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Annotation of OpenXM_contrib/gmp/mpn/x86/rshift.S, Revision 1.1

1.1     ! maekawa     1: /* i80386 __mpn_rshift --
        !             2:
        !             3: Copyright (C) 1992, 1994 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the GNU MP Library.
        !             6:
        !             7: The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library General Public License
        !            18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: /*
        !            23:   INPUT PARAMETERS
        !            24:   res_ptr      (sp + 4)
        !            25:   s_ptr                (sp + 8)
        !            26:   size         (sp + 12)
        !            27:   cnt          (sp + 16)
        !            28: */
        !            29:
        !            30: #include "sysdep.h"
        !            31: #include "asm-syntax.h"
        !            32:
        !            33: .text
        !            34:        ALIGN (3)
        !            35:        .globl C_SYMBOL_NAME(__mpn_rshift)
        !            36: C_SYMBOL_NAME(__mpn_rshift:)
        !            37:        pushl   %edi
        !            38:        pushl   %esi
        !            39:        pushl   %ebx
        !            40:
        !            41:        movl    16(%esp),%edi           /* res_ptr */
        !            42:        movl    20(%esp),%esi           /* s_ptr */
        !            43:        movl    24(%esp),%edx           /* size */
        !            44:        movl    28(%esp),%ecx           /* cnt */
        !            45:
        !            46:        leal    -4(%edi,%edx,4),%edi
        !            47:        leal    (%esi,%edx,4),%esi
        !            48:        negl    %edx
        !            49:
        !            50:        movl    (%esi,%edx,4),%ebx      /* read least significant limb */
        !            51:        xorl    %eax,%eax
        !            52:        shrdl   %cl,%ebx,%eax           /* compute carry limb */
        !            53:        incl    %edx
        !            54:        jz      Lend
        !            55:        pushl   %eax                    /* push carry limb onto stack */
        !            56:        testb   $1,%edx
        !            57:        jnz     L1                      /* enter loop in the middle */
        !            58:        movl    %ebx,%eax
        !            59:
        !            60:        ALIGN (3)
        !            61: Loop:  movl    (%esi,%edx,4),%ebx      /* load next higher limb */
        !            62:        shrdl   %cl,%ebx,%eax           /* compute result limb */
        !            63:        movl    %eax,(%edi,%edx,4)      /* store it */
        !            64:        incl    %edx
        !            65: L1:    movl    (%esi,%edx,4),%eax
        !            66:        shrdl   %cl,%eax,%ebx
        !            67:        movl    %ebx,(%edi,%edx,4)
        !            68:        incl    %edx
        !            69:        jnz     Loop
        !            70:
        !            71:        shrl    %cl,%eax                /* compute most significant limb */
        !            72:        movl    %eax,(%edi)             /* store it */
        !            73:
        !            74:        popl    %eax                    /* pop carry limb */
        !            75:
        !            76:        popl    %ebx
        !            77:        popl    %esi
        !            78:        popl    %edi
        !            79:        ret
        !            80:
        !            81: Lend:  shrl    %cl,%ebx                /* compute most significant limb */
        !            82:        movl    %ebx,(%edi)             /* store it */
        !            83:
        !            84:        popl    %ebx
        !            85:        popl    %esi
        !            86:        popl    %edi
        !            87:        ret