/* AMD64 __mpn_rshift --
   Copyright (C) 2004, 2006 Free Software Foundation, Inc.
   This file is part of the GNU MP Library.

   The GNU MP Library is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 of the License, or (at your
   option) any later version.

   The GNU MP Library is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
   License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA. */

#include "sysdep.h"
#include "asm-syntax.h"

        .text
ENTRY (__mpn_rshift)
        movq    (%rsi), %mm7
        movd    %ecx, %mm1
        movl    $64, %eax
        subl    %ecx, %eax
        movd    %eax, %mm0
        movq    %mm7, %mm3
        psllq   %mm0, %mm7
        movd    %mm7, %rax
        leaq    (%rsi,%rdx,8), %rsi
        leaq    (%rdi,%rdx,8), %rdi
        negq    %rdx
        addq    $2, %rdx
        jg      L(endo)
        .p2align 2
L(loop):
        movq    -8(%rsi,%rdx,8), %mm6
        movq    %mm6, %mm2
        psllq   %mm0, %mm6
        psrlq   %mm1, %mm3
        por     %mm6, %mm3
        movq    %mm3, -16(%rdi,%rdx,8)
        je      L(ende)
        movq    (%rsi,%rdx,8), %mm7
        movq    %mm7, %mm3
        psllq   %mm0, %mm7
        psrlq   %mm1, %mm2
        por     %mm7, %mm2
        movq    %mm2, -8(%rdi,%rdx,8)
        addq    $2, %rdx
        jle     L(loop)
L(endo):
        movq    %mm3, %mm2
L(ende):
        psrlq   %mm1, %mm2
        movq    %mm2, -8(%rdi)
        emms
        ret
END (__mpn_rshift)