From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Wed, 28 Mar 2012 10:50:18 +0000 (+0000)
Subject: Add another note about a missed compare with nsw arithmetic instcombine.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9b58464330f45dcf6fe621a40f4bc8617169586e;p=oota-llvm.git

Add another note about a missed compare with nsw arithmetic instcombine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153574 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index 8929ac4f2a6..3c21ddae80c 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -973,6 +973,13 @@ optimized with "clang -emit-llvm-bc | opt -std-compile-opts".
 
 //===---------------------------------------------------------------------===//
 
+int f(int i, int j) { return i < j + 1; }
+int g(int i, int j) { return j > i - 1; }
+Should combine to "i <= j" (the add/sub has nsw).  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