add a note

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26950 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 2dd46d29cabe1c78da3c05b0662939991c32b743..c2635dade4181062bd96f3476b220837dbc71afd 100644 (file)
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -128,3 +128,13 @@ Can be improved in two ways:
 //===---------------------------------------------------------------------===//
 
 Add LSR exit value substitution. It'll probably be a win for Ackermann, etc.
+
+//===---------------------------------------------------------------------===//
+
+It would be nice to revert this patch:
+http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20060213/031986.html
+
+And teach the dag combiner enough to simplify the code expanded before 
+legalize.  It seems plausible that this knowledge would let it simplify other
+stuff too.
+