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From: "shaohua.li at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/107176] New: Wrong code at -O0/-Os on x86_64-pc-linux-gnu
Date: Thu, 06 Oct 2022 20:41:25 +0000 [thread overview]
Message-ID: <bug-107176-4@http.gcc.gnu.org/bugzilla/> (raw)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107176
Bug ID: 107176
Summary: Wrong code at -O0/-Os on x86_64-pc-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-b48d7ff3570fa0ebe7790275cf020d8885120338/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-b48d7ff3570fa0ebe7790275cf020d8885120338
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20220928 (experimental) (GCC)
%
%gcc-tk -O0 a.c && ./a.out
1073741824
%
%gcc-tk -Os a.c && ./a.out
0
%
%cat a.c
int a;
long b;
long c(unsigned d) {
return d;
}
void e(d) {
a = d;
}
int main() {
b = 0;
for (; b < 1; b = c(b - 90) + 90 + 1)
;
e(b >> 2);
printf("%d\n", a);
}
%
Compiler explorer: https://godbolt.org/z/zzMdosoKj
next reply other threads:[~2022-10-06 20:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-06 20:41 shaohua.li at inf dot ethz.ch [this message]
2022-10-06 20:50 ` [Bug tree-optimization/107176] [10/11/12/13 Regression] Wrong code at -Os " pinskia at gcc dot gnu.org
2022-10-07 7:30 ` rguenth at gcc dot gnu.org
2022-10-07 14:36 ` [Bug tree-optimization/107176] [10/11/12/13 Regression] Wrong code at -Os on x86_64-pc-linux-gnu since r7-2012-g43aabfcfd4139e4c marxin at gcc dot gnu.org
2022-10-18 8:35 ` rguenth at gcc dot gnu.org
2022-10-21 13:25 ` rguenth at gcc dot gnu.org
2022-10-24 8:30 ` rguenth at gcc dot gnu.org
2022-10-24 9:54 ` rguenth at gcc dot gnu.org
2022-10-24 13:31 ` rguenth at gcc dot gnu.org
2022-10-25 11:40 ` cvs-commit at gcc dot gnu.org
2022-10-25 11:41 ` [Bug tree-optimization/107176] [10/11/12 " rguenth at gcc dot gnu.org
2022-11-28 10:18 ` rguenth at gcc dot gnu.org
2023-07-07 10:44 ` [Bug tree-optimization/107176] [11/12 " rguenth at gcc dot gnu.org
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