[Bug target/115176] rbit pattern should use bitreverse rtl now

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115176

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot 
gnu.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2024-05-21

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
that is from aarch64-simd.md:
```
(define_insn "aarch64_rbit<mode><vczle><vczbe>"
  [(set (match_operand:VB 0 "register_operand" "=w")
        (unspec:VB [(match_operand:VB 1 "register_operand" "w")]
                   UNSPEC_RBIT))]
  "TARGET_SIMD"
  "rbit\\t%0.<Vbtype>, %1.<Vbtype>"
  [(set_attr "type" "neon_rbit")]
)
```

>From aarch64.md:
```
(define_insn "@aarch64_rbit<mode>"
  [(set (match_operand:GPI 0 "register_operand" "=r")
        (unspec:GPI [(match_operand:GPI 1 "register_operand" "r")]
UNSPEC_RBIT))]
  ""
  "rbit\\t%<w>0, %<w>1"
  [(set_attr "type" "rbit")]
)
```