[Beignet] [PATCH] GBE: disable spill register under simd16 mode.

[Song, Ruiling]

LGTM

> -----Original Message-----
> From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
> Zhigang Gong
> Sent: Friday, November 21, 2014 12:09 PM
> To: beignet at lists.freedesktop.org
> Cc: Gong, Zhigang
> Subject: [Beignet] [PATCH] GBE: disable spill register under simd16 mode.
> 
> Register spilling awlays cost much more than fallback to simd8 which could
> avoid register spilling or at least reduce the spilled registers.
> 
> Signed-off-by: Zhigang Gong <zhigang.gong at intel.com>
> ---
>  backend/src/backend/gen_program.cpp | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/backend/src/backend/gen_program.cpp
> b/backend/src/backend/gen_program.cpp
> index 05d830a..46fcb67 100644
> --- a/backend/src/backend/gen_program.cpp
> +++ b/backend/src/backend/gen_program.cpp
> @@ -135,7 +135,6 @@ namespace gbe {
>      bool limitRegisterPressure;
>    } codeGenStrategy[] = {
>      {16, 0, false},
> -    {16, 10, false},
>      {8, 0, false},
>      {8, 8, false},
>      {8, 16, false},
> @@ -151,9 +150,9 @@ namespace gbe {
>      uint32_t codeGen = 0;
>      GenContext *ctx = NULL;
>      if (fn->getSimdWidth() == 8) {
> -      codeGen = 2;
> +      codeGen = 1;
>      } else if (fn->getSimdWidth() == 16) {
> -      codeGenNum = 2;
> +      codeGenNum = 1;
>      } else if (fn->getSimdWidth() == 0) {
>        codeGen = 0;
>      } else
> --
> 1.8.3.2
> 
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