mirror of
https://github.com/golang/go
synced 2024-11-26 17:46:57 -07:00
23 lines
583 B
Go
23 lines
583 B
Go
|
// compile
|
||
|
|
|
||
|
|
// Copyright 2020 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 p
|
||
|
|
|
||
|
|
type T struct { // big enough to be an unSSAable type
|
||
|
|
a, b, c, d, e, f int
|
||
|
|
}
|
||
|
|
|
||
|
|
func f(x interface{}, p *int) {
|
||
|
|
_ = *p // trigger nil check here, removing it from below
|
||
|
|
switch x := x.(type) {
|
||
|
|
case *T:
|
||
|
|
// Zero twice, so one of them will be removed by the deadstore pass
|
||
|
|
*x = T{}
|
||
|
|
*p = 0 // store op to prevent Zero ops from being optimized by the earlier opt pass rewrite rules
|
||
|
|
*x = T{}
|
||
|
|
}
|
||
|
|
}
|