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89 lines
1.5 KiB
89 lines
1.5 KiB
;/***
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;*triga.a - asin, acos, atan functions
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;*
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;* Copyright (c) 1991-1991, Microsoft Corporation. All rights reserved.
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;*
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;*Purpose:
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;* Arc trig functions to be used with M68K version
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;*
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;*Revision History:
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;* 05-13-92 XY MAC version
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;*
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;*******************************************************************************/
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#include <traps.a>
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#ifdef SANE
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#include <sane.a>
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#endif
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externW _errno
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;double atan(double x)
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cProc _CIatan,PUBLIC
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localW fpstat
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localW xtestw
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localW x
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cBegin _CIatan
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#ifdef SANE
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movem.l <d0/d1>, -(a7)
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pea fpstat
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move.w #FOPROCENTRY,-(a7)
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FP68K ;save current status & set default control
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move.l a0, -(a7)
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move.w #FOATANX,-(a7)
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Elems68K ;atan x
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pea fpstat
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move.w #FOPROCEXIT,-(a7)
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FP68K ;set result status & restore control
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movem.l (a7)+, <d0/d1>
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#else
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fmove.l fpcr,d0
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ftst.x fp0 ;see if it is a valid number
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fmove.l fpsr, d1 ;get status word
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and.l #0x03007c00, d1 ;see if we get an exception
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cmp.l #0, d1
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bne domain_error_fpu
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fmove.l #0,fpcr
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fatan.x fp0
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jra to_end_fpu
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domain_error_fpu:
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move.l #33, _errno
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to_end_fpu:
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fmove.l d0,fpcr
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#endif
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cEnd _CIatan
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#ifndef SANE
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;double asin(double x)
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cProc _CIasin,PUBLIC
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cBegin _CIasin
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fmove.l fpcr,d0
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fmove.l #0,fpcr
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fasin.x fp0
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fmove.l d0,fpcr
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cEnd _CIasin
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;double acos(double x)
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cProc _CIacos,PUBLIC
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cBegin _CIacos
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fmove.l fpcr,d0
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fmove.l #0,fpcr
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facos.x fp0
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fmove.l d0,fpcr
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cEnd _CIacos
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#endif
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