[llvm-commits] [llvm] r118337 - /llvm/trunk/lib/Target/README.txt

[Benjamin Kramer]

Author: d0k
Date: Sat Nov  6 05:37:16 2010
New Revision: 118337

URL: http://llvm.org/viewvc/llvm-project?rev=118337&view=rev
Log:
Add a note.

Modified:
    llvm/trunk/lib/Target/README.txt

Modified: llvm/trunk/lib/Target/README.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/README.txt?rev=118337&r1=118336&r2=118337&view=diff
==============================================================================
--- llvm/trunk/lib/Target/README.txt (original)
+++ llvm/trunk/lib/Target/README.txt Sat Nov  6 05:37:16 2010
@@ -1963,3 +1963,15 @@
         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
+}
+//===---------------------------------------------------------------------===//