sysdeps/alpha/udiv_qrnnd.S

   1  # Alpha 21064 __udiv_qrnnd
   2
   3  # Copyright (C) 1992, 1994, 1995 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 #include <sysdep.h>
  23
  24         .set noreorder
  25         .set noat
  26
  27         .text
  28
  29 LEAF(__udiv_qrnnd, 0)
  30 #ifdef PROF
  31         ldgp    gp, 0(pv)
  32         lda     AT, _mcount
  33         jsr     AT, (AT), _mcount
  34         .prologue 1
  35 #else
  36         .prologue 0
  37 #endif
  38
  39 #define cnt     $2
  40 #define tmp     $3
  41 #define rem_ptr $16
  42 #define n1      $17
  43 #define n0      $18
  44 #define d       $19
  45 #define qb      $20
  46
  47         ldiq    cnt,16
  48         blt     d,$largedivisor
  49
  50 $loop1: cmplt   n0,0,tmp
  51         addq    n1,n1,n1
  52         bis     n1,tmp,n1
  53         addq    n0,n0,n0
  54         cmpule  d,n1,qb
  55         subq    n1,d,tmp
  56         cmovne  qb,tmp,n1
  57         bis     n0,qb,n0
  58         cmplt   n0,0,tmp
  59         addq    n1,n1,n1
  60         bis     n1,tmp,n1
  61         addq    n0,n0,n0
  62         cmpule  d,n1,qb
  63         subq    n1,d,tmp
  64         cmovne  qb,tmp,n1
  65         bis     n0,qb,n0
  66         cmplt   n0,0,tmp
  67         addq    n1,n1,n1
  68         bis     n1,tmp,n1
  69         addq    n0,n0,n0
  70         cmpule  d,n1,qb
  71         subq    n1,d,tmp
  72         cmovne  qb,tmp,n1
  73         bis     n0,qb,n0
  74         cmplt   n0,0,tmp
  75         addq    n1,n1,n1
  76         bis     n1,tmp,n1
  77         addq    n0,n0,n0
  78         cmpule  d,n1,qb
  79         subq    n1,d,tmp
  80         cmovne  qb,tmp,n1
  81         bis     n0,qb,n0
  82         subq    cnt,1,cnt
  83         bgt     cnt,$loop1
  84         stq     n1,0(rem_ptr)
  85         bis     $31,n0,$0
  86         ret     $31,($26),1
  87
  88 $largedivisor:
  89         and     n0,1,$4
  90
  91         srl     n0,1,n0
  92         sll     n1,63,tmp
  93         or      tmp,n0,n0
  94         srl     n1,1,n1
  95
  96         and     d,1,$6
  97         srl     d,1,$5
  98         addq    $5,$6,$5
  99
 100 $loop2: cmplt   n0,0,tmp
 101         addq    n1,n1,n1
 102         bis     n1,tmp,n1
 103         addq    n0,n0,n0
 104         cmpule  $5,n1,qb
 105         subq    n1,$5,tmp
 106         cmovne  qb,tmp,n1
 107         bis     n0,qb,n0
 108         cmplt   n0,0,tmp
 109         addq    n1,n1,n1
 110         bis     n1,tmp,n1
 111         addq    n0,n0,n0
 112         cmpule  $5,n1,qb
 113         subq    n1,$5,tmp
 114         cmovne  qb,tmp,n1
 115         bis     n0,qb,n0
 116         cmplt   n0,0,tmp
 117         addq    n1,n1,n1
 118         bis     n1,tmp,n1
 119         addq    n0,n0,n0
 120         cmpule  $5,n1,qb
 121         subq    n1,$5,tmp
 122         cmovne  qb,tmp,n1
 123         bis     n0,qb,n0
 124         cmplt   n0,0,tmp
 125         addq    n1,n1,n1
 126         bis     n1,tmp,n1
 127         addq    n0,n0,n0
 128         cmpule  $5,n1,qb
 129         subq    n1,$5,tmp
 130         cmovne  qb,tmp,n1
 131         bis     n0,qb,n0
 132         subq    cnt,1,cnt
 133         bgt     cnt,$loop2
 134
 135         addq    n1,n1,n1
 136         addq    $4,n1,n1
 137         bne     $6,$Odd
 138         stq     n1,0(rem_ptr)
 139         bis     $31,n0,$0
 140         ret     $31,($26),1
 141
 142 $Odd:
 143         /* q' in n0. r' in n1 */
 144         addq    n1,n0,n1
 145
 146         cmpult  n1,n0,tmp       # tmp := carry from addq
 147         subq    n1,d,AT
 148         addq    n0,tmp,n0
 149         cmovne  tmp,AT,n1
 150
 151         cmpult  n1,d,tmp
 152         addq    n0,1,AT
 153         cmoveq  tmp,AT,n0
 154         subq    n1,d,AT
 155         cmoveq  tmp,AT,n1
 156
 157         stq     n1,0(rem_ptr)
 158         bis     $31,n0,$0
 159         ret     $31,($26),1
 160
 161         .end    __udiv_qrnnd