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[InstCombine] 'add (sub C1, X), C2 --> sub (add C1, C2), X' constant-fold

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362216 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Roman Lebedev
2019-05-31 09:47:04 +00:00
parent f1e9f3e56b
commit 08e5b97049
2 changed files with 18 additions and 19 deletions
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lib/Transforms/InstCombine/InstCombineAddSub.cpp
+8 -1
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@@ -872,7 +872,14 @@ Instruction *InstCombiner::foldAddWithConstant(BinaryOperator &Add) {
if (Instruction *NV = foldBinOpIntoSelectOrPhi(Add))
return NV;
Value *X, *Y;
Value *X;
Constant *Op00C;
// add (sub C1, X), C2 --> sub (add C1, C2), X
if (match(Op0, m_Sub(m_Constant(Op00C), m_Value(X))))
return BinaryOperator::CreateSub(ConstantExpr::getAdd(Op00C, Op1C), X);
Value *Y;
// add (sub X, Y), -1 --> add (not Y), X
if (match(Op0, m_OneUse(m_Sub(m_Value(X), m_Value(Y)))) &&