;/***
;*triga.a - asin, acos, atan functions 
;*
;*	Copyright (c) 1991-1991, Microsoft Corporation.	All rights reserved.
;*
;*Purpose:
;*   Arc trig  functions to be used with M68K version
;*
;*Revision History:
;*   05-13-92  XY   MAC version
;*
;*******************************************************************************/

#include <traps.a>
#ifdef SANE
#include <sane.a>
#endif

	externW _errno

;double atan(double x)


cProc _CIatan,PUBLIC
	localW fpstat
	localW xtestw
	localW x
cBegin _CIatan
#ifdef SANE
	movem.l <d0/d1>, -(a7)
	pea fpstat
	move.w #FOPROCENTRY,-(a7)
	FP68K			;save current status & set default control

	move.l a0, -(a7)
	move.w #FOATANX,-(a7)
	Elems68K		;atan x

	pea fpstat
	move.w #FOPROCEXIT,-(a7)
	FP68K			;set result status & restore control
	movem.l (a7)+, <d0/d1>

#else
      	fmove.l fpcr,d0

	ftst.x fp0              ;see if it is a valid number
	fmove.l fpsr, d1        ;get status word
	and.l #0x03007c00, d1  ;see if we get an exception
	cmp.l #0, d1
	bne domain_error_fpu

      	fmove.l #0,fpcr
      	fatan.x fp0
	jra to_end_fpu

domain_error_fpu:
	move.l #33, _errno
to_end_fpu:
      	fmove.l	d0,fpcr
#endif
cEnd _CIatan

#ifndef SANE

;double asin(double x)


cProc _CIasin,PUBLIC
cBegin _CIasin
      	fmove.l fpcr,d0
      	fmove.l #0,fpcr
      	fasin.x fp0
      	fmove.l	d0,fpcr
cEnd _CIasin


;double acos(double x)


cProc _CIacos,PUBLIC
cBegin _CIacos
      	fmove.l fpcr,d0
      	fmove.l #0,fpcr
      	facos.x fp0
      	fmove.l	d0,fpcr
cEnd _CIacos

#endif