Matt Turner <[email protected]> writes: > The Haswell Bspec says "A SIMD16 instruction is not allowed." (but > 16-wide BFI1 works for me so far). Since GLSL's bitfieldInsert() > function takes int parameters BFI1 produces the same results in all > channels, so there's never any reason to emit a 16-wide BFI1.
Suppose the first 8 pixels didn't take a branch, while the second 8 did, and you're bitfield inserting in this branch. You'd be using undefined values for src[0].
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