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internal/runtime/maps: speed up modulo 

For #54766.

Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest-swissmap
Change-Id: Ic47721e101f6fee650e6825a5a241fcd12fa0009
Reviewed-on: https://go-review.googlesource.com/c/go/+/611185
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Michael Pratt 2024-08-12 16:38:58 -04:00 committed by Gopher Robot
parent efa43c57b1
commit bb46b754be
1 changed files with 1 additions and 1 deletions
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2
src/internal/runtime/maps/table.go
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@ -571,7 +571,7 @@ func (it *Iter) Next() {
//
// We could avoid most of these lookups if we left a flag
// behind on the old table to denote that it is stale.
dirIdx := int((uint64(it.dirIdx) + it.dirOffset) % uint64(len(it.m.directory)))
dirIdx := int((uint64(it.dirIdx) + it.dirOffset) & uint64(len(it.m.directory)-1))
newTab := it.m.directory[dirIdx]
if it.tab == nil {
if newTab.index != dirIdx {