Retro68/gcc/libgcc/config/riscv/muldi3.S
Wolfgang Thaller 6fbf4226da gcc-9.1
2019-06-20 20:10:10 +02:00

49 lines
1.3 KiB
ArmAsm

/* Integer multiplication routines for RISC-V.
Copyright (C) 2016-2019 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)