| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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., 59 Temple Place - Suite 330, Boston, |
| 27 | # MA 02111-1307, USA. |
| 28 | |
| 29 | .set noreorder |
| 30 | .set noat |
| 31 | |
| 32 | .text |
| 33 | |
| 34 | .globl __udiv_qrnnd |
| 35 | .ent __udiv_qrnnd |
| 36 | __udiv_qrnnd: |
| 37 | .frame $30,0,$26,0 |
| 38 | .prologue 0 |
| 39 | |
| 40 | #define cnt $2 |
| 41 | #define tmp $3 |
| 42 | #define rem_ptr $16 |
| 43 | #define n1 $17 |
| 44 | #define n0 $18 |
| 45 | #define d $19 |
| 46 | #define qb $20 |
| 47 | #define AT $at |
| 48 | |
| 49 | ldiq cnt,16 |
| 50 | blt d,$largedivisor |
| 51 | |
| 52 | $loop1: cmplt n0,0,tmp |
| 53 | addq n1,n1,n1 |
| 54 | bis n1,tmp,n1 |
| 55 | addq n0,n0,n0 |
| 56 | cmpule d,n1,qb |
| 57 | subq n1,d,tmp |
| 58 | cmovne qb,tmp,n1 |
| 59 | bis n0,qb,n0 |
| 60 | cmplt n0,0,tmp |
| 61 | addq n1,n1,n1 |
| 62 | bis n1,tmp,n1 |
| 63 | addq n0,n0,n0 |
| 64 | cmpule d,n1,qb |
| 65 | subq n1,d,tmp |
| 66 | cmovne qb,tmp,n1 |
| 67 | bis n0,qb,n0 |
| 68 | cmplt n0,0,tmp |
| 69 | addq n1,n1,n1 |
| 70 | bis n1,tmp,n1 |
| 71 | addq n0,n0,n0 |
| 72 | cmpule d,n1,qb |
| 73 | subq n1,d,tmp |
| 74 | cmovne qb,tmp,n1 |
| 75 | bis n0,qb,n0 |
| 76 | cmplt n0,0,tmp |
| 77 | addq n1,n1,n1 |
| 78 | bis n1,tmp,n1 |
| 79 | addq n0,n0,n0 |
| 80 | cmpule d,n1,qb |
| 81 | subq n1,d,tmp |
| 82 | cmovne qb,tmp,n1 |
| 83 | bis n0,qb,n0 |
| 84 | subq cnt,1,cnt |
| 85 | bgt cnt,$loop1 |
| 86 | stq n1,0(rem_ptr) |
| 87 | bis $31,n0,$0 |
| 88 | ret $31,($26),1 |
| 89 | |
| 90 | $largedivisor: |
| 91 | and n0,1,$4 |
| 92 | |
| 93 | srl n0,1,n0 |
| 94 | sll n1,63,tmp |
| 95 | or tmp,n0,n0 |
| 96 | srl n1,1,n1 |
| 97 | |
| 98 | and d,1,$6 |
| 99 | srl d,1,$5 |
| 100 | addq $5,$6,$5 |
| 101 | |
| 102 | $loop2: cmplt n0,0,tmp |
| 103 | addq n1,n1,n1 |
| 104 | bis n1,tmp,n1 |
| 105 | addq n0,n0,n0 |
| 106 | cmpule $5,n1,qb |
| 107 | subq n1,$5,tmp |
| 108 | cmovne qb,tmp,n1 |
| 109 | bis n0,qb,n0 |
| 110 | cmplt n0,0,tmp |
| 111 | addq n1,n1,n1 |
| 112 | bis n1,tmp,n1 |
| 113 | addq n0,n0,n0 |
| 114 | cmpule $5,n1,qb |
| 115 | subq n1,$5,tmp |
| 116 | cmovne qb,tmp,n1 |
| 117 | bis n0,qb,n0 |
| 118 | cmplt n0,0,tmp |
| 119 | addq n1,n1,n1 |
| 120 | bis n1,tmp,n1 |
| 121 | addq n0,n0,n0 |
| 122 | cmpule $5,n1,qb |
| 123 | subq n1,$5,tmp |
| 124 | cmovne qb,tmp,n1 |
| 125 | bis n0,qb,n0 |
| 126 | cmplt n0,0,tmp |
| 127 | addq n1,n1,n1 |
| 128 | bis n1,tmp,n1 |
| 129 | addq n0,n0,n0 |
| 130 | cmpule $5,n1,qb |
| 131 | subq n1,$5,tmp |
| 132 | cmovne qb,tmp,n1 |
| 133 | bis n0,qb,n0 |
| 134 | subq cnt,1,cnt |
| 135 | bgt cnt,$loop2 |
| 136 | |
| 137 | addq n1,n1,n1 |
| 138 | addq $4,n1,n1 |
| 139 | bne $6,$Odd |
| 140 | stq n1,0(rem_ptr) |
| 141 | bis $31,n0,$0 |
| 142 | ret $31,($26),1 |
| 143 | |
| 144 | $Odd: |
| 145 | /* q' in n0. r' in n1 */ |
| 146 | addq n1,n0,n1 |
| 147 | |
| 148 | cmpult n1,n0,tmp # tmp := carry from addq |
| 149 | subq n1,d,AT |
| 150 | addq n0,tmp,n0 |
| 151 | cmovne tmp,AT,n1 |
| 152 | |
| 153 | cmpult n1,d,tmp |
| 154 | addq n0,1,AT |
| 155 | cmoveq tmp,AT,n0 |
| 156 | subq n1,d,AT |
| 157 | cmoveq tmp,AT,n1 |
| 158 | |
| 159 | stq n1,0(rem_ptr) |
| 160 | bis $31,n0,$0 |
| 161 | ret $31,($26),1 |
| 162 | |
| 163 | .end __udiv_qrnnd |