From 4670e526ba94f58488d7163a1784004cb35ee79d Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 10 Apr 2008 08:03:14 +0000
Subject: Add comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49469 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SimpleRegisterCoalescing.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib')

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h
index 7823ba0..fa63159 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.h
+++ b/lib/CodeGen/SimpleRegisterCoalescing.h
@@ -223,6 +223,8 @@ namespace llvm {
     /// subregister.
     void UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg, unsigned SubIdx);
 
+    /// RemoveDeadImpDef - Remove implicit_def instructions which are
+    /// "re-defining" registers due to insert_subreg coalescing. e.g.
     void RemoveDeadImpDef(unsigned Reg, LiveInterval &LI);
 
     /// RemoveUnnecessaryKills - Remove kill markers that are no longer accurate
-- 
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