[Bug target/103151] New: ICE in extract_insn, at recog.c:2769 since r12-3407-g9e2a82e1f9d2c4af

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103151

            Bug ID: 103151
           Summary: ICE in extract_insn, at recog.c:2769 since
                    r12-3407-g9e2a82e1f9d2c4af
           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: crazylht at gmail dot com, hjl at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu

The following fails:

$ cat fp16.c
#include <immintrin.h>
__m256h f11() {
  int i;
  __m256h z;
  z[i] = i;
  return z;
}

$ gcc fp16.c -c -O3 -mavx512fp16 -mxop -c
cat fp16.c: In function ‘f11’:
fp16.c:7:1: error: unrecognizable insn:
    7 | }
      | ^
(insn 11 10 12 2 (set (reg:V16HF 89)
        (if_then_else:V16HF (subreg:V16HF (reg:V16HI 94) 0)
            (reg:V16HF 90)
            (reg:V16HF 89))) "fp16.c":5:8 -1
     (nil))
during RTL pass: vregs
fp16.c:7:1: internal compiler error: in extract_insn, at recog.c:2769
0x755186 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:108
0x7551a8 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:116
0x753313 extract_insn(rtx_insn*)
        /home/marxin/Programming/gcc/gcc/recog.c:2769
0xbbe603 instantiate_virtual_regs_in_insn
        /home/marxin/Programming/gcc/gcc/function.c:1611
0xbbe603 instantiate_virtual_regs
        /home/marxin/Programming/gcc/gcc/function.c:1985
0xbbe603 execute
        /home/marxin/Programming/gcc/gcc/function.c:2034
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.