https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82669
Bug ID: 82669 Summary: ICE at -Os on valid code on x86_64-linux-gnu: in bitmap_check_index, at sbitmap.h:105 Product: gcc Version: 8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: helloqirun at gmail dot com Target Milestone: --- It happens at -Os and in 32-bit mode only. $ gcc-trunk -v Using built-in specs. COLLECT_GCC=gcc-trunk COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix gcc version 8.0.0 20171022 (experimental) [trunk revision 253982] (GCC) $ gcc-trunk -m32 -Os abc.c during RTL pass: reload abc.c: In function ‘fn1’: abc.c:16:1: internal compiler error: in bitmap_check_index, at sbitmap.h:105 } ^ 0xb4a77b bitmap_check_index ../../gcc/gcc/sbitmap.h:105 0xb4a77b bitmap_set_bit ../../gcc/gcc/sbitmap.h:132 0xb4a77b remove_some_program_points_and_update_live_ranges ../../gcc/gcc/lra-lives.c:1082 0xb4a77b compress_live_ranges ../../gcc/gcc/lra-lives.c:1209 0xb4a77b lra_create_live_ranges_1 ../../gcc/gcc/lra-lives.c:1357 0xb4a95f lra_create_live_ranges(bool, bool) ../../gcc/gcc/lra-lives.c:1369 0xb2d963 lra(_IO_FILE*) ../../gcc/gcc/lra.c:2428 0xae5781 do_reload ../../gcc/gcc/ira.c:5446 0xae5781 execute ../../gcc/gcc/ira.c:5630 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 abc.c int a, b; void fn1() { for (;;) { int i, j; for (; i < 4; b++) for (; j < 8; a++) ; { for (; b;) { a = 0; for (;;) ; } } } }