mpir/mpn/sparc32/udiv_nfp.asm

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dnl SPARC v7 __udiv_qrnnd division support, used from longlong.h.
dnl This is for v7 CPUs without a floating-point unit.
dnl Copyright 1993, 1994, 1996, 2000 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 2.1 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
dnl Boston, MA 02110-1301, USA.
include(`../config.m4')
C INPUT PARAMETERS
C rem_ptr o0
C n1 o1
C n0 o2
C d o3
ASM_START()
PROLOGUE(mpn_udiv_qrnnd)
tst %o3
bneg L(largedivisor)
mov 8,%g1
b L(p1)
addxcc %o2,%o2,%o2
L(plop):
bcc L(n1)
addxcc %o2,%o2,%o2
L(p1): addx %o1,%o1,%o1
subcc %o1,%o3,%o4
bcc L(n2)
addxcc %o2,%o2,%o2
L(p2): addx %o1,%o1,%o1
subcc %o1,%o3,%o4
bcc L(n3)
addxcc %o2,%o2,%o2
L(p3): addx %o1,%o1,%o1
subcc %o1,%o3,%o4
bcc L(n4)
addxcc %o2,%o2,%o2
L(p4): addx %o1,%o1,%o1
addcc %g1,-1,%g1
bne L(plop)
subcc %o1,%o3,%o4
bcc L(n5)
addxcc %o2,%o2,%o2
L(p5): st %o1,[%o0]
retl
xnor %g0,%o2,%o0
L(nlop):
bcc L(p1)
addxcc %o2,%o2,%o2
L(n1): addx %o4,%o4,%o4
subcc %o4,%o3,%o1
bcc L(p2)
addxcc %o2,%o2,%o2
L(n2): addx %o4,%o4,%o4
subcc %o4,%o3,%o1
bcc L(p3)
addxcc %o2,%o2,%o2
L(n3): addx %o4,%o4,%o4
subcc %o4,%o3,%o1
bcc L(p4)
addxcc %o2,%o2,%o2
L(n4): addx %o4,%o4,%o4
addcc %g1,-1,%g1
bne L(nlop)
subcc %o4,%o3,%o1
bcc L(p5)
addxcc %o2,%o2,%o2
L(n5): st %o4,[%o0]
retl
xnor %g0,%o2,%o0
L(largedivisor):
and %o2,1,%o5 C %o5 = n0 & 1
srl %o2,1,%o2
sll %o1,31,%g2
or %g2,%o2,%o2 C %o2 = lo(n1n0 >> 1)
srl %o1,1,%o1 C %o1 = hi(n1n0 >> 1)
and %o3,1,%g2
srl %o3,1,%g3 C %g3 = floor(d / 2)
add %g3,%g2,%g3 C %g3 = ceil(d / 2)
b L(Lp1)
addxcc %o2,%o2,%o2
L(Lplop):
bcc L(Ln1)
addxcc %o2,%o2,%o2
L(Lp1): addx %o1,%o1,%o1
subcc %o1,%g3,%o4
bcc L(Ln2)
addxcc %o2,%o2,%o2
L(Lp2): addx %o1,%o1,%o1
subcc %o1,%g3,%o4
bcc L(Ln3)
addxcc %o2,%o2,%o2
L(Lp3): addx %o1,%o1,%o1
subcc %o1,%g3,%o4
bcc L(Ln4)
addxcc %o2,%o2,%o2
L(Lp4): addx %o1,%o1,%o1
addcc %g1,-1,%g1
bne L(Lplop)
subcc %o1,%g3,%o4
bcc L(Ln5)
addxcc %o2,%o2,%o2
L(Lp5): add %o1,%o1,%o1 C << 1
tst %g2
bne L(oddp)
add %o5,%o1,%o1
st %o1,[%o0]
retl
xnor %g0,%o2,%o0
L(Lnlop):
bcc L(Lp1)
addxcc %o2,%o2,%o2
L(Ln1): addx %o4,%o4,%o4
subcc %o4,%g3,%o1
bcc L(Lp2)
addxcc %o2,%o2,%o2
L(Ln2): addx %o4,%o4,%o4
subcc %o4,%g3,%o1
bcc L(Lp3)
addxcc %o2,%o2,%o2
L(Ln3): addx %o4,%o4,%o4
subcc %o4,%g3,%o1
bcc L(Lp4)
addxcc %o2,%o2,%o2
L(Ln4): addx %o4,%o4,%o4
addcc %g1,-1,%g1
bne L(Lnlop)
subcc %o4,%g3,%o1
bcc L(Lp5)
addxcc %o2,%o2,%o2
L(Ln5): add %o4,%o4,%o4 C << 1
tst %g2
bne L(oddn)
add %o5,%o4,%o4
st %o4,[%o0]
retl
xnor %g0,%o2,%o0
L(oddp):
xnor %g0,%o2,%o2
C q' in %o2. r' in %o1
addcc %o1,%o2,%o1
bcc L(Lp6)
addx %o2,0,%o2
sub %o1,%o3,%o1
L(Lp6): subcc %o1,%o3,%g0
bcs L(Lp7)
subx %o2,-1,%o2
sub %o1,%o3,%o1
L(Lp7): st %o1,[%o0]
retl
mov %o2,%o0
L(oddn):
xnor %g0,%o2,%o2
C q' in %o2. r' in %o4
addcc %o4,%o2,%o4
bcc L(Ln6)
addx %o2,0,%o2
sub %o4,%o3,%o4
L(Ln6): subcc %o4,%o3,%g0
bcs L(Ln7)
subx %o2,-1,%o2
sub %o4,%o3,%o4
L(Ln7): st %o4,[%o0]
retl
mov %o2,%o0
EPILOGUE(mpn_udiv_qrnnd)