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Remove incomplete cost analysis.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41354 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-08-24 05:21:13 +00:00
parent d3b51fd170
commit 7237d1167a
1 changed files with 3 additions and 40 deletions
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43
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@ -103,9 +103,6 @@ namespace {
/// DeadBB. LiveBB dominates split conidition's other branch.
void removeBlocks(BasicBlock *DeadBB, Loop *LP, BasicBlock *LiveBB);
/// Find cost of spliting loop L.
unsigned findSplitCost(Loop *L, SplitInfo &SD);
/// safeSplitCondition - Return true if it is possible to
/// split loop using given split condition.
bool safeSplitCondition(SplitInfo &SD);
@ -202,25 +199,10 @@ bool LoopIndexSplit::runOnLoop(Loop *IncomingLoop, LPPassManager &LPM_Ref) {
++SI;
}
unsigned MaxCost = 99;
unsigned Index = 0;
unsigned MostProfitableSDIndex = 0;
for (SmallVector<SplitInfo, 4>::iterator SI = SplitData.begin(),
E = SplitData.end(); SI != E; ++SI, ++Index) {
SplitInfo SD = *SI;
// ICM_EQs are already handled above.
assert (SD.SplitCondition->getPredicate() != ICmpInst::ICMP_EQ &&
"Unexpected split condition predicate");
unsigned Cost = findSplitCost(L, SD);
if (Cost < MaxCost)
MostProfitableSDIndex = Index;
}
// Split most profitiable condition.
if (!SplitData.empty())
Changed = splitLoop(SplitData[MostProfitableSDIndex]);
// FIXME : Implement cost analysis.
unsigned MostProfitableSDIndex = 0;
Changed = splitLoop(SplitData[MostProfitableSDIndex]);
if (Changed)
++NumIndexSplit;
@ -595,25 +577,6 @@ bool LoopIndexSplit::safeExitingBlock(SplitInfo &SD,
return true;
}
/// Find cost of spliting loop L. Cost is measured in terms of size growth.
/// Size is growth is calculated based on amount of code duplicated in second
/// loop.
unsigned LoopIndexSplit::findSplitCost(Loop *L, SplitInfo &SD) {
unsigned Cost = 0;
BasicBlock *SDBlock = SD.SplitCondition->getParent();
for (Loop::block_iterator I = L->block_begin(), E = L->block_end();
I != E; ++I) {
BasicBlock *BB = *I;
// If a block is not dominated by split condition block then
// it must be duplicated in both loops.
if (!DT->dominates(SDBlock, BB))
Cost += BB->size();
}
return Cost;
}
/// removeBlocks - Remove basic block DeadBB and all blocks dominated by DeadBB.
/// This routine is used to remove split condition's dead branch, dominated by
/// DeadBB. LiveBB dominates split conidition's other branch.