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/* Floating point environment. C-SKY version.
Copyright (C) 2018-2019 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
<https://www.gnu.org/licenses/>. */
#ifndef _FENV_H
# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
#endif
#ifdef __csky_hard_float__
/* Define bits representing the exception. We use the bit positions
of the appropriate bits in the FPU control word. */
enum
{
FE_INVALID =
#define FE_INVALID 0x01
FE_INVALID,
FE_DIVBYZERO =
#define FE_DIVBYZERO 0x02
FE_DIVBYZERO,
FE_OVERFLOW =
#define FE_OVERFLOW 0x04
FE_OVERFLOW,
FE_UNDERFLOW =
#define FE_UNDERFLOW 0x08
FE_UNDERFLOW,
FE_INEXACT =
#define FE_INEXACT 0x10
FE_INEXACT,
__FE_DENORMAL = 0x20
};
#define FE_ALL_EXCEPT \
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
/* The C-SKY FPU supports all of the four defined rounding modes. We
use again the bit positions in the FPU control word as the values
for the appropriate macros. */
enum
{
FE_TONEAREST =
#define FE_TONEAREST (0x0 << 24)
FE_TONEAREST,
FE_TOWARDZERO =
#define FE_TOWARDZERO (0x1 << 24)
FE_TOWARDZERO,
FE_UPWARD =
#define FE_UPWARD (0x2 << 24)
FE_UPWARD,
FE_DOWNWARD =
#define FE_DOWNWARD (0x3 << 24)
FE_DOWNWARD,
__FE_ROUND_MASK = (0x3 << 24)
};
#else
/* In the soft-float case, only rounding to nearest is supported, with
no exceptions. */
enum
{
__FE_UNDEFINED = -1,
FE_TONEAREST =
# define FE_TONEAREST 0x0
FE_TONEAREST
};
# define FE_ALL_EXCEPT 0
#endif
/* Type representing exception flags. */
typedef unsigned int fexcept_t;
/* Type representing floating-point environment. */
typedef struct
{
unsigned int __fpcr;
unsigned int __fpsr;
} fenv_t;
/* If the default argument is used we use this value. */
#define FE_DFL_ENV ((const fenv_t *) -1)
#if defined __USE_GNU && defined __csky_hard_float__
/* Floating-point environment where none of the exceptions are masked. */
# define FE_NOMASK_ENV ((const fenv_t *) -2)
#endif
#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
/* Type representing floating-point control modes. */
typedef unsigned int femode_t;
/* Default floating-point control modes. */
# define FE_DFL_MODE ((const femode_t *) -1L)
#endif
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