1// Copyright 2015 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 5// append_ssa.go tests append operations. 6package main 7 8import "testing" 9 10//go:noinline 11func appendOne_ssa(a []int, x int) []int { 12 return append(a, x) 13} 14 15//go:noinline 16func appendThree_ssa(a []int, x, y, z int) []int { 17 return append(a, x, y, z) 18} 19 20func eqBytes(a, b []int) bool { 21 if len(a) != len(b) { 22 return false 23 } 24 for i := range a { 25 if a[i] != b[i] { 26 return false 27 } 28 } 29 return true 30} 31 32func expect(t *testing.T, got, want []int) { 33 if eqBytes(got, want) { 34 return 35 } 36 t.Errorf("expected %v, got %v\n", want, got) 37} 38 39func testAppend(t *testing.T) { 40 var store [7]int 41 a := store[:0] 42 43 a = appendOne_ssa(a, 1) 44 expect(t, a, []int{1}) 45 a = appendThree_ssa(a, 2, 3, 4) 46 expect(t, a, []int{1, 2, 3, 4}) 47 a = appendThree_ssa(a, 5, 6, 7) 48 expect(t, a, []int{1, 2, 3, 4, 5, 6, 7}) 49 if &a[0] != &store[0] { 50 t.Errorf("unnecessary grow") 51 } 52 a = appendOne_ssa(a, 8) 53 expect(t, a, []int{1, 2, 3, 4, 5, 6, 7, 8}) 54 if &a[0] == &store[0] { 55 t.Errorf("didn't grow") 56 } 57} 58 59func TestAppend(t *testing.T) { 60 testAppend(t) 61} 62