/* Copyright (C) 2007-2022 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 "bid_internal.h"
#include "bid_gcc_intrinsics.h"

#if DECIMAL_GLOBAL_ROUNDING
BID_THREAD _IDEC_round _IDEC_glbround = ROUNDING_TO_NEAREST;

#if DECIMAL_GLOBAL_ROUNDING_ACCESS_FUNCTIONS
void
__dfp_set_round (int mode) {
  _IDEC_glbround = mode;
}

int
__dfp_get_round (void) {
  return _IDEC_glbround;
}
#endif
#endif

#if DECIMAL_GLOBAL_EXCEPTION_FLAGS
BID_THREAD _IDEC_flags _IDEC_glbflags = EXACT_STATUS;

#if DECIMAL_GLOBAL_EXCEPTION_FLAGS_ACCESS_FUNCTIONS
#include <fenv.h>
/* fesetexcept is C23/glibc-2.33+; macOS/mingw clang's <fenv.h> lacks it.
 * rcc's vendored-build patch: fall back to feraiseexcept (the decimal
 * result never depends on the host FPU exception flags). */
#ifndef __GLIBC__
#if !defined(fesetexcept)
int fesetexcept(int __excepts) { return feraiseexcept(__excepts); }
#endif
#endif

void
__dfp_clear_except (void) {
  _IDEC_glbflags &= ~FLAG_MASK;
}

int
__dfp_test_except (int mask) {
  int flags = 0;

  if ((_IDEC_glbflags & INEXACT_EXCEPTION) != 0)
    flags |= mask & FE_INEXACT;
  if ((_IDEC_glbflags & UNDERFLOW_EXCEPTION) != 0)
    flags |= mask & FE_UNDERFLOW;
  if ((_IDEC_glbflags & OVERFLOW_EXCEPTION) != 0)
    flags |= mask & FE_OVERFLOW;
  if ((_IDEC_glbflags & ZERO_DIVIDE_EXCEPTION) != 0)
    flags |= mask & FE_DIVBYZERO;
  if ((_IDEC_glbflags & INVALID_EXCEPTION) != 0)
    flags |= mask & FE_INVALID;

  return flags;
}

void
__dfp_raise_except (int mask) {
  _IDEC_flags flags = 0;

  if ((mask & FE_INEXACT) != 0)
    flags |= INEXACT_EXCEPTION;
  if ((mask & FE_UNDERFLOW) != 0)
    flags |= UNDERFLOW_EXCEPTION;
  if ((mask & FE_OVERFLOW) != 0)
    flags |= OVERFLOW_EXCEPTION;
  if ((mask & FE_DIVBYZERO) != 0)
    flags |= ZERO_DIVIDE_EXCEPTION;
  if ((mask & FE_INVALID) != 0)
    flags |= INVALID_EXCEPTION;

  _IDEC_glbflags |= flags;
}

void
__dfp_set_status (int excepts) {
  _IDEC_glbflags |= excepts;
  if (excepts == INEXACT_EXCEPTION)
    {
      fesetexcept (FE_INEXACT);
    }
  else
    {
      int fexcepts = (excepts & INEXACT_EXCEPTION) ? FE_INEXACT : 0;
      fexcepts = (excepts & OVERFLOW_EXCEPTION) ? FE_OVERFLOW : 0;
      fexcepts = (excepts & UNDERFLOW_EXCEPTION) ? FE_UNDERFLOW : 0;
      fexcepts = (excepts & ZERO_DIVIDE_EXCEPTION) ? FE_DIVBYZERO : 0;
      fexcepts = (excepts & INVALID_EXCEPTION) ? FE_INVALID: 0;
      fesetexcept (fexcepts);
    }
}
#endif
#endif

#if DECIMAL_ALTERNATE_EXCEPTION_HANDLING
#if DECIMAL_GLOBAL_EXCEPTION_MASKS
BID_THREAD _IDEC_exceptionmasks _IDEC_glbexceptionmasks =
  _IDEC_allexcmasksset;
#endif
#if DECIMAL_GLOBAL_EXCEPTION_INFO
BID_THREAD _IDEC_excepthandling _IDEC_glbexcepthandling;
#endif
#endif
