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[X86][SSE] combineX86ShufflesRecursively - don't bother merging shuffles with…

Authored by RKSimon on Sun, Nov 3, 9:45 AM.

Description

[X86][SSE] combineX86ShufflesRecursively - don't bother merging shuffles with empty roots. NFCI.

This doesn't affect actual codegen, but is a minor refactor toward fixing PR43024 where we need to avoid excess changes (folding zeroables etc.) to the shuffle mask at Depth == 0.

Details

Committed
RKSimonSun, Nov 3, 9:46 AM
Parents
rG91661573fdea: [X86] Convert PICStyles::Style to scoped enum class. NFCI.
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