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Optimize pointer comparison into the typesafe form, now that the backends will
handle them efficiently. This is the opposite direction of the transformation we used to have here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92418 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4432,8 +4432,7 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
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// See if we can simplify any instructions used by the instruction whose sole
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// purpose is to compute bits we don't care about.
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if (SimplifyDemandedInstructionBits(I))
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return &I;
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return &I;
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if (ConstantInt *AndRHS = dyn_cast<ConstantInt>(Op1)) {
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const APInt &AndRHSMask = AndRHS->getValue();
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@ -7312,6 +7311,25 @@ Instruction *InstCombiner::visitICmpInstWithInstAndIntCst(ICmpInst &ICI,
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}
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}
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break;
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case Instruction::Or: {
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if (!ICI.isEquality() || !RHS->isNullValue() || !LHSI->hasOneUse())
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break;
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Value *P, *Q;
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if (match(LHSI, m_Or(m_PtrToInt(m_Value(P)), m_PtrToInt(m_Value(Q))))) {
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// Simplify icmp eq (or (ptrtoint P), (ptrtoint Q)), 0
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// -> and (icmp eq P, null), (icmp eq Q, null).
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Value *ICIP = Builder->CreateICmp(ICI.getPredicate(), P,
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Constant::getNullValue(P->getType()));
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Value *ICIQ = Builder->CreateICmp(ICI.getPredicate(), Q,
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Constant::getNullValue(Q->getType()));
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Instruction *And = BinaryOperator::CreateAnd(ICIP, ICIQ, "");
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And->takeName(&ICI);
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return And;
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}
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break;
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}
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case Instruction::Shl: { // (icmp pred (shl X, ShAmt), CI)
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ConstantInt *ShAmt = dyn_cast<ConstantInt>(LHSI->getOperand(1));
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@ -268,6 +268,19 @@ define i1 @test26(i32 %A, i32 %B) {
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; CHECK: ret i1
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}
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define i1 @test27(i32* %A, i32* %B) {
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%C1 = ptrtoint i32* %A to i32
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%C2 = ptrtoint i32* %B to i32
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%D = or i32 %C1, %C2
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%E = icmp eq i32 %D, 0
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ret i1 %E
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; CHECK: @test27
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; CHECK: icmp eq i32* %A, null
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; CHECK: icmp eq i32* %B, null
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; CHECK: and i1
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; CHECK: ret i1
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}
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; PR5634
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define i1 @test28(i32 %A, i32 %B) {
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%C1 = icmp ne i32 %A, 0
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