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master
test/fixedbugs/issue16985.go
37 строк
625 B
Cherry Zhang
cmd/compile: mark some AMD64 atomic ops as clobberFlags
06 сен 2016, 17:26
06 сен 2016, 17:26
f1ef5a0
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// run // Copyright 2016 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. // issue 16985: intrinsified AMD64 atomic ops should clobber flags package main import "sync/atomic" var count uint32 func main() { buffer := []byte("T") for i := 0; i < len(buffer); { atomic.AddUint32(&count, 1) _ = buffer[i] i++ i++ } for i := 0; i < len(buffer); { atomic.CompareAndSwapUint32(&count, 0, 1) _ = buffer[i] i++ i++ } for i := 0; i < len(buffer); { atomic.SwapUint32(&count, 1) _ = buffer[i] i++ i++ } }