https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110252
Bug ID: 110252 Summary: Wrong code at -O2/3/s on x86_64-linux-gnu Product: gcc Version: 14.0 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: --- This seems to be a recent regression. Compiler explorer: https://godbolt.org/z/TW97cdYxv $ cat a.c int printf(const char *, ...); int d, f; const char a = 239; short e, b, h = 2; long g; short *c = &e; int *i = &f; int(j)(int k, int l) { return k < 0 ? k : k >> l; } int main() { for (;;) { g = (char)d + a; b = h && j(g, 6); *c = b; *i = e; break; } printf("%d\n", f); } $ $ gcc-tk -O0 a.c && ./a.out 1 $ gcc-tk -O1 a.c && ./a.out 1 $ gcc-tk -O2 a.c && ./a.out -1 $ gcc-tk -O3 a.c && ./a.out -1 $ gcc-tk -Os a.c && ./a.out -1 $ $ gcc-tk -v Using built-in specs. COLLECT_GCC=gcc-tk COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-bf470895905e9152424076d1630a9d2c60de023b/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/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-bf470895905e9152424076d1630a9d2c60de023b Thread model: posix Supported LTO compression algorithms: zlib gcc version 14.0.0 20230612 (experimental) (GCC) $