[Mesa-dev] [PATCH 1/2] i965/vs: Add a function to fix-up uniform arguments for 3-src insts.

[Eric Anholt]

Matt Turner <mattst88 at gmail.com> writes:

> Three-source instructions have a vertical stride overloaded to 4, which
> prevents directly using vec4 uniforms as arguments. Instead we need to
> insert a MOV instruction to do the replication for the three-source
> instruction.
>
> With this in place, we can use three-source instructions in the vertex
> shader. While some thought needs to go into deciding whether its better
> to use a three-source instruction rather than a sequence of equivalent
> instructions (when one or more sources are uniforms or immediates), this
> will allow us to skip a lot of ugly lowering code and use the BFE and
> BFI2 instructions directly.

These are:

Reviewed-by: Eric Anholt <ericAnholt.net>
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