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Annotation of OpenXM_contrib/gmp/mpn/x86/rshift.S, Revision 1.1.1.1

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