/* Copyright (C) 1997-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _FENV_H

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# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."

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#endif

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/* Define bits representing the exception. We use the bit positions

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of the appropriate bits in the FPU control word. */

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enum

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{

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FE_INVALID =

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#define FE_INVALID 0x01

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FE_INVALID,

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__FE_DENORM = 0x02,

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FE_DIVBYZERO =

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#define FE_DIVBYZERO 0x04

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FE_DIVBYZERO,

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FE_OVERFLOW =

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#define FE_OVERFLOW 0x08

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FE_OVERFLOW,

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FE_UNDERFLOW =

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#define FE_UNDERFLOW 0x10

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FE_UNDERFLOW,

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FE_INEXACT =

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#define FE_INEXACT 0x20

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FE_INEXACT

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};

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#define FE_ALL_EXCEPT \

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(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)

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/* The ix87 FPU supports all of the four defined rounding modes. We

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use again the bit positions in the FPU control word as the values

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for the appropriate macros. */

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enum

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{

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FE_TONEAREST =

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#define FE_TONEAREST 0

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FE_TONEAREST,

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FE_DOWNWARD =

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#define FE_DOWNWARD 0x400

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FE_DOWNWARD,

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FE_UPWARD =

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#define FE_UPWARD 0x800

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FE_UPWARD,

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FE_TOWARDZERO =

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#define FE_TOWARDZERO 0xc00

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FE_TOWARDZERO

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};

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/* Type representing exception flags. */

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typedef unsigned short int fexcept_t;

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/* Type representing floating-point environment. This structure

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corresponds to the layout of the block written by the `fstenv'

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instruction and has additional fields for the contents of the MXCSR

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register as written by the `stmxcsr' instruction. */

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typedef struct

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{

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unsigned short int __control_word;

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unsigned short int __glibc_reserved1;

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unsigned short int __status_word;

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unsigned short int __glibc_reserved2;

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unsigned short int __tags;

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unsigned short int __glibc_reserved3;

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unsigned int __eip;

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unsigned short int __cs_selector;

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unsigned int __opcode:11;

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unsigned int __glibc_reserved4:5;

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unsigned int __data_offset;

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unsigned short int __data_selector;

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unsigned short int __glibc_reserved5;

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#ifdef __x86_64__

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unsigned int __mxcsr;

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#endif

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}

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fenv_t;

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/* If the default argument is used we use this value. */

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#define FE_DFL_ENV ((const fenv_t *) -1)

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#ifdef __USE_GNU

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/* Floating-point environment where none of the exception is masked. */

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# define FE_NOMASK_ENV ((const fenv_t *) -2)

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#endif

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#if __GLIBC_USE (IEC_60559_BFP_EXT)

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/* Type representing floating-point control modes. */

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typedef struct

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{

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unsigned short int __control_word;

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unsigned short int __glibc_reserved;

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unsigned int __mxcsr;

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}

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femode_t;

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/* Default floating-point control modes. */

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# define FE_DFL_MODE ((const femode_t *) -1L)

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#endif

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#ifdef __USE_EXTERN_INLINES

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__BEGIN_DECLS

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/* Optimized versions. */

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#ifndef _LIBC

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extern int __REDIRECT_NTH (__feraiseexcept_renamed, (int), feraiseexcept);

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#endif

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__extern_always_inline void

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__NTH (__feraiseexcept_invalid_divbyzero (int __excepts))

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{

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if ((FE_INVALID & __excepts) != 0)

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{

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/* One example of an invalid operation is 0.0 / 0.0. */

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float __f = 0.0;

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# ifdef __SSE_MATH__

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__asm__ __volatile__ ("divss %0, %0 " : "+x" (__f));

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# else

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__asm__ __volatile__ ("fdiv %%st, %%st(0); fwait"

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: "=t" (__f) : "0" (__f));

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# endif

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(void) &__f;

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}

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if ((FE_DIVBYZERO & __excepts) != 0)

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{

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float __f = 1.0;

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float __g = 0.0;

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# ifdef __SSE_MATH__

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__asm__ __volatile__ ("divss %1, %0" : "+x" (__f) : "x" (__g));

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# else

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__asm__ __volatile__ ("fdivp %%st, %%st(1); fwait"

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: "=t" (__f) : "0" (__f), "u" (__g) : "st(1)");

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# endif

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(void) &__f;

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}

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}

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__extern_inline int

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__NTH (feraiseexcept (int __excepts))

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{

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if (__builtin_constant_p (__excepts)

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&& (__excepts & ~(FE_INVALID | FE_DIVBYZERO)) == 0)

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{

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__feraiseexcept_invalid_divbyzero (__excepts);

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return 0;

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}

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return __feraiseexcept_renamed (__excepts);

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}

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__END_DECLS

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#endif

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