[PATCH] D36996: [X86] Prevent several calls to ISD::isConstantSplatVector from returning a narrower APInt than the original scalar type
Craig Topper via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Aug 21 22:10:22 PDT 2017
craig.topper created this revision.
ISD::isConstantSplatVector can shrink to the smallest splat width. But we don't check the size of the resulting APInt at all. This can cause us to misinterpret the results.
This patch just adds a flag to prevent the APInt from changing width.
Fixes PR34271.
https://reviews.llvm.org/D36996
Files:
include/llvm/CodeGen/SelectionDAGNodes.h
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
lib/Target/X86/X86ISelLowering.cpp
test/CodeGen/X86/pr34271-1.ll
test/CodeGen/X86/pr34271.ll
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