RPCS3/llvm
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm.git synced 2025-01-31 15:53:42 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Fix a performance problem with the new SSAUpdater. This showed up in the

Browse Source 
GCCAS time for MultiSource/Benchmarks/ASCI_Purple/SMG2000.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102009 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2010-04-21 18:39:03 +00:00
parent c048f1d12c
commit b913863a95
1 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
lib/Transforms/Utils/SSAUpdater.cpp
View File

@ -529,9 +529,15 @@ void SSAUpdater::FindAvailableVals(BlockListTy *BlockList) {
E = BlockList->rend(); I != E; ++I) { E = BlockList->rend(); I != E; ++I) {
BBInfo *Info = *I; BBInfo *Info = *I;
// Check if this block contains a newly added PHI. if (Info->DefBB != Info) {
if (Info->DefBB != Info) // Record the available value at join nodes to speed up subsequent
// uses of this SSAUpdater for the same value.
if (Info->NumPreds > 1)
AvailableVals[Info->BB] = Info->DefBB->AvailableVal;
continue; continue;
}
// Check if this block contains a newly added PHI.
PHINode *PHI = dyn_cast<PHINode>(Info->AvailableVal); PHINode *PHI = dyn_cast<PHINode>(Info->AvailableVal);
if (!PHI || PHI->getNumIncomingValues() == Info->NumPreds) if (!PHI || PHI->getNumIncomingValues() == Info->NumPreds)
continue; continue;