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Annotation of OpenXM_contrib/gmp/mpn/x86/copyd.asm, Revision 1.1.1.1

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()