| /* Copyright (C) 2014-2021 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" |
| |
| .section .text.__pruabi_mpyll, "ax" |
| |
| .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) |