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added system.newSeqOfCap for improved efficiency

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This commit is contained in:
Andreas Rumpf 2016-07-15 17:04:14 +02:00
commit b7c1be03c8
7 changed files with 47 additions and 4 deletions
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14
lib/system/mmdisp.nim
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@ -354,6 +354,12 @@ elif defined(gogc):
cast[PGenericSeq](result).reserved = len
cast[PGenericSeq](result).elemSize = typ.base.size
proc nimNewSeqOfCap(typ: PNimType, cap: int): pointer {.compilerproc.} =
result = newObj(typ, cap * typ.base.size + GenericSeqSize)
cast[PGenericSeq](result).len = 0
cast[PGenericSeq](result).reserved = cap
cast[PGenericSeq](result).elemSize = typ.base.size
proc growObj(old: pointer, newsize: int): pointer =
# the Go GC doesn't have a realloc
var
@ -447,6 +453,7 @@ elif defined(nogc) and defined(useMalloc):
result = newObj(typ, addInt(mulInt(len, typ.base.size), GenericSeqSize))
cast[PGenericSeq](result).len = len
cast[PGenericSeq](result).reserved = len
proc newObjNoInit(typ: PNimType, size: int): pointer =
result = alloc(size)
@ -506,6 +513,7 @@ elif defined(nogc):
result = newObj(typ, addInt(mulInt(len, typ.base.size), GenericSeqSize))
cast[PGenericSeq](result).len = len
cast[PGenericSeq](result).reserved = len
proc growObj(old: pointer, newsize: int): pointer =
result = realloc(old, newsize)
@ -545,4 +553,10 @@ else:
else:
include "system/gc"
when not declared(nimNewSeqOfCap):
proc nimNewSeqOfCap(typ: PNimType, cap: int): pointer {.compilerproc.} =
result = newObj(typ, addInt(mulInt(cap, typ.base.size), GenericSeqSize))
cast[PGenericSeq](result).len = 0
cast[PGenericSeq](result).reserved = cap
{.pop.}