mirror of
https://github.com/golang/go
synced 2024-07-21 01:55:06 +00:00
b8cbcacabe
The existing pointer comparison optimizations don't include pointer arithmetic. Add them. These rules trigger a few times in std cmd, while compiling: time.Duration.String cmd/go/internal/tlog.NodeHash crypto/tls.ticketKeyFromBytes (3 times) crypto/elliptic.(*p256Point).p256ScalarMult (15 times!) crypto/elliptic.initTable These weird comparisons occur when using the copy builtin, which does a pointer comparison between src and dst. This also happens to fix #32454, by optimizing enough early on that all values can be eliminated. Fixes #32454 Change-Id: I799d45743350bddd15a295dc1e12f8d03c11d1c6 Reviewed-on: https://go-review.googlesource.com/c/go/+/180940 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
24 lines
312 B
Go
24 lines
312 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 p
|
|
|
|
type T struct {
|
|
s string
|
|
f float64
|
|
}
|
|
|
|
func f() {
|
|
var f float64
|
|
var st T
|
|
for {
|
|
switch &st.f {
|
|
case &f:
|
|
f = 1
|
|
}
|
|
}
|
|
}
|