[Beignet] [PATCH] support built-in function mad_sat(int) and mad_sat(uint)

[Zhigang Gong]

LGTM, pushed, thanks.

On Wed, Aug 14, 2013 at 04:23:18PM +0800, Homer Hsing wrote:
> this patch has been tested by piglit.
> piglit test cases "int_mad_sat" and "uint_mad_sat" passed.
> 
> Signed-off-by: Homer Hsing <homer.xing at intel.com>
> ---
>  backend/src/ocl_stdlib.tmpl.h | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/backend/src/ocl_stdlib.tmpl.h b/backend/src/ocl_stdlib.tmpl.h
> index d1cc6aa..2b5e470 100644
> --- a/backend/src/ocl_stdlib.tmpl.h
> +++ b/backend/src/ocl_stdlib.tmpl.h
> @@ -367,13 +367,20 @@ INLINE_OVERLOADABLE ushort mad_sat(ushort a, ushort b, ushort c) {
>    return x;
>  }
>  
> -/* XXX not implemented. */
>  INLINE_OVERLOADABLE int mad_sat(int a, int b, int c) {
> -  return 0;
> +  long x = (long)a * (long)b + (long)c;
> +  if (x > 0x7FFFFFFF)
> +    x = 0x7FFFFFFF;
> +  else if (x < -0x7FFFFFFF-1)
> +    x = -0x7FFFFFFF-1;
> +  return (int)x;
>  }
>  
>  INLINE_OVERLOADABLE uint mad_sat(uint a, uint b, uint c) {
> -  return 0;
> +  ulong x = (ulong)a * (ulong)b + (ulong)c;
> +  if (x > 0xFFFFFFFFu)
> +    x = 0xFFFFFFFFu;
> +  return (uint)x;
>  }
>  
>  INLINE_OVERLOADABLE uchar __rotate_left(uchar x, uchar y) { return (x << y) | (x >> (8 - y)); }
> -- 
> 1.8.1.2
> 
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