arch/i386/math-emu/mul_Xsig.S

   1 /*---------------------------------------------------------------------------+
   2  |  mul_Xsig.S                                                               |
   3  |                                                                           |
   4  | Multiply a 12 byte fixed point number by another fixed point number.      |
   5  |                                                                           |
   6  | Copyright (C) 1992,1994,1995                                              |
   7  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
   8  |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
   9  |                                                                           |
  10  | Call from C as:                                                           |
  11  |   void mul32_Xsig(Xsig *x, unsigned b)                                    |
  12  |                                                                           |
  13  |   void mul64_Xsig(Xsig *x, unsigned long long *b)                         |
  14  |                                                                           |
  15  |   void mul_Xsig_Xsig(Xsig *x, unsigned *b)                                |
  16  |                                                                           |
  17  | The result is neither rounded nor normalized, and the ls bit or so may    |
  18  | be wrong.                                                                 |
  19  |                                                                           |
  20  +---------------------------------------------------------------------------*/
  21         .file   "mul_Xsig.S"
  22
  23
  24 #include "fpu_emu.h"
  25
  26 .text
  27 ENTRY(mul32_Xsig)
  28         pushl %ebp
  29         movl %esp,%ebp
  30         subl $16,%esp
  31         pushl %esi
  32
  33         movl PARAM1,%esi
  34         movl PARAM2,%ecx
  35
  36         xor %eax,%eax
  37         movl %eax,-4(%ebp)
  38         movl %eax,-8(%ebp)
  39
  40         movl (%esi),%eax        /* lsl of Xsig */
  41         mull %ecx               /* msl of b */
  42         movl %edx,-12(%ebp)
  43
  44         movl 4(%esi),%eax       /* midl of Xsig */
  45         mull %ecx               /* msl of b */
  46         addl %eax,-12(%ebp)
  47         adcl %edx,-8(%ebp)
  48         adcl $0,-4(%ebp)
  49
  50         movl 8(%esi),%eax       /* msl of Xsig */
  51         mull %ecx               /* msl of b */
  52         addl %eax,-8(%ebp)
  53         adcl %edx,-4(%ebp)
  54
  55         movl -12(%ebp),%eax
  56         movl %eax,(%esi)
  57         movl -8(%ebp),%eax
  58         movl %eax,4(%esi)
  59         movl -4(%ebp),%eax
  60         movl %eax,8(%esi)
  61
  62         popl %esi
  63         leave
  64         ret
  65
  66
  67 ENTRY(mul64_Xsig)
  68         pushl %ebp
  69         movl %esp,%ebp
  70         subl $16,%esp
  71         pushl %esi
  72
  73         movl PARAM1,%esi
  74         movl PARAM2,%ecx
  75
  76         xor %eax,%eax
  77         movl %eax,-4(%ebp)
  78         movl %eax,-8(%ebp)
  79
  80         movl (%esi),%eax        /* lsl of Xsig */
  81         mull 4(%ecx)            /* msl of b */
  82         movl %edx,-12(%ebp)
  83
  84         movl 4(%esi),%eax       /* midl of Xsig */
  85         mull (%ecx)             /* lsl of b */
  86         addl %edx,-12(%ebp)
  87         adcl $0,-8(%ebp)
  88         adcl $0,-4(%ebp)
  89
  90         movl 4(%esi),%eax       /* midl of Xsig */
  91         mull 4(%ecx)            /* msl of b */
  92         addl %eax,-12(%ebp)
  93         adcl %edx,-8(%ebp)
  94         adcl $0,-4(%ebp)
  95
  96         movl 8(%esi),%eax       /* msl of Xsig */
  97         mull (%ecx)             /* lsl of b */
  98         addl %eax,-12(%ebp)
  99         adcl %edx,-8(%ebp)
 100         adcl $0,-4(%ebp)
 101
 102         movl 8(%esi),%eax       /* msl of Xsig */
 103         mull 4(%ecx)            /* msl of b */
 104         addl %eax,-8(%ebp)
 105         adcl %edx,-4(%ebp)
 106
 107         movl -12(%ebp),%eax
 108         movl %eax,(%esi)
 109         movl -8(%ebp),%eax
 110         movl %eax,4(%esi)
 111         movl -4(%ebp),%eax
 112         movl %eax,8(%esi)
 113
 114         popl %esi
 115         leave
 116         ret
 117
 118
 119
 120 ENTRY(mul_Xsig_Xsig)
 121         pushl %ebp
 122         movl %esp,%ebp
 123         subl $16,%esp
 124         pushl %esi
 125
 126         movl PARAM1,%esi
 127         movl PARAM2,%ecx
 128
 129         xor %eax,%eax
 130         movl %eax,-4(%ebp)
 131         movl %eax,-8(%ebp)
 132
 133         movl (%esi),%eax        /* lsl of Xsig */
 134         mull 8(%ecx)            /* msl of b */
 135         movl %edx,-12(%ebp)
 136
 137         movl 4(%esi),%eax       /* midl of Xsig */
 138         mull 4(%ecx)            /* midl of b */
 139         addl %edx,-12(%ebp)
 140         adcl $0,-8(%ebp)
 141         adcl $0,-4(%ebp)
 142
 143         movl 8(%esi),%eax       /* msl of Xsig */
 144         mull (%ecx)             /* lsl of b */
 145         addl %edx,-12(%ebp)
 146         adcl $0,-8(%ebp)
 147         adcl $0,-4(%ebp)
 148
 149         movl 4(%esi),%eax       /* midl of Xsig */
 150         mull 8(%ecx)            /* msl of b */
 151         addl %eax,-12(%ebp)
 152         adcl %edx,-8(%ebp)
 153         adcl $0,-4(%ebp)
 154
 155         movl 8(%esi),%eax       /* msl of Xsig */
 156         mull 4(%ecx)            /* midl of b */
 157         addl %eax,-12(%ebp)
 158         adcl %edx,-8(%ebp)
 159         adcl $0,-4(%ebp)
 160
 161         movl 8(%esi),%eax       /* msl of Xsig */
 162         mull 8(%ecx)            /* msl of b */
 163         addl %eax,-8(%ebp)
 164         adcl %edx,-4(%ebp)
 165
 166         movl -12(%ebp),%edx
 167         movl %edx,(%esi)
 168         movl -8(%ebp),%edx
 169         movl %edx,4(%esi)
 170         movl -4(%ebp),%edx
 171         movl %edx,8(%esi)
 172
 173         popl %esi
 174         leave
 175         ret
 176