dnl RISC-V/64 mpn_addmul_1
and mpn_submul_1.
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(`up
', `a1')
define(`n
', `a2')
define(`v0
', `a3')
ifdef(`OPERATION_addmul_1
',`
define(`ADDSUB
', `add')
define(`CMPCY
', `sltu $1, $2, $3')
define(`func
', `mpn_addmul_1')
')
ifdef(`OPERATION_submul_1
',`
define(`ADDSUB
', `sub')
define(`CMPCY
', `sltu $1, $3, $2')
define(`func
', `mpn_submul_1')
')
MULFUNC_PROLOGUE(mpn_addmul_1 mpn_submul_1)
ASM_START()
PROLOGUE(func)
li a6, 0
L(top): ld a7, 0(up)
addi up, up, 8 C bookkeeping
ld a4, 0(rp)
addi rp, rp, 8 C bookkeeping
mul a5, a7, v0
addi n, n, -1 C bookkeeping
mulhu a7, a7, v0
ADDSUB a5, a4, a5
ADDSUB a6, a5, a6 C cycle 0, 3, ...
CMPCY( a4, a5, a4)
add a4, a4, a7
CMPCY( a5, a6, a5) C cycle 1, 4, ...
sd a6, -8(rp)
add a6, a4, a5 C cycle 2, 5, ...
bne n, x0, L(top) C bookkeeping
L(
end): mv a0, a6
ret
EPILOGUE()
ASM_END()
