| /* Integer multiplication routines for RISC-V. |
| |
| Copyright (C) 2016-2023 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC 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. |
| |
| GCC 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/>. */ |
| |
| #include "riscv-asm.h" |
| |
| .text |
| .align 2 |
| |
| #if __riscv_xlen == 32 |
| /* Our RV64 64-bit routine is equivalent to our RV32 32-bit routine. */ |
| # define __muldi3 __mulsi3 |
| #endif |
| |
| FUNC_BEGIN (__muldi3) |
| mv a2, a0 |
| li a0, 0 |
| .L1: |
| andi a3, a1, 1 |
| beqz a3, .L2 |
| add a0, a0, a2 |
| .L2: |
| srli a1, a1, 1 |
| slli a2, a2, 1 |
| bnez a1, .L1 |
| ret |
| FUNC_END (__muldi3) |
