linux-phytium/arch/riscv/lib/udivdi3.S

/*
 * Copyright (C) 2016-2017 Free Software Foundation, Inc.
 *
 *   This program 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, version 2.
 *
 *   This program 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.
 */

  .globl __udivdi3
__udivdi3:
  mv    a2, a1
  mv    a1, a0
  li    a0, -1
  beqz  a2, .L5
  li    a3, 1
  bgeu  a2, a1, .L2
.L1:
  blez  a2, .L2
  slli  a2, a2, 1
  slli  a3, a3, 1
  bgtu  a1, a2, .L1
.L2:
  li    a0, 0
.L3:
  bltu  a1, a2, .L4
  sub   a1, a1, a2
  or    a0, a0, a3
.L4:
  srli  a3, a3, 1
  srli  a2, a2, 1
  bnez  a3, .L3
.L5:
  ret