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[InstCombine] Speculatively implement a fix for what might be the root cause of PR33721 by making sure that we have integer types before doing select C, -1, 0 -> sext C to int

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I recently changed m_One and m_AllOnes to use Constant::isOneValue/isAllOnesValue which work on floating point values too. The original implementation looked specifically for ConstantInt scalars and splats. So I'm guessing we are accidentally trying to issue sext/zexts on floating point types now.

Hopefully I figure out how to reproduce the failure from the PR soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307486 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2017-07-09 03:25:17 +00:00
parent db24b6e4f7
commit 1e0e5aa155
1 changed files with 2 additions and 1 deletions
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3
lib/Transforms/InstCombine/InstCombineSelect.cpp
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@ -1223,7 +1223,8 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
// select i1 %c, <2 x i8> <1, 1>, <2 x i8> <0, 0>
// because that may need 3 instructions to splat the condition value:
// extend, insertelement, shufflevector.
if (CondVal->getType()->isVectorTy() == SelType->isVectorTy()) {
if (SelType->isIntOrIntVectorTy() &&
CondVal->getType()->isVectorTy() == SelType->isVectorTy()) {
// select C, 1, 0 -> zext C to int
if (match(TrueVal, m_One()) && match(FalseVal, m_Zero()))
return new ZExtInst(CondVal, SelType);