https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69245
--- Comment #13 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> --- This is a similar case I reduced from the Ubuntu rebuild failures, hitting the "max" idiom recognition: --- #pragma GCC push_options #pragma GCC target("fpu=crypto-neon-fp-armv8") static void foo (void) { } #pragma GCC pop_options float max_idiom (float x, float y) { return x > y ? x : y; } --- Compile with -march=armv7-a -mfloat-abi=hard -mfpu=neon -O2 -ffast-math Presumably the same root cause. bug.c:12:1: error: unrecognizable insn: } ^ (insn 7 4 8 2 (set (reg:SF 113) (smax:SF (reg/v:SF 112 [ y ]) (reg/v:SF 111 [ x ]))) bug2.c:11 -1 (nil)) bug.c:12:1: internal compiler error: in extract_insn, at recog.c:2286 0xa411e9 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) .../gcc/rtl-error.c:108 0xa41208 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) .../gcc/rtl-error.c:116 0xa1404d extract_insn(rtx_insn*) .../gcc/recog.c:2286 0x82b664 instantiate_virtual_regs_in_insn .../gcc/function.c:1582 0x82b664 instantiate_virtual_regs .../gcc/function.c:1950 0x82b664 execute .../gcc/function.c:1999 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.