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glibc/ports/sysdeps/alpha/udiv_qrnnd.S
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# Alpha 21064 __udiv_qrnnd | |
# Copyright (C) 1992, 1994, 1995 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 Lesser General Public License as published by | |
# the Free Software Foundation; either version 2.1 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 Lesser General Public | |
# License for more details. | |
# You should have received a copy of the GNU Lesser General Public License | |
# along with the GNU MP Library. If not, see <http://www.gnu.org/licenses/>. | |
#include <sysdep.h> | |
.set noreorder | |
.set noat | |
.text | |
LEAF(__udiv_qrnnd, 0) | |
#ifdef PROF | |
ldgp gp, 0(pv) | |
lda AT, _mcount | |
jsr AT, (AT), _mcount | |
.prologue 1 | |
#else | |
.prologue 0 | |
#endif | |
#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 | |
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 |