| // 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 codegen | |
| func f(x []int) int { | |
| s := make([]int, 3) | |
| s = append(s, 4, 5) | |
| // amd64:`MOVQ 40\(.*\),` | |
| 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 40\(.*\),` | |
| return x[len(s)] | |
| } | |
| } | |
| return 0 | |
| } | |