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[InstCombine] reduce code duplication; NFC

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llvm-svn: 339349
This commit is contained in:
Sanjay Patel 2018-08-09 15:07:13 +00:00
parent a966616fae
commit fdc2e3fdbb
1 changed files with 8 additions and 10 deletions
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18
lib/Transforms/InstCombine/InstCombineAddSub.cpp
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@ -1892,17 +1892,15 @@ Instruction *InstCombiner::visitFSub(BinaryOperator &I) {
// Similar to above, but look through a cast of the negated value:
// X - (fptrunc(-Y)) --> X + fptrunc(Y)
if (match(Op1, m_OneUse(m_FPTrunc(m_FNeg(m_Value(Y)))))) {
Value *TruncY = Builder.CreateFPTrunc(Y, I.getType());
return BinaryOperator::CreateFAddFMF(Op0, TruncY, &I);
}
// X - (fpext(-Y)) --> X + fpext(Y)
if (match(Op1, m_OneUse(m_FPExt(m_FNeg(m_Value(Y)))))) {
Value *ExtY = Builder.CreateFPExt(Y, I.getType());
return BinaryOperator::CreateFAddFMF(Op0, ExtY, &I);
}
Type *Ty = I.getType();
if (match(Op1, m_OneUse(m_FPTrunc(m_FNeg(m_Value(Y))))))
return BinaryOperator::CreateFAddFMF(Op0, Builder.CreateFPTrunc(Y, Ty), &I);
// Handle specials cases for FSub with selects feeding the operation
// X - (fpext(-Y)) --> X + fpext(Y)
if (match(Op1, m_OneUse(m_FPExt(m_FNeg(m_Value(Y))))))
return BinaryOperator::CreateFAddFMF(Op0, Builder.CreateFPExt(Y, Ty), &I);
// Handle special cases for FSub with selects feeding the operation
if (Value *V = SimplifySelectsFeedingBinaryOp(I, Op0, Op1))
return replaceInstUsesWith(I, V);