| // asmcheck |
| |
| // Copyright 2022 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. |
| |
| // Check to make sure that we recognize when the length of an append |
| // is constant. We check this by making sure that the constant length |
| // is folded into a load offset. |
| |
| package p |
| |
| func f(x []int) int { |
| s := make([]int, 3) |
| s = append(s, 4, 5) |
| // amd64:`MOVQ\t40\(.*\),` |
| return x[len(s)] |
| } |
| |
| func g(x []int, p *bool) int { |
| s := make([]int, 3) |
| for { |
| s = s[:3] |
| if cap(s) < 5 { |
| s = make([]int, 3, 5) |
| } |
| s = append(s, 4, 5) |
| if *p { |
| // amd64:`MOVQ\t40\(.*\),` |
| return x[len(s)] |
| } |
| } |
| return 0 |
| } |
