1 /* mc68020 __mpn_add_n -- Add two limb vectors of the same length > 0 and store
2 sum in a third limb vector.
4 Copyright (C) 1992, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
30 #include "asm-syntax.h"
37 /* Save used registers on the stack. */
38 INSN2(move,l ,MEM_PREDEC(sp),d2)
39 INSN2(move,l ,MEM_PREDEC(sp),a2)
41 /* Copy the arguments to registers. Better use movem? */
42 INSN2(move,l ,a2,MEM_DISP(sp,12))
43 INSN2(move,l ,a0,MEM_DISP(sp,16))
44 INSN2(move,l ,a1,MEM_DISP(sp,20))
45 INSN2(move,l ,d2,MEM_DISP(sp,24))
50 INSN2(subq,l ,d2,#1) /* clears cy as side effect */
53 INSN2(move,l ,d0,MEM_POSTINC(a0))
54 INSN2(move,l ,d1,MEM_POSTINC(a1))
56 INSN2(move,l ,MEM_POSTINC(a2),d0)
57 LAB(L1) INSN2(move,l ,d0,MEM_POSTINC(a0))
58 INSN2(move,l ,d1,MEM_POSTINC(a1))
60 INSN2(move,l ,MEM_POSTINC(a2),d0)
62 dbf d2,Loop /* loop until 16 lsb of %4 == -1 */
63 INSN2(subx,l ,d0,d0) /* d0 <= -cy; save cy as 0 or -1 in d0 */
64 INSN2(sub,l ,d2,#0x10000)
66 INSN2(add,l ,d0,d0) /* restore cy */
72 /* Restore used registers from stack frame. */
73 INSN2(move,l ,a2,MEM_POSTINC(sp))
74 INSN2(move,l ,d2,MEM_POSTINC(sp))