[PATCH][GCC][AARCH64] Canonicalize aarch64 widening simd plus insns

[Richard Sandiford]

Looks good to me FWIW (not a maintainer), just a minor formatting thing:

Matthew Malcomson <matthew.malcomson@arm.com> writes:
> diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md
> index aac5fa146ed8dde4507a0eb4ad6a07ce78d2f0cd..67b29cbe2cad91e031ee23be656ec61a403f2cf9 100644
> --- a/gcc/config/aarch64/aarch64-simd.md
> +++ b/gcc/config/aarch64/aarch64-simd.md
> @@ -3302,38 +3302,78 @@
>    DONE;
>  })
>  
> -(define_insn "aarch64_<ANY_EXTEND:su><ADDSUB:optab>w<mode>"
> +(define_insn "aarch64_<ANY_EXTEND:su>subw<mode>"
>    [(set (match_operand:<VWIDE> 0 "register_operand" "=w")
> -        (ADDSUB:<VWIDE> (match_operand:<VWIDE> 1 "register_operand" "w")
> -			(ANY_EXTEND:<VWIDE>
> -			  (match_operand:VD_BHSI 2 "register_operand" "w"))))]
> +			(minus:<VWIDE>
> +			 (match_operand:<VWIDE> 1 "register_operand" "w")
> +			 (ANY_EXTEND:<VWIDE>
> +			   (match_operand:VD_BHSI 2 "register_operand" "w"))))]

The (minus should be under the "(match_operand":

(define_insn "aarch64_<ANY_EXTEND:su>subw<mode>"
  [(set (match_operand:<VWIDE> 0 "register_operand" "=w")
	(minus:<VWIDE> (match_operand:<VWIDE> 1 "register_operand" "w")
		       (ANY_EXTEND:<VWIDE>
			 (match_operand:VD_BHSI 2 "register_operand" "w"))))]

Same for the other patterns.

Thanks,
Richard