New entry.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48908 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/README.txt b/lib/CodeGen/README.txt
index 33e207ff8c8c3f16015901d2d26940ebb208f295..f7975fea6d190f6f013c10ffe8a66a4854ef571e 100644 (file)
--- a/lib/CodeGen/README.txt
+++ b/lib/CodeGen/README.txt
@@ -199,3 +199,5 @@ effects).  Once this is in place, it would be even better to have tblgen
 synthesize the various copy insertion/inspection methods in TargetInstrInfo.
 
 //===---------------------------------------------------------------------===//
+
+Avoid issuing copies of TargetInstrInfo::implicit_def.