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https://github.com/golang/go
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caef4496fc
See discussion at [1]. True value must have a fixed non-zero representation meaning that a && b can be implemented as a & b. [1] https://groups.google.com/forum/#!topic/golang-dev/xV0vPuFP9Vg This change helps with m := a && b, but it's more common to see if a && b { do something } which is not handled. Change-Id: Ib6f9ff898a0a8c05d12466e2464e4fe781035394 Reviewed-on: https://go-review.googlesource.com/22313 Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
109 lines
1.7 KiB
Go
109 lines
1.7 KiB
Go
// +build amd64
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// errorcheck -0 -d=ssa/phiopt/debug=3
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// Copyright 2016 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 main
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//go:noinline
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func f0(a bool) bool {
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x := false
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if a {
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x = true
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} else {
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x = false
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}
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return x // ERROR "converted OpPhi to Copy$"
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}
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//go:noinline
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func f1(a bool) bool {
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x := false
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if a {
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x = false
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} else {
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x = true
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}
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return x // ERROR "converted OpPhi to Not$"
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}
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//go:noinline
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func f2(a, b int) bool {
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x := true
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if a == b {
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x = false
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}
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return x // ERROR "converted OpPhi to Not$"
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}
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//go:noinline
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func f3(a, b int) bool {
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x := false
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if a == b {
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x = true
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}
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return x // ERROR "converted OpPhi to Copy$"
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}
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//go:noinline
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func f4(a, b bool) bool {
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return a || b // ERROR "converted OpPhi to Or8$"
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}
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//go:noinline
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func f5or(a int, b bool) bool {
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var x bool
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if a == 0 {
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x = true
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} else {
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x = b
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}
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return x // ERROR "converted OpPhi to Or8$"
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}
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//go:noinline
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func f5and(a int, b bool) bool {
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var x bool
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if a == 0 {
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x = b
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} else {
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x = false
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}
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return x // ERROR "converted OpPhi to And8$"
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}
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//go:noinline
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func f6or(a int, b bool) bool {
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x := b
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if a == 0 {
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// f6or has side effects so the OpPhi should not be converted.
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x = f6or(a, b)
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}
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return x
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}
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//go:noinline
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func f6and(a int, b bool) bool {
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x := b
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if a == 0 {
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// f6and has side effects so the OpPhi should not be converted.
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x = f6and(a, b)
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}
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return x
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}
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//go:noinline
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func f7or(a bool, b bool) bool {
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return a || b // ERROR "converted OpPhi to Or8$"
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}
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//go:noinline
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func f7and(a bool, b bool) bool {
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return a && b // ERROR "converted OpPhi to And8$"
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}
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func main() {
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}
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