https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68909
Bug ID: 68909 Summary: ICE on valid code at -O3 on x86_64-linux-gnu in maybe_record_trace_start, at dwarf2cfi.c:2297 Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: chengniansun at gmail dot com Target Milestone: --- The following code causes an ICE when compiled with the current gcc trunk at -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes. $: 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/6.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix gcc version 6.0.0 20151214 (experimental) [trunk revision 231607] (GCC) $: $: gcc-trunk -m32 -O3 small.c small.c: In function ‘main’: small.c:18:1: internal compiler error: in maybe_record_trace_start, at dwarf2cfi.c:2284 } ^ 0x789cf6 maybe_record_trace_start ../../gcc-trunk/gcc/dwarf2cfi.c:2284 0x78c450 scan_trace ../../gcc-trunk/gcc/dwarf2cfi.c:2462 0x78cc8a create_cfi_notes ../../gcc-trunk/gcc/dwarf2cfi.c:2616 0x78cc8a execute_dwarf2_frame ../../gcc-trunk/gcc/dwarf2cfi.c:2974 0x78cc8a execute ../../gcc-trunk/gcc/dwarf2cfi.c:3454 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. $: gcc-trunk -m64 -O3 small.c small.c: In function ‘main’: small.c:18:1: internal compiler error: in maybe_record_trace_start, at dwarf2cfi.c:2284 } ^ 0x789cf6 maybe_record_trace_start ../../gcc-trunk/gcc/dwarf2cfi.c:2284 0x78c450 scan_trace ../../gcc-trunk/gcc/dwarf2cfi.c:2462 0x78cc8a create_cfi_notes ../../gcc-trunk/gcc/dwarf2cfi.c:2616 0x78cc8a execute_dwarf2_frame ../../gcc-trunk/gcc/dwarf2cfi.c:2974 0x78cc8a execute ../../gcc-trunk/gcc/dwarf2cfi.c:3454 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. $: $: cat small.c int printf(const char*, ...); int a, b, c; char d = 5; int **e; int main() { b = 6; for (; b; b--) { c = 0; for (; c <= 8; c++) { while (!d) if (*e) break; d = 1; } } printf("%d\n", a); return 0; } $: