From: Chris Lattner <sabre@nondot.org>
Date: Tue, 21 Feb 2006 18:29:44 +0000 (+0000)
Subject: missed optzn
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=a1532bc283a1aeddf42b5145e6e7f131dbad6032;p=oota-llvm.git

missed optzn


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26299 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index a92ff28cc51..4affd7c0844 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -68,3 +68,14 @@ int %test(int %A) {
 This sort of thing occurs in the alloca lowering code and other places that
 are generating alignment of an already aligned value.
 
+//===---------------------------------------------------------------------===//
+
+Turn this into a signed shift right in instcombine:
+
+int f(unsigned x) {
+  return x >> 31 ? -1 : 0;
+}
+
+http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25600
+http://gcc.gnu.org/ml/gcc-patches/2006-02/msg01492.html
+