mirror of https://github.com/lianthony/NT4.0
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
81 lines
1.4 KiB
81 lines
1.4 KiB
;/***
|
|
;*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
|
|
|
|
|
|
|