// check for omitted fields
	zb0001Len := uint32(18)
	var zb0001Mask uint32 /* 18 bits */
	_ = zb0001Mask
	if z.PartIndices == nil {
		zb0001Len--
		zb0001Mask |= 0x2000
	}
	// variable map header, size zb0001Len
	err = en.WriteMapHeader(zb0001Len)
	if err != nil {
		return
	}

	// skip if no fields are to be emitted
	if zb0001Len != 0 {
		// write "ID"

	ORR	$0x170000, R2, R1                   // ORR	$1507328, R2, R1                // fb02a0d241001baa
	AND	$0xff00ff, R2                       // AND	$16711935, R2                   // fb1f80d2fb1fa0f242001b8a
	AND	$0xff00ffff, R1                     // AND	$4278255615, R1                 // fbff9fd21be0bff221001b8a
	ANDS	$0xffff, R2                         // ANDS	$65535, R2                      // 423c40f2