/* __mpn_sub_n -- Add two limb vectors of the same length > 0 and store   sum in a third limb vector.  64 bit S/390 version.   Copyright (C) 2001 Free Software Foundation, Inc.   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).   This file is part of the GNU MP Library.   The GNU C Library 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.   The GNU C 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   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C 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     %r2 = res_ptr     %r3 = s1_ptr     %r4 = s2_ptr     %r5 = size.  */	#include "sysdep.h"#include "asm-syntax.h"ENTRY(__mpn_sub_n)        stg    %r6,48(%r15)   # save register 6	cfi_offset (%r6,-112)        sgr    %r1,%r1        lghi   %r0,1          # cannot use ahi to add carry, use slr.L0:	lg     %r6,0(%r1,%r3) # .L0 -> no carry from last sub	slg    %r6,0(%r1,%r4)	stg    %r6,0(%r1,%r2)	la     %r1,8(%r1)	brc    4,.L3.L1:	brct   %r5,.L0	slgr   %r2,%r2	      # no last carry to return	j      .Lexit.L2:	lg     %r6,0(%r1,%r3) # .L2 -> carry from last sub	slg    %r6,0(%r1,%r4)	brc    4,.L4	slgr   %r6,%r0	      # no carry yet, add carry from last sub	stg    %r6,0(%r1,%r2)	la     %r1,8(%r1)	brc    11,.L1	      # new carry ?.L3:	brct   %r5,.L2	lgr    %r2,%r0	      # return last carry	j      .Lexit.L4:	slgr   %r6,%r0	      # already a carry, add carry from last sub	stg    %r6,0(%r1,%r2)	la     %r1,8(%r1)	brct   %r5,.L2	lgr    %r2,%r0	      # return last carry.Lexit: lg     %r6,48(%r15)   # restore register 6	br     %r14END(__mpn_sub_n)