https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84677
Bug ID: 84677 Summary: internal compiler error: in extract_constrain_insn, at recog.c:2205 Product: gcc Version: 8.0.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: inline-asm Assignee: unassigned at gcc dot gnu.org Reporter: vegard.nossum at gmail dot com Target Milestone: --- Input: void a() { double b; asm ("" : "+pz, y" (b)); } Output: $ xgcc -x c++ -S - <stdin>: In function 'void a()': <stdin>:4:1: error: unrecognizable insn: (insn 7 11 5 2 (parallel [ (set (reg:DF 0 ax [orig:87 b ] [87]) (asm_operands:DF ("") ("=pz, y") 0 [ (reg:DF 0 ax [orig:87 b ] [87]) ] [ (asm_input:DF ("0,0") <stdin>:3) ] [] <stdin>:3)) (clobber (reg:CCFP 18 fpsr)) (clobber (reg:CC 17 flags)) ]) "<stdin>":3 -1 (nil)) during RTL pass: reload <stdin>:4:1: internal compiler error: in extract_constrain_insn, at recog.c:2205 0x610903 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) /home/vegard/git/gcc/gcc/rtl-error.c:108 0x610991 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) /home/vegard/git/gcc/gcc/rtl-error.c:116 0x2d17a96 extract_constrain_insn(rtx_insn*) /home/vegard/git/gcc/gcc/recog.c:2205 0x282f53f check_rtl /home/vegard/git/gcc/gcc/lra.c:2155 0x282f53f lra(_IO_FILE*) /home/vegard/git/gcc/gcc/lra.c:2573 0x260b334 do_reload /home/vegard/git/gcc/gcc/ira.c:5465 0x260b334 execute /home/vegard/git/gcc/gcc/ira.c:5649 $ xgcc --version xgcc (GCC) 8.0.1 20180301 (experimental) Built from git c435a9e730c6e8f10da09d58b4fc9aaeb401b0d5 (r258097). 7.3.0 seems fine with this. Test case was minimised by C-Reduce.