mirror of
https://github.com/golang/go
synced 2024-09-04 23:44:16 +00:00
5c5552c5ba
Change-Id: I4b2b62a8eb1c4bf47f552214127d4ed5710af196 Reviewed-on: https://go-review.googlesource.com/c/go/+/297030 Trust: David Chase <drchase@google.com> Run-TryBot: David Chase <drchase@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com>
83 lines
1.5 KiB
Go
83 lines
1.5 KiB
Go
// run
|
|
|
|
//go:build !wasm
|
|
// +build !wasm
|
|
|
|
// Copyright 2021 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.
|
|
|
|
// wasm is excluded because the compiler chatter about register abi pragma ends up
|
|
// on stdout, and causes the expected output to not match.
|
|
|
|
package main
|
|
|
|
import "fmt"
|
|
|
|
// This test is designed to provoke a stack growth
|
|
// in a way that very likely leaves junk in the
|
|
// parameter save area if they aren't saved or spilled
|
|
// there, as appropriate.
|
|
|
|
//go:registerparams
|
|
//go:noinline
|
|
func f(x int, xm1, xm2, p *int) {
|
|
var y = [2]int{x - 4, 0}
|
|
if x < 2 {
|
|
*p += x
|
|
return
|
|
}
|
|
x -= 3
|
|
g(*xm1, xm2, &x, p) // xm1 is no longer live.
|
|
h(*xm2, &x, &y[0], p) // xm2 is no longer live, but was spilled.
|
|
}
|
|
|
|
//go:registerparams
|
|
//go:noinline
|
|
func g(x int, xm1, xm2, p *int) {
|
|
var y = [3]int{x - 4, 0, 0}
|
|
if x < 2 {
|
|
*p += x
|
|
return
|
|
}
|
|
x -= 3
|
|
k(*xm2, &x, &y[0], p)
|
|
h(*xm1, xm2, &x, p)
|
|
}
|
|
|
|
//go:registerparams
|
|
//go:noinline
|
|
func h(x int, xm1, xm2, p *int) {
|
|
var y = [4]int{x - 4, 0, 0, 0}
|
|
if x < 2 {
|
|
*p += x
|
|
return
|
|
}
|
|
x -= 3
|
|
k(*xm1, xm2, &x, p)
|
|
f(*xm2, &x, &y[0], p)
|
|
}
|
|
|
|
//go:registerparams
|
|
//go:noinline
|
|
func k(x int, xm1, xm2, p *int) {
|
|
var y = [5]int{x - 4, 0, 0, 0, 0}
|
|
if x < 2 {
|
|
*p += x
|
|
return
|
|
}
|
|
x -= 3
|
|
f(*xm2, &x, &y[0], p)
|
|
g(*xm1, xm2, &x, p)
|
|
}
|
|
|
|
func main() {
|
|
x := 40
|
|
var y int
|
|
xm1 := x - 1
|
|
xm2 := x - 2
|
|
f(x, &xm1, &xm2, &y)
|
|
|
|
fmt.Printf("Fib(%d)=%d\n", x, y)
|
|
}
|