[PATCH] [x86]Delete dead code in ix86_expand_sse_comi.[PR98612]

Uros Bizjak ubizjak@gmail.com
Mon Jan 11 11:54:51 GMT 2021


On Mon, Jan 11, 2021 at 11:28 AM Hongtao Liu <crazylht@gmail.com> wrote:
>
> Hi:
>   d->flag is always 0 for builtins located in
> BDESC_FIRST (comi,COMI,...)
> ...
> BDESC_END (COMI, PCMPESTR)
>   So the condition can be deleted, so did BUILTIN_DESC_SWAP_OPERANDS.
>
>   Regtested and bootstrapped on x86_64-linux-gnu{-m32,}.
>
> gcc/ChangeLog:
>         PR target/98612
>         * config/i386/i386-builtins.h (BUILTIN_DESC_SWAP_OPERANDS):
>         Deleted.
>         * config/i386/i386-expand.c (ix86_expand_sse_comi): Delete
>         dead code.

OK.

Thanks,
Uros.

> ---
>  gcc/config/i386/i386-builtins.h | 4 ----
>  gcc/config/i386/i386-expand.c   | 5 -----
>  2 files changed, 9 deletions(-)
>
> diff --git a/gcc/config/i386/i386-builtins.h b/gcc/config/i386/i386-builtins.h
> index bb364458878..0641808c7a7 100644
> --- a/gcc/config/i386/i386-builtins.h
> +++ b/gcc/config/i386/i386-builtins.h
> @@ -236,10 +236,6 @@ struct builtin_isa {
>
>  /* Bits for builtin_description.flag.  */
>
> -/* Set when we don't support the comparison natively, and should
> -   swap_comparison in order to support it.  */
> -#define BUILTIN_DESC_SWAP_OPERANDS     1
> -
>  struct builtin_description
>  {
>    const HOST_WIDE_INT mask;
> diff --git a/gcc/config/i386/i386-expand.c b/gcc/config/i386/i386-expand.c
> index 85ea2605696..d793e5a5bce 100644
> --- a/gcc/config/i386/i386-expand.c
> +++ b/gcc/config/i386/i386-expand.c
> @@ -8634,11 +8634,6 @@ ix86_expand_sse_comi (const struct
> builtin_description *d, tree exp,
>    if (VECTOR_MODE_P (mode1))
>      op1 = safe_vector_operand (op1, mode1);
>
> -  /* Swap operands if we have a comparison that isn't available in
> -     hardware.  */
> -  if (d->flag & BUILTIN_DESC_SWAP_OPERANDS)
> -    std::swap (op0, op1);
> -
>    target = gen_reg_rtx (SImode);
>    emit_move_insn (target, const0_rtx);
>    target = gen_rtx_SUBREG (QImode, target, 0);
> --
> 2.18.1
>
> --
> BR,
> Hongtao


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