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go/test/fixedbugs/issue36259.go
Keith Randall bc98e35b53 cmd/compile: avoid memmove -> SSA move rewrite when size is negative
We should panic in this situation. Rewriting to a SSA op just leads
to a compiler panic.

Fixes #36259

Change-Id: I6e0bccbed7dd0fdac7ebae76b98a211947947386
Reviewed-on: https://go-review.googlesource.com/c/go/+/212405
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
2020-02-24 20:23:14 +00:00

29 lines
483 B
Go

// compile
// Copyright 2019 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.
package main
func rotate(s []int, m int) {
l := len(s)
m = m % l
buf := make([]int, m)
copy(buf, s)
copy(s, s[m:])
copy(s[l-m:], buf)
}
func main() {
a0 := [...]int{1,2,3,4,5}
println(a0[0])
rotate(a0[:], 1)
println(a0[0])
rotate(a0[:], -3)
println(a0[0])
}