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dnl SPARC mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
dnl store difference in a third limb vector.
dnl Copyright 2001 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
define(rp,%o0)
define(s1p,%o1)
define(s2p,%o2)
define(n,%o3)
define(cy,%g1)
C This code uses 64-bit operations on `o' and `g' registers. It doesn't
C require that `o' registers' upper 32 bits are preserved by the operating
C system, but if they are not, they must be zeroed. That is indeed what
C happens at least on Slowaris 2.5 and 2.6.
C On UltraSPARC 1 and 2, this code runs at 3 cycles/limb from the Dcache and at
C about 10 cycles/limb from the Ecache.
ASM_START()
PROLOGUE(mpn_sub_n)
lduw [s1p+0],%o4
lduw [s2p+0],%o5
addcc n,-2,n
bl,pn %icc,L(end1)
lduw [s1p+4],%g2
lduw [s2p+4],%g3
be,pn %icc,L(end2)
mov 0,cy
.align 16
L(loop):
sub %o4,%o5,%g4
add rp,8,rp
lduw [s1p+8],%o4
fitod %f0,%f2
C ---
sub %g4,cy,%g4
addcc n,-1,n
lduw [s2p+8],%o5
fitod %f0,%f2
C ---
srlx %g4,63,cy
add s2p,8,s2p
stw %g4,[rp-8]
be,pn %icc,L(exito)+4
C ---
sub %g2,%g3,%g4
addcc n,-1,n
lduw [s1p+12],%g2
fitod %f0,%f2
C ---
sub %g4,cy,%g4
add s1p,8,s1p
lduw [s2p+4],%g3
fitod %f0,%f2
C ---
srlx %g4,63,cy
bne,pt %icc,L(loop)
stw %g4,[rp-4]
C ---
L(exite):
sub %o4,%o5,%g4
sub %g4,cy,%g4
srlx %g4,63,cy
stw %g4,[rp+0]
sub %g2,%g3,%g4
sub %g4,cy,%g4
stw %g4,[rp+4]
retl
srlx %g4,63,%o0
L(exito):
sub %g2,%g3,%g4
sub %g4,cy,%g4
srlx %g4,63,cy
stw %g4,[rp-4]
sub %o4,%o5,%g4
sub %g4,cy,%g4
stw %g4,[rp+0]
retl
srlx %g4,63,%o0
L(end1):
sub %o4,%o5,%g4
stw %g4,[rp+0]
retl
srlx %g4,63,%o0
L(end2):
sub %o4,%o5,%g4
srlx %g4,63,cy
stw %g4,[rp+0]
sub %g2,%g3,%g4
sub %g4,cy,%g4
stw %g4,[rp+4]
retl
srlx %g4,63,%o0
EPILOGUE(mpn_sub_n)
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