RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-24 11:42:57 +01:00
Code Issues Projects Releases Wiki Activity

Fix DFS number calculation for postdominators

Browse Source 
The DFS number calculation for postdominators was broken. In the case of
multiple exits that form the post dominator root nodes, do not iterate over
all exits, but start from the virtual root node. Otherwise bbs, that are not
post dominated by any exit but by the virtual root node, will never be assigned
a DFS number.

llvm-svn: 92967
This commit is contained in:
Tobias Grosser 2010-01-07 23:50:06 +00:00
parent 944f9c4ac1
commit fbc9ea7841
1 changed files with 26 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/llvm/Analysis/Dominators.h
View File

@ -585,8 +585,15 @@ protected:
SmallVector<std::pair<DomTreeNodeBase<NodeT>*,
typename DomTreeNodeBase<NodeT>::iterator>, 32> WorkStack;
for (unsigned i = 0, e = (unsigned)this->Roots.size(); i != e; ++i) {
DomTreeNodeBase<NodeT> *ThisRoot = getNode(this->Roots[i]);
DomTreeNodeBase<NodeT> *ThisRoot = getRootNode();
if (!ThisRoot)
return;
// Even in the case of multiple exits that form the post dominator root
// nodes, do not iterate over all exits, but start from the virtual root
// node. Otherwise bbs, that are not post dominated by any exit but by the
// virtual root node, will never be assigned a DFS number.
WorkStack.push_back(std::make_pair(ThisRoot, ThisRoot->begin()));
ThisRoot->DFSNumIn = DFSNum++;
@ -609,7 +616,6 @@ protected:
Child->DFSNumIn = DFSNum++;
}
}
}
SlowQueries = 0;
DFSInfoValid = true;