From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 18 Jul 2007 23:34:48 +0000 (+0000)
Subject: Add comment.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=273288c888027c64a0c0ba25a58fbf1f871b5311;p=oota-llvm.git

Add comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40022 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 3d8618f6c4c..b714bac86a1 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -369,6 +369,9 @@ bool SimpleRegisterCoalescing::JoinCopy(MachineInstr *CopyMI,
   // If the intervals were swapped by Join, swap them back so that the register
   // mapping (in the r2i map) is correct.
   if (Swapped) SrcInt.swap(DstInt);
+
+  // repSrcReg is guarateed to be the register whose live interval that is
+  // being merged.
   li_->removeInterval(repSrcReg);
   r2rMap_[repSrcReg] = repDstReg;