1 files changed, 41 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/copyelim_test.go b/src/cmd/compile/internal/ssa/copyelim_test.go
new file mode 100644
index 0000000..fe31b12
--- /dev/null
+++ b/src/cmd/compile/internal/ssa/copyelim_test.go
@@ -0,0 +1,41 @@
+// Copyright 2016 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 (
+	"cmd/compile/internal/types"
+	"fmt"
+	"testing"
+)
+
+func BenchmarkCopyElim1(b *testing.B)      { benchmarkCopyElim(b, 1) }
+func BenchmarkCopyElim10(b *testing.B)     { benchmarkCopyElim(b, 10) }
+func BenchmarkCopyElim100(b *testing.B)    { benchmarkCopyElim(b, 100) }
+func BenchmarkCopyElim1000(b *testing.B)   { benchmarkCopyElim(b, 1000) }
+func BenchmarkCopyElim10000(b *testing.B)  { benchmarkCopyElim(b, 10000) }
+func BenchmarkCopyElim100000(b *testing.B) { benchmarkCopyElim(b, 100000) }
+
+func benchmarkCopyElim(b *testing.B, n int) {
+	c := testConfig(b)
+
+	values := make([]interface{}, 0, n+2)
+	values = append(values, Valu("mem", OpInitMem, types.TypeMem, 0, nil))
+	last := "mem"
+	for i := 0; i < n; i++ {
+		name := fmt.Sprintf("copy%d", i)
+		values = append(values, Valu(name, OpCopy, types.TypeMem, 0, nil, last))
+		last = name
+	}
+	values = append(values, Exit(last))
+	// Reverse values array to make it hard
+	for i := 0; i < len(values)/2; i++ {
+		values[i], values[len(values)-1-i] = values[len(values)-1-i], values[i]
+	}
+
+	for i := 0; i < b.N; i++ {
+		fun := c.Fun("entry", Bloc("entry", values...))
+		Copyelim(fun.f)
+	}
+}