6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-04 21:30:49 +00:00
Code Issues Projects Releases Wiki Activity

Check for terminating conditions before adding PHIs to the worklists.

Browse Source 
This is more efficient than adding them to the worklist and then ignoring them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100158 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2010-04-02 00:10:41 +00:00
parent 9c0012e738
commit ec54d6ab84
1 changed files with 29 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
lib/Transforms/Utils/SSAUpdater.cpp
View File

@ -471,22 +471,27 @@ void SSAUpdater::RecordMatchingPHI(PHINode *PHI) {
SmallVector<PHINode*, 20> WorkList;
WorkList.push_back(PHI);
// Record this PHI.
BasicBlock *BB = PHI->getParent();
AvailableVals[BB] = PHI;
(*BBMap)[BB]->AvailableVal = PHI;
while (!WorkList.empty()) {
PHI = WorkList.pop_back_val();
BasicBlock *BB = PHI->getParent();
BBInfo *Info = (*BBMap)[BB];
if (!Info || Info->AvailableVal)
return;
// Record the PHI.
AvailableVals[BB] = PHI;
Info->AvailableVal = PHI;
// Iterate through the PHI's incoming values.
for (unsigned i = 0, e = PHI->getNumIncomingValues(); i != e; ++i) {
PHINode *IncomingVal = dyn_cast<PHINode>(PHI->getIncomingValue(i));
if (!IncomingVal) continue;
WorkList.push_back(IncomingVal);
PHINode *IncomingPHIVal = dyn_cast<PHINode>(PHI->getIncomingValue(i));
if (!IncomingPHIVal) continue;
BB = IncomingPHIVal->getParent();
BBInfo *Info = (*BBMap)[BB];
if (!Info || Info->AvailableVal)
continue;
// Record the PHI and add it to the worklist.
AvailableVals[BB] = IncomingPHIVal;
Info->AvailableVal = IncomingPHIVal;
WorkList.push_back(IncomingPHIVal);
}
}
}
@ -499,21 +504,24 @@ void SSAUpdater::ClearPHITags(PHINode *PHI) {
SmallVector<PHINode*, 20> WorkList;
WorkList.push_back(PHI);
// Clear the tag for this PHI.
(*BBMap)[PHI->getParent()]->PHITag = 0;
while (!WorkList.empty()) {
PHI = WorkList.pop_back_val();
BasicBlock *BB = PHI->getParent();
BBInfo *Info = (*BBMap)[BB];
if (!Info || Info->AvailableVal || !Info->PHITag)
continue;
// Clear the tag.
Info->PHITag = 0;
// Iterate through the PHI's incoming values.
for (unsigned i = 0, e = PHI->getNumIncomingValues(); i != e; ++i) {
PHINode *IncomingVal = dyn_cast<PHINode>(PHI->getIncomingValue(i));
if (!IncomingVal) continue;
WorkList.push_back(IncomingVal);
PHINode *IncomingPHIVal = dyn_cast<PHINode>(PHI->getIncomingValue(i));
if (!IncomingPHIVal) continue;
BasicBlock *BB = IncomingPHIVal->getParent();
BBInfo *Info = (*BBMap)[BB];
if (!Info || Info->AvailableVal || !Info->PHITag)
continue;
// Clear the tag and add the PHI to the worklist.
Info->PHITag = 0;
WorkList.push_back(IncomingPHIVal);
}
}
}