[Bug tree-optimization/107194] New: wrong code at -O1 on x86_64-linux-gnu
zhendong.su at inf dot ethz.ch
gcc-bugzilla@gcc.gnu.org
Sun Oct 9 12:54:18 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107194
Bug ID: 107194
Summary: wrong code at -O1 on x86_64-linux-gnu
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: ---
This works for 12.2, so should be a recent regression.
Compiler Explorer: https://godbolt.org/z/7vobTxhG4
[581] % 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/13.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221009 (experimental) [master r13-3180-ge95e91eccd0] (GCC)
[582] %
[582] % gcctk -O1 small.c
[583] % ./a.out
Aborted
[584] % cat small.c
int a, b;
int main() {
int c = 0;
long d;
for (; b < 1; b++) {
(c && d) & 3 || a;
d = c;
c = -1;
if (d)
__builtin_abort();
}
return 0;
}
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