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runtime: add fastrand64

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Support fastrand64 in the runtime, although fastrand uses wyrand to generate 64-bit random number, it still returns uint32. In some cases, we need to generate a 64-bit random number, the new API would be faster and easier to use, and at least we can use the new function in these places:

src/net/dnsclient.go:randInt()
src/hash/maphash/maphash.go:MakeSeed()
src/runtime/map.go:mapiterinit()

name                 time/op
Fastrand-16          0.09ns ± 5%
Fastrand64-16        0.09ns ± 6%

Change-Id: Ibb97378c7ca59bc7dc15535d4872fa58ea112e6a
Reviewed-on: https://go-review.googlesource.com/c/go/+/400734
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
zhangyunhao 2022-04-18 15:23:20 +08:00 • committed by Gopher Robot
parent 6de00888e4
commit ebe1435fbb
3 changed files with 48 additions and 0 deletions
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1
src/runtime/export_test.go
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@ -277,6 +277,7 @@ func CountPagesInUse() (pagesInUse, counted uintptr) {
}
func Fastrand() uint32 { return fastrand() }
func Fastrand64() uint64 { return fastrand64() }
func Fastrandn(n uint32) uint32 { return fastrandn(n) }
type ProfBuf profBuf