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Actually delete this code, since it's really not clear what it's 

trying to do.

llvm-svn: 175014
This commit is contained in:
Dan Gohman 2013-02-12 22:26:41 +00:00
parent 60261eadbd
commit a6307574d6
1 changed files with 0 additions and 24 deletions
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24
llvm/lib/Transforms/Scalar/GVN.cpp
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@ -1526,10 +1526,8 @@ bool GVN::processNonLocalLoad(LoadInst *LI) {
BasicBlock *LoadBB = LI->getParent();
BasicBlock *TmpBB = LoadBB;
bool isSinglePred = false;
bool allSingleSucc = true;
while (TmpBB->getSinglePredecessor()) {
isSinglePred = true;
TmpBB = TmpBB->getSinglePredecessor();
if (TmpBB == LoadBB) // Infinite (unreachable) loop.
return false;
@ -1548,28 +1546,6 @@ bool GVN::processNonLocalLoad(LoadInst *LI) {
assert(TmpBB);
LoadBB = TmpBB;
// FIXME: It is extremely unclear what this loop is doing, other than
// artificially restricting loadpre.
if (isSinglePred) {
bool isHot = false;
for (unsigned i = 0, e = ValuesPerBlock.size(); i != e; ++i) {
const AvailableValueInBlock &AV = ValuesPerBlock[i];
if (AV.isSimpleValue())
// "Hot" Instruction is in some loop (because it dominates its dep.
// instruction).
if (Instruction *I = dyn_cast<Instruction>(AV.getSimpleValue()))
if (DT->dominates(LI, I)) {
isHot = true;
break;
}
}
// We are interested only in "hot" instructions. We don't want to do any
// mis-optimizations here.
if (!isHot)
return false;
}
// Check to see how many predecessors have the loaded value fully
// available.
DenseMap<BasicBlock*, Value*> PredLoads;