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preserve NUW/NSW when transforming add x,x
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125711 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -147,8 +147,13 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
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return BinaryOperator::CreateXor(LHS, RHS);
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// X + X --> X << 1
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if (LHS == RHS && I.getType()->isIntegerTy())
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return BinaryOperator::CreateShl(LHS, ConstantInt::get(I.getType(), 1));
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if (LHS == RHS && I.getType()->isIntegerTy()) {
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BinaryOperator *New =
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BinaryOperator::CreateShl(LHS, ConstantInt::get(I.getType(), 1));
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New->setHasNoSignedWrap(I.hasNoSignedWrap());
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New->setHasNoUnsignedWrap(I.hasNoUnsignedWrap());
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return New;
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}
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// -A + B --> B - A
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// -A + -B --> -(A + B)
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@ -33,3 +33,11 @@ define i32 @test3(i32 %A) {
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; CHECK-NEXT: ret i32
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}
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define i32 @test4(i32 %A) {
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%B = add nuw i32 %A, %A
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ret i32 %B
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; CHECK: @test4
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; CHECK-NEXT: %B = shl nuw i32 %A, 1
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; CHECK-NEXT: ret i32 %B
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}
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