1 files changed, 77 insertions, 0 deletions
diff --git a/llvm/test/Analysis/MemorySSA/many-dom-backedge.ll b/llvm/test/Analysis/MemorySSA/many-dom-backedge.ll
new file mode 100644
index 00000000000..c2216a47bb2
--- /dev/null
+++ b/llvm/test/Analysis/MemorySSA/many-dom-backedge.ll
@@ -0,0 +1,77 @@
+; 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
+;
+; many-dom.ll, with an added back-edge back into the switch.
+; Because people love their gotos.
+
+declare i1 @getBool() readnone
+
+define i32 @foo(i32* %p) {
+entry:
+  br label %loopbegin
+
+loopbegin:
+; CHECK: 8 = MemoryPhi({entry,liveOnEntry},{sw.epilog,6})
+; CHECK-NEXT: %n =
+  %n = phi i32 [ 0, %entry ], [ %1, %sw.epilog ]
+  %m = alloca i32, align 4
+  switch i32 %n, label %sw.default [
+    i32 0, label %sw.bb
+    i32 1, label %sw.bb1
+    i32 2, label %sw.bb2
+    i32 3, label %sw.bb3
+  ]
+
+sw.bb:
+; CHECK: 1 = MemoryDef(8)
+; CHECK-NEXT: store i32 1
+  store i32 1, i32* %m, align 4
+  br label %sw.epilog
+
+sw.bb1:
+; CHECK: 2 = MemoryDef(8)
+; CHECK-NEXT: store i32 2
+  store i32 2, i32* %m, align 4
+  br label %sw.epilog
+
+sw.bb2:
+; CHECK: 3 = MemoryDef(8)
+; CHECK-NEXT: store i32 3
+  store i32 3, i32* %m, align 4
+  br label %sw.epilog
+
+sw.bb3:
+; CHECK: 9 = MemoryPhi({loopbegin,8},{sw.almostexit,6})
+; CHECK: 4 = MemoryDef(9)
+; CHECK-NEXT: store i32 4
+  store i32 4, i32* %m, align 4
+  br label %sw.epilog
+
+sw.default:
+; CHECK: 5 = MemoryDef(8)
+; CHECK-NEXT: store i32 5
+  store i32 5, i32* %m, align 4
+  br label %sw.epilog
+
+sw.epilog:
+; CHECK: 10 = MemoryPhi({sw.default,5},{sw.bb3,4},{sw.bb,1},{sw.bb1,2},{sw.bb2,3})
+; CHECK-NEXT: MemoryUse(10)
+; CHECK-NEXT: %0 =
+  %0 = load i32, i32* %m, align 4
+; CHECK: 6 = MemoryDef(10)
+; CHECK-NEXT: %1 =
+  %1 = load volatile i32, i32* %p, align 4
+  %2 = icmp eq i32 %0, %1
+  br i1 %2, label %sw.almostexit, label %loopbegin
+
+sw.almostexit:
+  %3 = icmp eq i32 0, %1
+  br i1 %3, label %exit, label %sw.bb3
+
+exit:
+; CHECK: 7 = MemoryDef(6)
+; CHECK-NEXT: %4 = load volatile i32
+  %4 = load volatile i32, i32* %p, align 4
+  %5 = add i32 %4, %1
+  ret i32 %5
+}