go/test/codegen/issue56440.go

// 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
}