https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103517
Bug ID: 103517 Summary: ICE in as_a, at is-a.h:242 with -O2 -march=skylake-avx512 Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: vsevolod.livinskij at frtk dot ru Target Milestone: --- The same error exists for Sapphire Rapids Reproducer: int a; short b, c; extern short d[]; void e() { for (short f = 1; f < (short)a; f += 2) if (d[f + 1]) { b = d[f]; c = d[f + 1]; } } Error: >$ g++ -O2 -march=skylake-avx512 -c func.cpp during GIMPLE pass: vect func.cpp: In function 'void e()': func.cpp:4:6: internal compiler error: in as_a, at is-a.h:242 4 | void e() { | ^ 0x8bc06a gphi const* as_a<gphi const*, gimple const>(gimple const*) /testing/gcc/gcc_src_master/gcc/is-a.h:242 0x8bc684 gcall* as_a<gcall*, gimple>(gimple*) /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:991 0x8bc684 vect_build_slp_tree_1 /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:1155 0x14880cc vect_build_slp_tree_2 /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:1711 0x1487a0c vect_build_slp_tree /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:1544 0x1488884 vect_build_slp_tree_2 /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:2206 0x1487a0c vect_build_slp_tree /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:1544 0x148c230 vect_build_slp_instance /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:3019 0x148d6b5 vect_analyze_slp_instance /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:3339 0x14920d4 vect_analyze_slp(vec_info*, unsigned int) /testing/gcc/gcc_src_master/gcc/tree-vect-slp.c:3422 0x146d24a vect_analyze_loop_2 /testing/gcc/gcc_src_master/gcc/tree-vect-loop.c:2331 0x146eef9 vect_analyze_loop_1 /testing/gcc/gcc_src_master/gcc/tree-vect-loop.c:2830 0x146f40a vect_analyze_loop(loop*, vec_info_shared*) /testing/gcc/gcc_src_master/gcc/tree-vect-loop.c:2952 0x14a3359 try_vectorize_loop_1 /testing/gcc/gcc_src_master/gcc/tree-vectorizer.c:1047 0x14a3359 try_vectorize_loop /testing/gcc/gcc_src_master/gcc/tree-vectorizer.c:1162 0x14a3fb4 execute /testing/gcc/gcc_src_master/gcc/tree-vectorizer.c:1278 gcc version 12.0.0 20211130 (6b8ecbc6d6652d061d7c72c64352d51eca2df6ca) (GCC)