https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102087
Bug ID: 102087 Summary: ICE on valid code at -O3 on x86_64-linux-gnu: in determine_exit_conditions, at tree-ssa-loop-manip.c:1049 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: --- [540] % 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 20210826 (experimental) [master revision 352d5e85a70:96f76144c4d:5a6c626710ad2ac4baa2dba02fac0750177e3305] (GCC) [541] % [541] % gcctk -O2 small.c [542] % [542] % gcctk -O3 small.c during GIMPLE pass: unrolljam small.c: In function ‘main’: small.c:4:5: internal compiler error: in determine_exit_conditions, at tree-ssa-loop-manip.c:1049 4 | int main() { | ^~~~ 0xfe4bea determine_exit_conditions ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:1049 0xfe4bea tree_transform_and_unroll_loop(loop*, unsigned int, edge_def*, tree_niter_desc*, void (*)(loop*, void*), void*) ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:1253 0x19ed2eb tree_loop_unroll_and_jam ../../gcc-trunk/gcc/gimple-loop-jam.c:590 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. [543] % [543] % cat small.c volatile int a[1]; unsigned b; int c; int main() { int d; for (; b > 1; b++) for (c = 0; c < 2; c++) for (d = 0; d < 2; d++) a[0]; return 0; }