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net: use fastrand64 in randInt 

Change-Id: If3d8391d81e8de869dbb3c857f0570817e8aa440
Reviewed-on: https://go-review.googlesource.com/c/go/+/400914
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
zhangyunhao 2022-04-19 14:20:29 +08:00 committed by Keith Randall
parent 01b8f5e882
commit a4bbcd4b1f
2 changed files with 4 additions and 7 deletions
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7
src/net/dnsclient.go
View File

@ -13,13 +13,10 @@ import (
)
// provided by runtime
func fastrand() uint32
func fastrandu() uint
func randInt() int {
x, y := fastrand(), fastrand() // 32-bit halves
u := uint(x)<<31 ^ uint(int32(y)) // full uint, even on 64-bit systems; avoid 32-bit shift on 32-bit systems
i := int(u >> 1) // clear sign bit, even on 32-bit systems
return i
return int(fastrandu() >> 1) // clear sign bit
}
func randIntn(n int) int {

4
src/runtime/stubs.go
View File

@ -199,8 +199,8 @@ func fastrandu() uint {
//go:linkname sync_fastrandn sync.fastrandn
func sync_fastrandn(n uint32) uint32 { return fastrandn(n) }
//go:linkname net_fastrand net.fastrand
func net_fastrand() uint32 { return fastrand() }
//go:linkname net_fastrandu net.fastrandu
func net_fastrandu() uint { return fastrandu() }
//go:linkname os_fastrand os.fastrand
func os_fastrand() uint32 { return fastrand() }