1 files changed, 54 insertions, 0 deletions
diff --git a/llvm/test/Analysis/MemorySSA/function-clobber.ll b/llvm/test/Analysis/MemorySSA/function-clobber.ll
new file mode 100644
index 00000000000..a01893a5b95
--- /dev/null
+++ b/llvm/test/Analysis/MemorySSA/function-clobber.ll
@@ -0,0 +1,54 @@
+; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
+; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
+;
+; Ensuring that external functions without attributes are MemoryDefs
+
+@g = external global i32
+declare void @modifyG()
+
+define i32 @foo() {
+; CHECK: MemoryUse(liveOnEntry)
+; CHECK-NEXT: %1 = load i32
+  %1 = load i32, i32* @g
+
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: store i32 4
+  store i32 4, i32* @g, align 4
+
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: call void @modifyG()
+  call void @modifyG()
+
+; CHECK: MemoryUse(2)
+; CHECK-NEXT: %2 = load i32
+  %2 = load i32, i32* @g
+  %3 = add i32 %2, %1
+  ret i32 %3
+}
+
+declare void @readEverything() readonly
+declare void @clobberEverything()
+
+; CHECK-LABEL: define void @bar
+define void @bar() {
+; CHECK: 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT: call void @clobberEverything()
+  call void @clobberEverything()
+  br i1 undef, label %if.end, label %if.then
+
+if.then:
+; CHECK: MemoryUse(1)
+; CHECK-NEXT: call void @readEverything()
+  call void @readEverything()
+; CHECK: 2 = MemoryDef(1)
+; CHECK-NEXT: call void @clobberEverything()
+  call void @clobberEverything()
+  br label %if.end
+
+if.end:
+; CHECK: 3 = MemoryPhi({%0,1},{if.then,2})
+; CHECK: MemoryUse(3)
+; CHECK-NEXT: call void @readEverything()
+  call void @readEverything()
+  ret void
+}