https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115226
Bug ID: 115226 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 14.1 and earlier. Compiler Explorer: https://godbolt.org/z/EK1hn9n4s [538] % 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 20240525 (experimental) (GCC) [539] % [539] % gcctk -O3 small.c small.c: In function ‘main’: small.c:3:5: error: stmt with wrong VUSE 3 | int main() { | ^~~~ # .MEM_4 = VDEF <.MEM_15> a = 0; expected .MEM_2 during GIMPLE pass: unswitch small.c:3:5: internal compiler error: verify_ssa failed 0x140b2be verify_ssa(bool, bool) ../../gcc-trunk/gcc/tree-ssa.cc:1203 0x102deb5 execute_function_todo ../../gcc-trunk/gcc/passes.cc:2096 0x102e71e execute_todo ../../gcc-trunk/gcc/passes.cc:2143 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. [540] % [540] % cat small.c extern void c(); int a, b; int main() { while (b) { int d, e = 0, *f = &a; *f = 1; e = 1 >> d ? : 1 << d; if (e) a = 0; c(); } return 0; }