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runtime: speed up key copying in specialized evacuate routines

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Similar to CL 59110.

Change-Id: Ia2858541c86a44b105eacbca9a46b1044632c5ca
Reviewed-on: https://go-review.googlesource.com/59134
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 2017-08-19 07:30:12 -07:00
parent 0480bfe57f
commit cf69867af4
1 changed files with 26 additions and 3 deletions
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29
src/runtime/hashmap_fast.go
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@ -838,7 +838,14 @@ func evacuate_fast32(t *maptype, h *hmap, oldbucket uintptr) {
dst.v = add(dst.k, bucketCnt*4)
}
dst.b.tophash[dst.i&(bucketCnt-1)] = top // mask dst.i as an optimization, to avoid a bounds check
typedmemmove(t.key, dst.k, k) // copy value
// Copy key.
if sys.PtrSize == 4 && t.key.kind&kindNoPointers == 0 && writeBarrier.enabled {
writebarrierptr((*uintptr)(dst.k), *(*uintptr)(k))
} else {
*(*uint32)(dst.k) = *(*uint32)(k)
}
if t.indirectvalue {
*(*unsafe.Pointer)(dst.v) = *(*unsafe.Pointer)(v)
} else {
@ -935,7 +942,20 @@ func evacuate_fast64(t *maptype, h *hmap, oldbucket uintptr) {
dst.v = add(dst.k, bucketCnt*8)
}
dst.b.tophash[dst.i&(bucketCnt-1)] = top // mask dst.i as an optimization, to avoid a bounds check
typedmemmove(t.key, dst.k, k) // copy value
// Copy key.
if t.key.kind&kindNoPointers == 0 && writeBarrier.enabled {
if sys.PtrSize == 8 {
writebarrierptr((*uintptr)(dst.k), *(*uintptr)(k))
} else {
// There are three ways to squeeze at least one 32 bit pointer into 64 bits.
// Give up and call typedmemmove.
typedmemmove(t.key, dst.k, k)
}
} else {
*(*uint64)(dst.k) = *(*uint64)(k)
}
if t.indirectvalue {
*(*unsafe.Pointer)(dst.v) = *(*unsafe.Pointer)(v)
} else {
@ -1032,7 +1052,10 @@ func evacuate_faststr(t *maptype, h *hmap, oldbucket uintptr) {
dst.v = add(dst.k, bucketCnt*2*sys.PtrSize)
}
dst.b.tophash[dst.i&(bucketCnt-1)] = top // mask dst.i as an optimization, to avoid a bounds check
typedmemmove(t.key, dst.k, k) // copy value
// Copy key.
*(*string)(dst.k) = *(*string)(k)
if t.indirectvalue {
*(*unsafe.Pointer)(dst.v) = *(*unsafe.Pointer)(v)
} else {