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Minor change to this file to support obscure cases with constant array amounts 

llvm-svn: 24030
This commit is contained in:
Chris Lattner 2005-10-27 05:53:56 +00:00
parent d8c5c066a1
commit bb17180a23
1 changed files with 16 additions and 5 deletions
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21
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1709,7 +1709,6 @@ Value *InstCombiner::FoldLogicalPlusAnd(Value *LHS, Value *RHS,
return InsertNewInstBefore(New, I);
}
Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
bool Changed = SimplifyCommutative(I);
Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
@ -3776,7 +3775,7 @@ Value *InstCombiner::InsertOperandCastBefore(Value *V, const Type *DestTy,
Instruction *InstCombiner::PromoteCastOfAllocation(CastInst &CI,
AllocationInst &AI) {
const PointerType *PTy = dyn_cast<PointerType>(CI.getType());
if (AI.isArrayAllocation() || !PTy) return 0;
if (!PTy) return 0; // Not casting the allocation to a pointer type.
// Remove any uses of AI that are dead.
assert(!CI.use_empty() && "Dead instructions should be removed earlier!");
@ -3813,12 +3812,23 @@ Instruction *InstCombiner::PromoteCastOfAllocation(CastInst &CI,
uint64_t AllocElTySize = TD->getTypeSize(AllocElTy);
uint64_t CastElTySize = TD->getTypeSize(CastElTy);
if (CastElTySize == 0 || AllocElTySize == 0) return 0;
// If the allocation is for an even multiple of the cast type size
if (CastElTySize == 0 || AllocElTySize % CastElTySize != 0)
Value *Amt = 0;
if (AllocElTySize % CastElTySize == 0) {
Amt = ConstantUInt::get(Type::UIntTy, AllocElTySize/CastElTySize);
if (ConstantUInt *CI = dyn_cast<ConstantUInt>(AI.getOperand(0)))
Amt = ConstantExpr::getMul(CI, cast<ConstantUInt>(Amt));
else {
// Perform an explicit scale.
Instruction *Tmp = BinaryOperator::createMul(Amt, AI.getOperand(0),"tmp");
Amt = InsertNewInstBefore(Tmp, AI);
}
} else {
return 0;
Value *Amt = ConstantUInt::get(Type::UIntTy,
AllocElTySize/CastElTySize);
}
std::string Name = AI.getName(); AI.setName("");
AllocationInst *New;
if (isa<MallocInst>(AI))
@ -4061,6 +4071,7 @@ Instruction *InstCombiner::visitCastInst(CastInst &CI) {
break;
}
}
return 0;
}