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dnl SPARC mpn_add_n -- Add two limb vectors of the same length > 0 and store
dnl sum in a third limb vector.
dnl Copyright 2001 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 to
dnl the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
dnl MA 02110-1301, USA.
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_add_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):
add %o4,%o5,%g4
add rp,8,rp
lduw [s1p+8],%o4
fitod %f0,%f2
C ---
add cy,%g4,%g4
addcc n,-1,n
lduw [s2p+8],%o5
fitod %f0,%f2
C ---
srlx %g4,32,cy
add s2p,8,s2p
stw %g4,[rp-8]
be,pn %icc,L(exito)+4
C ---
add %g2,%g3,%g4
addcc n,-1,n
lduw [s1p+12],%g2
fitod %f0,%f2
C ---
add cy,%g4,%g4
add s1p,8,s1p
lduw [s2p+4],%g3
fitod %f0,%f2
C ---
srlx %g4,32,cy
bne,pt %icc,L(loop)
stw %g4,[rp-4]
C ---
L(exite):
add %o4,%o5,%g4
add cy,%g4,%g4
srlx %g4,32,cy
stw %g4,[rp+0]
add %g2,%g3,%g4
add cy,%g4,%g4
stw %g4,[rp+4]
retl
srlx %g4,32,%o0
L(exito):
add %g2,%g3,%g4
add cy,%g4,%g4
srlx %g4,32,cy
stw %g4,[rp-4]
add %o4,%o5,%g4
add cy,%g4,%g4
stw %g4,[rp+0]
retl
srlx %g4,32,%o0
L(end1):
add %o4,%o5,%g4
stw %g4,[rp+0]
retl
srlx %g4,32,%o0
L(end2):
add %o4,%o5,%g4
srlx %g4,32,cy
stw %g4,[rp+0]
add %g2,%g3,%g4
add cy,%g4,%g4
stw %g4,[rp+4]
retl
srlx %g4,32,%o0
EPILOGUE(mpn_add_n)
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