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Clean up the formatting and trailing whitespace of a routine before

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editting it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220146 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-10-18 23:19:03 +00:00
parent 440079e53e
commit 01dc911c73
1 changed files with 19 additions and 16 deletions
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35
lib/Analysis/Loads.cpp
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@ -139,9 +139,9 @@ bool llvm::isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom,
Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
BasicBlock::iterator &ScanFrom,
unsigned MaxInstsToScan,
AliasAnalysis *AA,
AAMDNodes *AATags) {
if (MaxInstsToScan == 0) MaxInstsToScan = ~0U;
AliasAnalysis *AA, AAMDNodes *AATags) {
if (MaxInstsToScan == 0)
MaxInstsToScan = ~0U;
// If we're using alias analysis to disambiguate get the size of *Ptr.
uint64_t AccessSize = 0;
@ -149,7 +149,7 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
Type *AccessTy = cast<PointerType>(Ptr->getType())->getElementType();
AccessSize = AA->getTypeStoreSize(AccessTy);
}
while (ScanFrom != ScanBB->begin()) {
// We must ignore debug info directives when counting (otherwise they
// would affect codegen).
@ -159,29 +159,32 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
// Restore ScanFrom to expected value in case next test succeeds
ScanFrom++;
// Don't scan huge blocks.
if (MaxInstsToScan-- == 0) return nullptr;
if (MaxInstsToScan-- == 0)
return nullptr;
--ScanFrom;
// If this is a load of Ptr, the loaded value is available.
// (This is true even if the load is volatile or atomic, although
// those cases are unlikely.)
if (LoadInst *LI = dyn_cast<LoadInst>(Inst))
if (AreEquivalentAddressValues(LI->getOperand(0), Ptr)) {
if (AATags) LI->getAAMetadata(*AATags);
if (AATags)
LI->getAAMetadata(*AATags);
return LI;
}
if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
// If this is a store through Ptr, the value is available!
// (This is true even if the store is volatile or atomic, although
// those cases are unlikely.)
if (AreEquivalentAddressValues(SI->getOperand(1), Ptr)) {
if (AATags) SI->getAAMetadata(*AATags);
if (AATags)
SI->getAAMetadata(*AATags);
return SI->getOperand(0);
}
// If Ptr is an alloca and this is a store to a different alloca, ignore
// the store. This is a trivial form of alias analysis that is important
// for reg2mem'd code.
@ -189,18 +192,18 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
(isa<AllocaInst>(SI->getOperand(1)) ||
isa<GlobalVariable>(SI->getOperand(1))))
continue;
// If we have alias analysis and it says the store won't modify the loaded
// value, ignore the store.
if (AA &&
(AA->getModRefInfo(SI, Ptr, AccessSize) & AliasAnalysis::Mod) == 0)
continue;
// Otherwise the store that may or may not alias the pointer, bail out.
++ScanFrom;
return nullptr;
}
// If this is some other instruction that may clobber Ptr, bail out.
if (Inst->mayWriteToMemory()) {
// If alias analysis claims that it really won't modify the load,
@ -208,13 +211,13 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
if (AA &&
(AA->getModRefInfo(Inst, Ptr, AccessSize) & AliasAnalysis::Mod) == 0)
continue;
// May modify the pointer, bail out.
++ScanFrom;
return nullptr;
}
}
// Got to the start of the block, we didn't find it, but are done for this
// block.
return nullptr;