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Atari Mega Archive 1
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src6.zoo
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sqrt.s
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1991-09-24
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752b
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43 lines
# pml compatible lib for the atari sfp004
#
# Michael Ritzert, Oktober 1990
# ritzert@dfg.dbp.de
#
# FUNCTION: SQRT(X)
#
# base = 0xfffa50
# the fpu addresses are taken relativ to "base":
comm = -6
resp = -16
zahl = 0
.even
LC0:
.ascii "sqrt: DOMAIN error\12\15\0"
.even
.text
.even
.globl _sqrt
_sqrt:
tstl a7@(4)
bpl continue
moveml d0-d7/a0-a6,a7@-
pea LC0
movew #9,a7@-
trap #1
addql #6,a7
moveml a7@+,d0-d7/a0-a6
# | continue to get the NAN
continue:
lea 0xfffa50,a0
movew #0x5404,a0@(comm) | specify function
cmpiw #0x8900,a0@(resp) | check
movel a7@(4),a0@ | load arg_hi
movel a7@(8),a0@ | load arg_low
movew #0x7400,a0@(comm) | result to d0
# wait
.long 0x0c688900, 0xfff067f8
movel a0@,d0
movel a0@,d1
rts