add a note

llvm-svn: 26708

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/README.txt b/llvm/lib/Target/README.txt
index d92f9c99062..f77fbc2eea7 100644
--- a/llvm/lib/Target/README.txt
+++ b/llvm/lib/Target/README.txt
@@ -117,6 +117,10 @@ it needs to turn the shifts into multiplies to get it.
 
 //===---------------------------------------------------------------------===//
 
+Reassociate should turn: X*X*X*X -> t=(X*X) (t*t) to eliminate a multiply.
+
+//===---------------------------------------------------------------------===//
+
 These two functions should generate the same code on big-endian systems:
 
 int g(int *j,int *l)  {  return memcmp(j,l,4);  }