-/* Copyright (C) 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2019 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 Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ 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."
enum
{
- FE_INEXACT = 1UL << 21,
-#define FE_INEXACT FE_INEXACT
+#ifdef __USE_GNU
+ FE_DENORMAL =
+#define FE_DENORMAL (1 << 22)
+ FE_DENORMAL,
+#endif
- FE_UNDERFLOW = 1UL << 20,
-#define FE_UNDERFLOW FE_UNDERFLOW
+ FE_INEXACT =
+#define FE_INEXACT (1 << 21)
+ FE_INEXACT,
- FE_OVERFLOW = 1UL << 19,
-#define FE_OVERFLOW FE_OVERFLOW
+ FE_UNDERFLOW =
+#define FE_UNDERFLOW (1 << 20)
+ FE_UNDERFLOW,
- FE_DIVBYZERO = 1UL << 18,
-#define FE_DIVBYZERO FE_DIVBYZERO
+ FE_OVERFLOW =
+#define FE_OVERFLOW (1 << 19)
+ FE_OVERFLOW,
- FE_INVALID = 1UL << 17,
-#define FE_INVALID FE_INVALID
+ FE_DIVBYZERO =
+#define FE_DIVBYZERO (1 << 18)
+ FE_DIVBYZERO,
+
+ FE_INVALID =
+#define FE_INVALID (1 << 17)
+ FE_INVALID,
FE_ALL_EXCEPT =
- (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
-#define FE_ALL_EXCEPT FE_ALL_EXCEPT
+#define FE_ALL_EXCEPT (0x3f << 17)
+ FE_ALL_EXCEPT
};
-
/* Alpha chips support all four defined rouding modes.
Note that code must be compiled to use dynamic rounding (/d) instructions
enum
{
- FE_TOWARDSZERO = 0,
-#define FE_TOWARDSZERO FE_TOWARDSZERO
+ FE_TOWARDZERO =
+#define FE_TOWARDZERO 0
+ FE_TOWARDZERO,
- FE_DOWNWARD = 1,
-#define FE_DOWNWARD FE_DOWNWARD
+ FE_DOWNWARD =
+#define FE_DOWNWARD 1
+ FE_DOWNWARD,
- FE_TONEAREST = 2,
-#define FE_TONEAREST FE_TONEAREST
+ FE_TONEAREST =
+#define FE_TONEAREST 2
+ FE_TONEAREST,
- FE_UPWARD = 3,
-#define FE_UPWARD FE_UPWARD
+ FE_UPWARD =
+#define FE_UPWARD 3
+ FE_UPWARD,
};
+#ifdef __USE_GNU
+/* On later hardware, and later kernels for earlier hardware, we can forcibly
+ underflow denormal inputs and outputs. This can speed up certain programs
+ significantly, usually without affecting accuracy. */
+enum
+ {
+ FE_MAP_DMZ = 1UL << 12, /* Map denorm inputs to zero */
+#define FE_MAP_DMZ FE_MAP_DMZ
+
+ FE_MAP_UMZ = 1UL << 13, /* Map underflowed outputs to zero */
+#define FE_MAP_UMZ FE_MAP_UMZ
+ };
+#endif
/* Type representing exception flags. */
-typedef unsigned long fexcept_t;
+typedef unsigned long int fexcept_t;
/* Type representing floating-point environment. */
-typedef unsigned long fenv_t;
+typedef unsigned long int fenv_t;
/* If the default argument is used we use this value. Note that due to
architecture-specified page mappings, no user-space pointer will ever
have its two high bits set. Co-opt one. */
-#define FE_DFL_ENV ((fenv_t *) 0x8800000000000000UL)
+#define FE_DFL_ENV ((const fenv_t *) 0x8800000000000000UL)
#ifdef __USE_GNU
/* Floating-point environment where none of the exceptions are masked. */
-# define FE_NOMASK_ENV ((fenv_t *) 0x880000000000003eUL)
+# define FE_NOMASK_ENV ((const fenv_t *) 0x880000000000003eUL)
+
+/* Floating-point environment with (processor-dependent) non-IEEE floating
+ point. In this case, mapping denormals to zero. */
+# define FE_NONIEEE_ENV ((const fenv_t *) 0x8800000000003000UL)
#endif
/* The system calls to talk to the kernel's FP code. */
-extern unsigned long int __ieee_get_fp_control __P ((void));
-extern void __ieee_set_fp_control __P ((unsigned long int __value));
+extern unsigned long int __ieee_get_fp_control (void) __THROW;
+extern void __ieee_set_fp_control (unsigned long int __value) __THROW;
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
+/* Type representing floating-point control modes. */
+typedef unsigned long int femode_t;
+
+/* Default floating-point control modes. */
+# define FE_DFL_MODE ((const femode_t *) 0x8800000000000000UL)
+#endif
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