panic("cryptobyte: internal error")
		}
		var lenLen, lenByte uint8
		if int64(length) > 0xfffffffe {
			b.err = errors.New("pending ASN.1 child too long")
			return
		} else if length > 0xffffff {
			lenLen = 5
			lenByte = 0x80 | 4
		} else if length > 0xffff {
			lenLen = 4
			lenByte = 0x80 | 3
		} else if length > 0xff {
			lenLen = 3
			lenByte = 0x80 | 2
		} else if length > 0x7f {
			lenLen = 2

	// long-form.
	var length, headerLen uint32 // length includes headerLen
	if lenByte&0x80 == 0 {
		// Short-form length (section 8.1.3.4), encoded in bits 1-7.
		length = uint32(lenByte) + 2
		headerLen = 2
	} else {
		// Long-form length (section 8.1.3.5). Bits 1-7 encode the number of octets
		// used to encode the length.
		lenLen := lenByte & 0x7f
		var len32 uint32

	ptrType := v.Type.Elem().PtrTo()
	lenType := types.Int

	ptr := v.Block.NewValue0(v.Pos, OpPhi, ptrType)
	len := v.Block.NewValue0(v.Pos, OpPhi, lenType)
	cap := v.Block.NewValue0(v.Pos, OpPhi, lenType)
	for _, a := range v.Args {
		ptr.AddArg(a.Block.NewValue1(v.Pos, OpSlicePtr, ptrType, a))
		len.AddArg(a.Block.NewValue1(v.Pos, OpSliceLen, lenType, a))
		cap.AddArg(a.Block.NewValue1(v.Pos, OpSliceCap, lenType, a))

		result |= uint32(v[i])
	}
	*out = result
	return true
}

func (s *String) readLengthPrefixed(lenLen int, outChild *String) bool {
	lenBytes := s.read(lenLen)
	if lenBytes == nil {
		return false
	}
	var length uint32
	for _, b := range lenBytes {
		length = length << 8
		length = length | uint32(b)
	}
	v := s.read(int(length))
	if v == nil {
		return false
	}
	*outChild = v

	} else {
		// Otherwise, open code unsafe.Slice to prevent runtime call overhead.
		// Keep this code in sync with runtime.unsafeslice{,64}
		if len.Type().IsKind(types.TIDEAL) || len.Type().Size() <= types.Types[types.TUINT].Size() {
			lenType = types.Types[types.TINT]
		} else {
			// len64 := int64(len)

func (f *Func) SplitSlice(name *LocalSlot) (*LocalSlot, *LocalSlot, *LocalSlot) {
	ptrType := types.NewPtr(name.Type.Elem())
	lenType := types.Types[types.TINT]
	p := f.SplitSlot(name, ".ptr", 0, ptrType)
	l := f.SplitSlot(name, ".len", ptrType.Size(), lenType)
	c := f.SplitSlot(name, ".cap", ptrType.Size()+lenType.Size(), lenType)
	return p, l, c
}

func (f *Func) SplitComplex(name *LocalSlot) (*LocalSlot, *LocalSlot) {

	s.startBlock(bThen)
	s.vars[n] = s.zeroVal(lenType)
	s.endBlock()
	bThen.AddEdgeTo(bAfter)

	b.AddEdgeTo(bElse)
	s.startBlock(bElse)
	switch n.Op() {
	case ir.OLEN:
		// length is stored in the first word for map/chan
		s.vars[n] = s.load(lenType, x)
	case ir.OCAP:
		// capacity is stored in the second word for chan
		sw := s.newValue1I(ssa.OpOffPtr, lenType.PtrTo(), lenType.Size(), x)