[llvm-commits] [llvm] r45774 - /llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp
Owen Anderson
resistor at mac.com
Wed Jan 9 02:32:36 PST 2008
Author: resistor
Date: Wed Jan 9 04:32:30 2008
New Revision: 45774
URL: http://llvm.org/viewvc/llvm-project?rev=45774&view=rev
Log:
Fix an infinite recursion bug in InsertCopies.
Modified:
llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp
Modified: llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp?rev=45774&r1=45773&r2=45774&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp (original)
+++ llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp Wed Jan 9 04:32:30 2008
@@ -101,7 +101,7 @@
std::vector<StrongPHIElimination::DomForestNode*>& DF,
std::vector<std::pair<unsigned, unsigned> >& locals);
void ScheduleCopies(MachineBasicBlock* MBB, std::set<unsigned>& pushed);
- void InsertCopies(MachineBasicBlock* MBB);
+ void InsertCopies(MachineBasicBlock* MBB, std::set<MachineBasicBlock*>& v);
};
char StrongPHIElimination::ID = 0;
@@ -610,7 +610,10 @@
}
/// InsertCopies - insert copies into MBB and all of its successors
-void StrongPHIElimination::InsertCopies(MachineBasicBlock* MBB) {
+void StrongPHIElimination::InsertCopies(MachineBasicBlock* MBB,
+ std::set<MachineBasicBlock*>& visited) {
+ visited.insert(MBB);
+
std::set<unsigned> pushed;
// Rewrite register uses from Stacks
@@ -629,7 +632,8 @@
for (GraphTraits<MachineBasicBlock*>::ChildIteratorType I =
GraphTraits<MachineBasicBlock*>::child_begin(MBB), E =
GraphTraits<MachineBasicBlock*>::child_end(MBB); I != E; ++I)
- InsertCopies(*I);
+ if (!visited.count(*I))
+ InsertCopies(*I, visited);
// As we exit this block, pop the names we pushed while processing it
for (std::set<unsigned>::iterator I = pushed.begin(),
@@ -649,7 +653,8 @@
// Insert copies
// FIXME: This process should probably preserve LiveVariables
- InsertCopies(Fn.begin());
+ std::set<MachineBasicBlock*> visited;
+ InsertCopies(Fn.begin(), visited);
// Perform renaming
typedef std::map<unsigned, std::set<unsigned> > RenameSetType;
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