https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79649
--- Comment #12 from Uroš Bizjak <ubizjak at gmail dot com> --- The added testcase also ICEs with -O3 -mx32: ~/gcc-build/gcc/cc1 -O3 -mx32 -quiet pr79649.c pr79649.c: In function ‘f1’: pr79649.c:11:1: internal compiler error: in get_use_type, at tree-ssa-loop-ivopts.c:3831 f1 (unsigned char __seg_gs *s, size_t n) ^~ 0xff99a1 get_use_type ../../git/gcc/gcc/tree-ssa-loop-ivopts.c:3830 0xfff0c8 get_computation_at ../../git/gcc/gcc/tree-ssa-loop-ivopts.c:3847 0x1009aba get_computation_cost_at ../../git/gcc/gcc/tree-ssa-loop-ivopts.c:5061 0x1009c0f get_computation_cost ../../git/gcc/gcc/tree-ssa-loop-ivopts.c:5089 0x100a251 determine_group_iv_cost_address ../../git/gcc/gcc/tree-ssa-loop-ivopts.c:5133