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Annotation of OpenXM_contrib/gmp/mpn/m68k/mc68020/mul_1.asm, Revision 1.1

1.1     ! ohara       1: dnl  mc68020 mpn_mul_1 -- mpn by limb multiply
        !             2: dnl
        !             3: dnl        cycles/limb
        !             4: dnl  68040:   19.5
        !             5:
        !             6: dnl  Copyright 1992, 1994, 1996, 1999, 2000, 2001 Free Software Foundation,
        !             7: dnl  Inc.
        !             8: dnl
        !             9: dnl  This file is part of the GNU MP Library.
        !            10: dnl
        !            11: dnl  The GNU MP Library is free software; you can redistribute it and/or
        !            12: dnl  modify it under the terms of the GNU Lesser General Public License as
        !            13: dnl  published by the Free Software Foundation; either version 2.1 of the
        !            14: dnl  License, or (at your option) any later version.
        !            15: dnl
        !            16: dnl  The GNU MP Library is distributed in the hope that it will be useful,
        !            17: dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            18: dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            19: dnl  Lesser General Public License for more details.
        !            20: dnl
        !            21: dnl  You should have received a copy of the GNU Lesser General Public
        !            22: dnl  License along with the GNU MP Library; see the file COPYING.LIB.  If
        !            23: dnl  not, write to the Free Software Foundation, Inc., 59 Temple Place -
        !            24: dnl  Suite 330, Boston, MA 02111-1307, USA.
        !            25:
        !            26: include(`../config.m4')
        !            27:
        !            28:
        !            29: C INPUT PARAMETERS
        !            30: C res_ptr      (sp + 4)
        !            31: C s1_ptr       (sp + 8)
        !            32: C s1_size      (sp + 12)
        !            33: C s2_limb      (sp + 16)
        !            34:
        !            35:
        !            36: define(res_ptr, `a0')
        !            37: define(s1_ptr,  `a1')
        !            38: define(s1_size, `d2')
        !            39: define(s2_limb, `d4')
        !            40:
        !            41:
        !            42: PROLOGUE(mpn_mul_1)
        !            43:
        !            44: C Save used registers on the stack.
        !            45:        moveml  d2-d4, M(-,sp)
        !            46:
        !            47: C      movel   d2, M(-,sp)
        !            48: C      movel   d3, M(-,sp)
        !            49: C      movel   d4, M(-,sp)
        !            50:
        !            51: C Copy the arguments to registers.  Better use movem?
        !            52:        movel   M(sp,16), res_ptr
        !            53:        movel   M(sp,20), s1_ptr
        !            54:        movel   M(sp,24), s1_size
        !            55:        movel   M(sp,28), s2_limb
        !            56:
        !            57:        eorw    #1, s1_size
        !            58:        clrl    d1
        !            59:        lsrl    #1, s1_size
        !            60:        bcc     L(L1)
        !            61:        subql   #1, s1_size
        !            62:        subl    d0, d0          C (d0,cy) <= (0,0)
        !            63:
        !            64: L(Loop):
        !            65:        movel   M(s1_ptr,+), d3
        !            66:        mulul   s2_limb, d1:d3
        !            67:        addxl   d0, d3
        !            68:        movel   d3, M(res_ptr,+)
        !            69: L(L1): movel   M(s1_ptr,+), d3
        !            70:        mulul   s2_limb, d0:d3
        !            71:        addxl   d1, d3
        !            72:        movel   d3, M(res_ptr,+)
        !            73:
        !            74:        dbf     s1_size, L(Loop)
        !            75:        clrl    d3
        !            76:        addxl   d3, d0
        !            77:        subl    #0x10000, s1_size
        !            78:        bcc     L(Loop)
        !            79:
        !            80: C Restore used registers from stack frame.
        !            81:        moveml  M(sp,+), d2-d4
        !            82:
        !            83: C      movel   M(sp,+),d4
        !            84: C      movel   M(sp,+),d3
        !            85: C      movel   M(sp,+),d2
        !            86:
        !            87:        rts
        !            88:
        !            89: EPILOGUE(mpn_mul_1)