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This patch implements transform for pattern "(A & ~B) ^ (~A) -> ~(A & B)".
Differential Revision: http://reviews.llvm.org/D4653 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214479 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2524,6 +2524,11 @@ Instruction *InstCombiner::visitXor(BinaryOperator &I) {
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match(Op1, m_Not(m_Specific(A))))
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match(Op1, m_Not(m_Specific(A))))
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return BinaryOperator::CreateOr(A, Builder->CreateNot(B));
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return BinaryOperator::CreateOr(A, Builder->CreateNot(B));
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// (A & ~B) ^ (~A) -> ~(A & B)
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if (match(Op0, m_And(m_Value(A), m_Not(m_Value(B)))) &&
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match(Op1, m_Not(m_Specific(A))))
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return BinaryOperator::CreateNot(Builder->CreateAnd(A, B));
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// (icmp1 A, B) ^ (icmp2 A, B) --> (icmp3 A, B)
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// (icmp1 A, B) ^ (icmp2 A, B) --> (icmp3 A, B)
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if (ICmpInst *RHS = dyn_cast<ICmpInst>(I.getOperand(1)))
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if (ICmpInst *RHS = dyn_cast<ICmpInst>(I.getOperand(1)))
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if (ICmpInst *LHS = dyn_cast<ICmpInst>(I.getOperand(0)))
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if (ICmpInst *LHS = dyn_cast<ICmpInst>(I.getOperand(0)))
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@ -145,3 +145,25 @@ define i32 @test12(i32 %A, i32 %B) {
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; CHECK-LABEL: @test12(
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: ret i32 0
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; CHECK-NEXT: ret i32 0
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}
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}
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define i32 @test13(i32 %a, i32 %b) {
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%negb = xor i32 %b, -1
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%and = and i32 %a, %negb
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%nega = xor i32 %a, -1
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%xor = xor i32 %and, %nega
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ret i32 %xor
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: %1 = and i32 %a, %b
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; CHECK-NEXT: %xor = xor i32 %1, -1
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}
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define i32 @test14(i32 %a, i32 %b) {
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%nega = xor i32 %a, -1
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%negb = xor i32 %b, -1
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%and = and i32 %a, %negb
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%xor = xor i32 %nega, %and
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ret i32 %xor
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; CHECK-LABEL: @test14(
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; CHECK-NEXT: %1 = and i32 %a, %b
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; CHECK-NEXT: %xor = xor i32 %1, -1
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}
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