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Move the getNonLocalDependency method to a more logical place in

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the file, no functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60265 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-11-30 01:18:27 +00:00
parent 0e0a5b690c
commit 37d041c25f
1 changed files with 89 additions and 90 deletions
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179
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -96,96 +96,6 @@ getCallSiteDependency(CallSite C, BasicBlock::iterator ScanIt,
return MemDepResult::getNonLocal();
}
/// getNonLocalDependency - Perform a full dependency query for the
/// specified instruction, returning the set of blocks that the value is
/// potentially live across. The returned set of results will include a
/// "NonLocal" result for all blocks where the value is live across.
///
/// This method assumes the instruction returns a "nonlocal" dependency
/// within its own block.
///
void MemoryDependenceAnalysis::
getNonLocalDependency(Instruction *QueryInst,
SmallVectorImpl<std::pair<BasicBlock*,
MemDepResult> > &Result) {
assert(getDependency(QueryInst).isNonLocal() &&
"getNonLocalDependency should only be used on insts with non-local deps!");
DenseMap<BasicBlock*, DepResultTy> &Cache = NonLocalDeps[QueryInst];
/// DirtyBlocks - This is the set of blocks that need to be recomputed. In
/// the cached case, this can happen due to instructions being deleted etc. In
/// the uncached case, this starts out as the set of predecessors we care
/// about.
SmallVector<BasicBlock*, 32> DirtyBlocks;
if (!Cache.empty()) {
// If we already have a partially computed set of results, scan them to
// determine what is dirty, seeding our initial DirtyBlocks worklist.
// FIXME: In the "don't need to be updated" case, this is expensive, why not
// have a per-"cache" flag saying it is undirty?
for (DenseMap<BasicBlock*, DepResultTy>::iterator I = Cache.begin(),
E = Cache.end(); I != E; ++I)
if (I->second.getInt() == Dirty)
DirtyBlocks.push_back(I->first);
NumCacheNonLocal++;
//cerr << "CACHED CASE: " << DirtyBlocks.size() << " dirty: "
// << Cache.size() << " cached: " << *QueryInst;
} else {
// Seed DirtyBlocks with each of the preds of QueryInst's block.
BasicBlock *QueryBB = QueryInst->getParent();
DirtyBlocks.append(pred_begin(QueryBB), pred_end(QueryBB));
NumUncacheNonLocal++;
}
// Iterate while we still have blocks to update.
while (!DirtyBlocks.empty()) {
BasicBlock *DirtyBB = DirtyBlocks.back();
DirtyBlocks.pop_back();
// Get the entry for this block. Note that this relies on DepResultTy
// default initializing to Dirty.
DepResultTy &DirtyBBEntry = Cache[DirtyBB];
// If DirtyBBEntry isn't dirty, it ended up on the worklist multiple times.
if (DirtyBBEntry.getInt() != Dirty) continue;
// Find out if this block has a local dependency for QueryInst.
// FIXME: Don't convert back and forth for MemDepResult <-> DepResultTy.
// If the dirty entry has a pointer, start scanning from it so we don't have
// to rescan the entire block.
BasicBlock::iterator ScanPos = DirtyBB->end();
if (Instruction *Inst = DirtyBBEntry.getPointer())
ScanPos = Inst;
DirtyBBEntry = ConvFromResult(getDependencyFrom(QueryInst, ScanPos,
DirtyBB));
// If the block has a dependency (i.e. it isn't completely transparent to
// the value), remember it!
if (DirtyBBEntry.getInt() != NonLocal) {
// Keep the ReverseNonLocalDeps map up to date so we can efficiently
// update this when we remove instructions.
if (Instruction *Inst = DirtyBBEntry.getPointer())
ReverseNonLocalDeps[Inst].insert(QueryInst);
continue;
}
// If the block *is* completely transparent to the load, we need to check
// the predecessors of this block. Add them to our worklist.
DirtyBlocks.append(pred_begin(DirtyBB), pred_end(DirtyBB));
}
// Copy the result into the output set.
for (DenseMap<BasicBlock*, DepResultTy>::iterator I = Cache.begin(),
E = Cache.end(); I != E; ++I)
Result.push_back(std::make_pair(I->first, ConvToResult(I->second)));
}
/// getDependency - Return the instruction on which a memory operation
/// depends. The local parameter indicates if the query should only
/// evaluate dependencies within the same basic block.
