new testcase basicaa should handle

llvm-svn: 18260

1 files changed, 17 insertions, 0 deletions

diff --git a/llvm/test/Regression/Analysis/BasicAA/global-size.ll b/llvm/test/Regression/Analysis/BasicAA/global-size.ll
new file mode 100644
index 00000000000..52ea7bc7b0e
--- /dev/null
+++ b/llvm/test/Regression/Analysis/BasicAA/global-size.ll
@@ -0,0 +1,17 @@
+; A store or load cannot alias a global if the accessed amount is larger then
+; the global.
+
+; RUN: llvm-as < %s | opt -basicaa -load-vn -gcse -instcombine | llvm-dis | not grep load
+
+%B = global short 8
+
+implementation
+
+short %test(int *%P) {
+	%X = load short* %B
+	store int 7, int* %P
+	%Y = load short* %B
+	%Z = sub short %Y, %X
+	ret short %Z
+}
+