From 63f762bcdea96889d8ffa406804665b84bda63ab Mon Sep 17 00:00:00 2001 From: Keith Randall Date: Thu, 14 Nov 2024 16:58:07 -0800 Subject: internal/runtime/maps: eliminate a load from the hot path typ.Group.Size involves two loads. Instead cache GroupSize as a separate fields of the map type so we can get to it in just one load. Change-Id: I10ffdce1c7f75dcf448da14040fda78f0d75fd1d Reviewed-on: https://go-review.googlesource.com/c/go/+/627716 Reviewed-by: Cherry Mui Reviewed-by: Michael Pratt LUCI-TryBot-Result: Go LUCI --- src/cmd/compile/internal/reflectdata/map_swiss.go | 1 + 1 file changed, 1 insertion(+) (limited to 'src/cmd/compile') diff --git a/src/cmd/compile/internal/reflectdata/map_swiss.go b/src/cmd/compile/internal/reflectdata/map_swiss.go index 98abd69c34..629136821b 100644 --- a/src/cmd/compile/internal/reflectdata/map_swiss.go +++ b/src/cmd/compile/internal/reflectdata/map_swiss.go @@ -276,6 +276,7 @@ func writeSwissMapType(t *types.Type, lsym *obj.LSym, c rttype.Cursor) { c.Field("Elem").WritePtr(s2) c.Field("Group").WritePtr(s3) c.Field("Hasher").WritePtr(hasher) + c.Field("GroupSize").WriteUintptr(uint64(gtyp.Size())) c.Field("SlotSize").WriteUintptr(uint64(slotTyp.Size())) c.Field("ElemOff").WriteUintptr(uint64(elemOff)) var flags uint32 -- cgit v1.3