[Mesa-dev] [PATCH] i965: Use SIMD16 math on Ivybridge.

[Eric Anholt]

On Mon, 26 Sep 2011 16:51:34 -0700, Kenneth Graunke <kenneth at whitecape.org> wrote:
> Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
>
> ---
>  src/mesa/drivers/dri/i965/brw_fs_emit.cpp |   14 ++++++++++----
>  1 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/src/mesa/drivers/dri/i965/brw_fs_emit.cpp b/src/mesa/drivers/dri/i965/brw_fs_emit.cpp
> index 8176a76..b35d558 100644
> --- a/src/mesa/drivers/dri/i965/brw_fs_emit.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_fs_emit.cpp
> @@ -151,7 +151,10 @@ fs_visitor::generate_math1_gen6(fs_inst *inst,
>  
>     assert(inst->mlen == 0);
>  
> -   brw_set_compression_control(p, BRW_COMPRESSION_NONE);
> +   bool force_simd8 = intel->gen < 7 || dst.type != BRW_REGISTER_TYPE_F;
> +
> +   if (force_simd8)
> +      brw_set_compression_control(p, BRW_COMPRESSION_NONE);

I'm not following why force simd8 for dst.type != BRW_REGISTER_TYPE_F.

Also, it looks like we could drop the math workaround stuff for the VS
on IVB?
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