[InstCombine] reduce code for fadd with fneg operand; NFC
llvm-svn: 367224
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index 9363a5e..79d9ddd 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -1382,17 +1382,14 @@
if (Instruction *FoldedFAdd = foldBinOpIntoSelectOrPhi(I))
return FoldedFAdd;
- Value *LHS = I.getOperand(0), *RHS = I.getOperand(1);
- Value *X;
// (-X) + Y --> Y - X
- if (match(LHS, m_FNeg(m_Value(X))))
- return BinaryOperator::CreateFSubFMF(RHS, X, &I);
- // Y + (-X) --> Y - X
- if (match(RHS, m_FNeg(m_Value(X))))
- return BinaryOperator::CreateFSubFMF(LHS, X, &I);
+ Value *X, *Y;
+ if (match(&I, m_c_FAdd(m_FNeg(m_Value(X)), m_Value(Y))))
+ return BinaryOperator::CreateFSubFMF(Y, X, &I);
// Check for (fadd double (sitofp x), y), see if we can merge this into an
// integer add followed by a promotion.
+ Value *LHS = I.getOperand(0), *RHS = I.getOperand(1);
if (SIToFPInst *LHSConv = dyn_cast<SIToFPInst>(LHS)) {
Value *LHSIntVal = LHSConv->getOperand(0);
Type *FPType = LHSConv->getType();