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Diffstat (limited to 'sysdeps/alpha/udiv_qrnnd.S')
| -rw-r--r-- | sysdeps/alpha/udiv_qrnnd.S | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/sysdeps/alpha/udiv_qrnnd.S b/sysdeps/alpha/udiv_qrnnd.S new file mode 100644 index 0000000000..942d7a884b --- /dev/null +++ b/sysdeps/alpha/udiv_qrnnd.S @@ -0,0 +1,152 @@ + # Alpha 21064 __udiv_qrnnd + + # Copyright (C) 1992, 1994 Free Software Foundation, Inc. + + # This file is part of the GNU MP Library. + + # The GNU MP Library is free software; you can redistribute it and/or modify + # it under the terms of the GNU Library General Public License as published by + # the Free Software Foundation; either version 2 of the License, or (at your + # option) any later version. + + # The GNU MP Library 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 Library General Public License + # along with the GNU MP Library; see the file COPYING.LIB. If not, write to + # the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + + .set noreorder + .set noat + +.text + .align 3 + .globl __udiv_qrnnd + .ent __udiv_qrnnd 0 +__udiv_qrnnd: +__udiv_qrnnd..ng: + .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 + + 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 + beq tmp,LLp6 + addq n0,1,n0 + subq n1,d,n1 +LLp6: cmpult n1,d,tmp + bne tmp,LLp7 + addq n0,1,n0 + subq n1,d,n1 +LLp7: + stq n1,0(rem_ptr) + bis $31,n0,$0 + ret $31,($26),1 + + .end __udiv_qrnnd |