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authorJason Ekstrand <[email protected]>2019-02-22 17:06:39 -0600
committerJason Ekstrand <[email protected]>2019-02-24 20:01:27 -0600
commit743700be1f583db28ff84104754f38bc6852668e (patch)
treedf83af961cb9e322eaf86dccb759297f46f47121 /src/gallium
parent724371c6b990d3a66ecebbe4bd1802c53e89ed46 (diff)
nir/builder: Don't emit no-op swizzles
The nir_swizzle helper is used some on it's own but it's also called by nir_channel and nir_channels which are used everywhere. It's pretty quick to check while we're walking the swizzle anyway whether or not it's an identity swizzle. If it is, we now don't bother emitting the instruction. Sure, copy-prop will clean it up for us but there's no sense making more work for the optimizer than we have to. Reviewed-by: Ian Romanick <[email protected]>
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