From b7c1be03c87ccd35723d85cdea3deab1db96ccf3 Mon Sep 17 00:00:00 2001 From: Andreas Rumpf Date: Fri, 15 Jul 2016 17:04:14 +0200 Subject: added system.newSeqOfCap for improved efficiency --- lib/system/mmdisp.nim | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'lib/system') diff --git a/lib/system/mmdisp.nim b/lib/system/mmdisp.nim index 7ef26a7c1..186349152 100644 --- a/lib/system/mmdisp.nim +++ b/lib/system/mmdisp.nim @@ -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.} -- cgit 1.4.1-2-gfad0