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

1.1     ! ohara       1: dnl  Intel Pentium mpn_copyd -- copy limb vector, decrementing.
        !             2:
        !             3: dnl  Copyright 1996, 2001, 2002 Free Software Foundation, Inc.
        !             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:
        !            25: C P5: 1.25 cycles/limb
        !            26:
        !            27:
        !            28: C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
        !            29: C
        !            30: C See comments in copyi.asm.
        !            31:
        !            32: defframe(PARAM_SIZE,12)
        !            33: defframe(PARAM_SRC, 8)
        !            34: defframe(PARAM_DST, 4)
        !            35:
        !            36: PROLOGUE(mpn_copyd)
        !            37: deflit(`FRAME',0)
        !            38:
        !            39:        movl    PARAM_SRC, %eax
        !            40:        movl    PARAM_SIZE, %ecx
        !            41:
        !            42:        pushl   %esi    FRAME_pushl()
        !            43:        pushl   %edi    FRAME_pushl()
        !            44:
        !            45:        leal    -4(%eax,%ecx,4), %eax           C &src[size-1]
        !            46:        movl    PARAM_DST, %edx
        !            47:
        !            48:        subl    $7, %ecx                        C size-7
        !            49:        jle     L(end)
        !            50:
        !            51:        movl    28-4(%edx,%ecx,4), %esi         C prefetch cache, dst[size-1]
        !            52:        nop
        !            53:
        !            54: L(top):
        !            55:        C eax   src, decrementing
        !            56:        C ebx
        !            57:        C ecx   counter, limbs
        !            58:        C edx   dst
        !            59:        C esi   scratch
        !            60:        C edi   scratch
        !            61:        C ebp
        !            62:
        !            63:        movl    28-32(%edx,%ecx,4), %esi        C prefetch dst cache line
        !            64:        subl    $8, %ecx
        !            65:
        !            66:        movl    (%eax), %esi                    C read words pairwise
        !            67:        movl    -4(%eax), %edi
        !            68:        movl    %esi, 56(%edx,%ecx,4)           C store words pairwise
        !            69:        movl    %edi, 52(%edx,%ecx,4)
        !            70:
        !            71:        movl    -8(%eax), %esi
        !            72:        movl    -12(%eax), %edi
        !            73:        movl    %esi, 48(%edx,%ecx,4)
        !            74:        movl    %edi, 44(%edx,%ecx,4)
        !            75:
        !            76:        movl    -16(%eax), %esi
        !            77:        movl    -20(%eax), %edi
        !            78:        movl    %esi, 40(%edx,%ecx,4)
        !            79:        movl    %edi, 36(%edx,%ecx,4)
        !            80:
        !            81:        movl    -24(%eax), %esi
        !            82:        movl    -28(%eax), %edi
        !            83:        movl    %esi, 32(%edx,%ecx,4)
        !            84:        movl    %edi, 28(%edx,%ecx,4)
        !            85:
        !            86:        leal    -32(%eax), %eax
        !            87:        jg      L(top)
        !            88:
        !            89:
        !            90: L(end):
        !            91:        C ecx   -7 to 0, representing respectively 0 to 7 limbs remaining
        !            92:        C eax   src end
        !            93:        C edx   dst, next location to store
        !            94:
        !            95:        addl    $4, %ecx
        !            96:        jle     L(no4)
        !            97:
        !            98:        movl    (%eax), %esi
        !            99:        movl    -4(%eax), %edi
        !           100:        movl    %esi, 8(%edx,%ecx,4)
        !           101:        movl    %edi, 4(%edx,%ecx,4)
        !           102:
        !           103:        movl    -8(%eax), %esi
        !           104:        movl    -12(%eax), %edi
        !           105:        movl    %esi, (%edx,%ecx,4)
        !           106:        movl    %edi, -4(%edx,%ecx,4)
        !           107:
        !           108:        subl    $16, %eax
        !           109:        subl    $4, %ecx
        !           110: L(no4):
        !           111:
        !           112:        addl    $2, %ecx
        !           113:        jle     L(no2)
        !           114:
        !           115:        movl    (%eax), %esi
        !           116:        movl    -4(%eax), %edi
        !           117:        movl    %esi, (%edx,%ecx,4)
        !           118:        movl    %edi, -4(%edx,%ecx,4)
        !           119:
        !           120:        subl    $8, %eax
        !           121:        subl    $2, %ecx
        !           122: L(no2):
        !           123:
        !           124:        jnz     L(done)
        !           125:
        !           126:        movl    (%eax), %ecx
        !           127:        movl    %ecx, (%edx)    C risk of cache bank clash here
        !           128:
        !           129: L(done):
        !           130:        popl    %edi
        !           131:        popl    %esi
        !           132:
        !           133:        ret
        !           134:
        !           135: EPILOGUE()