xref: /netbsd-src/external/gpl3/gcc.old/dist/libgcc/config/m32c/lib2funcs.c (revision 8feb0f0b7eaff0608f8350bbfa3098827b4bb91b)

/* libgcc routines for R8C/M16C/M32C
   Copyright (C) 2005-2020 Free Software Foundation, Inc.
   Contributed by Red Hat.

   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/>.  */

typedef          int  sint32_type   __attribute__ ((mode (SI)));
typedef unsigned int  uint32_type   __attribute__ ((mode (SI)));
typedef int           word_type     __attribute__ ((mode (__word__)));

uint32_type udivmodsi4 (uint32_type, uint32_type, word_type);
sint32_type __divsi3   (sint32_type, sint32_type);
sint32_type __modsi3   (sint32_type, sint32_type);

uint32_type
udivmodsi4 (uint32_type num, uint32_type den, word_type modwanted)
{
  uint32_type bit = 1;
  uint32_type res = 0;

  while (den < num && bit && !(den & (1L << 31)))
    {
      den <<= 1;
      bit <<= 1;
    }
  while (bit)
    {
      if (num >= den)
	{
	  num -= den;
	  res |= bit;
	}
      bit >>= 1;
      den >>= 1;
    }
  if (modwanted)
    return num;
  return res;
}

sint32_type
__divsi3 (sint32_type a, sint32_type b)
{
  word_type neg = 0;
  sint32_type res;

  if (a < 0)
    {
      a = -a;
      neg = !neg;
    }

  if (b < 0)
    {
      b = -b;
      neg = !neg;
    }

  res = udivmodsi4 (a, b, 0);

  if (neg)
    res = -res;

  return res;
}

sint32_type
__modsi3 (sint32_type a, sint32_type b)
{
  word_type neg = 0;
  sint32_type res;

  if (a < 0)
    {
      a = -a;
      neg = 1;
    }

  if (b < 0)
    b = -b;

  res = udivmodsi4 (a, b, 1);

  if (neg)
    res = -res;

  return res;
}

/* See the comment by the definition of LIBGCC2_UNITS_PER_WORD in
   m32c.h for why we are creating extra versions of some of the
   functions defined in libgcc2.c.  */

#define LIBGCC2_UNITS_PER_WORD 2

#define L_clzsi2
#define L_ctzsi2
#define L_ffssi2
#define L_paritysi2
#define L_popcountsi2

#include "libgcc2.c"

uint32_type
__udivsi3 (uint32_type a, uint32_type b)
{
  return udivmodsi4 (a, b, 0);
}

uint32_type
__umoddi3 (uint32_type a, uint32_type b)
{
  return udivmodsi4 (a, b, 1);
}

/* Returns the number of leading redundant sign bits in X.
   I.e. the number of bits following the most significant bit which are
   identical to it.  There are no special cases for 0 or other values.  */

int
__clrsbhi2 (word_type x)
{
  if (x < 0)
    x = ~x;
  if (x == 0)
    return 15;
  return __builtin_clz (x) - 1;
}