From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Sat, 23 Jun 2012 15:19:31 +0000 (+0000)
Subject: Add a microoptimization note.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d52998a8155e2c45d131e2dbfb97c3fdcbb57435;p=oota-llvm.git

Add a microoptimization note.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159082 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 093255e6af2..cbfa4cf35ba 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -964,6 +964,12 @@ optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
 
 //===---------------------------------------------------------------------===//
 
+unsigned f(unsigned x) { return ((x & 7) + 1) & 15; }
+The & 15 part should be optimized away, it doesn't change the result. Currently
+not optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
+
+//===---------------------------------------------------------------------===//
+
 This was noticed in the entryblock for grokdeclarator in 403.gcc:
 
         %tmp = icmp eq i32 %decl_context, 4