[Bug tree-optimization/104280] New: wrong code at -O1 and above
zhendong.su at inf dot ethz.ch
gcc-bugzilla@gcc.gnu.org
Sat Jan 29 08:40:50 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104280
Bug ID: 104280
Summary: wrong code at -O1 and above
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zhendong.su at inf dot ethz.ch
Target Milestone: ---
It is a recent regression.
[548] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
--disable-werror --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.1 20220129 (experimental) [master r12-6930-gf6f2d6cfec1] (GCC)
[549] %
[549] % gcctk -O0 small.c; ./a.out
[550] %
[550] % gcctk -O1 small.c
[551] % ./a.out
Aborted
[552] %
[552] % cat small.c
int a(unsigned b, int c) { return b / c; }
int main() {
if (a(1, 2) != 0)
__builtin_abort();
return 0;
}
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