Re: [Qemu-devel] [PATCH v2 01/10] target-arm: fix neon vshrn/vrshrn ops

[Laurent Desnogues <laurent.desnogues@gmail.com>]

On Sat, Oct 24, 2009 at 1:19 PM,  <juha.riihimaki@nokia.com> wrote:
> From: Juha Riihimäki <juha.riihimaki@nokia.com>
>
> In the existing code shift value is clobbered during the pass loop.
> This patch changes the code so that it stores the intermediate
> result in the target neon register directly and eliminates the need
> to use a temporary to hold the intermediate value thus leaving the
> shift value in the temporary variable intact. This is a new patch
> in this version of the patch series.
>
> Signed-off-by: Juha Riihimäki <juha.riihimaki@nokia.com>

Acked-by: Laurent Desnogues <laurent.desnogues@gmail.com>


Laurent

> ---
>  target-arm/translate.c |   12 +++---------
>  1 files changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/target-arm/translate.c b/target-arm/translate.c
> index 9d13d42..8a85db6 100644
> --- a/target-arm/translate.c
> +++ b/target-arm/translate.c
> @@ -4680,18 +4680,12 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
>                         else
>                             gen_neon_narrow_satu(size - 1, tmp, cpu_V0);
>                     }
> -                    if (pass == 0) {
> -                        if (size != 3) {
> -                            dead_tmp(tmp2);
> -                        }
> -                        tmp2 = tmp;
> -                    } else {
> -                        neon_store_reg(rd, 0, tmp2);
> -                        neon_store_reg(rd, 1, tmp);
> -                    }
> +                    neon_store_reg(rd, pass, tmp);
>                 } /* for pass */
>                 if (size == 3) {
>                     tcg_temp_free_i64(tmp64);
> +                } else {
> +                    dead_tmp(tmp2);
>                 }
>             } else if (op == 10) {
>                 /* VSHLL */
> --
> 1.6.5
>
>
>
>