mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/* Copyright (C) 2000-2025 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
|
|
|
|
/* Define bits representing the exception. We use the values of the
|
|
appropriate enable bits in the FPU status word (which,
|
|
coincidentally, are the same as the flag bits, but shifted right by
|
|
27 bits). */
|
|
enum
|
|
{
|
|
FE_INVALID =
|
|
#define FE_INVALID (1<<4) /* V */
|
|
FE_INVALID,
|
|
FE_DIVBYZERO =
|
|
#define FE_DIVBYZERO (1<<3) /* Z */
|
|
FE_DIVBYZERO,
|
|
FE_OVERFLOW =
|
|
#define FE_OVERFLOW (1<<2) /* O */
|
|
FE_OVERFLOW,
|
|
FE_UNDERFLOW =
|
|
#define FE_UNDERFLOW (1<<1) /* U */
|
|
FE_UNDERFLOW,
|
|
FE_INEXACT =
|
|
#define FE_INEXACT (1<<0) /* I */
|
|
FE_INEXACT,
|
|
};
|
|
|
|
#define FE_ALL_EXCEPT \
|
|
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
|
|
|
|
/* The PA-RISC FPU supports all of the four defined rounding modes.
|
|
We use the values of the RM field in the floating point status
|
|
register for the appropriate macros. */
|
|
enum
|
|
{
|
|
FE_TONEAREST =
|
|
#define FE_TONEAREST (0 << 9)
|
|
FE_TONEAREST,
|
|
FE_TOWARDZERO =
|
|
#define FE_TOWARDZERO (1 << 9)
|
|
FE_TOWARDZERO,
|
|
FE_UPWARD =
|
|
#define FE_UPWARD (2 << 9)
|
|
FE_UPWARD,
|
|
FE_DOWNWARD =
|
|
#define FE_DOWNWARD (3 << 9)
|
|
FE_DOWNWARD,
|
|
};
|
|
|
|
/* Type representing exception flags. */
|
|
typedef unsigned int fexcept_t;
|
|
|
|
/* Type representing floating-point environment. This structure
|
|
corresponds to the layout of the status and exception words in the
|
|
register file. The exception registers are never saved/stored by
|
|
userspace. This structure is also not correctly aligned ever, in
|
|
an ABI error we left out __aligned(8) and subsequently all of our
|
|
fenv functions must accept unaligned input, align the input, and
|
|
then use assembly to store fr0. This is a performance hit, but
|
|
means the ABI is stable. */
|
|
typedef struct
|
|
{
|
|
unsigned int __status_word;
|
|
unsigned int __exception[7];
|
|
} fenv_t;
|
|
|
|
/* If the default argument is used we use this value. */
|
|
#define FE_DFL_ENV ((const fenv_t *) -1)
|
|
|
|
#ifdef __USE_GNU
|
|
/* 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_C23)
|
|
/* 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
|