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dnl SPARC mpn_submul_1 -- Multiply a limb vector with a limb and subtract
dnl the result from a second limb vector.
dnl Copyright 1992-1994, 2000 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 res_ptr o0
C s1_ptr o1
C size o2
C s2_limb o3
ASM_START()
PROLOGUE(mpn_submul_1)
C Make S1_PTR and RES_PTR point at the end of their blocks
C and put (- 4 x SIZE) in index/loop counter.
sll %o2,2,%o2
add %o0,%o2,%o4 C RES_PTR in o4 since o0 is retval
add %o1,%o2,%o1
sub %g0,%o2,%o2
cmp %o3,0xfff
bgu L(large)
nop
ld [%o1+%o2],%o5
mov 0,%o0
b L(0)
add %o4,-4,%o4
L(loop0):
subcc %o5,%g1,%g1
ld [%o1+%o2],%o5
addx %o0,%g0,%o0
st %g1,[%o4+%o2]
L(0): wr %g0,%o3,%y
sra %o5,31,%g2
and %o3,%g2,%g2
andcc %g1,0,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,0,%g1
sra %g1,20,%g4
sll %g1,12,%g1
rd %y,%g3
srl %g3,20,%g3
or %g1,%g3,%g1
addcc %g1,%o0,%g1
addx %g2,%g4,%o0 C add sign-compensation and cy to hi limb
addcc %o2,4,%o2 C loop counter
bne L(loop0)
ld [%o4+%o2],%o5
subcc %o5,%g1,%g1
addx %o0,%g0,%o0
retl
st %g1,[%o4+%o2]
L(large):
ld [%o1+%o2],%o5
mov 0,%o0
sra %o3,31,%g4 C g4 = mask of ones iff S2_LIMB < 0
b L(1)
add %o4,-4,%o4
L(loop):
subcc %o5,%g3,%g3
ld [%o1+%o2],%o5
addx %o0,%g0,%o0
st %g3,[%o4+%o2]
L(1): wr %g0,%o5,%y
and %o5,%g4,%g2
andcc %g0,%g0,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%g0,%g1
rd %y,%g3
addcc %g3,%o0,%g3
addx %g2,%g1,%o0
addcc %o2,4,%o2
bne L(loop)
ld [%o4+%o2],%o5
subcc %o5,%g3,%g3
addx %o0,%g0,%o0
retl
st %g3,[%o4+%o2]
EPILOGUE(mpn_submul_1)
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