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changeset 11804:60f6d5939941

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LoweringPhase: add comment
author Bernhard Urban <bernhard.urban@jku.at>
date Thu, 26 Sep 2013 08:50:55 +0200
parents eb2def6529bc
children 73a886a9564a
files graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/LoweringPhase.java
diffstat 1 files changed, 4 insertions(+), 0 deletions(-) [+]
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line diff
--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/LoweringPhase.java	Wed Sep 25 17:07:33 2013 +0200
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/LoweringPhase.java	Thu Sep 26 08:50:55 2013 +0200
@@ -278,6 +278,10 @@
                     Node nextLastFixed = nextNode.predecessor();
                     if (!(nextLastFixed instanceof FixedWithNextNode)) {
                         // insert begin node, to have a valid last fixed for next lowerable node.
+                        // This is about lowering a FixedWithNextNode to a control split while this
+                        // FixedWithNextNode is followed by some kind of BeginNode.
+                        // For example the when a FixedGuard followed by a loop exit is lowered to a
+                        // control-split + deopt.
                         BeginNode begin = node.graph().add(new BeginNode());
                         nextLastFixed.replaceFirstSuccessor(nextNode, begin);
                         begin.setNext(nextNode);