8d9254fc8a
From-SVN: r279813
58 lines
1.6 KiB
ArmAsm
58 lines
1.6 KiB
ArmAsm
/* Copyright (C) 2014-2020 Free Software Foundation, Inc.
|
|
Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
|
|
|
|
This file is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the
|
|
Free Software Foundation; either version 3, or (at your option) any
|
|
later version.
|
|
|
|
This file 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
|
|
General Public License for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>.
|
|
|
|
(al + C * ah) * (bl + C * bh) = al * bl
|
|
+ C * ah * bl
|
|
+ C * al * bh
|
|
+ C * C * ah * bh -> discard, overflow
|
|
Where C=(1 << 32)
|
|
*/
|
|
|
|
#include "pru-asm.h"
|
|
|
|
.global SYM(__pruabi_mpyll)
|
|
FUNC(__pruabi_mpyll)
|
|
SYM(__pruabi_mpyll):
|
|
/* + C * ah * bl */
|
|
mov r28, r15
|
|
mov r29, r16
|
|
nop
|
|
xin 0, r26, 8
|
|
|
|
/* + C * al * bh */
|
|
mov r28, r14
|
|
mov r29, r17
|
|
mov r15, r26 /* "Loose" ah, record only reslo. */
|
|
xin 0, r26, 8
|
|
|
|
/* + al * bl */
|
|
/* mov r28, r14 -> No need, already loaded. */
|
|
mov r29, r16
|
|
add r15, r15, r26
|
|
xin 0, r26, 8
|
|
mov r14, r26
|
|
add r15, r15, r27
|
|
|
|
ret
|
|
|
|
ENDFUNC(__pruabi_mpyll)
|