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Annotation of OpenXM_contrib/gmp/mpn/x86/copyd.asm, Revision 1.1.1.2

1.1       maekawa     1: dnl  x86 mpn_copyd -- copy limb vector, decrementing.
                      2:
1.1.1.2 ! ohara       3: dnl  Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
1.1       maekawa     4: dnl
                      5: dnl  This file is part of the GNU MP Library.
                      6: dnl
                      7: dnl  The GNU MP Library is free software; you can redistribute it and/or
                      8: dnl  modify it under the terms of the GNU Lesser General Public License as
                      9: dnl  published by the Free Software Foundation; either version 2.1 of the
                     10: dnl  License, or (at your option) any later version.
                     11: dnl
                     12: dnl  The GNU MP Library is distributed in the hope that it will be useful,
                     13: dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     15: dnl  Lesser General Public License for more details.
                     16: dnl
                     17: dnl  You should have received a copy of the GNU Lesser General Public
                     18: dnl  License along with the GNU MP Library; see the file COPYING.LIB.  If
                     19: dnl  not, write to the Free Software Foundation, Inc., 59 Temple Place -
                     20: dnl  Suite 330, Boston, MA 02111-1307, USA.
                     21:
                     22: include(`../config.m4')
                     23:
                     24:
1.1.1.2 ! ohara      25: C     cycles/limb  startup (approx)
        !            26: C P5:     1.0         40
        !            27: C P6      2.4         70
        !            28: C K6      1.0         55
        !            29: C K7:     1.3         75
        !            30: C P4:     2.6        175
        !            31: C
        !            32: C (Startup time includes some function call overheads.)
        !            33:
        !            34:
1.1       maekawa    35: C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
                     36: C
                     37: C Copy src,size to dst,size, working from high to low addresses.
                     38: C
                     39: C The code here is very generic and can be expected to be reasonable on all
                     40: C the x86 family.
                     41:
                     42: defframe(PARAM_SIZE,12)
                     43: defframe(PARAM_SRC, 8)
                     44: defframe(PARAM_DST, 4)
                     45: deflit(`FRAME',0)
                     46:
1.1.1.2 ! ohara      47:        TEXT
1.1       maekawa    48:        ALIGN(32)
                     49:
                     50: PROLOGUE(mpn_copyd)
                     51:        C eax   saved esi
                     52:        C ebx
                     53:        C ecx   counter
                     54:        C edx   saved edi
                     55:        C esi   src
                     56:        C edi   dst
                     57:        C ebp
                     58:
                     59:        movl    PARAM_SIZE, %ecx
                     60:        movl    %esi, %eax
                     61:
                     62:        movl    PARAM_SRC, %esi
                     63:        movl    %edi, %edx
                     64:
                     65:        movl    PARAM_DST, %edi
                     66:        leal    -4(%esi,%ecx,4), %esi
                     67:
                     68:        leal    -4(%edi,%ecx,4), %edi
                     69:
                     70:        std
                     71:
                     72:        rep
                     73:        movsl
                     74:
                     75:        cld
                     76:
                     77:        movl    %eax, %esi
                     78:        movl    %edx, %edi
                     79:
                     80:        ret
                     81:
                     82: EPILOGUE()