;/***
;*sqrtl.a - square root 
;*
;*	Copyright (c) 1991-1991, Microsoft Corporation.	All rights reserved.
;*
;*Purpose:
;*   Square root to be used with M68K version
;*
;*Revision History:
;*   06-04-92  XY   based on sqrt.a
;*
;*******************************************************************************/


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

	externW _errno

;long double sqrtl(long double x)

cProc sqrtl,PUBLIC
	parmT x
	localW fpstat
	localV xlocalx,10
	localW xtestw
cBegin sqrtl
#ifdef SANE
	pea fpstat
	move.w #FOPROCENTRY,-(a7)
	FP68K			;save current status & set default control

	btst #7, x
	ifne
	    	move.l #33, _errno    ; set errno to EDOM
	    	lea x, a0
		move.w #0, d0
		move.l #0, d1
		move.l #0, a0        ; return 0 for negative
		jra to_end
	endif

	pea x
	move.w #FOSQRT,-(a7)
	FP68K			;sqrt x

	lea x,a1
	move.w (a1)+,d0		;load result for return
	move.l (a1)+,d1
	move.l (a1),a0
	jra to_end

to_end:
	pea fpstat
	move.w #FOPROCEXIT,-(a7)
	FP68K			;set result status & restore control
#else
      	fmove.l fpcr,d0

	fmove.x x, fp0
	ftst.x fp0              ;see if it is a valid number
	fmove.l fpsr, d1        ;get status word
	and.l #0x0b007c00, d1  ;see if we get a negative or an exception
	cmp.l #0, d1
	bne domain_error_fpu

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

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