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Annotation of OpenXM/src/kan96xx/gmp-2.0.2/mpn/m68k/add_n.S, Revision 1.1

1.1     ! maekawa     1: /* mc68020 __mpn_add_n -- Add two limb vectors of the same length > 0 and store
        !             2:    sum in a third limb vector.
        !             3:
        !             4: Copyright (C) 1992, 1994, 1996 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 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.
        !            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 Library General Public
        !            16: License for more details.
        !            17:
        !            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. */
        !            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 "sysdep.h"
        !            32: #include "asm-syntax.h"
        !            33:
        !            34:        TEXT
        !            35:        ALIGN
        !            36:        GLOBL   C_SYMBOL_NAME(__mpn_add_n)
        !            37:
        !            38: C_SYMBOL_NAME(__mpn_add_n:)
        !            39: PROLOG(__mpn_add_n)
        !            40: /* Save used registers on the stack.  */
        !            41:        movel   R(d2),MEM_PREDEC(sp)
        !            42:        movel   R(a2),MEM_PREDEC(sp)
        !            43:
        !            44: /* Copy the arguments to registers.  Better use movem?  */
        !            45:        movel   MEM_DISP(sp,12),R(a2)
        !            46:        movel   MEM_DISP(sp,16),R(a0)
        !            47:        movel   MEM_DISP(sp,20),R(a1)
        !            48:        movel   MEM_DISP(sp,24),R(d2)
        !            49:
        !            50:        eorw    #1,R(d2)
        !            51:        lsrl    #1,R(d2)
        !            52:        bcc     L(L1)
        !            53:        subql   #1,R(d2)        /* clears cy as side effect */
        !            54:
        !            55: L(Loop:)
        !            56:        movel   MEM_POSTINC(a0),R(d0)
        !            57:        movel   MEM_POSTINC(a1),R(d1)
        !            58:        addxl   R(d1),R(d0)
        !            59:        movel   R(d0),MEM_POSTINC(a2)
        !            60: L(L1:) movel   MEM_POSTINC(a0),R(d0)
        !            61:        movel   MEM_POSTINC(a1),R(d1)
        !            62:        addxl   R(d1),R(d0)
        !            63:        movel   R(d0),MEM_POSTINC(a2)
        !            64:
        !            65:        dbf     R(d2),L(Loop)           /* loop until 16 lsb of %4 == -1 */
        !            66:        subxl   R(d0),R(d0)     /* d0 <= -cy; save cy as 0 or -1 in d0 */
        !            67:        subl    #0x10000,R(d2)
        !            68:        bcs     L(L2)
        !            69:        addl    R(d0),R(d0)     /* restore cy */
        !            70:        bra     L(Loop)
        !            71:
        !            72: L(L2:)
        !            73:        negl    R(d0)
        !            74:
        !            75: /* Restore used registers from stack frame.  */
        !            76:        movel   MEM_POSTINC(sp),R(a2)
        !            77:        movel   MEM_POSTINC(sp),R(d2)
        !            78:
        !            79:        rts
        !            80: EPILOG(__mpn_add_n)