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Remove dead code and fix indentation per Chris' review comments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33785 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4605,16 +4605,6 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
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if (Shift && !Shift->isShift())
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Shift = 0;
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// Check to see if there is a noop-cast between the shift and the and.
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if (!Shift) {
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if (CastInst *CI = dyn_cast<CastInst>(LHSI->getOperand(0)))
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if (CI->getOpcode() == Instruction::BitCast) {
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Shift = dyn_cast<BinaryOperator>(CI->getOperand(0));
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if (Shift && !Shift->isShift())
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Shift = 0;
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}
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}
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ConstantInt *ShAmt;
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ShAmt = Shift ? dyn_cast<ConstantInt>(Shift->getOperand(1)) : 0;
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const Type *Ty = Shift ? Shift->getType() : 0; // Type of the shift.
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@ -5487,7 +5477,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
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case Instruction::Add:
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case Instruction::And:
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case Instruction::Or:
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case Instruction::Xor:
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case Instruction::Xor: {
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// These operators commute.
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// Turn (Y + (X >> C)) << C -> (X + (Y << C)) & (~0 << C)
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if (isLeftShift && Op0BO->getOperand(1)->hasOneUse() &&
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@ -5507,10 +5497,11 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
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}
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// Turn (Y + ((X >> C) & CC)) << C -> ((X & (CC << C)) + (Y << C))
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if (isLeftShift && Op0BO->getOperand(1)->hasOneUse() &&
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match(Op0BO->getOperand(1), m_And(m_Shr(m_Value(V1), m_Value(V2)),
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m_ConstantInt(CC))) && V2 == Op1 &&
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cast<BinaryOperator>(Op0BO->getOperand(1))->getOperand(0)->hasOneUse()) {
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Value *Op0BOOp1 = Op0BO->getOperand(1);
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if (isLeftShift && Op0BOOp1->hasOneUse() && V2 == Op1 &&
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match(Op0BOOp1,
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m_And(m_Shr(m_Value(V1), m_Value(V2)),m_ConstantInt(CC))) &&
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cast<BinaryOperator>(Op0BOOp1)->getOperand(0)-> hasOneUse()) {
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Instruction *YS = BinaryOperator::createShl(
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Op0BO->getOperand(0), Op1,
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Op0BO->getName());
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@ -5522,9 +5513,10 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
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return BinaryOperator::create(Op0BO->getOpcode(), YS, XM);
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}
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}
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// FALL THROUGH.
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case Instruction::Sub:
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// FALL THROUGH.
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case Instruction::Sub: {
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// Turn ((X >> C) + Y) << C -> (X + (Y << C)) & (~0 << C)
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if (isLeftShift && Op0BO->getOperand(0)->hasOneUse() &&
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match(Op0BO->getOperand(0),
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@ -5562,6 +5554,7 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
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}
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break;
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}
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}
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@ -5616,12 +5609,6 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
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BinaryOperator *ShiftOp = dyn_cast<BinaryOperator>(Op0);
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if (ShiftOp && !ShiftOp->isShift())
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ShiftOp = 0;
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if (!ShiftOp)
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if (BitCastInst *CI = dyn_cast<BitCastInst>(Op0))
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// If this is a noop-integer cast of a shift instruction, use the shift.
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if (BinaryOperator *SI = dyn_cast<BinaryOperator>(CI->getOperand(0)))
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if (SI->isShift())
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ShiftOp = SI;
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if (ShiftOp && isa<ConstantInt>(ShiftOp->getOperand(1))) {
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// Find the operands and properties of the input shift. Note that the
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@ -6594,14 +6581,8 @@ Instruction *InstCombiner::FoldSelectOpOp(SelectInst &SI, Instruction *TI,
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else
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return BinaryOperator::create(BO->getOpcode(), NewSI, MatchOp);
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}
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assert(TI->isShift() && "Should only have Shift here");
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if (MatchIsOpZero)
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return BinaryOperator::create(Instruction::BinaryOps(TI->getOpcode()),
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MatchOp, NewSI);
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else
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return BinaryOperator::create(Instruction::BinaryOps(TI->getOpcode()),
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NewSI, MatchOp);
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assert(0 && "Shouldn't get here");
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return 0;
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}
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Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
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