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[InstCombine] Use m_SpecificInt instead of m_APInt + comparison. NFCI.

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This commit is contained in:
Simon Pilgrim 2020-10-15 16:03:34 +01:00
parent 2eb22bd836
commit dbf16ebda1
1 changed files with 7 additions and 8 deletions
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15
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@ -2824,18 +2824,17 @@ Instruction *InstCombinerImpl::visitOr(BinaryOperator &I) {
}
}
// or(ashr(subNSW(Y, X), ScalarSizeInBits(Y)-1), X) --> X s> Y ? -1 : X.
// or(ashr(subNSW(Y, X), ScalarSizeInBits(Y) - 1), X) --> X s> Y ? -1 : X.
{
Value *X, *Y;
const APInt *ShAmt;
Type *Ty = I.getType();
if (match(&I, m_c_Or(m_OneUse(m_AShr(m_NSWSub(m_Value(Y), m_Value(X)),
m_APInt(ShAmt))),
m_Deferred(X))) &&
*ShAmt == Ty->getScalarSizeInBits() - 1) {
if (match(&I, m_c_Or(m_OneUse(m_AShr(
m_NSWSub(m_Value(Y), m_Value(X)),
m_SpecificInt(Ty->getScalarSizeInBits() - 1))),
m_Deferred(X)))) {
Value *NewICmpInst = Builder.CreateICmpSGT(X, Y);
return SelectInst::Create(NewICmpInst, ConstantInt::getAllOnesValue(Ty),
X);
Value *AllOnes = ConstantInt::getAllOnesValue(Ty);
return SelectInst::Create(NewICmpInst, AllOnes, X);
}
}