https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104700
Bug ID: 104700 Summary: ICE on valid code at -O2 and -O3 with -fno-tree-ccp -fno-tree-dce -fno-tree-vrp on x86_64-linux-gnu: in find_or_generate_expression, at tree-ssa-pre.cc:2795 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. [627] % 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/12.0.1/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 12.0.1 20220226 (experimental) [master r12-7395-gafeaaf4b352] (GCC) [628] % [628] % gcctk -O2 -fno-tree-ccp -fno-tree-dce -fno-tree-vrp small.c during GIMPLE pass: pre small.c: In function ‘main’: small.c:2:5: internal compiler error: in find_or_generate_expression, at tree-ssa-pre.cc:2795 2 | int main() { | ^~~~ 0x1005c10 find_or_generate_expression ../../gcc-trunk/gcc/tree-ssa-pre.cc:2795 0x1005132 create_expression_by_pieces ../../gcc-trunk/gcc/tree-ssa-pre.cc:2951 0x10095b1 insert_into_preds_of_block ../../gcc-trunk/gcc/tree-ssa-pre.cc:3159 0x100b134 do_pre_regular_insertion ../../gcc-trunk/gcc/tree-ssa-pre.cc:3416 0x100b134 insert ../../gcc-trunk/gcc/tree-ssa-pre.cc:3809 0x100b134 execute ../../gcc-trunk/gcc/tree-ssa-pre.cc:4433 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. [629] % [629] % cat small.c int a, b; int main() { int c = 2, d, e = 0; if (a) e = 2; int f, g = -(1L | (e && f && f & e)); if (g) L: g = c; c = 0; d = e * g; if (d) goto L; while (e) { int i = (a && b) * i; } return 0; }