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[X86] Directly emit VPTERNLOG from canonicalizeBitSelect when possible.

Authored by craig.topper on Jul 3 2020, 10:08 PM.

Description

[X86] Directly emit VPTERNLOG from canonicalizeBitSelect when possible.

Seems to produce better results on some rotate tests. And is
neutral for other tests.

Details

Committed
craig.topperJul 3 2020, 10:08 PM
Parents
rGc352e0885a6b: [PowerPC] Implement probing for prologue
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