Subversion Repositories hf-risc

/* Private floating point rounding and exceptions handling.  RISC-V version.
   Copyright (C) 2014-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
 
   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
   <http://www.gnu.org/licenses/>.  */
 
#ifndef RISCV_MATH_PRIVATE_H
#define RISCV_MATH_PRIVATE_H 1
 
#include <fenv.h>
#include <fpu_control.h>
 
static __always_inline void
libc_feholdexcept_riscv (fenv_t *envp)
{
  _FPU_GETCW (*envp);
  _FPU_SETFLAGS (0);
}
 
#define libc_feholdexcept  libc_feholdexcept_riscv
#define libc_feholdexceptf libc_feholdexcept_riscv
#define libc_feholdexceptl libc_feholdexcept_riscv
 
static __always_inline void
libc_fesetround_riscv (int round)
{
  _FPU_SETROUND (round);
}
 
#define libc_fesetround  libc_fesetround_riscv
#define libc_fesetroundf libc_fesetround_riscv
#define libc_fesetroundl libc_fesetround_riscv
 
static __always_inline void
libc_feholdexcept_setround_riscv (fenv_t *envp, int round)
{
  libc_fesetround_riscv (round);
  libc_feholdexcept_riscv (envp);
}
 
#define libc_feholdexcept_setround  libc_feholdexcept_setround_riscv
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_riscv
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_riscv
 
static __always_inline int
libc_fetestexcept_riscv (int ex)
{
  int cw;
 
  _FPU_GETFLAGS (cw);
 
  return cw & ex;
}
 
#define libc_fetestexcept  libc_fetestexcept_riscv
#define libc_fetestexceptf libc_fetestexcept_riscv
#define libc_fetestexceptl libc_fetestexcept_riscv
 
static __always_inline void
libc_fesetenv_riscv (const fenv_t *envp)
{
  long env = (long) envp - (long) FE_DFL_ENV;
  if (env != 0)
    env = *envp;
 
  _FPU_SETCW (env);
}
 
#define libc_fesetenv  libc_fesetenv_riscv
#define libc_fesetenvf libc_fesetenv_riscv
#define libc_fesetenvl libc_fesetenv_riscv
#define libc_feresetround_noex  libc_fesetenv_riscv
#define libc_feresetround_noexf libc_fesetenv_riscv
#define libc_feresetround_noexl libc_fesetenv_riscv
 
static __always_inline int
libc_feupdateenv_test_riscv (const fenv_t *envp, int ex)
{
  fenv_t env = *envp;
  int excepts;
 
  _FPU_SETROUND (0);
  asm volatile ("csrrs %0, fcsr, %1" : "=r"(excepts) : "r"(env));
 
  return excepts & ex;
}
 
#define libc_feupdateenv_test  libc_feupdateenv_test_riscv
#define libc_feupdateenv_testf libc_feupdateenv_test_riscv
#define libc_feupdateenv_testl libc_feupdateenv_test_riscv
 
static __always_inline void
libc_feupdateenv_riscv (const fenv_t *envp)
{
  fenv_t env = *envp;
 
  _FPU_SETROUND (0);
  asm volatile ("csrs fcsr, %0" : : "r"(env));
}
 
#define libc_feupdateenv  libc_feupdateenv_riscv
#define libc_feupdateenvf libc_feupdateenv_riscv
#define libc_feupdateenvl libc_feupdateenv_riscv
 
static __always_inline void
libc_feholdsetround_riscv (fenv_t *envp, int round)
{
  /* Note this implementation makes an improperly-formatted fenv_t and
     so should only be used in conjunction with libc_feresetround.  */
  int old_round;
  asm volatile ("csrrw %0, frm, %1" : "=r"(old_round) : "r"(round));
  *envp = old_round;
}
 
#define libc_feholdsetround  libc_feholdsetround_riscv
#define libc_feholdsetroundf libc_feholdsetround_riscv
#define libc_feholdsetroundl libc_feholdsetround_riscv
 
static __always_inline void
libc_feresetround_riscv (fenv_t *envp)
{
  /* Note this implementation takes an improperly-formatted fenv_t and
     so should only be used in conjunction with libc_feholdsetround.  */
  _FPU_SETROUND (*envp);
}
 
#define libc_feresetround  libc_feresetround_riscv
#define libc_feresetroundf libc_feresetround_riscv
#define libc_feresetroundl libc_feresetround_riscv
 
#include_next <math_private.h>
 
#endif