glibc/sysdeps/hppa/udiv_qrnnd.s

; HP-PA  __udiv_qrnnd division support, used from longlong.h.
; This version runs fast on pre-PA7000 CPUs.

; Copyright (C) 1993, 1994 Free Software Foundation, Inc.

; This file is part of the GNU MP Library.

; The GNU MP Library is free software; you can redistribute it and/or modify
; it under the terms of the GNU Library General Public License as published by
; the Free Software Foundation; either version 2 of the License, or (at your
; option) any later version.

; The GNU MP Library is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
; License for more details.

; You should have received a copy of the GNU Library General Public License
; along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
; MA 02111-1307, USA.


; INPUT PARAMETERS
; rem_ptr	gr26
; n1		gr25
; n0		gr24
; d		gr23

; The code size is a bit excessive.  We could merge the last two ds;addc
; sequences by simply moving the "bb,< Odd" instruction down.  The only
; trouble is the FFFFFFFF code that would need some hacking.

	.code
	.export		__udiv_qrnnd
__udiv_qrnnd
	.proc
	.callinfo	frame=0,no_calls
	.entry

	comb,<		%r23,0,L$largedivisor
	 sub		%r0,%r23,%r1		; clear cy as side-effect
	ds		%r0,%r1,%r0
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r23,%r25
	addc		%r24,%r24,%r28
	ds		%r25,%r23,%r25
	comclr,>=	%r25,%r0,%r0
	addl		%r25,%r23,%r25
	stws		%r25,0(0,%r26)
	bv		0(%r2)
	 addc		%r28,%r28,%r28

L$largedivisor
	extru		%r24,31,1,%r19		; r19 = n0 & 1
	bb,<		%r23,31,L$odd
	 extru		%r23,30,31,%r22		; r22 = d >> 1
	shd		%r25,%r24,1,%r24	; r24 = new n0
	extru		%r25,30,31,%r25		; r25 = new n1
	sub		%r0,%r22,%r21
	ds		%r0,%r21,%r0
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	comclr,>=	%r25,%r0,%r0
	addl		%r25,%r22,%r25
	sh1addl		%r25,%r19,%r25
	stws		%r25,0(0,%r26)
	bv		0(%r2)
	 addc		%r24,%r24,%r28

L$odd	addib,sv,n	1,%r22,L$FF..		; r22 = (d / 2 + 1)
	shd		%r25,%r24,1,%r24	; r24 = new n0
	extru		%r25,30,31,%r25		; r25 = new n1
	sub		%r0,%r22,%r21
	ds		%r0,%r21,%r0
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r24
	ds		%r25,%r22,%r25
	addc		%r24,%r24,%r28
	comclr,>=	%r25,%r0,%r0
	addl		%r25,%r22,%r25
	sh1addl		%r25,%r19,%r25
; We have computed (n1,,n0) / (d + 1), q' = r28, r' = r25
	add,nuv		%r28,%r25,%r25
	addl		%r25,%r1,%r25
	addc		%r0,%r28,%r28
	sub,<<		%r25,%r23,%r0
	addl		%r25,%r1,%r25
	stws		%r25,0(0,%r26)
	bv		0(%r2)
	 addc		%r0,%r28,%r28

; This is just a special case of the code above.
; We come here when d == 0xFFFFFFFF
L$FF..	add,uv		%r25,%r24,%r24
	sub,<<		%r24,%r23,%r0
	ldo		1(%r24),%r24
	stws		%r24,0(0,%r26)
	bv		0(%r2)
	 addc		%r0,%r25,%r28

	.exit
	.procend