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Commit 5705dc76 authored by Noah Goldstein's avatar Noah Goldstein
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Recommit "[X86] Add `TuningPreferShiftShuffle` for when Shifts are preferable... 

Recommit "[X86] Add `TuningPreferShiftShuffle` for when Shifts are preferable to shuffles." (2nd Try)

Move the opcode checks to after we have already verified we found a
valid shift instruction (`0 < ShiftAmt`) in `matchUnaryPermuteShuffle`
and `lowerShuffleAsShift`.

Reviewed By: pengfei, RKSimon

Differential Revision: https://reviews.llvm.org/D143786
parent 6b5afda6
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