https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81620
Bug ID: 81620 Summary: ICE on valid code at -O3 in both 32-bit and 64-bit modes on x86_64-linux-gnu (small.c:3:5: internal compiler error: in is_inv_store_elimination_chain, at tree-predcom.c:1651) Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: chengniansun at gmail dot com Target Milestone: --- $ gcc-trunk -v Using built-in specs. COLLECT_GCC=gcc-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto --prefix=/usr/local/gcc-trunk --disable-bootstrap Thread model: posix gcc version 8.0.0 20170730 (experimental) [trunk revision 250721] (GCC) $ gcc-trunk -O3 small.c during GIMPLE pass: pcom small.c: In function ‘main’: small.c:3:5: internal compiler error: in is_inv_store_elimination_chain, at tree-predcom.c:1651 int main() { ^~~~ 0xd25e10 is_inv_store_elimination_chain ../../gcc-source-trunk/gcc/tree-predcom.c:1651 0xd25e10 prepare_initializers_chain_store_elim ../../gcc-source-trunk/gcc/tree-predcom.c:2786 0xd25e10 prepare_initializers_chain ../../gcc-source-trunk/gcc/tree-predcom.c:2846 0xd25e10 prepare_initializers ../../gcc-source-trunk/gcc/tree-predcom.c:2901 0xd25e10 tree_predictive_commoning_loop ../../gcc-source-trunk/gcc/tree-predcom.c:3092 0xd25e10 tree_predictive_commoning() ../../gcc-source-trunk/gcc/tree-predcom.c:3170 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. $ cat small.c int a[7]; char b; int main() { b = 4; for (; b; b--) { a[b] = b; a[b + 2] = 1; } return 0; } $