https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78738
Bug ID: 78738 Summary: [7 Regression] ICE in extract_insn, at recog.c:2311 Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: doko at gcc dot gnu.org Target Milestone: --- seen with r243219 on i686-linux-gnu, either omitting the -std=c99 or -ffast-math works around it: $ cat fractal_cache.i double a; long double roundl(); void b() { int c = roundl(a); b(c); } $ gcc -c -O2 -std=c99 -ffast-math fractal_cache.i fractal_cache.i: In function 'b': fractal_cache.i:6:1: error: unrecognizable insn: } ^ (insn 10 9 11 2 (set (reg:DF 93) (plus:DF (reg:DF 92) (reg:DF 95))) "fractal_cache.i":4 -1 (nil)) fractal_cache.i:6:1: internal compiler error: in extract_insn, at recog.c:2311 0x85c48cf _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) ../../src/gcc/rtl-error.c:108 0x85c490c _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) ../../src/gcc/rtl-error.c:116 0x8596890 extract_insn(rtx_insn*) ../../src/gcc/recog.c:2311 0x83eb32d instantiate_virtual_regs_in_insn ../../src/gcc/function.c:1589 0x83eb32d instantiate_virtual_regs ../../src/gcc/function.c:1956 0x83eb32d execute ../../src/gcc/function.c:2005 Please submit a full bug report, with preprocessed source if appropriate.