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refactor some code, no functionality change. On the path to PR1639

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llvm-svn: 41929
This commit is contained in:
Chris Lattner 2007-09-13 17:29:05 +00:00
parent 31d34baa89
commit c9f2f2dd92
1 changed files with 56 additions and 50 deletions
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106
lib/Transforms/IPO/GlobalOpt.cpp
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@ -891,63 +891,69 @@ static bool GlobalLoadUsesSimpleEnoughForHeapSRA(GlobalVariable *GV) {
return true;
}
/// RewriteHeapSROALoadUser - Given a load instruction and a value derived from
/// the load, rewrite the derived value to use the HeapSRoA'd load.
static void RewriteHeapSROALoadUser(LoadInst *Load, Instruction *LoadUser,
const std::vector<GlobalVariable*> &FieldGlobals,
std::vector<Value *> &InsertedLoadsForPtr) {
// If this is a comparison against null, handle it.
if (ICmpInst *SCI = dyn_cast<ICmpInst>(LoadUser)) {
assert(isa<ConstantPointerNull>(SCI->getOperand(1)));
// If we have a setcc of the loaded pointer, we can use a setcc of any
// field.
Value *NPtr;
if (InsertedLoadsForPtr.empty()) {
NPtr = new LoadInst(FieldGlobals[0], Load->getName()+".f0", Load);
InsertedLoadsForPtr.push_back(Load);
} else {
NPtr = InsertedLoadsForPtr.back();
}
Value *New = new ICmpInst(SCI->getPredicate(), NPtr,
Constant::getNullValue(NPtr->getType()),
SCI->getName(), SCI);
SCI->replaceAllUsesWith(New);
SCI->eraseFromParent();
return;
}
// Otherwise, this should be: 'getelementptr Ptr, Idx, uint FieldNo ...'
GetElementPtrInst *GEPI = cast<GetElementPtrInst>(LoadUser);
assert(GEPI->getNumOperands() >= 3 && isa<ConstantInt>(GEPI->getOperand(2))
&& "Unexpected GEPI!");
// Load the pointer for this field.
unsigned FieldNo = cast<ConstantInt>(GEPI->getOperand(2))->getZExtValue();
if (InsertedLoadsForPtr.size() <= FieldNo)
InsertedLoadsForPtr.resize(FieldNo+1);
if (InsertedLoadsForPtr[FieldNo] == 0)
InsertedLoadsForPtr[FieldNo] = new LoadInst(FieldGlobals[FieldNo],
Load->getName()+".f" +
utostr(FieldNo), Load);
Value *NewPtr = InsertedLoadsForPtr[FieldNo];
// Create the new GEP idx vector.
SmallVector<Value*, 8> GEPIdx;
GEPIdx.push_back(GEPI->getOperand(1));
GEPIdx.append(GEPI->op_begin()+3, GEPI->op_end());
Value *NGEPI = new GetElementPtrInst(NewPtr, GEPIdx.begin(), GEPIdx.end(),
GEPI->getName(), GEPI);
GEPI->replaceAllUsesWith(NGEPI);
GEPI->eraseFromParent();
}
/// RewriteUsesOfLoadForHeapSRoA - We are performing Heap SRoA on a global. Ptr
/// is a value loaded from the global. Eliminate all uses of Ptr, making them
/// use FieldGlobals instead. All uses of loaded values satisfy
/// GlobalLoadUsesSimpleEnoughForHeapSRA.
static void RewriteUsesOfLoadForHeapSRoA(LoadInst *Ptr,
static void RewriteUsesOfLoadForHeapSRoA(LoadInst *Load,
const std::vector<GlobalVariable*> &FieldGlobals) {
std::vector<Value *> InsertedLoadsForPtr;
//InsertedLoadsForPtr.resize(FieldGlobals.size());
while (!Ptr->use_empty()) {
Instruction *User = Ptr->use_back();
// If this is a comparison against null, handle it.
if (ICmpInst *SCI = dyn_cast<ICmpInst>(User)) {
assert(isa<ConstantPointerNull>(SCI->getOperand(1)));
// If we have a setcc of the loaded pointer, we can use a setcc of any
// field.
Value *NPtr;
if (InsertedLoadsForPtr.empty()) {
NPtr = new LoadInst(FieldGlobals[0], Ptr->getName()+".f0", Ptr);
InsertedLoadsForPtr.push_back(Ptr);
} else {
NPtr = InsertedLoadsForPtr.back();
}
Value *New = new ICmpInst(SCI->getPredicate(), NPtr,
Constant::getNullValue(NPtr->getType()),
SCI->getName(), SCI);
SCI->replaceAllUsesWith(New);
SCI->eraseFromParent();
continue;
}
// Otherwise, this should be: 'getelementptr Ptr, Idx, uint FieldNo ...'
GetElementPtrInst *GEPI = cast<GetElementPtrInst>(User);
assert(GEPI->getNumOperands() >= 3 && isa<ConstantInt>(GEPI->getOperand(2))
&& "Unexpected GEPI!");
// Load the pointer for this field.
unsigned FieldNo = cast<ConstantInt>(GEPI->getOperand(2))->getZExtValue();
if (InsertedLoadsForPtr.size() <= FieldNo)
InsertedLoadsForPtr.resize(FieldNo+1);
if (InsertedLoadsForPtr[FieldNo] == 0)
InsertedLoadsForPtr[FieldNo] = new LoadInst(FieldGlobals[FieldNo],
Ptr->getName()+".f" +
utostr(FieldNo), Ptr);
Value *NewPtr = InsertedLoadsForPtr[FieldNo];
// Create the new GEP idx vector.
SmallVector<Value*, 8> GEPIdx;
GEPIdx.push_back(GEPI->getOperand(1));
GEPIdx.append(GEPI->op_begin()+3, GEPI->op_end());
Value *NGEPI = new GetElementPtrInst(NewPtr, GEPIdx.begin(), GEPIdx.end(),
GEPI->getName(), GEPI);
GEPI->replaceAllUsesWith(NGEPI);
GEPI->eraseFromParent();
}
while (!Load->use_empty())
RewriteHeapSROALoadUser(Load, Load->use_back(),
FieldGlobals, InsertedLoadsForPtr);
}
/// PerformHeapAllocSRoA - MI is an allocation of an array of structures. Break