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Remove a special case, allowing the general case to handle it. No functionality
change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24076 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3814,58 +3814,46 @@ Instruction *InstCombiner::PromoteCastOfAllocation(CastInst &CI,
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uint64_t CastElTySize = TD->getTypeSize(CastElTy);
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if (CastElTySize == 0 || AllocElTySize == 0) return 0;
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// If the allocation is for an even multiple of the cast type size
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Value *Amt = 0;
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if (AllocElTySize % CastElTySize == 0) {
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Amt = ConstantUInt::get(Type::UIntTy, AllocElTySize/CastElTySize);
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if (ConstantUInt *CI = dyn_cast<ConstantUInt>(AI.getOperand(0)))
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Amt = ConstantExpr::getMul(CI, cast<ConstantUInt>(Amt));
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else {
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// Perform an explicit scale.
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Instruction *Tmp = BinaryOperator::createMul(Amt, AI.getOperand(0),"tmp");
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Amt = InsertNewInstBefore(Tmp, AI);
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}
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} else {
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// See if we can satisfy the modulus by pulling a scale out of the array
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// size argument.
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unsigned ArraySizeScale = 1;
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Value *NumElements = AI.getOperand(0);
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if (ConstantUInt *CI = dyn_cast<ConstantUInt>(NumElements)) {
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ArraySizeScale = CI->getValue();
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NumElements = ConstantUInt::get(Type::UIntTy, 1);
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} else if (ShiftInst *SI = dyn_cast<ShiftInst>(NumElements)) {
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if (SI->getOpcode() == Instruction::Shl)
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if (ConstantUInt *CUI = dyn_cast<ConstantUInt>(SI->getOperand(1))) {
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// This is a value scaled by '1 << the shift amt'.
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NumElements = SI->getOperand(0);
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ArraySizeScale = 1U << CUI->getValue();
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}
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} else if (isa<Instruction>(NumElements) &&
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cast<Instruction>(NumElements)->getOpcode() == Instruction::Mul){
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BinaryOperator *BO = cast<BinaryOperator>(NumElements);
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if (ConstantUInt *Scale = dyn_cast<ConstantUInt>(BO->getOperand(1))) {
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// This value is scaled by 'Scale'.
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NumElements = BO->getOperand(0);
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ArraySizeScale = Scale->getValue();
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// See if we can satisfy the modulus by pulling a scale out of the array
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// size argument.
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unsigned ArraySizeScale = 1;
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Value *NumElements = AI.getOperand(0);
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if (ConstantUInt *CI = dyn_cast<ConstantUInt>(NumElements)) {
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ArraySizeScale = CI->getValue();
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NumElements = ConstantUInt::get(Type::UIntTy, 1);
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} else if (ShiftInst *SI = dyn_cast<ShiftInst>(NumElements)) {
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if (SI->getOpcode() == Instruction::Shl)
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if (ConstantUInt *CUI = dyn_cast<ConstantUInt>(SI->getOperand(1))) {
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// This is a value scaled by '1 << the shift amt'.
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NumElements = SI->getOperand(0);
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ArraySizeScale = 1U << CUI->getValue();
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}
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} else if (isa<Instruction>(NumElements) &&
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cast<Instruction>(NumElements)->getOpcode() == Instruction::Mul){
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BinaryOperator *BO = cast<BinaryOperator>(NumElements);
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if (ConstantUInt *Scale = dyn_cast<ConstantUInt>(BO->getOperand(1))) {
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// This value is scaled by 'Scale'.
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NumElements = BO->getOperand(0);
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ArraySizeScale = Scale->getValue();
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}
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// If we can now satisfy the modulus, by using a non-1 scale, we really can
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// do the xform.
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if ((AllocElTySize*ArraySizeScale) % CastElTySize != 0) return 0;
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}
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// If we can now satisfy the modulus, by using a non-1 scale, we really can
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// do the xform.
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if ((AllocElTySize*ArraySizeScale) % CastElTySize != 0) return 0;
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unsigned Scale = (AllocElTySize*ArraySizeScale)/CastElTySize;
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if (Scale == 1) {
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Amt = NumElements;
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} else {
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Amt = ConstantUInt::get(Type::UIntTy, Scale);
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if (ConstantUInt *CI = dyn_cast<ConstantUInt>(NumElements))
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Amt = ConstantExpr::getMul(CI, cast<ConstantUInt>(Amt));
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else if (Scale != 1) {
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Instruction *Tmp = BinaryOperator::createMul(Amt, NumElements, "tmp");
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Amt = InsertNewInstBefore(Tmp, AI);
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}
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unsigned Scale = (AllocElTySize*ArraySizeScale)/CastElTySize;
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Value *Amt = 0;
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if (Scale == 1) {
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Amt = NumElements;
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} else {
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Amt = ConstantUInt::get(Type::UIntTy, Scale);
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if (ConstantUInt *CI = dyn_cast<ConstantUInt>(NumElements))
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Amt = ConstantExpr::getMul(CI, cast<ConstantUInt>(Amt));
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else if (Scale != 1) {
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Instruction *Tmp = BinaryOperator::createMul(Amt, NumElements, "tmp");
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Amt = InsertNewInstBefore(Tmp, AI);
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}
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}
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