Re: [Qemu-devel] [PATCH 24/34] target/ppc: convert xxspltw to vector operations

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Dec 17, 2018 at 10:39:01PM -0800, Richard Henderson wrote:
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Acked-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  target/ppc/translate/vsx-impl.inc.c | 36 +++++++++--------------------
>  1 file changed, 11 insertions(+), 25 deletions(-)
> 
> diff --git a/target/ppc/translate/vsx-impl.inc.c b/target/ppc/translate/vsx-impl.inc.c
> index d88d6bbd74..a040038ed4 100644
> --- a/target/ppc/translate/vsx-impl.inc.c
> +++ b/target/ppc/translate/vsx-impl.inc.c
> @@ -1318,38 +1318,24 @@ static void gen_xxsel(DisasContext * ctx)
>  
>  static void gen_xxspltw(DisasContext *ctx)
>  {
> -    TCGv_i64 b, b2;
> -    TCGv_i64 vsr;
> -
> -    vsr = tcg_temp_new_i64();
> -    if (UIM(ctx->opcode) & 2) {
> -        get_cpu_vsrl(vsr, xB(ctx->opcode));
> -    } else {
> -        get_cpu_vsrh(vsr, xB(ctx->opcode));
> -    }
> +    int rt = xT(ctx->opcode);
> +    int rb = xB(ctx->opcode);
> +    int uim = UIM(ctx->opcode);
> +    int tofs, bofs;
>  
>      if (unlikely(!ctx->vsx_enabled)) {
>          gen_exception(ctx, POWERPC_EXCP_VSXU);
>          return;
>      }
>  
> -    b = tcg_temp_new_i64();
> -    b2 = tcg_temp_new_i64();
> +    tofs = vsr_full_offset(rt);
> +    bofs = vsr_full_offset(rb);
> +    bofs += uim << MO_32;
> +#ifndef HOST_WORDS_BIG_ENDIAN
> +    bofs ^= 8 | 4;
> +#endif
>  
> -    if (UIM(ctx->opcode) & 1) {
> -        tcg_gen_ext32u_i64(b, vsr);
> -    } else {
> -        tcg_gen_shri_i64(b, vsr, 32);
> -    }
> -
> -    tcg_gen_shli_i64(b2, b, 32);
> -    tcg_gen_or_i64(vsr, b, b2);
> -    set_cpu_vsrh(xT(ctx->opcode), vsr);
> -    set_cpu_vsrl(xT(ctx->opcode), vsr);
> -
> -    tcg_temp_free_i64(vsr);
> -    tcg_temp_free_i64(b);
> -    tcg_temp_free_i64(b2);
> +    tcg_gen_gvec_dup_mem(MO_32, tofs, bofs, 16, 16);
>  }
>  
>  #define pattern(x) (((x) & 0xff) * (~(uint64_t)0 / 0xff))

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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