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[InstCombine] use AddOne helper to reduce code; NFC 

llvm-svn: 315709
This commit is contained in:
Sanjay Patel 2017-10-13 17:00:47 +00:00
parent 78f486d136
commit 76ed9eab29
1 changed files with 3 additions and 6 deletions
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9
llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
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@ -960,13 +960,9 @@ Instruction *InstCombiner::foldAddWithConstant(BinaryOperator &Add) {
return NV;
Value *X;
Type *Ty = Add.getType();
if (match(Op0, m_ZExt(m_Value(X))) &&
X->getType()->getScalarSizeInBits() == 1) {
if (match(Op0, m_ZExt(m_Value(X))) && X->getType()->getScalarSizeInBits() == 1)
// zext(bool) + C -> bool ? C + 1 : C
Constant *One = ConstantInt::get(Ty, 1);
return SelectInst::Create(X, ConstantExpr::getAdd(Op1C, One), Op1);
}
return SelectInst::Create(X, AddOne(Op1C), Op1);
const APInt *C;
if (!match(Op1, m_APInt(C)))
@ -985,6 +981,7 @@ Instruction *InstCombiner::foldAddWithConstant(BinaryOperator &Add) {
// Is this add the last step in a convoluted sext?
// add(zext(xor i16 X, -32768), -32768) --> sext X
Type *Ty = Add.getType();
const APInt *C2;
if (match(Op0, m_ZExt(m_Xor(m_Value(X), m_APInt(C2)))) &&
C2->isMinSignedValue() && C2->sext(Ty->getScalarSizeInBits()) == *C)