https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81747
Bug ID: 81747 Summary: [8 Regression] ICE in operator[], at vec.h:749 Product: gcc Version: 8.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: asolokha at gmx dot com Target Milestone: --- Target: powerpc-*-linux-gnu*, powerpcspe-*-linux-gnu* At least gcc-8.0.0-alpha20170730 and gcc-8.0.0-alpha20170806 snapshots ICE when compiling the following snippet w/ -O2 (-O3, -Ofast) -funroll-loops: int ij (int pu, int x5) { int u7 = 3; unsigned int fa; for (fa = 533090919; fa < 1; ++fa) { pu = 1; while (pu != 0) { ed: u7 %= 1; } } if (x5 < 1) { if (fa != 3062256262 && u7 != 0) goto ed; return x5; } } % powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20170806 -O2 -funroll-loops -c -w whfolj7o.c during RTL pass: cse2 whfolj7o.c: In function 'ij': whfolj7o.c:23:1: internal compiler error: in operator[], at vec.h:749 } ^ 0x135560c vec<edge_def*, va_gc, vl_embed>::operator[](unsigned int) /var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20170806/work/gcc-8-20170806/gcc/vec.h:749 0x135560c cse_find_path /var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20170806/work/gcc-8-20170806/gcc/cse.c:6333 0x135560c cse_main /var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20170806/work/gcc-8-20170806/gcc/cse.c:6729 0x13557a6 rest_of_handle_cse2 /var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20170806/work/gcc-8-20170806/gcc/cse.c:7632 0x13557a6 execute /var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20170806/work/gcc-8-20170806/gcc/cse.c:7685