Author: resistor
Date: Mon Jan 21 16:01:01 2008
New Revision: 46217
URL: http://llvm.org/viewvc/llvm-project?rev=46217&view=rev
Log:
Improve a few 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=46217&r1=46216&r2=46217&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp (original)
+++ llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp Mon Jan 21 16:01:01 2008
@@ -550,7 +550,9 @@
for (DomForestNode::iterator CI = DFNode->begin(), CE = DFNode->end();
CI != CE; ++CI) {
DomForestNode* child = *CI;
-
+
+ // If the current node is live-out of the defining block of one of its
+ // children, insert a copy for it
if (isLiveOut(DFNode->getReg(),
MRI.getVRegDef(child->getReg())->getParent(), MRI, LV)) {
// Insert copies for parent
@@ -565,6 +567,9 @@
PHIUnion.erase(SrcReg);
}
}
+
+ // If a node is live-in to the defining block of one of its children, but
+ // not live-out, then we need to scan that block for local interferences.
} else if (isLiveIn(DFNode->getReg(),
MRI.getVRegDef(child->getReg())->getParent(),
MRI, LV) ||
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