Return to sub_n.S CVS log

Up to [local] / OpenXM_contrib / gmp / mpn / m68k

Annotation of OpenXM_contrib/gmp/mpn/m68k/sub_n.S, Revision 1.1.1.2

1.1.1.2 ! maekawa     1: /* mc68020 __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
1.1       maekawa     2:    store difference in a third limb vector.
                      3:
1.1.1.2 ! maekawa     4: Copyright (C) 1992, 1994, 1996, 1999, 2000 Free Software Foundation, Inc.
1.1       maekawa     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
1.1.1.2 ! maekawa     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
1.1       maekawa    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
1.1.1.2 ! maekawa    15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: License for more details.
                     17:
1.1.1.2 ! maekawa    18: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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. */
                     22:
                     23: /*
                     24:   INPUT PARAMETERS
                     25:   res_ptr      (sp + 4)
                     26:   s1_ptr       (sp + 8)
                     27:   s2_ptr       (sp + 16)
                     28:   size         (sp + 12)
                     29: */
                     30:
                     31: #include "asm-syntax.h"
                     32:
                     33:        TEXT
                     34:        ALIGN
1.1.1.2 ! maekawa    35:        GLOBL   C_SYMBOL_NAME(__gmpn_sub_n)
1.1       maekawa    36:
1.1.1.2 ! maekawa    37: C_SYMBOL_NAME(__gmpn_sub_n:)
        !            38: PROLOG(__gmpn_sub_n)
1.1       maekawa    39: /* Save used registers on the stack.  */
                     40:        movel   R(d2),MEM_PREDEC(sp)
                     41:        movel   R(a2),MEM_PREDEC(sp)
                     42:
                     43: /* Copy the arguments to registers.  Better use movem?  */
                     44:        movel   MEM_DISP(sp,12),R(a2)
                     45:        movel   MEM_DISP(sp,16),R(a0)
                     46:        movel   MEM_DISP(sp,20),R(a1)
                     47:        movel   MEM_DISP(sp,24),R(d2)
                     48:
                     49:        eorw    #1,R(d2)
                     50:        lsrl    #1,R(d2)
                     51:        bcc     L(L1)
                     52:        subql   #1,R(d2)        /* clears cy as side effect */
                     53:
                     54: L(Loop:)
                     55:        movel   MEM_POSTINC(a0),R(d0)
                     56:        movel   MEM_POSTINC(a1),R(d1)
                     57:        subxl   R(d1),R(d0)
                     58:        movel   R(d0),MEM_POSTINC(a2)
                     59: L(L1:) movel   MEM_POSTINC(a0),R(d0)
                     60:        movel   MEM_POSTINC(a1),R(d1)
                     61:        subxl   R(d1),R(d0)
                     62:        movel   R(d0),MEM_POSTINC(a2)
                     63:
                     64:        dbf     R(d2),L(Loop)           /* loop until 16 lsb of %4 == -1 */
                     65:        subxl   R(d0),R(d0)     /* d0 <= -cy; save cy as 0 or -1 in d0 */
                     66:        subl    #0x10000,R(d2)
                     67:        bcs     L(L2)
                     68:        addl    R(d0),R(d0)     /* restore cy */
                     69:        bra     L(Loop)
                     70:
                     71: L(L2:)
                     72:        negl    R(d0)
                     73:
                     74: /* Restore used registers from stack frame.  */
                     75:        movel   MEM_POSTINC(sp),R(a2)
                     76:        movel   MEM_POSTINC(sp),R(d2)
                     77:
                     78:        rts
1.1.1.2 ! maekawa    79: EPILOG(__gmpn_sub_n)