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/* ARM64 sub_n -- Subtract two limb vectors of the same length > 0 and store
* sum in a third limb vector.
*
* Copyright (C) 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "sysdep.h"
#include "asm-syntax.h"
#include "asm-common-aarch64.h"
/*******************
* mpi_limb_t
* _gcry_mpih_sub_n( mpi_ptr_t res_ptr, x0
* mpi_ptr_t s1_ptr, x1
* mpi_ptr_t s2_ptr, x2
* mpi_size_t size) w3
*/
.text
.globl C_SYMBOL_NAME(_gcry_mpih_sub_n)
ELF(.type C_SYMBOL_NAME(_gcry_mpih_sub_n),%function)
C_SYMBOL_NAME(_gcry_mpih_sub_n):
CFI_STARTPROC()
and w5, w3, #3;
subs xzr, xzr, xzr; /* prepare carry flag for sub */
cbz w5, .Large_loop;
.Loop:
ldr x4, [x1], #8;
sub w3, w3, #1;
ldr x11, [x2], #8;
and w5, w3, #3;
sbcs x4, x4, x11;
str x4, [x0], #8;
cbz w3, .Lend;
cbnz w5, .Loop;
.Large_loop:
ldp x4, x6, [x1], #16;
ldp x5, x7, [x2], #16;
ldp x8, x10, [x1], #16;
ldp x9, x11, [x2], #16;
sub w3, w3, #4;
sbcs x4, x4, x5;
sbcs x6, x6, x7;
sbcs x8, x8, x9;
sbcs x10, x10, x11;
stp x4, x6, [x0], #16;
stp x8, x10, [x0], #16;
cbnz w3, .Large_loop;
.Lend:
cset x0, cc;
ret;
CFI_ENDPROC()
ELF(.size C_SYMBOL_NAME(_gcry_mpih_sub_n),.-C_SYMBOL_NAME(_gcry_mpih_sub_n);)
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