1 files changed, 57 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/schedule_test.go b/src/cmd/compile/internal/ssa/schedule_test.go
new file mode 100644
index 0000000000..0ff57e3689
--- /dev/null
+++ b/src/cmd/compile/internal/ssa/schedule_test.go
@@ -0,0 +1,57 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ssa
+
+import "testing"
+
+func TestSchedule(t *testing.T) {
+	c := testConfig(t)
+	cases := []fun{
+		Fun(c, "entry",
+			Bloc("entry",
+				Valu("mem0", OpInitMem, TypeMem, 0, nil),
+				Valu("ptr", OpConst64, TypeInt64, 0xABCD, nil),
+				Valu("v", OpConst64, TypeInt64, 12, nil),
+				Valu("mem1", OpStore, TypeMem, 8, nil, "ptr", "v", "mem0"),
+				Valu("mem2", OpStore, TypeMem, 8, nil, "ptr", "v", "mem1"),
+				Valu("mem3", OpStore, TypeInt64, 8, nil, "ptr", "sum", "mem2"),
+				Valu("l1", OpLoad, TypeInt64, 0, nil, "ptr", "mem1"),
+				Valu("l2", OpLoad, TypeInt64, 0, nil, "ptr", "mem2"),
+				Valu("sum", OpAdd64, TypeInt64, 0, nil, "l1", "l2"),
+				Goto("exit")),
+			Bloc("exit",
+				Exit("mem3"))),
+	}
+	for _, c := range cases {
+		schedule(c.f)
+		if !isSingleLiveMem(c.f) {
+			t.Error("single-live-mem restriction not enforced by schedule for func:")
+			printFunc(c.f)
+		}
+	}
+}
+
+func isSingleLiveMem(f *Func) bool {
+	for _, b := range f.Blocks {
+		var liveMem *Value
+		for _, v := range b.Values {
+			for _, w := range v.Args {
+				if w.Type.IsMemory() {
+					if liveMem == nil {
+						liveMem = w
+						continue
+					}
+					if w != liveMem {
+						return false
+					}
+				}
+			}
+			if v.Type.IsMemory() {
+				liveMem = v
+			}
+		}
+	}
+	return true
+}