/* Shift functions for the GCC support library for the MSP430
   Copyright (C) 2011 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  sint16_type   __attribute__ ((mode (HI)));
typedef unsigned int  uint16_type   __attribute__ ((mode (HI)));

uint32_type __ashlsi3 (uint32_type in, char bit);
sint32_type __ashrsi3 (sint32_type in, char bit);
int __clrsbhi2 (sint16_type x);
extern int __clrsbsi2 (sint32_type x);

typedef struct
{
  union
  {
    uint32_type u;
    uint16_type h[2];
  } u;
} dd;

uint32_type
__ashlsi3 (uint32_type in, char bit)
{
  uint16_type h, l;
  dd d;

  if (bit > 32)
    return 0;
  if (bit < 0)
    return in;

  d.u.u = in;
  h = d.u.h[1];
  l = d.u.h[0];

  if (bit > 15)
    {
      h = l;
      l = 0;
      bit -= 16;
    }

  while (bit)
    {
      h = (h << 1) | (l >> 15);
      l <<= 1;
      bit --;
    }

  d.u.h[1] = h;
  d.u.h[0] = l;
  return d.u.u;
}

sint32_type
__ashrsi3 (sint32_type in, char bit)
{
  sint16_type h;
  uint16_type l;
  dd d;

  if (bit > 32)
    return 0;
  if (bit < 0)
    return in;

  d.u.u = in;
  h = d.u.h[1];
  l = d.u.h[0];

  while (bit)
    {
      l = (h << 15) | (l >> 1);
      h >>= 1;
      bit --;
    }

  d.u.h[1] = h;
  d.u.h[0] = l;
  return d.u.u;
}

int
__clrsbhi2 (sint16_type x)
{
  if (x == 0)
    return 15;
  return __clrsbsi2 ((sint32_type) x) - 16;
}