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 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 Library General Public License as published by
10 the Free Software Foundation; either version 2 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 Library General Public
16 License for more details.
18 You should have received a copy of the GNU Library 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 %g3,3,%o5 ! compute initial address index
41 1: ldx [%o2+%o5],%g1 ! load s2 limb
42 add %g3,1,%g3 ! increment loop count
43 ldx [%o1+%o5],%g2 ! 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 %g2,%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