[PATCH] D63138: [Analysis] add isSplatValue() for vectors in IR

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: RKSimon, nikic, lebedev.ri.
Herald added subscribers: hiraditya, mcrosier.
Herald added a project: LLVM.

We have the related getSplatValue() already in IR (see code just above the proposed addition). But sometimes we only need to know that the value is a splat rather than capture the splatted scalar value. Also, we have an isSplatValue() function already in SDAG.

Motivation - recent bugs that would potentially benefit from improved splat analysis in IR:
https://bugs.llvm.org/show_bug.cgi?id=37428
https://bugs.llvm.org/show_bug.cgi?id=42174


https://reviews.llvm.org/D63138

Files:
  llvm/include/llvm/Analysis/VectorUtils.h
  llvm/lib/Analysis/VectorUtils.cpp
  llvm/unittests/Analysis/VectorUtilsTest.cpp

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