On Friday, April 22, 2016 3:01:27 PM PDT Juha-Pekka Heikkila wrote:
> base_mrf is unsigned, checking if its greater or equal to zero will
> not fail.
> 
> Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikk...@gmail.com>
> ---
>  src/mesa/drivers/dri/i965/brw_blorp_clear.cpp | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/mesa/drivers/dri/i965/brw_blorp_clear.cpp b/src/mesa/
drivers/dri/i965/brw_blorp_clear.cpp
> index 51f915d..06ac69e 100644
> --- a/src/mesa/drivers/dri/i965/brw_blorp_clear.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_blorp_clear.cpp
> @@ -314,7 +314,7 @@ brw_blorp_const_color_program::compile(struct 
brw_context *brw,
>     /* Now write to the render target and terminate the thread */
>     brw_fb_WRITE(&func,
>                  16 /* dispatch_width */,
> -                base_mrf >= 0 ? brw_message_reg(base_mrf) : mrf_rt_write,
> +                brw_message_reg(base_mrf),
>                  brw_null_reg() /* header */,
>                  msg_type,
>                  BRW_BLORP_RENDERBUFFER_BINDING_TABLE_INDEX,
> 

Yeah, this is definitely dead - base_mrf seems to always equal 2.
Thanks for catching this :)

The two parts of the conditional should be equivalent.  One has an
<8,8,1> region and the other <16,16,1> but those refer to the same
region, AFAIK.

I'd be tempted to just use mrf_rt_write unconditionally.  If we go with
your patch, we should delete mrf_rt_write because it becomes dead.

Topi, thoughts?

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