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Annotation of OpenXM_contrib/gmp/mpn/x86/copyd.asm, Revision 1.1

1.1     ! maekawa     1: dnl  x86 mpn_copyd -- copy limb vector, decrementing.
        !             2: dnl
        !             3: dnl  Future: On P6 an MMX loop should be able to go faster than this code.
        !             4:
        !             5:
        !             6: dnl  Copyright (C) 1999, 2000 Free Software Foundation, Inc.
        !             7: dnl
        !             8: dnl  This file is part of the GNU MP Library.
        !             9: dnl
        !            10: dnl  The GNU MP Library is free software; you can redistribute it and/or
        !            11: dnl  modify it under the terms of the GNU Lesser General Public License as
        !            12: dnl  published by the Free Software Foundation; either version 2.1 of the
        !            13: dnl  License, or (at your option) any later version.
        !            14: dnl
        !            15: dnl  The GNU MP Library is distributed in the hope that it will be useful,
        !            16: dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            17: dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            18: dnl  Lesser General Public License for more details.
        !            19: dnl
        !            20: dnl  You should have received a copy of the GNU Lesser General Public
        !            21: dnl  License along with the GNU MP Library; see the file COPYING.LIB.  If
        !            22: dnl  not, write to the Free Software Foundation, Inc., 59 Temple Place -
        !            23: dnl  Suite 330, Boston, MA 02111-1307, USA.
        !            24:
        !            25:
        !            26: include(`../config.m4')
        !            27:
        !            28:
        !            29: C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
        !            30: C
        !            31: C Copy src,size to dst,size, working from high to low addresses.
        !            32: C
        !            33: C The code here is very generic and can be expected to be reasonable on all
        !            34: C the x86 family.
        !            35: C
        !            36: C P5 - 1.0 cycles/limb.
        !            37: C
        !            38: C P6 - 2.4 cycles/limb, approx 40 cycles startup.
        !            39:
        !            40: defframe(PARAM_SIZE,12)
        !            41: defframe(PARAM_SRC, 8)
        !            42: defframe(PARAM_DST, 4)
        !            43: deflit(`FRAME',0)
        !            44:
        !            45:        .text
        !            46:        ALIGN(32)
        !            47:
        !            48: PROLOGUE(mpn_copyd)
        !            49:        C eax   saved esi
        !            50:        C ebx
        !            51:        C ecx   counter
        !            52:        C edx   saved edi
        !            53:        C esi   src
        !            54:        C edi   dst
        !            55:        C ebp
        !            56:
        !            57:        movl    PARAM_SIZE, %ecx
        !            58:        movl    %esi, %eax
        !            59:
        !            60:        movl    PARAM_SRC, %esi
        !            61:        movl    %edi, %edx
        !            62:
        !            63:        movl    PARAM_DST, %edi
        !            64:        leal    -4(%esi,%ecx,4), %esi
        !            65:
        !            66:        leal    -4(%edi,%ecx,4), %edi
        !            67:
        !            68:        std
        !            69:
        !            70:        rep
        !            71:        movsl
        !            72:
        !            73:        cld
        !            74:
        !            75:        movl    %eax, %esi
        !            76:        movl    %edx, %edi
        !            77:
        !            78:        ret
        !            79:
        !            80: EPILOGUE()