Update comments to reflect some (not so) recent changes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139498 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SplitKit.h b/lib/CodeGen/SplitKit.h
index 89ce24b..becd22c 100644
--- a/lib/CodeGen/SplitKit.h
+++ b/lib/CodeGen/SplitKit.h
@@ -255,7 +255,7 @@
// live-out value and its defining block.
// One of these conditions shall be true:
//
- // 1. !LiveOutCache.count(MBB)
+ // 1. !LiveOutSeen.count(MBB->getNumber())
// 2. LiveOutCache[MBB].second.getNode() == MBB
// 3. forall P in preds(MBB): LiveOutCache[P] == LiveOutCache[MBB]
//
@@ -264,12 +264,13 @@
// VNI = Edit.get(RegIdx)->getVNInfoAt(LIS.getMBBEndIdx(MBB))
// Node = mbt_[LIS.getMBBFromIndex(VNI->def)]
//
- // The cache is also used as a visited set by extendRange(). It can be shared
- // by all the new registers because at most one is live out of each block.
+ // The cache can be shared by all the new registers because at most one is
+ // live out of each block.
LiveOutMap LiveOutCache;
// LiveOutSeen - Indexed by MBB->getNumber(), a bit is set for each valid
- // entry in LiveOutCache.
+ // entry in LiveOutCache. This is also used as a visited set for
+ // findReachingDefs().
BitVector LiveOutSeen;
/// LiveInBlock - Info for updateSSA() about a block where a register is