Author: resistor
Date: Sat Dec 15 22:07:23 2007
New Revision: 45069
URL: http://llvm.org/viewvc/llvm-project?rev=45069&view=rev
Log:
A few more comments.
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=45069&r1=45068&r2=45069&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp (original)
+++ llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp Sat Dec 15 22:07:23 2007
@@ -311,6 +311,10 @@
}
}
+/// processPHIUnion - Take a set of candidate registers to be coallesced when
+/// decomposing the PHI instruction. Use the DominanceForest to remove the
ones
+/// that are known to interfere, and flag others that need to be checked for
+/// local interferences.
void StrongPHIElimination::processPHIUnion(MachineInstr* Inst,
std::set<unsigned>& PHIUnion,
std::vector<StrongPHIElimination::DomForestNode*>& DF,
@@ -322,6 +326,7 @@
LiveVariables& LV = getAnalysis<LiveVariables>();
unsigned DestReg = Inst->getOperand(0).getReg();
+ // DF walk on the DomForest
while (!worklist.empty()) {
DomForestNode* DFNode = worklist.back();
@@ -350,7 +355,7 @@
// Add (p, c) to possible local interferences
locals.push_back(std::make_pair(DFNode->getReg(), child->getReg()));
}
-
+
if (!visited.count(child)) {
worklist.push_back(child);
inserted = true;
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