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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
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// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package p
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type T struct {
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s string
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f float64
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}
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func f() {
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var f float64
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var st T
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for {
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switch &st.f {
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case &f:
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f = 1
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}
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}
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}
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