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minor stuff

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This commit is contained in:
Arne Döring 2019-08-27 12:21:04 +02:00
commit ab8241ad42
4 changed files with 8 additions and 14 deletions
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14
compiler/vmgen.nim
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@ -682,6 +682,7 @@ proc genUnaryABI(c: PCtx; n: PNode; dest: var TDest; opc: TOpcode; imm: BiggestI
c.gABI(n, opc, dest, tmp, imm)
c.freeTemp(tmp)
proc genBinaryABC(c: PCtx; n: PNode; dest: var TDest; opc: TOpcode) =
let
tmp = c.genx(n.sons[1])
@ -999,22 +1000,15 @@ proc genMagic(c: PCtx; n: PNode; dest: var TDest; m: TMagic) =
of mMulF64: genBinaryABC(c, n, dest, opcMulFloat)
of mDivF64: genBinaryABC(c, n, dest, opcDivFloat)
of mShrI:
# the idea here is to narrow type if needed before executing right shift
# inlined modified: genNarrowU(c, n, dest)
let t = skipTypes(n.typ, abstractVar-{tyTypeDesc})
# uint is uint64 in the VM, we we only need to mask the result for
# other unsigned types:
# modified: genBinaryABC(c, n, dest, opcShrInt)
# narrowU is applied to the left operandthe idea here is to narrow the left operand
let tmp = c.genx(n.sons[1])
if t.kind in {tyUInt8..tyUInt32, tyInt8..tyInt32}:
c.gABC(n, opcNarrowU, tmp, TRegister(t.size*8))
# inlined modified: genBinaryABC(c, n, dest, opcShrInt)
c.genNarrowU(n, tmp)
let tmp2 = c.genx(n.sons[2])
if dest < 0: dest = c.getTemp(n.typ)
c.gABC(n, opcShrInt, dest, tmp, tmp2)
c.freeTemp(tmp)
c.freeTemp(tmp2)
of mShlI:
genBinaryABC(c, n, dest, opcShlInt)
# genNarrowU modified