[FFmpeg-devel] [PATCH] increase alignment for DCT block arrays to 16

[Robert Swain]

On 05/04/2008, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Fri, Apr 04, 2008 at 08:56:34PM -0400, Alexander Strange wrote:
>  > Some decoders (MJPEG, WMV2) have their DCT block arrays aligned to 8 bytes,
>  > which causes obvious problems with an SSE2 IDCT. Either one of the attached
>  > patches fixes it; I wasn't sure if there would be problems with the first
>  > method, so I did it two ways.
>  >
>  > Method 1 - As with Altivec/MMI, redefine DECLARE_ALIGNED_8 and STRIDE_ALIGN
>  > to be 16. This has some other nice properties, since I won't have to assume
>  > picture pointers are only 8-byte aligned outside ffmpeg. It also means that
>  > nobody else can introduce a new decoder and have it break under SSE2.
>  >
>  > Method 2 - Just change the problematic DECLARE_ALIGNED_8 to _16.
>
>
> Method 2.

Applied.

Rob