From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Sat, 6 Nov 2010 10:37:16 +0000 (+0000)
Subject: Add a note.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=019e3787542139a72d0f068d404e2a4caace06e9;p=oota-llvm.git

Add a note.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118337 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/README.txt b/lib/Target/README.txt
index e63df536ae0..55c08173d20 100644
--- a/lib/Target/README.txt
+++ b/lib/Target/README.txt
@@ -1963,3 +1963,15 @@ bb3:            ; preds = %entry
         ret i32 %b
 }
 //===---------------------------------------------------------------------===//
+We should fold this code into "ret i1 false" since neither %zero nor %one can
+ever be null pointers.
+
+define i1 @foo(i1 %cond) {
+  %zero = alloca i32
+  %one = alloca i32
+
+  %ptr = select i1 %cond, i32* %zero, i32* %one
+  %isnull = icmp eq i32* %ptr, null
+  ret i1 %isnull
+}
+//===---------------------------------------------------------------------===//