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dnl RISC-V/64 mpn_add_n and mpn_sub_n.
dnl Copyright 2016 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', `a0')
define(`ap', `a1')
define(`bp', `a2')
define(`n', `a3')
define(`i', `a6')
ifdef(`OPERATION_add_n',`
define(`ADDSUB', `add')
define(`CMPCY', `sltu $1, $2, $3')
define(`func', `mpn_add_n')
')
ifdef(`OPERATION_sub_n',`
define(`ADDSUB', `sub')
define(`CMPCY', `sltu $1, $3, $4')
define(`func', `mpn_sub_n')
')
MULFUNC_PROLOGUE(mpn_add_n mpn_sub_n)
ASM_START()
PROLOGUE(func)
li t6, 0
srli i, n, 2
ld a4, 0(ap)
ld a5, 0(bp)
andi t0, n, 1
andi t1, n, 2
bnez t0, L(bx1)
L(bx0): bnez t1, L(b10)
L(b00): addi rp, rp, -8
addi i, i, -1
j L(b0)
L(b10): addi bp, bp, -16
addi ap, ap, -16
addi rp, rp, -24
j L(b2)
L(bx1): bnez t1, L(b11)
L(b01): beqz i, L(1)
addi bp, bp, 8
addi ap, ap, 8
addi i, i, -1
j L(b1)
L(1): ADDSUB t0, a4, a5
sd t0, 0(rp)
CMPCY( a0, t0, a4, a5)
ret
L(b11): addi bp, bp, -8
addi ap, ap, -8
addi rp, rp, -16
j L(b3)
ALIGN( 16)
L(top): addi bp, bp, 32
addi ap, ap, 32
addi rp, rp, 32
addi i, i, -1
L(b1): ADDSUB t0, a4, a5
CMPCY( t2, t0, a4, a5)
ld a4, 0(ap)
ld a5, 0(bp)
ADDSUB t4, t0, t6
CMPCY( t3, t4, t0, t6)
sd t4, 0(rp)
or t6, t2, t3
L(b0): ADDSUB t1, a4, a5
CMPCY( t2, t1, a4, a5)
ld a4, 8(ap)
ld a5, 8(bp)
ADDSUB t4, t1, t6
CMPCY( t3, t4, t1, t6)
sd t4, 8(rp)
or t6, t2, t3
L(b3): ADDSUB t0, a4, a5
CMPCY( t2, t0, a4, a5)
ld a4, 16(ap)
ld a5, 16(bp)
ADDSUB t4, t0, t6
CMPCY( t3, t4, t0, t6)
sd t4, 16(rp)
or t6, t2, t3
L(b2): ADDSUB t1, a4, a5
CMPCY( t2, t1, a4, a5)
ld a4, 24(ap)
ld a5, 24(bp)
ADDSUB t4, t1, t6
CMPCY( t3, t4, t1, t6)
sd t4, 24(rp)
or t6, t2, t3
bne i, x0, L(top)
L(end): ADDSUB t0, a4, a5
CMPCY( t2, t0, a4, a5)
ADDSUB t4, t0, t6
CMPCY( t3, t4, t0, t6)
sd t4, 32(rp)
or a0, t2, t3
ret
EPILOGUE()
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