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On ARM64, an If block is lowered to (NZ cond yes no). This is incorrect because cond is a boolean value and therefore only the last byte is meaningful (same as AMD64, see ARM64Ops.go). But here we are comparing a full register width with 0. Correct it by comparing only the last bit. Fixes #52788. Change-Id: I2cacf9f3d2f45e149c361a290f511b2d4ed845c4 Reviewed-on: https://go-review.googlesource.com/c/go/+/405114 TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com> Run-TryBot: Cherry Mui <cherryyz@google.com>
28 lines
605 B
Go
28 lines
605 B
Go
// run
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// Copyright 2022 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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// Issue 52788: miscompilation for boolean comparison on ARM64.
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package main
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import (
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"fmt"
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"reflect"
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)
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func f(next func() bool) {
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for b := next(); b; b = next() {
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fmt.Printf("next() returned %v\n", b)
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}
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}
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func main() {
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next := reflect.MakeFunc(reflect.TypeOf((func() bool)(nil)), func(_ []reflect.Value) []reflect.Value {
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return []reflect.Value{reflect.ValueOf(false)}
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})
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reflect.ValueOf(f).Call([]reflect.Value{next})
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}
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