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performance: cache the dereferenced use_iterator

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101250 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gabor Greif 2010-04-14 16:13:56 +00:00
parent 2c93e39072
commit 488d4421c6
1 changed files with 5 additions and 3 deletions
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8
lib/Transforms/Scalar/LICM.cpp
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@ -683,16 +683,18 @@ void LICM::PromoteValuesInLoop() {
// to LI as we are loading or storing. Since we know that the value is
// stored in this loop, this will always succeed.
for (Value::use_iterator UI = Ptr->use_begin(), E = Ptr->use_end();
UI != E; ++UI)
if (LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
UI != E; ++UI) {
User *U = *UI;
if (LoadInst *LI = dyn_cast<LoadInst>(U)) {
LoadValue = LI;
break;
} else if (StoreInst *SI = dyn_cast<StoreInst>(*UI)) {
} else if (StoreInst *SI = dyn_cast<StoreInst>(U)) {
if (SI->getOperand(1) == Ptr) {
LoadValue = SI->getOperand(0);
break;
}
}
}
assert(LoadValue && "No store through the pointer found!");
PointerValueNumbers.push_back(LoadValue); // Remember this for later.
}