1/* SPARC v9 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 2 and store difference in a third limb vector. 3 4 Copyright (C) 1995-2018 Free Software Foundation, Inc. 5 6 This file is part of the GNU MP Library. 7 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. 12 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. 17 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, 20 see <http://www.gnu.org/licenses/>. */ 21 22#include <sysdep.h> 23 24/* INPUT PARAMETERS 25 res_ptr %o0 26 s1_ptr %o1 27 s2_ptr %o2 28 size %o3 */ 29 30ENTRY(__mpn_sub_n) 31 32 sub %g0,%o3,%g5 33 sllx %o3,3,%g1 34 add %o1,%g1,%o1 ! make s1_ptr point at end 35 add %o2,%g1,%o2 ! make s2_ptr point at end 36 add %o0,%g1,%o0 ! make res_ptr point at end 37 mov 0,%o4 ! clear carry variable 38 sllx %g5,3,%o5 ! compute initial address index 39 401: ldx [%o2+%o5],%g1 ! load s2 limb 41 add %g5,1,%g5 ! increment loop count 42 ldx [%o1+%o5],%o3 ! load s1 limb 43 addcc %g1,%o4,%g1 ! add s2 limb and carry variable 44 movcc %xcc,0,%o4 ! if carry-out, o4 was 1; clear it 45 subcc %o3,%g1,%g1 ! subtract s1 limb from sum 46 stx %g1,[%o0+%o5] ! store result 47 add %o5,8,%o5 ! increment address index 48 brnz,pt %g5,1b 49 movcs %xcc,1,%o4 ! if s1 subtract gave carry, record it 50 51 retl 52 mov %o4,%o0 53 54END(__mpn_sub_n) 55