@ -322,6 +232,95 @@ MemDepResult MemoryDependenceAnalysis::getDependency(Instruction *QueryInst) {
return Res;
}
/// getNonLocalDependency - Perform a full dependency query for the
/// specified instruction, returning the set of blocks that the value is
/// potentially live across. The returned set of results will include a
/// "NonLocal" result for all blocks where the value is live across.
///
/// This method assumes the instruction returns a "nonlocal" dependency
/// within its own block.
///
void MemoryDependenceAnalysis::
getNonLocalDependency(Instruction *QueryInst,
SmallVectorImpl<std::pair<BasicBlock*,
MemDepResult> > &Result) {
assert(getDependency(QueryInst).isNonLocal() &&
"getNonLocalDependency should only be used on insts with non-local deps!");
DenseMap<BasicBlock*, DepResultTy> &Cache = NonLocalDeps[QueryInst];
/// DirtyBlocks - This is the set of blocks that need to be recomputed. In
/// the cached case, this can happen due to instructions being deleted etc. In
/// the uncached case, this starts out as the set of predecessors we care
/// about.
SmallVector<BasicBlock*, 32> DirtyBlocks;
if (!Cache.empty()) {
// If we already have a partially computed set of results, scan them to
// determine what is dirty, seeding our initial DirtyBlocks worklist.
// FIXME: In the "don't need to be updated" case, this is expensive, why not
// have a per-"cache" flag saying it is undirty?
for (DenseMap<BasicBlock*, DepResultTy>::iterator I = Cache.begin(),
E = Cache.end(); I != E; ++I)
if (I->second.getInt() == Dirty)
DirtyBlocks.push_back(I->first);
NumCacheNonLocal++;
//cerr << "CACHED CASE: " << DirtyBlocks.size() << " dirty: "
// << Cache.size() << " cached: " << *QueryInst;
} else {
// Seed DirtyBlocks with each of the preds of QueryInst's block.
BasicBlock *QueryBB = QueryInst->getParent();
DirtyBlocks.append(pred_begin(QueryBB), pred_end(QueryBB));
NumUncacheNonLocal++;
}
// Iterate while we still have blocks to update.
while (!DirtyBlocks.empty()) {
BasicBlock *DirtyBB = DirtyBlocks.back();
DirtyBlocks.pop_back();
// Get the entry for this block. Note that this relies on DepResultTy
// default initializing to Dirty.
DepResultTy &DirtyBBEntry = Cache[DirtyBB];
// If DirtyBBEntry isn't dirty, it ended up on the worklist multiple times.
if (DirtyBBEntry.getInt() != Dirty) continue;
// Find out if this block has a local dependency for QueryInst.
// FIXME: Don't convert back and forth for MemDepResult <-> DepResultTy.
// If the dirty entry has a pointer, start scanning from it so we don't have
// to rescan the entire block.
BasicBlock::iterator ScanPos = DirtyBB->end();
if (Instruction *Inst = DirtyBBEntry.getPointer())
ScanPos = Inst;
DirtyBBEntry = ConvFromResult(getDependencyFrom(QueryInst, ScanPos,
DirtyBB));
// If the block has a dependency (i.e. it isn't completely transparent to
// the value), remember it!
if (DirtyBBEntry.getInt() != NonLocal) {
// Keep the ReverseNonLocalDeps map up to date so we can efficiently
// update this when we remove instructions.
if (Instruction *Inst = DirtyBBEntry.getPointer())
ReverseNonLocalDeps[Inst].insert(QueryInst);
continue;
}
// If the block *is* completely transparent to the load, we need to check
// the predecessors of this block. Add them to our worklist.
DirtyBlocks.append(pred_begin(DirtyBB), pred_end(DirtyBB));
}
// Copy the result into the output set.
for (DenseMap<BasicBlock*, DepResultTy>::iterator I = Cache.begin(),
E = Cache.end(); I != E; ++I)
Result.push_back(std::make_pair(I->first, ConvToResult(I->second)));
}
/// removeInstruction - Remove an instruction from the dependence analysis,
/// updating the dependence of instructions that previously depended on it.
/// This method attempts to keep the cache coherent using the reverse map.