libgo/go/runtime/closure_test.go

   1 // Copyright 2011 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4 package runtime_test
   5
   6 import "testing"
   7
   8 var s int
   9
  10 func BenchmarkCallClosure(b *testing.B) {
  11         for i := 0; i < b.N; i++ {
  12                 s += func(ii int) int { return 2 * ii }(i)
  13         }
  14 }
  15
  16 func BenchmarkCallClosure1(b *testing.B) {
  17         for i := 0; i < b.N; i++ {
  18                 j := i
  19                 s += func(ii int) int { return 2*ii + j }(i)
  20         }
  21 }
  22
  23 var ss *int
  24
  25 func BenchmarkCallClosure2(b *testing.B) {
  26         for i := 0; i < b.N; i++ {
  27                 j := i
  28                 s += func() int {
  29                         ss = &j
  30                         return 2
  31                 }()
  32         }
  33 }
  34
  35 func addr1(x int) *int {
  36         return func() *int { return &x }()
  37 }
  38
  39 func BenchmarkCallClosure3(b *testing.B) {
  40         for i := 0; i < b.N; i++ {
  41                 ss = addr1(i)
  42         }
  43 }
  44
  45 func addr2() (x int, p *int) {
  46         return 0, func() *int { return &x }()
  47 }
  48
  49 func BenchmarkCallClosure4(b *testing.B) {
  50         for i := 0; i < b.N; i++ {
  51                 _, ss = addr2()
  52         }
  53 }