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. 6 package main 7 8 import "fmt" 9 10 var failed = false 11 12 //go:noinline 13 func appendOne_ssa(a []int, x int) []int { 14 return append(a, x) 15 } 16 17 //go:noinline 18 func appendThree_ssa(a []int, x, y, z int) []int { 19 return append(a, x, y, z) 20 } 21 22 func eq(a, b []int) bool { 23 if len(a) != len(b) { 24 return false 25 } 26 for i := range a { 27 if a[i] != b[i] { 28 return false 29 } 30 } 31 return true 32 } 33 34 func expect(got, want []int) { 35 if eq(got, want) { 36 return 37 } 38 fmt.Printf("expected %v, got %v\n", want, got) 39 failed = true 40 } 41 42 func testAppend() { 43 var store [7]int 44 a := store[:0] 45 46 a = appendOne_ssa(a, 1) 47 expect(a, []int{1}) 48 a = appendThree_ssa(a, 2, 3, 4) 49 expect(a, []int{1, 2, 3, 4}) 50 a = appendThree_ssa(a, 5, 6, 7) 51 expect(a, []int{1, 2, 3, 4, 5, 6, 7}) 52 if &a[0] != &store[0] { 53 fmt.Println("unnecessary grow") 54 failed = true 55 } 56 a = appendOne_ssa(a, 8) 57 expect(a, []int{1, 2, 3, 4, 5, 6, 7, 8}) 58 if &a[0] == &store[0] { 59 fmt.Println("didn't grow") 60 failed = true 61 } 62 } 63 64 func main() { 65 testAppend() 66 67 if failed { 68 panic("failed") 69 } 70 } 71
