[Bug target/101058] New: [12 Regression] ICE in extract_insn, at recog.c:2770 since r12-1215-g8d7dae0eb366a88a

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101058

            Bug ID: 101058
           Summary: [12 Regression] ICE in extract_insn, at recog.c:2770
                    since r12-1215-g8d7dae0eb366a88a
           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 vect.i
short add90Hybrid_a_1;
short *add90Hybrid_b, *add90Hybrid_c, *add90Hybrid_d;
void add90Hybrid() {
  for (int i; i < 200; i += 2) {
    add90Hybrid_c[i] = add90Hybrid_b[i];
    add90Hybrid_d[i] = add90Hybrid_a_1 - add90Hybrid_b[i + 1];
  }
}

$ gcc vect.i -c -m32 -O3 -mno-mmx -std=c99
vect.i: In function ‘add90Hybrid’:
vect.i:8:1: error: unrecognizable insn:
    8 | }
      | ^
(insn 474 473 213 13 (set (reg:V4HI 21 xmm1 [orig:321 vect__144.35 ] [321])
        (vec_select:V4HI (reg:V4HI 21 xmm1 [orig:321 vect__144.35 ] [321])
            (parallel [
                    (const_int 2 [0x2])
                    (const_int 3 [0x3])
                    (const_int 0 [0]) repeated x2
                ]))) "vect.i":5:37 -1
     (nil))
during RTL pass: split2
vect.i:8:1: internal compiler error: in extract_insn, at recog.c:2770
0x70345e _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:108
0x703480 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:116
0x7015eb extract_insn(rtx_insn*)
        /home/marxin/Programming/gcc/gcc/recog.c:2770
0xdf0094 extract_insn_cached(rtx_insn*)
        /home/marxin/Programming/gcc/gcc/recog.c:2659
0xb1b1dc cleanup_subreg_operands(rtx_insn*)
        /home/marxin/Programming/gcc/gcc/final.c:3099
0xdedeb7 split_insn
        /home/marxin/Programming/gcc/gcc/recog.c:3399
0xdf3387 split_all_insns()
        /home/marxin/Programming/gcc/gcc/recog.c:3467
0xdf342c execute
        /home/marxin/Programming/gcc/gcc/recog.c:4385
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