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VM: improvements for var T/addr (#12667); fixes #12489

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Andreas Rumpf 2019-11-28 09:56:02 +01:00 • committed by GitHub
commit abe07eb75d
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6 changed files with 156 additions and 11 deletions
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22
compiler/vmgen.nim
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@ -1417,12 +1417,11 @@ proc genAddr(c: PCtx, n: PNode, dest: var TDest, flags: TGenFlags) =
gen(c, m, dest, flags)
return
let af = if n[0].kind in {nkBracketExpr, nkDotExpr, nkCheckedFieldExpr}: {gfNode}
else: {gfNodeAddr}
let newflags = flags-{gfNode, gfNodeAddr}+af
let newflags = flags-{gfNode}+{gfNodeAddr}
if isGlobal(n.sons[0]):
gen(c, n.sons[0], dest, flags+af)
if isGlobal(n.sons[0]) or n[0].kind in {nkDotExpr, nkCheckedFieldExpr, nkBracketExpr}:
# checking for this pattern: addr(obj.field) / addr(array[i])
gen(c, n.sons[0], dest, newflags)
else:
let tmp = c.genx(n.sons[0], newflags)
if dest < 0: dest = c.getTemp(n.typ)
@ -1663,7 +1662,9 @@ proc genArrAccessOpcode(c: PCtx; n: PNode; dest: var TDest; opc: TOpcode;
let a = c.genx(n.sons[0], flags)
let b = c.genIndex(n.sons[1], n.sons[0].typ)
if dest < 0: dest = c.getTemp(n.typ)
if needsRegLoad():
if opc == opcLdArr and {gfNodeAddr} * flags != {}:
c.gABC(n, opcLdArrAddr, dest, a, b)
elif needsRegLoad():
var cc = c.getTemp(n.typ)
c.gABC(n, opc, cc, a, b)
c.gABC(n, opcNodeToReg, dest, cc)
@ -1679,7 +1680,9 @@ proc genObjAccess(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags) =
let a = c.genx(n.sons[0], flags)
let b = genField(c, n.sons[1])
if dest < 0: dest = c.getTemp(n.typ)
if needsRegLoad():
if {gfNodeAddr} * flags != {}:
c.gABC(n, opcLdObjAddr, dest, a, b)
elif needsRegLoad():
var cc = c.getTemp(n.typ)
c.gABC(n, opcLdObj, cc, a, b)
c.gABC(n, opcNodeToReg, dest, cc)
@ -1733,7 +1736,10 @@ proc genCheckedObjAccess(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags) =
# Load the content now
if dest < 0: dest = c.getTemp(n.typ)
let fieldPos = genField(c, field)
if needsRegLoad():
if {gfNodeAddr} * flags != {}:
c.gABC(n, opcLdObjAddr, dest, objR, fieldPos)
elif needsRegLoad():
var cc = c.getTemp(accessExpr.typ)
c.gABC(n, opcLdObj, cc, objR, fieldPos)
c.gABC(n, opcNodeToReg, dest, cc)