[Beignet] [PATCH] add 64-bit version of "clz"

[Zhigang Gong]

LGTM, thanks.

On Mon, Sep 02, 2013 at 04:33:23PM +0800, Homer Hsing wrote:
> this patch passes following piglit test cases:
> 
>  piglit/framework/../bin/cl-program-tester generated_tests/cl/builtin/int/builtin-ulong-clz-1.0.generated.cl
>  piglit/framework/../bin/cl-program-tester generated_tests/cl/builtin/int/builtin-long-clz-1.0.generated.cl
> 
> Signed-off-by: Homer Hsing <homer.xing at intel.com>
> ---
>  backend/src/ocl_stdlib.tmpl.h | 20 ++++++++++++++++++--
>  1 file changed, 18 insertions(+), 2 deletions(-)
> 
> diff --git a/backend/src/ocl_stdlib.tmpl.h b/backend/src/ocl_stdlib.tmpl.h
> index 0a6a937..f209b52 100644
> --- a/backend/src/ocl_stdlib.tmpl.h
> +++ b/backend/src/ocl_stdlib.tmpl.h
> @@ -313,11 +313,27 @@ INLINE_OVERLOADABLE uint clz(uint x) {
>  }
>  
>  INLINE_OVERLOADABLE long clz(long x) {
> -  return 0;
> +  if (x < 0)
> +    return 0;
> +  if (x == 0)
> +    return 64;
> +  union { int i[2]; long x; } u;
> +  u.x = x;
> +  uint v = clz(u.i[1]);
> +  if(v == 32)
> +    v += clz(u.i[0]);
> +  return v;
>  }
>  
>  INLINE_OVERLOADABLE ulong clz(ulong x) {
> -  return 0;
> +  if (x == 0)
> +    return 64;
> +  union { uint i[2]; ulong x; } u;
> +  u.x = x;
> +  uint v = clz(u.i[1]);
> +  if(v == 32)
> +    v += clz(u.i[0]);
> +  return v;
>  }
>  
>  OVERLOADABLE int __gen_ocl_mul_hi(int x, int y);
> -- 
> 1.8.1.2
> 
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