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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 1995, 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 3 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. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C INPUT PARAMETERS
define(res_ptr,%o0)
define(s1_ptr,%o1)
define(s2_ptr,%o2)
define(n,%o3)
ASM_START()
PROLOGUE(mpn_add_n)
xor s2_ptr,res_ptr,%g1
andcc %g1,4,%g0
bne L(1) C branch if alignment differs
nop
C ** V1a **
L(0): andcc res_ptr,4,%g0 C res_ptr unaligned? Side effect: cy=0
be L(v1) C if no, branch
nop
C Add least significant limb separately to align res_ptr and s2_ptr
ld [s1_ptr],%g4
add s1_ptr,4,s1_ptr
ld [s2_ptr],%g2
add s2_ptr,4,s2_ptr
add n,-1,n
addcc %g4,%g2,%o4
st %o4,[res_ptr]
add res_ptr,4,res_ptr
L(v1): addx %g0,%g0,%o4 C save cy in register
cmp n,2 C if n < 2 ...
bl L(end2) C ... branch to tail code
subcc %g0,%o4,%g0 C restore cy
ld [s1_ptr+0],%g4
addcc n,-10,n
ld [s1_ptr+4],%g1
ldd [s2_ptr+0],%g2
blt L(fin1)
subcc %g0,%o4,%g0 C restore cy
C Add blocks of 8 limbs until less than 8 limbs remain
L(loop1):
addxcc %g4,%g2,%o4
ld [s1_ptr+8],%g4
addxcc %g1,%g3,%o5
ld [s1_ptr+12],%g1
ldd [s2_ptr+8],%g2
std %o4,[res_ptr+0]
addxcc %g4,%g2,%o4
ld [s1_ptr+16],%g4
addxcc %g1,%g3,%o5
ld [s1_ptr+20],%g1
ldd [s2_ptr+16],%g2
std %o4,[res_ptr+8]
addxcc %g4,%g2,%o4
ld [s1_ptr+24],%g4
addxcc %g1,%g3,%o5
ld [s1_ptr+28],%g1
ldd [s2_ptr+24],%g2
std %o4,[res_ptr+16]
addxcc %g4,%g2,%o4
ld [s1_ptr+32],%g4
addxcc %g1,%g3,%o5
ld [s1_ptr+36],%g1
ldd [s2_ptr+32],%g2
std %o4,[res_ptr+24]
addx %g0,%g0,%o4 C save cy in register
addcc n,-8,n
add s1_ptr,32,s1_ptr
add s2_ptr,32,s2_ptr
add res_ptr,32,res_ptr
bge L(loop1)
subcc %g0,%o4,%g0 C restore cy
L(fin1):
addcc n,8-2,n
blt L(end1)
subcc %g0,%o4,%g0 C restore cy
C Add blocks of 2 limbs until less than 2 limbs remain
L(loope1):
addxcc %g4,%g2,%o4
ld [s1_ptr+8],%g4
addxcc %g1,%g3,%o5
ld [s1_ptr+12],%g1
ldd [s2_ptr+8],%g2
std %o4,[res_ptr+0]
addx %g0,%g0,%o4 C save cy in register
addcc n,-2,n
add s1_ptr,8,s1_ptr
add s2_ptr,8,s2_ptr
add res_ptr,8,res_ptr
bge L(loope1)
subcc %g0,%o4,%g0 C restore cy
L(end1):
addxcc %g4,%g2,%o4
addxcc %g1,%g3,%o5
std %o4,[res_ptr+0]
addx %g0,%g0,%o4 C save cy in register
andcc n,1,%g0
be L(ret1)
subcc %g0,%o4,%g0 C restore cy
C Add last limb
ld [s1_ptr+8],%g4
ld [s2_ptr+8],%g2
addxcc %g4,%g2,%o4
st %o4,[res_ptr+8]
L(ret1):
retl
addx %g0,%g0,%o0 C return carry-out from most sign. limb
L(1): xor s1_ptr,res_ptr,%g1
andcc %g1,4,%g0
bne L(2)
nop
C ** V1b **
mov s2_ptr,%g1
mov s1_ptr,s2_ptr
b L(0)
mov %g1,s1_ptr
C ** V2 **
C If we come here, the alignment of s1_ptr and res_ptr as well as the
C alignment of s2_ptr and res_ptr differ. Since there are only two ways
C things can be aligned (that we care about) we now know that the alignment
C of s1_ptr and s2_ptr are the same.
L(2): cmp n,1
be L(jone)
nop
andcc s1_ptr,4,%g0 C s1_ptr unaligned? Side effect: cy=0
be L(v2) C if no, branch
nop
C Add least significant limb separately to align s1_ptr and s2_ptr
ld [s1_ptr],%g4
add s1_ptr,4,s1_ptr
ld [s2_ptr],%g2
add s2_ptr,4,s2_ptr
add n,-1,n
addcc %g4,%g2,%o4
st %o4,[res_ptr]
add res_ptr,4,res_ptr
L(v2): addx %g0,%g0,%o4 C save cy in register
addcc n,-8,n
blt L(fin2)
subcc %g0,%o4,%g0 C restore cy
C Add blocks of 8 limbs until less than 8 limbs remain
L(loop2):
ldd [s1_ptr+0],%g2
ldd [s2_ptr+0],%o4
addxcc %g2,%o4,%g2
st %g2,[res_ptr+0]
addxcc %g3,%o5,%g3
st %g3,[res_ptr+4]
ldd [s1_ptr+8],%g2
ldd [s2_ptr+8],%o4
addxcc %g2,%o4,%g2
st %g2,[res_ptr+8]
addxcc %g3,%o5,%g3
st %g3,[res_ptr+12]
ldd [s1_ptr+16],%g2
ldd [s2_ptr+16],%o4
addxcc %g2,%o4,%g2
st %g2,[res_ptr+16]
addxcc %g3,%o5,%g3
st %g3,[res_ptr+20]
ldd [s1_ptr+24],%g2
ldd [s2_ptr+24],%o4
addxcc %g2,%o4,%g2
st %g2,[res_ptr+24]
addxcc %g3,%o5,%g3
st %g3,[res_ptr+28]
addx %g0,%g0,%o4 C save cy in register
addcc n,-8,n
add s1_ptr,32,s1_ptr
add s2_ptr,32,s2_ptr
add res_ptr,32,res_ptr
bge L(loop2)
subcc %g0,%o4,%g0 C restore cy
L(fin2):
addcc n,8-2,n
blt L(end2)
subcc %g0,%o4,%g0 C restore cy
L(loope2):
ldd [s1_ptr+0],%g2
ldd [s2_ptr+0],%o4
addxcc %g2,%o4,%g2
st %g2,[res_ptr+0]
addxcc %g3,%o5,%g3
st %g3,[res_ptr+4]
addx %g0,%g0,%o4 C save cy in register
addcc n,-2,n
add s1_ptr,8,s1_ptr
add s2_ptr,8,s2_ptr
add res_ptr,8,res_ptr
bge L(loope2)
subcc %g0,%o4,%g0 C restore cy
L(end2):
andcc n,1,%g0
be L(ret2)
subcc %g0,%o4,%g0 C restore cy
C Add last limb
L(jone):
ld [s1_ptr],%g4
ld [s2_ptr],%g2
addxcc %g4,%g2,%o4
st %o4,[res_ptr]
L(ret2):
retl
addx %g0,%g0,%o0 C return carry-out from most sign. limb
EPILOGUE(mpn_add_n)
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