[Mesa-stable] [Mesa-dev] [PATCH] Revert "gallium: Force blend color to 16-byte alignment"

[Nicolai Hähnle]

Thanks! In addition to Emil's suggestion, please be sure to definitely 
reference the bugreport in the commit message:

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96835

With that fixed, the patch is

Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>


On 13.07.2016 17:39, Tim Rowley wrote:
> This reverts commit d8d6091a846ac2a40a011d512d6d57f6c8442e6a.
>
> Cc: <mesa-stable at lists.freedesktop.org>
> Signed-off-by: Tim Rowley <timothy.o.rowley at intel.com>
> ---
>   src/gallium/include/pipe/p_state.h | 12 +-----------
>   1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
> index a73a771..a3ae870 100644
> --- a/src/gallium/include/pipe/p_state.h
> +++ b/src/gallium/include/pipe/p_state.h
> @@ -326,17 +326,7 @@ struct pipe_blend_state
>
>   struct pipe_blend_color
>   {
> -   /**
> -    * Making the color array explicitly 16-byte aligned provides a hint to
> -    * compilers to make more efficient auto-vectorization optimizations.
> -    * The actual performance gains from vectorizing the blend color array are
> -    * fairly minimal, if any, but the alignment is necessary to work around
> -    * buggy vectorization in some compilers which fail to generate the correct
> -    * unaligned accessors resulting in a segfault.  Specifically several
> -    * versions of the Intel compiler are known to be affected but it's likely
> -    * others are as well.
> -    */
> -   PIPE_ALIGN_VAR(16) float color[4];
> +   float color[4];
>   };
>
>
>