https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98086
Bug ID: 98086 Summary: [9/10/11 Regression] ICE in extract_insn, at recog.c:2315 Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: gs...@t-online.de Target Milestone: --- Started with r6 : $ cat z1.c struct S { int a, b, c, d; } x; void f () { asm ("" : "=@ccc"(x)); } $ gcc-5 -c z1.c z1.c: In function 'f': z1.c:6:3: error: inconsistent operand constraints in an 'asm' asm ("" : "=@ccc"(x)); ^ $ $ gcc-11-20201129 -c z1.c z1.c: In function 'f': z1.c:7:1: error: unrecognizable insn: 7 | } | ^ (insn 7 6 5 2 (set (reg:TI 82) (zero_extend:TI (reg:QI 83))) "z1.c":6:3 -1 (nil)) during RTL pass: vregs z1.c:7:1: internal compiler error: in extract_insn, at recog.c:2315 0x5f2645 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) ../../gcc/rtl-error.c:108 0x5f2664 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) ../../gcc/rtl-error.c:116 0xabf2b7 extract_insn(rtx_insn*) ../../gcc/recog.c:2315 0x89cc63 instantiate_virtual_regs_in_insn ../../gcc/function.c:1609 0x89cc63 instantiate_virtual_regs ../../gcc/function.c:1979 0x89cc63 execute ../../gcc/function.c:2028