1 dnl HP-PA 2.0 64-bit mpn_udiv_qrnnd_r.
3 dnl Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
5 dnl This file is part of the GNU MP Library.
7 dnl The GNU MP Library is free software; you can redistribute it and/or modify
8 dnl it under the terms of the GNU Lesser General Public License as published
9 dnl by the Free Software Foundation; either version 3 of the License, or (at
10 dnl your option) any later version.
12 dnl The GNU MP Library is distributed in the hope that it will be useful, but
13 dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 dnl License for more details.
17 dnl You should have received a copy of the GNU Lesser General Public License
18 dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
20 include(`../config.m4')
22 C This runs at about 280 cycles on both PA8000 and PA8500, corresponding to a
23 C bit more than 4 cycles/bit.
29 define(`remptr',`%r23')
49 ifdef(`HAVE_ABI_2_0w',
53 PROLOGUE(mpn_udiv_qrnnd_r)
54 ifdef(`HAVE_ABI_2_0n',
55 ` depd %r25,31,32,%r26
62 cmpib,*>= 0,d,L(large_divisor)
63 ldi 8,%r31 C setup loop counter
67 divstep divstep divstep divstep divstep divstep divstep divstep
68 addib,<> -1,%r31,L(Loop)
71 ifdef(`HAVE_ABI_2_0n',
73 extrd,u %r28,31,32,%r28
76 std n1,0(remptr) C store remainder
79 extrd,u n0,63,1,%r19 C save lsb of dividend
80 shrpd n1,n0,1,n0 C n0 = lo(n1n0 >> 1)
81 shrpd %r0,n1,1,n1 C n1 = hi(n1n0 >> 1)
82 extrd,u d,63,1,%r20 C save lsb of divisor
83 shrpd %r0,d,1,d C d = floor(orig_d / 2)
84 add,l %r20,d,d C d = ceil(orig_d / 2)
88 divstep divstep divstep divstep divstep divstep divstep divstep
89 addib,<> -1,%r31,L(Loop2)
92 cmpib,*= 0,%r20,L(even_divisor)
93 shladd n1,1,%r19,n1 C shift in omitted dividend lsb
95 add d,d,d C restore orig...
96 sub d,%r20,d C ...d value
97 sub %r0,d,dn C r21 = -d
99 add,*nuv n1,q,n1 C fix remainder for omitted divisor lsb
100 add,l n1,dn,n1 C adjust remainder if rem. fix carried
101 add,dc %r0,q,q C adjust quotient accordingly
103 sub,*<< n1,d,%r0 C remainder >= divisor?
104 add,l n1,dn,n1 C adjust remainder
105 add,dc %r0,q,q C adjust quotient
108 ifdef(`HAVE_ABI_2_0n',
110 extrd,u %r28,31,32,%r28
113 std n1,0(remptr) C store remainder
114 EPILOGUE(mpn_udiv_qrnnd_r)