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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 Differential Revision: https://reviews.llvm.org/D63138 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363106 91177308-0d34-0410-b5e6-96231b3b80d8
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