dnl  HP-PA mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
dnl  store difference in a third limb vector.  Optimized for the PA7100, where
dnl  is runs at 4.25 cycles/limb.

dnl  Copyright 1992, 1994, 2000-2003 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.
dnl
dnl  The GNU MP Library is free software; you can redistribute it and/or modify
dnl  it under the terms of either:
dnl
dnl    * the GNU Lesser General Public License as published by the Free
dnl      Software Foundation; either version 3 of the License, or (at your
dnl      option) any later version.
dnl
dnl  or
dnl
dnl    * the GNU General Public License as published by the Free Software
dnl      Foundation; either version 2 of the License, or (at your option) any
dnl      later version.
dnl
dnl  or both in parallel, as here.
dnl
dnl  The GNU MP Library is distributed in the hope that it will be useful, but
dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
dnl  for more details.
dnl
dnl  You should have received copies of the GNU General Public License and the
dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
dnl  see https://www.gnu.org/licenses/.

include(`../config.m4')

C INPUT PARAMETERS
C res_ptr	r26
C s1_ptr	r25
C s2_ptr	r24
C size		r23

ASM_START()
PROLOGUE(mpn_sub_n)
	ldws,ma		4(0,%r25),%r20
	ldws,ma		4(0,%r24),%r19

	addib,<=	-5,%r23,L(rest)
	 sub		%r20,%r19,%r28	C subtract first limbs ignoring cy

LDEF(loop)
	ldws,ma		4(0,%r25),%r20
	ldws,ma		4(0,%r24),%r19
	stws,ma		%r28,4(0,%r26)
	subb		%r20,%r19,%r28
	ldws,ma		4(0,%r25),%r20
	ldws,ma		4(0,%r24),%r19
	stws,ma		%r28,4(0,%r26)
	subb		%r20,%r19,%r28
	ldws,ma		4(0,%r25),%r20
	ldws,ma		4(0,%r24),%r19
	stws,ma		%r28,4(0,%r26)
	subb		%r20,%r19,%r28
	ldws,ma		4(0,%r25),%r20
	ldws,ma		4(0,%r24),%r19
	stws,ma		%r28,4(0,%r26)
	addib,>		-4,%r23,L(loop)
	subb		%r20,%r19,%r28

LDEF(rest)
	addib,=		4,%r23,L(end)
	nop

LDEF(eloop)
	ldws,ma		4(0,%r25),%r20
	ldws,ma		4(0,%r24),%r19
	stws,ma		%r28,4(0,%r26)
	addib,>		-1,%r23,L(eloop)
	subb		%r20,%r19,%r28

LDEF(end)
	stws		%r28,0(0,%r26)
	addc		%r0,%r0,%r28
	bv		0(%r2)
	 subi		1,%r28,%r28
EPILOGUE()