Re: [PATCH v2] RISC-V: Add vector_scalar_shift_operand

[Kito Cheng <kito.cheng@gmail.com>]

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LGTM, thanks :)

Palmer Dabbelt <palmer@rivosinc.com> 於 2023年5月12日 週五 06:32 寫道：

> The vector shift immediates happen to have the same constraints as some
> of the CSR-related operands, but it's a different usage.  This adds a
> name for them, so I don't get confused again next time.
>
> gcc/ChangeLog:
>
>         * config/riscv/autovec.md (shifts): Use
>           vector_scalar_shift_operand.
>         * config/riscv/predicates.md (vector_scalar_shift_operand): New
>           predicate.
> ---
> Still haven't built-tested it, my box is busy.
>
> Changes since v1 <20230511182555.26183-1-palmer@rivosinc.com>:
> * Change the name to "vector_scalar_shift_operand", as per Juzhe's
>   suggestion.
> * Add a missing second ";" in the comment.
> ---
>  gcc/config/riscv/autovec.md    | 2 +-
>  gcc/config/riscv/predicates.md | 5 +++++
>  2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/gcc/config/riscv/autovec.md b/gcc/config/riscv/autovec.md
> index ac0c939d277..4561fcbe957 100644
> --- a/gcc/config/riscv/autovec.md
> +++ b/gcc/config/riscv/autovec.md
> @@ -132,7 +132,7 @@ (define_expand "<optab><mode>3"
>    [(set (match_operand:VI 0 "register_operand")
>      (any_shift:VI
>       (match_operand:VI 1 "register_operand")
> -     (match_operand:<VEL> 2 "csr_operand")))]
> +     (match_operand:<VEL> 2 "vector_scalar_shift_operand")))]
>    "TARGET_VECTOR"
>  {
>    if (!CONST_SCALAR_INT_P (operands[2]))
> diff --git a/gcc/config/riscv/predicates.md
> b/gcc/config/riscv/predicates.md
> index e5adf06fa25..90e6f942c97 100644
> --- a/gcc/config/riscv/predicates.md
> +++ b/gcc/config/riscv/predicates.md
> @@ -43,6 +43,11 @@ (define_predicate "csr_operand"
>    (ior (match_operand 0 "const_csr_operand")
>         (match_operand 0 "register_operand")))
>
> +;; V has 32-bit unsigned immediates.  This happens to be the same
> constraint as
> +;; the csr_operand, but it's not CSR related.
> +(define_predicate "vector_scalar_shift_operand"
> +  (match_operand 0 "csr_operand"))
> +
>  (define_predicate "sle_operand"
>    (and (match_code "const_int")
>         (match_test "SMALL_OPERAND (INTVAL (op) + 1)")))
> --
> 2.40.0
>
>