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Diffstat (limited to 'arch/alpha/lib/udiv-qrnnd.S')
| -rw-r--r-- | arch/alpha/lib/udiv-qrnnd.S | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/arch/alpha/lib/udiv-qrnnd.S b/arch/alpha/lib/udiv-qrnnd.S new file mode 100644 index 000000000000..b887aa5428e5 --- /dev/null +++ b/arch/alpha/lib/udiv-qrnnd.S @@ -0,0 +1,165 @@ + # Alpha 21064 __udiv_qrnnd + # Copyright (C) 1992, 1994, 1995, 2000 Free Software Foundation, Inc. + + # This file is part of GCC. + + # The GNU MP Library is free software; you can redistribute it and/or modify + # it under the terms of the GNU General Public License as published by + # the Free Software Foundation; either version 2 of the License, or (at your + # option) any later version. + + # In addition to the permissions in the GNU General Public License, the + # Free Software Foundation gives you unlimited permission to link the + # compiled version of this file with other programs, and to distribute + # those programs without any restriction coming from the use of this + # file. (The General Public License restrictions do apply in other + # respects; for example, they cover modification of the file, and + # distribution when not linked into another program.) + + # This file is distributed in the hope that it will be useful, but + # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public + # License for more details. + + # You should have received a copy of the GNU General Public License + # along with GCC; see the file COPYING. If not, write to the + # Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + # MA 02111-1307, USA. +#include <asm/export.h> + + .set noreorder + .set noat + + .text + + .globl __udiv_qrnnd + .ent __udiv_qrnnd +__udiv_qrnnd: + .frame $30,0,$26,0 + .prologue 0 + +#define cnt $2 +#define tmp $3 +#define rem_ptr $16 +#define n1 $17 +#define n0 $18 +#define d $19 +#define qb $20 +#define AT $at + + ldiq cnt,16 + blt d,$largedivisor + +$loop1: cmplt n0,0,tmp + addq n1,n1,n1 + bis n1,tmp,n1 + addq n0,n0,n0 + cmpule d,n1,qb + subq n1,d,tmp + cmovne qb,tmp,n1 + bis n0,qb,n0 + cmplt n0,0,tmp + addq n1,n1,n1 + bis n1,tmp,n1 + addq n0,n0,n0 + cmpule d,n1,qb + subq n1,d,tmp + cmovne qb,tmp,n1 + bis n0,qb,n0 + cmplt n0,0,tmp + addq n1,n1,n1 + bis n1,tmp,n1 + addq n0,n0,n0 + cmpule d,n1,qb + subq n1,d,tmp + cmovne qb,tmp,n1 + bis n0,qb,n0 + cmplt n0,0,tmp + addq n1,n1,n1 + bis n1,tmp,n1 + addq n0,n0,n0 + cmpule d,n1,qb + subq n1,d,tmp + cmovne qb,tmp,n1 + bis n0,qb,n0 + subq cnt,1,cnt + bgt cnt,$loop1 + stq n1,0(rem_ptr) + bis $31,n0,$0 + ret $31,($26),1 + +$largedivisor: + and n0,1,$4 + + srl n0,1,n0 + sll n1,63,tmp + or tmp,n0,n0 + srl n1,1,n1 + + and d,1,$6 + srl d,1,$5 + addq $5,$6,$5 + +$loop2: cmplt n0,0,tmp + addq n1,n1,n1 + bis n1,tmp,n1 + addq n0,n0,n0 + cmpule $5,n1,qb + subq n1,$5,tmp + cmovne qb,tmp,n1 + bis n0,qb,n0 + cmplt n0,0,tmp + addq n1,n1,n1 + bis n1,tmp,n1 + addq n0,n0,n0 + cmpule $5,n1,qb + subq n1,$5,tmp + cmovne qb,tmp,n1 + bis n0,qb,n0 + cmplt n0,0,tmp + addq n1,n1,n1 + bis n1,tmp,n1 + addq n0,n0,n0 + cmpule $5,n1,qb + subq n1,$5,tmp + cmovne qb,tmp,n1 + bis n0,qb,n0 + cmplt n0,0,tmp + addq n1,n1,n1 + bis n1,tmp,n1 + addq n0,n0,n0 + cmpule $5,n1,qb + subq n1,$5,tmp + cmovne qb,tmp,n1 + bis n0,qb,n0 + subq cnt,1,cnt + bgt cnt,$loop2 + + addq n1,n1,n1 + addq $4,n1,n1 + bne $6,$Odd + stq n1,0(rem_ptr) + bis $31,n0,$0 + ret $31,($26),1 + +$Odd: + /* q' in n0. r' in n1 */ + addq n1,n0,n1 + + cmpult n1,n0,tmp # tmp := carry from addq + subq n1,d,AT + addq n0,tmp,n0 + cmovne tmp,AT,n1 + + cmpult n1,d,tmp + addq n0,1,AT + cmoveq tmp,AT,n0 + subq n1,d,AT + cmoveq tmp,AT,n1 + + stq n1,0(rem_ptr) + bis $31,n0,$0 + ret $31,($26),1 + + .end __udiv_qrnnd +EXPORT_SYMBOL(__udiv_qrnnd) |