[Bug target/99764] New: ICE in extract_insn, at recog.c:2770

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99764

            Bug ID: 99764
           Summary: ICE in extract_insn, at recog.c:2770
           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
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: arm-linux-gnueabi

The following fails:

$ cat bf16.c
void foo(__bf16 b) {}

$ arm-linux-gnueabi-gcc bf16.c -c -mcpu=cortex-m1.small-multiply
bf16.c: In function ‘foo’:
bf16.c:1:21: error: unrecognizable insn:
    1 | void foo(__bf16 b) {}
      |                     ^
(insn 3 2 4 2 (set (mem/c:BF (reg/f:SI 113) [1 b+0 S2 A16])
        (reg:BF 0 r0 [ b ])) "bf16.c":1:20 -1
     (nil))
during RTL pass: vregs
bf16.c:1:21: internal compiler error: in extract_insn, at recog.c:2770
0x5fea13 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/rtl-error.c:108
0x5fea2f _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/rtl-error.c:116
0x5fdea6 extract_insn(rtx_insn*)
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/recog.c:2770
0x89833f instantiate_virtual_regs_in_insn
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/function.c:1609
0x89833f instantiate_virtual_regs
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/function.c:1983
0x89833f execute
       
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-arm/build/gcc/function.c:2032
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