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dnl RISC-V/64 mpn_cnd_add_n and mpn_cnd_sub_n.
dnl Copyright 2016, 2023 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(`cnd', `a0')
define(`rp', `a1')
define(`up', `a2')
define(`vp', `a3')
define(`n', `a4')
define(`mask', `t5')
ifdef(`OPERATION_cnd_add_n',`
define(`ADDSUB', `add')
define(`CMPCY', `sltu $1, $2, $3')
define(`func', `mpn_cnd_add_n')
')
ifdef(`OPERATION_cnd_sub_n',`
define(`ADDSUB', `sub')
define(`CMPCY', `sltu $1, $3, $4')
define(`func', `mpn_cnd_sub_n')
')
MULFUNC_PROLOGUE(mpn_cnd_add_n mpn_cnd_sub_n)
ASM_START()
PROLOGUE(func)
li t6, 0
sltiu mask, cnd, 1
addi mask, mask, -1
andi t0, n, 1
beq t0, x0, L(top)
addi up, up, 8
addi vp, vp, -8
addi rp, rp, -8
addi n, n, -1
j L(mid)
L(top): ld a0, 0(up)
ld a6, 0(vp)
addi n, n, -2 C bookkeeping
addi up, up, 16 C bookkeeping
and a6, a6, mask
ADDSUB t0, a0, a6
CMPCY( t2, t0, a0, a6)
ADDSUB t4, t0, t6 C cycle 3, 9, ...
CMPCY( t3, t4, t0, t6) C cycle 4, 10, ...
sd t4, 0(rp)
add t6, t2, t3 C cycle 5, 11, ...
L(mid): ld a5, -8(up)
ld a7, 8(vp)
addi vp, vp, 16 C bookkeeping
addi rp, rp, 16 C bookkeeping
and a7, a7, mask
ADDSUB t1, a5, a7
CMPCY( t2, t1, a5, a7)
ADDSUB t4, t1, t6 C cycle 0, 6, ...
CMPCY( t3, t4, t1, t6) C cycle 1, 7, ...
sd t4, -8(rp)
add t6, t2, t3 C cycle 2, 8, ...
bne n, x0, L(top) C bookkeeping
L(end): mv a0, t6
ret
EPILOGUE()
ASM_END()
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