https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101151
Bug ID: 101151 Summary: ICE at -O1 and above 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. [511] % 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/12.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib --with-system-zlib Thread model: posix Supported LTO compression algorithms: zlib gcc version 12.0.0 20210621 (experimental) [master revision edf0c3ffb59:30584177106:12bdd39755a25d237b7776153cbe03e171396fc5] (GCC) [512] % [512] % gcctk -O0 small.c; ./a.out [513] % [513] % gcctk -O1 small.c small.c: In function ‘main’: small.c:2:5: error: stmt with wrong VUSE 2 | int main() { | ^~~~ # VUSE <.MEM_8(D)> b.0_1 = b; expected .MEM_6 during GIMPLE pass: sink small.c:2:5: internal compiler error: verify_ssa failed 0x1038aeb verify_ssa(bool, bool) ../../gcc-trunk/gcc/tree-ssa.c:1214 0xcb0437 execute_function_todo ../../gcc-trunk/gcc/passes.c:2049 0xcb11e2 execute_todo ../../gcc-trunk/gcc/passes.c:2096 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. [514] % [514] % cat small.c int a, *b = &a, c, d; int main() { *b; if (a) { L1: a = 0; L2: if (d) { while (b) ; goto L1; } } if (c) goto L2; return 0; }