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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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16
compiler/vmgen.nim
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@ -597,16 +597,27 @@ proc genNew(c: PCtx; n: PNode) =
c.freeTemp(dest)
proc genNewSeq(c: PCtx; n: PNode) =
let dest = if needsAsgnPatch(n.sons[1]): c.getTemp(n.sons[1].typ)
let t = n.sons[1].typ
let dest = if needsAsgnPatch(n.sons[1]): c.getTemp(t)
else: c.genx(n.sons[1])
let tmp = c.genx(n.sons[2])
c.gABx(n, opcNewSeq, dest, c.genType(n.sons[1].typ.skipTypes(
c.gABx(n, opcNewSeq, dest, c.genType(t.skipTypes(
abstractVar-{tyTypeDesc})))
c.gABx(n, opcNewSeq, tmp, 0)
c.freeTemp(tmp)
c.genAsgnPatch(n.sons[1], dest)
c.freeTemp(dest)
proc genNewSeqOfCap(c: PCtx; n: PNode; dest: var TDest) =
let t = n.typ
let tmp = c.getTemp(n.sons[1].typ)
c.gABx(n, opcLdNull, dest, c.genType(t))
c.gABx(n, opcLdImmInt, tmp, 0)
c.gABx(n, opcNewSeq, dest, c.genType(t.skipTypes(
abstractVar-{tyTypeDesc})))
c.gABx(n, opcNewSeq, tmp, 0)
c.freeTemp(tmp)
proc genUnaryABC(c: PCtx; n: PNode; dest: var TDest; opc: TOpcode) =
let tmp = c.genx(n.sons[1])
if dest < 0: dest = c.getTemp(n.typ)
@ -782,6 +793,7 @@ proc genMagic(c: PCtx; n: PNode; dest: var TDest; m: TMagic) =
of mNewSeq:
unused(n, dest)
c.genNewSeq(n)
of mNewSeqOfCap: c.genNewSeqOfCap(n, dest)
of mNewString:
genUnaryABC(c, n, dest, opcNewStr)
# XXX buggy