alt_slen
".fill -(((" alt_rlen(num) ")-(" alt_slen ")) > 0) * " \
"((" alt_rlen(num) ")-(" alt_slen ")) / 4, 4, 0x03400000\n"
".fill -((" alt_max_short(alt_rlen(num1), alt_rlen(num2)) " - (" alt_slen ")) > 0) * " \
"(" alt_max_short(alt_rlen(num1), alt_rlen(num2)) " - (" alt_slen ")) / 4, " \
".skip -(((" alt_rlen ")-(" alt_slen ")) > 0) * " \
"((" alt_rlen ")-(" alt_slen ")),0x90\n" \