[Bug target/127800] New: ICE when calling __builtin_aarch64_crc32b without the target attribute

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127800

            Bug ID: 127800
           Summary: ICE when calling __builtin_aarch64_crc32b without the
                    target attribute
           Product: gcc
           Version: 16.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antoyo at gcc dot gnu.org
  Target Milestone: ---

Created attachment 65794
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65794&action=edit
Reproducer for the bug

Hi.
Compile the reproducer with `gcc main.c -c` and you get:

main.c: In function ‘f’:
main.c:5:1: error: unrecognizable insn:
    5 | }
      | ^
(insn 9 8 12 2 (set (reg:SI 101 [ _3 ])
        (unspec:SI [
                (reg:SI 103)
                (reg:QI 104)
            ] UNSPEC_CRC32B)) "main.c":4:10 -1
     (nil))
during RTL pass: vregs
main.c:5:1: internal compiler error: in extract_insn, at recog.cc:2894
0x2055cef internal_error(char const*, ...)
        ../../../gcc/gcc/diagnostic-global-context.cc:788
0x7deecf fancy_abort(char const*, int, char const*)
        ../../../gcc/gcc/diagnostics/context.cc:1817
0x7dcd9f _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../../gcc/gcc/rtl-error.cc:108
0x7dcdd3 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../../gcc/gcc/rtl-error.cc:116
0xde6cc3 extract_insn(rtx_insn*)
        ../../../gcc/gcc/recog.cc:2894
0xad9ac7 instantiate_virtual_regs_in_insn
        ../../../gcc/gcc/function.cc:1611
0xad9ac7 instantiate_virtual_regs
        ../../../gcc/gcc/function.cc:1987
0xad9ac7 execute
        ../../../gcc/gcc/function.cc:2034

Adding `__attribute__ ((target ("+crc")))` make this compiles.
Thanks.