Simon Pilgrim 2885d1251f [X86] Fold bitcast(logic(bitcast(X), Y)) --> logic'(X, bitcast(Y)) for int-int bitcasts ...

Extend the existing combine that handles bitcasting for fp-logic ops to also help remove logic ops across bitcasts to/from the same integer types.

This helps improve AVX512 predicate handling for D/Q logic ops and also allows DAGCombine's scalarizeExtractedBinop to remove some annoying gpr->simd->gpr transfers.

The concat_vectors regression in pr40891.ll will be addressed in a followup commit on this patch.

Differential Revision: https://reviews.llvm.org/D96206

2021-02-21 14:40:54 +00:00

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