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Annotation of OpenXM/src/kan96xx/gmp-2.0.2/mpn/x86/lshift.S, Revision 1.1.1.1

1.1       maekawa     1: /* i80386 __mpn_lshift --
                      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_lshift)
                     36: C_SYMBOL_NAME(__mpn_lshift:)
                     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:        subl    $4,%esi                 /* adjust s_ptr */
                     47:
                     48:        movl    (%esi,%edx,4),%ebx      /* read most significant limb */
                     49:        xorl    %eax,%eax
                     50:        shldl   %cl,%ebx,%eax           /* compute carry limb */
                     51:        decl    %edx
                     52:        jz      Lend
                     53:        pushl   %eax                    /* push carry limb onto stack */
                     54:        testb   $1,%edx
                     55:        jnz     L1                      /* enter loop in the middle */
                     56:        movl    %ebx,%eax
                     57:
                     58:        ALIGN (3)
                     59: Loop:  movl    (%esi,%edx,4),%ebx      /* load next lower limb */
                     60:        shldl   %cl,%ebx,%eax           /* compute result limb */
                     61:        movl    %eax,(%edi,%edx,4)      /* store it */
                     62:        decl    %edx
                     63: L1:    movl    (%esi,%edx,4),%eax
                     64:        shldl   %cl,%eax,%ebx
                     65:        movl    %ebx,(%edi,%edx,4)
                     66:        decl    %edx
                     67:        jnz     Loop
                     68:
                     69:        shll    %cl,%eax                /* compute least significant limb */
                     70:        movl    %eax,(%edi)             /* store it */
                     71:
                     72:        popl    %eax                    /* pop carry limb */
                     73:
                     74:        popl    %ebx
                     75:        popl    %esi
                     76:        popl    %edi
                     77:        ret
                     78:
                     79: Lend:  shll    %cl,%ebx                /* compute least significant limb */
                     80:        movl    %ebx,(%edi)             /* store it */
                     81:
                     82:        popl    %ebx
                     83:        popl    %esi
                     84:        popl    %edi
                     85:        ret