1 files changed, 30 insertions, 6 deletions
diff --git a/test/Analysis/BasicAA/global-size.ll b/test/Analysis/BasicAA/global-size.ll
index b9cbbcc..a7e5aab 100644
--- a/test/Analysis/BasicAA/global-size.ll
+++ b/test/Analysis/BasicAA/global-size.ll
@@ -1,16 +1,40 @@
 ; A store or load cannot alias a global if the accessed amount is larger then
 ; the global.
 
-; RUN: opt < %s -basicaa -gvn -instcombine -S | not grep load
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
 target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
 
-@B = global i16 8               ; <i16*> [#uses=2]
+@B = global i16 8
 
-define i16 @test(i32* %P) {
-        %X = load i16* @B               ; <i16> [#uses=1]
+; CHECK: @test1
+define i16 @test1(i32* %P) {
+        %X = load i16* @B
         store i32 7, i32* %P
-        %Y = load i16* @B               ; <i16> [#uses=1]
-        %Z = sub i16 %Y, %X             ; <i16> [#uses=1]
+        %Y = load i16* @B
+        %Z = sub i16 %Y, %X
         ret i16 %Z
+; CHECK: ret i16 0
+}
+
+; Cannot know anything about the size of this global.
+; rdar://8813415
+@window = external global [0 x i8]
+
+; CHECK: @test2
+define i8 @test2(i32 %tmp79, i32 %w.2, i32 %indvar89) nounwind {
+  %tmp92 = add i32 %tmp79, %indvar89
+  %arrayidx412 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp92
+  %tmp93 = add i32 %w.2, %indvar89
+  %arrayidx416 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp93
+
+  %A = load i8* %arrayidx412, align 1
+  store i8 4, i8* %arrayidx416, align 1
+
+  %B = load i8* %arrayidx412, align 1
+  %C = sub i8 %A, %B
+  ret i8 %C
+
+; CHECK: %B = load i8
+; CHECK: ret i8 %C
 }