kernel/FPU-emu/poly

/* */
   1 /*---------------------------------------------------------------------------+
   2  |  poly_mul64.S                                                             |
   3  |                                                                           |
   4  | Multiply two 64 bit integers.                                             |
   5  |                                                                           |
   6  | Copyright (C) 1992    W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
   7  |                       Australia.  E-mail apm233m@vaxc.cc.monash.edu.au    |
   8  |                                                                           |
   9  | Call from C as:                                                           |
  10  |   void mul64(long long *a, long long *b, long long *result)               |
  11  |                                                                           |
  12  +---------------------------------------------------------------------------*/
  13 
  14 
  15 #include "fpu_asm.h"
  16 
  17 .text
  18         .align 2,144
  19 .globl _mul64
  20 _mul64:
  21         pushl %ebp
  22         movl %esp,%ebp
  23         subl $16,%esp
  24         pushl %esi
  25         pushl %ebx
  26 
  27         movl PARAM1,%esi
  28         movl PARAM2,%ecx
  29         movl PARAM3,%ebx
  30 
  31         xor %eax,%eax
  32         movl %eax,-4(%ebp)
  33         movl %eax,-8(%ebp)
  34 
  35         movl (%esi),%eax
  36         mull (%ecx)
  37         movl %eax,-16(%ebp)     // Not used
  38         movl %edx,-12(%ebp)
  39 
  40         movl (%esi),%eax
  41         mull 4(%ecx)
  42         addl %eax,-12(%ebp)
  43         adcl %edx,-8(%ebp)
  44         adcl $0,-4(%ebp)
  45 
  46         movl 4(%esi),%eax
  47         mull (%ecx)
  48         addl %eax,-12(%ebp)
  49         adcl %edx,-8(%ebp)
  50         adcl $0,-4(%ebp)
  51 
  52         movl 4(%esi),%eax
  53         mull 4(%ecx)
  54         addl %eax,-8(%ebp)
  55         adcl %edx,-4(%ebp)
  56 
  57         testb $128,-9(%ebp)
  58         je L_no_round
  59 
  60         addl $1,-8(%ebp)
  61         adcl $0,-4(%ebp)
  62 
  63 L_no_round:
  64         movl -8(%ebp),%esi
  65         movl %esi,(%ebx)
  66         movl -4(%ebp),%esi
  67         movl %esi,4(%ebx)
  68 
  69         popl %ebx
  70         popl %esi
  71         leave
  72         ret
/* */
root/kernel/FPU-emu/poly_mul64.S
