https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116795
Bug ID: 116795
Summary: ICE on valid code at -O3 on x86_64-linux-gnu:
verify_ssa failed
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 as it doesn't reproduce with 14.2 and
earlier.
Compiler Explorer: https://godbolt.org/z/z17zjxs7K
[520] % 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/15.0.0/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
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240921 (experimental) (GCC)
[521] %
[521] % gcctk -O3 small.c
small.c: In function ‘main’:
small.c:3:5: error: definition in block 10 does not dominate use in block 8
3 | int main() {
| ^~~~
for SSA_NAME: _5 in statement:
e_12 = .SAT_SUB (1, _5);
during GIMPLE pass: widening_mul
small.c:3:5: internal compiler error: verify_ssa failed
0x25b5ae5 internal_error(char const*, ...)
../../gcc-trunk/gcc/diagnostic-global-context.cc:517
0x144b18e verify_ssa(bool, bool)
../../gcc-trunk/gcc/tree-ssa.cc:1203
0x1074c05 execute_function_todo
../../gcc-trunk/gcc/passes.cc:2108
0x10754ae execute_todo
../../gcc-trunk/gcc/passes.cc:2155
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[522] %
[522] % cat small.c
volatile int a, b;
int c;
int main() {
unsigned e = 0;
for (; e < 2; e++) {
a && b;
if (c)
e = -(c ^ e);
}
return 0;
}
