From: Chris Lattner <sabre@nondot.org>
Date: Sat, 4 Mar 2006 08:44:51 +0000 (+0000)
Subject: Add a note
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ad01993194af59c68f8507528a09fee45cde8f24;p=oota-llvm.git

Add a note


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26523 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 2ce2575d1ca..cdadb26806c 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -101,3 +101,20 @@ into:
 
 This would be a win on ppc32, but not x86 or ppc64.
 
+//===---------------------------------------------------------------------===//
+
+Pull add through mul/shift to handle this:
+
+int foo(int P[4][4], int i) {
+  return P[i+2][1];
+}
+
+better than this (no addi needed):
+
+_foo:
+        addi r2, r4, 2
+        slwi r2, r2, 4
+        add r2, r3, r2
+        lwz r3, 4(r2)
+        blr
+