dnl HP-PA __udiv_qrnnd division support, used from longlong.h.
dnl This version runs fast on pre-PA7000 CPUs.
dnl Copyright 1993, 1994, 2000-2002 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C INPUT PARAMETERS
C rem_ptr gr26
C n1 gr25
C n0 gr24
C d gr23
C The code size is a bit excessive. We could merge the last two ds;addc
C sequences by simply moving the "bb,< Odd" instruction down. The only
C trouble is the FFFFFFFF code that would need some hacking.
ASM_START()
PROLOGUE(mpn_udiv_qrnnd)
comb,< %r23,0,L(largedivisor)
sub %r0,%r23,%r1 C clear cy as side-effect
ds %r0,%r1,%r0
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r28
ds %r25,%r23,%r25
comclr,>= %r25,%r0,%r0
addl %r25,%r23,%r25
stws %r25,0(0,%r26)
bv 0(%r2)
addc %r28,%r28,%r28
LDEF(largedivisor)
extru %r24,31,1,%r19 C r19 = n0 & 1
bb,< %r23,31,L(odd)
extru %r23,30,31,%r22 C r22 = d >> 1
shd %r25,%r24,1,%r24 C r24 = new n0
extru %r25,30,31,%r25 C r25 = new n1
sub %r0,%r22,%r21
ds %r0,%r21,%r0
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
comclr,>= %r25,%r0,%r0
addl %r25,%r22,%r25
sh1addl %r25,%r19,%r25
stws %r25,0(0,%r26)
bv 0(%r2)
addc %r24,%r24,%r28
LDEF(odd)
addib,sv,n 1,%r22,L(FFFFFFFF) C r22 = (d / 2 + 1)
shd %r25,%r24,1,%r24 C r24 = new n0
extru %r25,30,31,%r25 C r25 = new n1
sub %r0,%r22,%r21
ds %r0,%r21,%r0
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r28
comclr,>= %r25,%r0,%r0
addl %r25,%r22,%r25
sh1addl %r25,%r19,%r25
C We have computed (n1,,n0) / (d + 1), q' = r28, r' = r25
add,nuv %r28,%r25,%r25
addl %r25,%r1,%r25
addc %r0,%r28,%r28
sub,<< %r25,%r23,%r0
addl %r25,%r1,%r25
stws %r25,0(0,%r26)
bv 0(%r2)
addc %r0,%r28,%r28
C This is just a special case of the code above.
C We come here when d == 0xFFFFFFFF
LDEF(FFFFFFFF)
add,uv %r25,%r24,%r24
sub,<< %r24,%r23,%r0
ldo 1(%r24),%r24
stws %r24,0(0,%r26)
bv 0(%r2)
addc %r0,%r25,%r28
EPILOGUE()