new testcase basicaa should handle

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18260 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Analysis/BasicAA/global-size.ll b/test/Analysis/BasicAA/global-size.ll
new file mode 100644 (file)
index 0000000..52ea7bc
--- /dev/null
+++ b/test/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
+}
+