[Mesa-dev] [PATCH 4/5] i965/fs: Remove incorrect note of writing attr in centroid workaround.

[Eric Anholt]

Matt Turner <mattst88 at gmail.com> writes:

> On Wed, Apr 10, 2013 at 11:54 AM, Eric Anholt <eric at anholt.net> wrote:
>> This instruction doesn't update its IR destination, it just moves from
>> payload to f0.  This caused the dead code elimination pass I'm adding to
>> dead-code-eliminate the first step of interpolation.
>
> This was because it had a destination that was never read?

We were putting a vgrf in the destination, even though the instruction
didn't do anything to any vgrf.  We then inferred incorrect things about
what had happened with the vgrf.
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