https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119530
Bug ID: 119530
Summary: wrong code at -O{s,2,3} with "-fno-tree-vrp
-fno-inline" 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: ---
It appears to be a recent regression and doesn't reproduce with 14.2 and
earlier.
Compiler Explorer: https://godbolt.org/z/x9r5819To
[612] % 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/15.0.1/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
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.1 20250329 (experimental) (GCC)
[613] %
[613] % gcctk -O3 small.c; ./a.out
[614] % gcctk -O3 -fno-tree-vrp -fno-inline small.c
[615] % ./a.out
Aborted
[616] % cat small.c
struct a {
int b;
};
int c;
char d;
static int e(long f) { return f < 0; }
static void g(unsigned f) { c = e(~f); }
int main() {
int h;
struct a i = {128};
h = d > i.b;
g(h);
if (h)
__builtin_abort();
if (c)
__builtin_abort();
return 0;
}
