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Annotation of OpenXM_contrib/gmp/mpn/x86/k6/mmx/com_n.asm, Revision 1.1

1.1     ! maekawa     1: dnl  AMD K6-2 mpn_com_n -- mpn bitwise one's complement.
        !             2: dnl
        !             3: dnl     alignment dst/src, A=0mod8 N=4mod8
        !             4: dnl        A/A   A/N   N/A   N/N
        !             5: dnl  K6-2  1.0   1.18  1.18  1.18  cycles/limb
        !             6: dnl  K6    1.5   1.85  1.75  1.85
        !             7:
        !             8:
        !             9: dnl  Copyright (C) 1999, 2000 Free Software Foundation, Inc.
        !            10: dnl
        !            11: dnl  This file is part of the GNU MP Library.
        !            12: dnl
        !            13: dnl  The GNU MP Library is free software; you can redistribute it and/or
        !            14: dnl  modify it under the terms of the GNU Lesser General Public License as
        !            15: dnl  published by the Free Software Foundation; either version 2.1 of the
        !            16: dnl  License, or (at your option) any later version.
        !            17: dnl
        !            18: dnl  The GNU MP Library is distributed in the hope that it will be useful,
        !            19: dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            20: dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            21: dnl  Lesser General Public License for more details.
        !            22: dnl
        !            23: dnl  You should have received a copy of the GNU Lesser General Public
        !            24: dnl  License along with the GNU MP Library; see the file COPYING.LIB.  If
        !            25: dnl  not, write to the Free Software Foundation, Inc., 59 Temple Place -
        !            26: dnl  Suite 330, Boston, MA 02111-1307, USA.
        !            27:
        !            28:
        !            29: include(`../config.m4')
        !            30:
        !            31:
        !            32: C void mpn_com_n (mp_ptr dst, mp_srcptr src, mp_size_t size);
        !            33: C
        !            34: C Take the bitwise ones-complement of src,size and write it to dst,size.
        !            35:
        !            36: defframe(PARAM_SIZE,12)
        !            37: defframe(PARAM_SRC, 8)
        !            38: defframe(PARAM_DST, 4)
        !            39:
        !            40:        .text
        !            41:        ALIGN(32)
        !            42: PROLOGUE(mpn_com_n)
        !            43: deflit(`FRAME',0)
        !            44:
        !            45:        movl    PARAM_SIZE, %ecx
        !            46:        movl    PARAM_SRC, %eax
        !            47:        movl    PARAM_DST, %edx
        !            48:        shrl    %ecx
        !            49:        jnz     L(two_or_more)
        !            50:
        !            51:        movl    (%eax), %eax
        !            52:        notl    %eax
        !            53:        movl    %eax, (%edx)
        !            54:        ret
        !            55:
        !            56:
        !            57: L(two_or_more):
        !            58:        pushl   %ebx
        !            59: FRAME_pushl()
        !            60:        movl    %ecx, %ebx
        !            61:
        !            62:        pcmpeqd %mm7, %mm7      C all ones
        !            63:
        !            64:
        !            65:        ALIGN(16)
        !            66: L(top):
        !            67:        C eax   src
        !            68:        C ebx   floor(size/2)
        !            69:        C ecx   counter
        !            70:        C edx   dst
        !            71:        C esi
        !            72:        C edi
        !            73:        C ebp
        !            74:
        !            75:        movq    -8(%eax,%ecx,8), %mm0
        !            76:        pxor    %mm7, %mm0
        !            77:        movq    %mm0, -8(%edx,%ecx,8)
        !            78:        loop    L(top)
        !            79:
        !            80:
        !            81:        jnc     L(no_extra)
        !            82:        movl    (%eax,%ebx,8), %eax
        !            83:        notl    %eax
        !            84:        movl    %eax, (%edx,%ebx,8)
        !            85: L(no_extra):
        !            86:
        !            87:        popl    %ebx
        !            88:        emms_or_femms
        !            89:        ret
        !            90:
        !            91: EPILOGUE()