[PATCH] D47983: [IR][PatternMatch] m_APInt(): allow undef elements.

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: spatel, craig.topper, RKSimon, arsenm.
Herald added a subscriber: wdng.

Allows to match more splatted vectors with integer constants,
with some elements being undef.
This deficiency was noticed during https://reviews.llvm.org/D47980.

This does not propagate `undef` elements, that would require
returning not the splatted `APInt`, but the vector itself,
which would require major changes on every callsite.

Later, i suppose some deduplication with `api_pred_ty` may be wanted.

Thoughts?


Repository:
  rL LLVM

https://reviews.llvm.org/D47983

Files:
  include/llvm/IR/PatternMatch.h
  test/Transforms/InstCombine/canonicalize-lshr-shl-to-masking.ll
  test/Transforms/InstCombine/canonicalize-shl-lshr-to-masking.ll
  test/Transforms/InstCombine/masked-merge-add.ll
  test/Transforms/InstCombine/masked-merge-xor.ll
  test/Transforms/InstCombine/vec_shuffle.ll

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