https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110701
Bug ID: 110701 Summary: Wrong code at -O1/2/3/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 looks like a recent regression. gcc at -O1 and above produce the wrong code. Compiler explorer: https://godbolt.org/z/6Wczv9dK6 $ cat a.c int printf(const char *, ...); int a; long b; int *c = &a; short(d)(short e, short f) { return e * f; } int main() { *c = d(340, b >= 0) ^ 3; printf("%d\n", a); } $ $ gcc-tk -O0 a.c && ./a.out 343 $ gcc-tk -O1 a.c && ./a.out -65193 $ gcc-tk -O2 a.c && ./a.out -65193 $ gcc-tk -O3 a.c && ./a.out -65193 $ gcc-tk -Os a.c && ./a.out -65193 $ $ gcc-tk -v Using built-in specs. COLLECT_GCC=gcc-tk COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-322d17ae51ea0137167424e0018d7fa355948f9f/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-322d17ae51ea0137167424e0018d7fa355948f9f Thread model: posix Supported LTO compression algorithms: zlib gcc version 14.0.0 20230711 (experimental) (GCC) $