[Bug target/101424] New: [12 Regression] ICE in extract_insn, at recog.c:2771 since r12-2085-gf65878178ab05180

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101424

            Bug ID: 101424
           Summary: [12 Regression] ICE in extract_insn, at recog.c:2771
                    since r12-2085-gf65878178ab05180
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: ubizjak at gmail dot com
  Target Milestone: ---
              Host: x86_64-linux-gnu

The following fails:

$ cat ice.i
typedef int v4df __attribute__((vector_size(32)));
int foo_v4df_b, foo_v4df_c;
v4df __attribute__foo_v4df() {
  v4df a;
  a[foo_v4df_c] = foo_v4df_b;
  return a;
}

$ gcc ice.i -Ofast -mf16c -c
ice.i: In function '__attribute__foo_v4df':
ice.i:7:1: error: unrecognizable insn:
    7 | }
      | ^
(insn 11 10 12 2 (set (reg:V8SI 94)
        (eq:V8SI (reg:V8SI 92)
            (reg:V8SI 93))) "ice.i":5:17 -1
     (nil))
during RTL pass: vregs
ice.i:7:1: internal compiler error: in extract_insn, at recog.c:2771
0x713642 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:108
0x713664 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:116
0x7117cf extract_insn(rtx_insn*)
        /home/marxin/Programming/gcc/gcc/recog.c:2771
0xb7e933 instantiate_virtual_regs_in_insn
        /home/marxin/Programming/gcc/gcc/function.c:1611
0xb7e933 instantiate_virtual_regs
        /home/marxin/Programming/gcc/gcc/function.c:1985
0xb7e933 execute
        /home/marxin/Programming/gcc/gcc/function.c:2034
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