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* Actually USE the statistic that we made

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* Implement SRoA for arrays


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6349 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-05-27 16:09:27 +00:00
parent a161f0c7c9
commit d10376bee5
1 changed files with 21 additions and 6 deletions
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27
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -52,12 +52,15 @@ bool SROA::runOnFunction(Function &F) {
WorkList.pop_back();
// We cannot transform the allocation instruction if it is an array
// allocation, and an allocation of a scalar value cannot be decomposed
// allocation (allocations OF arrays are ok though), and an allocation of a
// scalar value cannot be decomposed at all.
//
if (AI->isArrayAllocation() ||
(!isa<StructType>(AI->getAllocatedType()) /*&&
!isa<ArrayType>(AI->getAllocatedType())*/
)) continue;
(!isa<StructType>(AI->getAllocatedType()) &&
!isa<ArrayType>(AI->getAllocatedType()))) continue;
const ArrayType *AT = dyn_cast<ArrayType>(AI->getAllocatedType());
// Loop over the use list of the alloca. We can only transform it if there
// are only getelementptr instructions (with a zero first index) and free
// instructions.
@ -77,6 +80,18 @@ bool SROA::runOnFunction(Function &F) {
CannotTransform = true;
break;
}
// If this is an array access, check to make sure that index falls
// within the array. If not, something funny is going on, so we won't
// do the optimization.
if (AT && cast<ConstantSInt>(GEPI->getOperand(2))->getValue() >=
AT->getNumElements()) {
DEBUG(std::cerr << "Cannot transform: " << *AI << " due to user: "
<< User);
CannotTransform = true;
break;
}
} else {
DEBUG(std::cerr << "Cannot transform: " << *AI << " due to user: "
<< User);
@ -100,7 +115,6 @@ bool SROA::runOnFunction(Function &F) {
WorkList.push_back(NA); // Add to worklist for recursive processing
}
} else {
const ArrayType *AT = cast<ArrayType>(AI->getAllocatedType());
ElementAllocas.reserve(AT->getNumElements());
const Type *ElTy = AT->getElementType();
for (unsigned i = 0, e = AT->getNumElements(); i != e; ++i) {
@ -158,6 +172,7 @@ bool SROA::runOnFunction(Function &F) {
// Finally, delete the Alloca instruction
AI->getParent()->getInstList().erase(AI);
NumReplaced++;
}
return Changed;