mpi/supersparc/udiv.S

/* SuperSPARC __udiv_qrnnd division support, used from longlong.h.
 *            This is for SuperSPARC only, to compensate for its
 *            semi-functional udiv instruction.
 *
 *      Copyright (C) 1993, 1994, 1996, 1998,
 *                    2001, 2002 Free Software Foundation, Inc.
 *       
 * This file is part of Libgcrypt.
 *
 * Libgcrypt is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * Libgcrypt 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 *
 * Note: This code is heavily based on the GNU MP Library.
 *	 Actually it's the same code with only minor changes in the
 *	 way the data is stored; this is to support the abstraction
 *	 of an optional secure memory allocation which may be used
 *	 to avoid revealing of sensitive data due to paging etc.
 */



! INPUT PARAMETERS
! rem_ptr	i0
! n1		i1
! n0		i2
! d		i3

#include "sysdep.h"
#undef ret	/* Kludge for glibc */

	.text
	.align	8
LC0:	.double 0r4294967296
LC1:	.double 0r2147483648

	.align	4
	.global C_SYMBOL_NAME(__udiv_qrnnd)
C_SYMBOL_NAME(__udiv_qrnnd):
	!#PROLOGUE# 0
	save	%sp,-104,%sp
	!#PROLOGUE# 1
	st	%i1,[%fp-8]
	ld	[%fp-8],%f10
	sethi	%hi(LC0),%o7
	fitod	%f10,%f4
	ldd	[%o7+%lo(LC0)],%f8
	cmp	%i1,0
	bge	L248
	mov	%i0,%i5
	faddd	%f4,%f8,%f4
L248:
	st	%i2,[%fp-8]
	ld	[%fp-8],%f10
	fmuld	%f4,%f8,%f6
	cmp	%i2,0
	bge	L249
	fitod	%f10,%f2
	faddd	%f2,%f8,%f2
L249:
	st	%i3,[%fp-8]
	faddd	%f6,%f2,%f2
	ld	[%fp-8],%f10
	cmp	%i3,0
	bge	L250
	fitod	%f10,%f4
	faddd	%f4,%f8,%f4
L250:
	fdivd	%f2,%f4,%f2
	sethi	%hi(LC1),%o7
	ldd	[%o7+%lo(LC1)],%f4
	fcmped	%f2,%f4
	nop
	fbge,a	L251
	fsubd	%f2,%f4,%f2
	fdtoi	%f2,%f2
	st	%f2,[%fp-8]
	b	L252
	ld	[%fp-8],%i4
L251:
	fdtoi	%f2,%f2
	st	%f2,[%fp-8]
	ld	[%fp-8],%i4
	sethi	%hi(-2147483648),%g2
	xor	%i4,%g2,%i4
L252:
	umul	%i3,%i4,%g3
	rd	%y,%i0
	subcc	%i2,%g3,%o7
	subxcc	%i1,%i0,%g0
	be	L253
	cmp	%o7,%i3

	add	%i4,-1,%i0
	add	%o7,%i3,%o7
	st	%o7,[%i5]
	ret
	restore
L253:
	blu	L246
	mov	%i4,%i0
	add	%i4,1,%i0
	sub	%o7,%i3,%o7
L246:
	st	%o7,[%i5]
	ret
	restore