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[X86][AVX] Enable INSERT_SUBVECTOR(SRC0, SHUFFLE(SRC1)) shuffle combining

Description

[X86][AVX] Enable INSERT_SUBVECTOR(SRC0, SHUFFLE(SRC1)) shuffle combining

Push the insert_subvector up through the shuffle operands to help find more cross-lane shuffles.

The is exposes a couple of minor issues that will be fixed shortly:
Missed broadcast folds - we have a mixture of vzext_load lengths that need cleaning up
combine-sdiv.ll - AVX1 SimplifyDemandedVectorElts failure (hits max depth due to a couple of extra bitcasts).

Details

Committed
RKSimonFeb 2 2019, 10:08 AM
Parents
rL352962: Add GSoC 2019 stub
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