2022-10-17 18:57 ` aldyh at gcc dot gnu.org
2022-10-21 6:28 ` pinskia at gcc dot gnu.org
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