gcc/config/alpha/qrnnd.asm

   1  # Alpha 21064 __udiv_qrnnd
   2  # Copyright (C) 1992, 1994, 1995, 2000 Free Software Foundation, Inc.
   3
   4  # This file is part of GCC.
   5
   6  # The GNU MP Library is free software; you can redistribute it and/or modify
   7  # it under the terms of the GNU General Public License as published by
   8  # the Free Software Foundation; either version 2 of the License, or (at your
   9  # option) any later version.
  10
  11  # In addition to the permissions in the GNU General Public License, the
  12  # Free Software Foundation gives you unlimited permission to link the
  13  # compiled version of this file with other programs, and to distribute
  14  # those programs without any restriction coming from the use of this
  15  # file.  (The General Public License restrictions do apply in other
  16  # respects; for example, they cover modification of the file, and
  17  # distribution when not linked into another program.)
  18
  19  # This file is distributed in the hope that it will be useful, but
  20  # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  21  # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
  22  # License for more details.
  23
  24  # You should have received a copy of the GNU General Public License
  25  # along with GCC; see the file COPYING.  If not, write to the
  26  # Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  27  # MA 02110-1301, USA.
  28
  29 #ifdef __ELF__
  30 .section .note.GNU-stack,""
  31 #endif
  32
  33         .set noreorder
  34         .set noat
  35
  36         .text
  37
  38         .globl __udiv_qrnnd
  39         .ent __udiv_qrnnd
  40 __udiv_qrnnd:
  41         .frame $30,0,$26,0
  42         .prologue 0
  43
  44 #define cnt     $2
  45 #define tmp     $3
  46 #define rem_ptr $16
  47 #define n1      $17
  48 #define n0      $18
  49 #define d       $19
  50 #define qb      $20
  51 #define AT      $at
  52
  53         ldiq    cnt,16
  54         blt     d,$largedivisor
  55
  56 $loop1: cmplt   n0,0,tmp
  57         addq    n1,n1,n1
  58         bis     n1,tmp,n1
  59         addq    n0,n0,n0
  60         cmpule  d,n1,qb
  61         subq    n1,d,tmp
  62         cmovne  qb,tmp,n1
  63         bis     n0,qb,n0
  64         cmplt   n0,0,tmp
  65         addq    n1,n1,n1
  66         bis     n1,tmp,n1
  67         addq    n0,n0,n0
  68         cmpule  d,n1,qb
  69         subq    n1,d,tmp
  70         cmovne  qb,tmp,n1
  71         bis     n0,qb,n0
  72         cmplt   n0,0,tmp
  73         addq    n1,n1,n1
  74         bis     n1,tmp,n1
  75         addq    n0,n0,n0
  76         cmpule  d,n1,qb
  77         subq    n1,d,tmp
  78         cmovne  qb,tmp,n1
  79         bis     n0,qb,n0
  80         cmplt   n0,0,tmp
  81         addq    n1,n1,n1
  82         bis     n1,tmp,n1
  83         addq    n0,n0,n0
  84         cmpule  d,n1,qb
  85         subq    n1,d,tmp
  86         cmovne  qb,tmp,n1
  87         bis     n0,qb,n0
  88         subq    cnt,1,cnt
  89         bgt     cnt,$loop1
  90         stq     n1,0(rem_ptr)
  91         bis     $31,n0,$0
  92         ret     $31,($26),1
  93
  94 $largedivisor:
  95         and     n0,1,$4
  96
  97         srl     n0,1,n0
  98         sll     n1,63,tmp
  99         or      tmp,n0,n0
 100         srl     n1,1,n1
 101
 102         and     d,1,$6
 103         srl     d,1,$5
 104         addq    $5,$6,$5
 105
 106 $loop2: cmplt   n0,0,tmp
 107         addq    n1,n1,n1
 108         bis     n1,tmp,n1
 109         addq    n0,n0,n0
 110         cmpule  $5,n1,qb
 111         subq    n1,$5,tmp
 112         cmovne  qb,tmp,n1
 113         bis     n0,qb,n0
 114         cmplt   n0,0,tmp
 115         addq    n1,n1,n1
 116         bis     n1,tmp,n1
 117         addq    n0,n0,n0
 118         cmpule  $5,n1,qb
 119         subq    n1,$5,tmp
 120         cmovne  qb,tmp,n1
 121         bis     n0,qb,n0
 122         cmplt   n0,0,tmp
 123         addq    n1,n1,n1
 124         bis     n1,tmp,n1
 125         addq    n0,n0,n0
 126         cmpule  $5,n1,qb
 127         subq    n1,$5,tmp
 128         cmovne  qb,tmp,n1
 129         bis     n0,qb,n0
 130         cmplt   n0,0,tmp
 131         addq    n1,n1,n1
 132         bis     n1,tmp,n1
 133         addq    n0,n0,n0
 134         cmpule  $5,n1,qb
 135         subq    n1,$5,tmp
 136         cmovne  qb,tmp,n1
 137         bis     n0,qb,n0
 138         subq    cnt,1,cnt
 139         bgt     cnt,$loop2
 140
 141         addq    n1,n1,n1
 142         addq    $4,n1,n1
 143         bne     $6,$Odd
 144         stq     n1,0(rem_ptr)
 145         bis     $31,n0,$0
 146         ret     $31,($26),1
 147
 148 $Odd:
 149         /* q' in n0. r' in n1 */
 150         addq    n1,n0,n1
 151
 152         cmpult  n1,n0,tmp       # tmp := carry from addq
 153         subq    n1,d,AT
 154         addq    n0,tmp,n0
 155         cmovne  tmp,AT,n1
 156
 157         cmpult  n1,d,tmp
 158         addq    n0,1,AT
 159         cmoveq  tmp,AT,n0
 160         subq    n1,d,AT
 161         cmoveq  tmp,AT,n1
 162
 163         stq     n1,0(rem_ptr)
 164         bis     $31,n0,$0
 165         ret     $31,($26),1
 166
 167         .end    __udiv_qrnnd