Add a test for MemorySSA. NFC.

We don't currently have many tests that deal with operations on multiple
local MemoryLocations. This new test helps out a bit in that regard.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259854 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/Util/MemorySSA/multiple-locations.ll b/test/Transforms/Util/MemorySSA/multiple-locations.ll
new file mode 100644 (file)
index 0000000..f4fe1d1
--- /dev/null
+++ b/test/Transforms/Util/MemorySSA/multiple-locations.ll
@@ -0,0 +1,24 @@
+; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
+;
+; Checks that basicAA is doing some amount of disambiguation for us
+
+define i32 @foo(i1 %cond) {
+  %a = alloca i32, align 4
+  %b = alloca i32, align 4
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: store i32 0
+  store i32 0, i32* %a, align 4
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: store i32 1
+  store i32 1, i32* %b, align 4
+
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: %1 = load i32
+  %1 = load i32, i32* %a, align 4
+; CHECK: MemoryUse(2)
+; CHECK-NEXT: %2 = load i32
+  %2 = load i32, i32* %b, align 4
+
+  %3 = add i32 %1, %2
+  ret i32 %3
+}