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Atari Mega Archive 1
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src6.zoo
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_extends.s
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1991-09-24
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919b
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# single precision floating point stuff for Atari-gcc using the SFP004
# developed with gas
#
# single float to double float conversion routine
#
# M. Ritzert (mjr at dmzrzu71)
#
# 4.10.1990
#
# no NAN checking implemented since the 68881 treats this situation "correct",
# i.e. according to IEEE
# addresses of the 68881 data port. This choice is fastest when much data is
# transferred between the two processors.
comm = -6
resp = -16
zahl = 0
# waiting loop ...
#
# wait:
# ww: cmpiw #0x8900,a1@(resp)
# beq ww
# is coded directly by
# .long 0x0c688900, 0xfff067f8
.text
.even
.globl __extendsfdf2, ___extendsfdf2
__extendsfdf2:
___extendsfdf2:
lea 0xfffa50,a0
movew #0x4400,a0@(comm) | load argument to fp0
cmpiw #0x8900,a0@(resp) | check
movel a7@(4),a0@ | now push arg
movew #0x7400,a0@(comm) | result to d0/d1
.long 0x0c688900, 0xfff067f8
movel a0@,d0 | pop double float
movel a0@,d1
rts