[Bug target/98833] New: [11 Regression] ICE in extract_insn, at recog.c:2769 since r11-6849-gee78c20e74d30284

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98833

            Bug ID: 98833
           Summary: [11 Regression] ICE in extract_insn, at recog.c:2769
                    since r11-6849-gee78c20e74d30284
           Product: gcc
           Version: 11.0
            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
  Target Milestone: ---
              Host: x86_64-linux
            Target: x86_64-linux-gnu

The following ICEs:

$ cat xop.c
int __attribute__((__vector_size__(4 * sizeof(int)))) * f5_p;

void f5() { *f5_p = 0 == *f5_p; }

$ gcc xop.c -mavx512vl -mxop -O -c
xop.c: In function ‘f5’:
xop.c:3:33: error: unrecognizable insn:
    3 | void f5() { *f5_p = 0 == *f5_p; }
      |                                 ^
(insn 14 15 11 2 (set (reg:V4SI 84 [ _4 ])
        (eq:V4SI (mem:V4SI (reg/f:DI 82 [ f5_p.0_1 ]) [2 *f5_p.0_1+0 S16 A128])
            (reg:V4SI 85))) "xop.c":3:23 -1
     (expr_list:REG_DEAD (reg:V4SI 85)
        (nil)))
during RTL pass: ira
xop.c:3:33: internal compiler error: in extract_insn, at recog.c:2769
0x6fe7bf _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:108
0x6fe7e1 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:116
0x6fc985 extract_insn(rtx_insn*)
        /home/marxin/Programming/gcc/gcc/recog.c:2769
0xc84915 ira_remove_insn_scratches(rtx_insn*, bool, _IO_FILE*, rtx_def*
(*)(rtx_def*))
        /home/marxin/Programming/gcc/gcc/ira.c:5243
0xc85b68 remove_scratches
        /home/marxin/Programming/gcc/gcc/ira.c:5287
0xc85b68 ira
        /home/marxin/Programming/gcc/gcc/ira.c:5602
0xc85b68 execute
        /home/marxin/Programming/gcc/gcc/ira.c:5964
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.