switch opcodeTable[v.Op].auxType {
				case auxSym:
					if v.Aux != nil {
						continue
					}
				case auxSymOff:
					if v.Aux != nil || v.AuxInt < 0 || v.AuxInt >= minZeroPage {
						continue
					}
				case auxSymValAndOff:
					off := ValAndOff(v.AuxInt).Off()
					if v.Aux != nil || off < 0 || off >= minZeroPage {
						continue
					}
				case auxInt32:

			idx = ptr.Args[1]
			if idx.Op == OpAdd32 || idx.Op == OpAdd64 {
				if idx.Args[0].Op == OpConst32 || idx.Args[0].Op == OpConst64 {
					off += idx.Args[0].AuxInt
					idx = idx.Args[1]
				} else if idx.Args[1].Op == OpConst32 || idx.Args[1].Op == OpConst64 {
					off += idx.Args[1].AuxInt
					idx = idx.Args[0]
				}
			}
			ptr = ptr.Args[0]
		} else {
			return BaseAddress{ptr: ptr, idx: idx}, off
		}
	}
}

//                   in 2 instructions on x86.)

// umagicOK reports whether we should strength reduce a n-bit divide by c.
func umagicOK(n uint, c int64) bool {
	// Convert from ConstX auxint values to the real uint64 constant they represent.
	d := uint64(c) << (64 - n) >> (64 - n)

	// Doesn't work for 0.
	// Don't use for powers of 2.
	return d&(d-1) != 0
}

		return c > 0 // smaller uses come later
	}
	// These comparisons are fairly arbitrary.
	// The goal here is stability in the face
	// of unrelated changes elsewhere in the compiler.
	if c := x.AuxInt - y.AuxInt; c != 0 {
		return c < 0
	}
	if cmp := x.Type.Compare(y.Type); cmp != types.CMPeq {
		return cmp == types.CMPlt
	}
	return x.ID < y.ID
}

func (op Op) isLoweredGetClosurePtr() bool {
	switch op {

		if !hasAnyArgOp(v) {
			continue
		}
		if v.Aux == nil {
			f.Fatalf("%s has nil Aux\n", v.LongString())
		}
		if v.Op == OpArg {
			loc := LocalSlot{N: v.Aux.(*ir.Name), Type: v.Type, Off: v.AuxInt}
			if f.pass.debug > stackDebug {
				fmt.Printf("stackalloc OpArg %s to %s\n", v, loc)
			}
			f.setHome(v, loc)
			continue
		}

	if !n.isGenericIntConst() {
		panic("newconst on non-constant")
	}

	// If the same constant is already present in the poset through a different
	// Value, just alias to it without allocating a new node.
	val := n.AuxInt
	if po.flags&posetFlagUnsigned != 0 {
		val = int64(n.AuxUnsigned())
	}
	if c, found := po.constants[val]; found {
		po.values[n.ID] = c
		po.upushalias(n.ID, 0)
		return
	}