1 /* SPARC v9 __mpn_sub_n -- Subtract two limb vectors of the same length > 0
2 and store difference in a third limb vector.
4 Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
6 This file is part of the GNU MP Library.
8 The GNU MP Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or (at your
11 option) any later version.
13 The GNU MP Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 MA 02111-1307, USA. */
35 add %o1,%g1,%o1 ! make s1_ptr point at end
36 add %o2,%g1,%o2 ! make s2_ptr point at end
37 add %o0,%g1,%o0 ! make res_ptr point at end
38 mov 0,%o4 ! clear carry variable
39 sllx %g5,3,%o5 ! compute initial address index
41 1: ldx [%o2+%o5],%g1 ! load s2 limb
42 add %g5,1,%g5 ! increment loop count
43 ldx [%o1+%o5],%o3 ! load s1 limb
44 addcc %g1,%o4,%g1 ! add s2 limb and carry variable
45 movcc %xcc,0,%o4 ! if carry-out, o4 was 1; clear it
46 subcc %o3,%g1,%g1 ! subtract s1 limb from sum
47 stx %g1,[%o0+%o5] ! store result
48 add %o5,8,%o5 ! increment address index
50 movcs %xcc,1,%o4 ! if s1 subtract gave carry, record it