uclibc-ng/libm/or1k/fenv_private.h

/* Private floating point rounding and exceptions handling.  OpenRISC version.
   Copyright (C) 2024-2025 Free Software Foundation, Inc.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef OR1K_FENV_PRIVATE_H
#define OR1K_FENV_PRIVATE_H 1

#include <fenv.h>
#include <fpu_control.h>

static __always_inline void
libc_feholdexcept_or1k (fenv_t *envp)
{
  fpu_control_t cw;
  fpu_control_t cw_new;

  /* Get and store the environment.  */
  _FPU_GETCW (cw);
  *envp = cw;

  /* Clear the exception status flags.  */
  cw_new = cw & ~FE_ALL_EXCEPT;

  if (cw != cw_new)
    _FPU_SETCW (cw_new);
}

#define libc_feholdexcept  libc_feholdexcept_or1k
#define libc_feholdexceptf libc_feholdexcept_or1k
#define libc_feholdexceptl libc_feholdexcept_or1k

static __always_inline void
libc_fesetround_or1k (int round)
{
  fpu_control_t cw;
  fpu_control_t cw_new;

  _FPU_GETCW (cw);
  cw_new = cw & ~_FPU_FPCSR_RM_MASK;
  cw_new |= round;
  if (cw != cw_new)
    _FPU_SETCW (cw_new);
}

#define libc_fesetround  libc_fesetround_or1k
#define libc_fesetroundf libc_fesetround_or1k
#define libc_fesetroundl libc_fesetround_or1k

static __always_inline void
libc_feholdexcept_setround_or1k (fenv_t *envp, int round)
{
  fpu_control_t cw;
  fpu_control_t cw_new;

  /* Get and store the environment.  */
  _FPU_GETCW (cw);
  *envp = cw;

  /* Clear the status flags and rounding mode.  */
  cw_new = cw & ~(FE_ALL_EXCEPT | _FPU_FPCSR_RM_MASK);

  /* Set rounding mode.  */
  cw_new |= round;

  if (cw != cw_new)
    _FPU_SETCW (cw_new);
}

#define libc_feholdexcept_setround  libc_feholdexcept_setround_or1k
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_or1k
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_or1k

static __always_inline int
libc_fetestexcept_or1k (int ex)
{
  fpu_control_t cw;

  /* Get current control word.  */
  _FPU_GETCW (cw);

  /* Check if any of the queried exception flags are set.  */
  return cw & ex & FE_ALL_EXCEPT;
}

#define libc_fetestexcept  libc_fetestexcept_or1k
#define libc_fetestexceptf libc_fetestexcept_or1k
#define libc_fetestexceptl libc_fetestexcept_or1k

static __always_inline void
libc_fesetenv_or1k (const fenv_t *envp)
{
  if (envp == FE_DFL_ENV)
    _FPU_SETCW (_FPU_DEFAULT);
  else
    _FPU_SETCW (*envp);
}

#define libc_fesetenv  libc_fesetenv_or1k
#define libc_fesetenvf libc_fesetenv_or1k
#define libc_fesetenvl libc_fesetenv_or1k
#define libc_feresetround_noex  libc_fesetenv_or1k
#define libc_feresetround_noexf libc_fesetenv_or1k
#define libc_feresetround_noexl libc_fesetenv_or1k

static __always_inline int
libc_feupdateenv_test_or1k (const fenv_t *envp, int ex)
{
  fpu_control_t cw;
  fpu_control_t cw_new;
  int excepts;

  /* Get current control word.  */
  _FPU_GETCW (cw);

  /* Merge current exception flags with the passed fenv.  */
  excepts = cw & FE_ALL_EXCEPT;
  cw_new = (envp == FE_DFL_ENV ? _FPU_DEFAULT : *envp) | excepts;

  if (unlikely (cw != cw_new))
    _FPU_SETCW (cw_new);

  /* Raise the exceptions if enabled in the new FP state.  */
  if (unlikely (excepts))
    feraiseexcept (excepts);

  return excepts & ex;
}

#define libc_feupdateenv_test  libc_feupdateenv_test_or1k
#define libc_feupdateenv_testf libc_feupdateenv_test_or1k
#define libc_feupdateenv_testl libc_feupdateenv_test_or1k

static __always_inline void
libc_feupdateenv_or1k (const fenv_t *envp)
{
  libc_feupdateenv_test_or1k (envp, 0);
}

#define libc_feupdateenv  libc_feupdateenv_or1k
#define libc_feupdateenvf libc_feupdateenv_or1k
#define libc_feupdateenvl libc_feupdateenv_or1k

static __always_inline void
libc_feholdsetround_or1k (fenv_t *envp, int round)
{
  fpu_control_t cw;

  _FPU_GETCW (cw);
  *envp = cw;

  /* Check whether rounding modes are different.  */
  round = (cw ^ round) & _FPU_FPCSR_RM_MASK;

  /* Set new rounding mode if different.  */
  if (unlikely (round != 0))
    _FPU_SETCW (cw ^ round);
}

#define libc_feholdsetround  libc_feholdsetround_or1k
#define libc_feholdsetroundf libc_feholdsetround_or1k
#define libc_feholdsetroundl libc_feholdsetround_or1k

static __always_inline void
libc_feresetround_or1k (fenv_t *envp)
{
  fpu_control_t cw;
  int round;

  _FPU_GETCW (cw);

  /* Check whether rounding modes are different.  */
  round = (*envp ^ cw) & _FPU_FPCSR_RM_MASK;

  /* Restore the rounding mode if it was changed.  */
  if (unlikely (round != 0))
    _FPU_SETCW (cw ^ round);
}

#define libc_feresetround  libc_feresetround_or1k
#define libc_feresetroundf libc_feresetround_or1k
#define libc_feresetroundl libc_feresetround_or1k

#endif