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runtime: use fastrand64 in mapiterinit

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Change-Id: I5698c7576a0f39ae62de7bea64286ac8e578d421
Reviewed-on: https://go-review.googlesource.com/c/go/+/400916
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 16:38:04 +08:00 committed by Keith Randall
parent c2d436dcfa
commit 01b8f5e882
1 changed files with 4 additions and 2 deletions
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6
src/runtime/map.go
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@ -842,9 +842,11 @@ func mapiterinit(t *maptype, h *hmap, it *hiter) {
} }
// decide where to start // decide where to start
r := uintptr(fastrand()) var r uintptr
if h.B > 31-bucketCntBits { if h.B > 31-bucketCntBits {
r += uintptr(fastrand()) << 31 r = uintptr(fastrand64())
} else {
r = uintptr(fastrand())
} }
it.startBucket = r & bucketMask(h.B) it.startBucket = r & bucketMask(h.B)
it.offset = uint8(r >> h.B & (bucketCnt - 1)) it.offset = uint8(r >> h.B & (bucketCnt - 1))