New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6969 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Analysis/DSGraph/mustalias.ll b/test/Analysis/DSGraph/mustalias.ll
new file mode 100644 (file)
index 0000000..349377c
--- /dev/null
+++ b/test/Analysis/DSGraph/mustalias.ll
@@ -0,0 +1,17 @@
+; Test that ds-aa is returning must-alias information when it can.
+
+; RUN: as < %s | opt -no-aa -ds-aa -load-vn -gcse | dis | not grep load
+
+%X = global int 20
+
+implementation
+
+int* %id(int* %P) { ret int* %P }
+
+int %main() {
+       store int 0, int* %X
+       %XP = call int* %id(int* %X)
+       %A = load int* %XP        ; Should eliminate load!
+       ret int %A
+}
+