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authorEvan Cheng <evan.cheng@apple.com>2008-04-10 08:03:14 +0000
committerEvan Cheng <evan.cheng@apple.com>2008-04-10 08:03:14 +0000
commitf0785153e51a60ede0a85bf98c1c1e6ada9054f6 (patch)
tree9b04c0eef1a9934592a967ef6fe16e47786b0c6f
parent2189c1744398958407f6802cd07177a292cc1416 (diff)
Add comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49469 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r--lib/CodeGen/SimpleRegisterCoalescing.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h
index 7823ba0df4..fa63159d1c 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