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runtime: split advanceEvacuationMark from evacuate

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Minor refactoring. This is a step towards specializing evacuate
for mapfast key types.

Change-Id: Icffe2759b7d38e5c008d03941918d5a912ce62f6
Reviewed-on: https://go-review.googlesource.com/56933
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-08-17 10:37:17 -07:00
parent 43d4c9f4f1
commit e0b34e7be7
1 changed files with 23 additions and 20 deletions
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7
src/runtime/hashmap.go
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@ -1138,8 +1138,12 @@ func evacuate(t *maptype, h *hmap, oldbucket uintptr) {
}
}
// Advance evacuation mark
if oldbucket == h.nevacuate {
advanceEvacuationMark(h, t, newbit)
}
}
func advanceEvacuationMark(h *hmap, t *maptype, newbit uintptr) {
h.nevacuate++
// Experiments suggest that 1024 is overkill by at least an order of magnitude.
// Put it in there as a safeguard anyway, to ensure O(1) behavior.
@ -1162,7 +1166,6 @@ func evacuate(t *maptype, h *hmap, oldbucket uintptr) {
h.flags &^= sameSizeGrow
}
}
}
func ismapkey(t *_type) bool {
return t.alg.hash != nil