/usr/lib/gcc/x86_64-linux-gnu/6/include/d/core/stdc/fenv.d is in libgphobos-6-dev 6.4.0-17ubuntu1.
This file is owned by root:root, with mode 0o644.
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* D header file for C99.
*
* $(C_HEADER_DESCRIPTION pubs.opengroup.org/onlinepubs/009695399/basedefs/_fenv.h.html, _fenv.h)
*
* Copyright: Copyright Sean Kelly 2005 - 2009.
* License: Distributed under the
* $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
* (See accompanying file LICENSE)
* Authors: Sean Kelly
* Source: $(DRUNTIMESRC core/stdc/_fenv.d)
* Standards: ISO/IEC 9899:1999 (E)
*/
module core.stdc.fenv;
extern (C):
@system:
nothrow:
@nogc:
version( MinGW )
version = GNUFP;
version( CRuntime_Glibc )
version = GNUFP;
version( GNUFP )
{
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86/fpu/bits/fenv.h
version (X86)
{
struct fenv_t
{
ushort __control_word;
ushort __unused1;
ushort __status_word;
ushort __unused2;
ushort __tags;
ushort __unused3;
uint __eip;
ushort __cs_selector;
ushort __opcode;
uint __data_offset;
ushort __data_selector;
ushort __unused5;
}
alias fexcept_t = ushort;
}
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86/fpu/bits/fenv.h
else version (X86_64)
{
struct fenv_t
{
ushort __control_word;
ushort __unused1;
ushort __status_word;
ushort __unused2;
ushort __tags;
ushort __unused3;
uint __eip;
ushort __cs_selector;
ushort __opcode;
uint __data_offset;
ushort __data_selector;
ushort __unused5;
uint __mxcsr;
}
alias fexcept_t = ushort;
}
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/mips/bits/fenv.h
else version (MIPS32)
{
struct fenv_t
{
uint __fp_control_register;
}
alias fexcept_t = ushort;
}
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/mips/bits/fenv.h
else version (MIPS64)
{
struct fenv_t
{
uint __fp_control_register;
}
alias fexcept_t = ushort;
}
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/aarch64/bits/fenv.h
else version (AArch64)
{
struct fenv_t
{
uint __fpcr;
uint __fpsr;
}
alias fexcept_t = uint;
}
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/arm/bits/fenv.h
else version (ARM)
{
struct fenv_t
{
uint __cw;
}
alias fexcept_t = uint;
}
// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/powerpc/bits/fenv.h
else version (PPC64)
{
alias fenv_t = double;
alias fexcept_t = uint;
}
else
{
static assert(0, "Unimplemented architecture");
}
}
else version( CRuntime_DigitalMars )
{
struct fenv_t
{
ushort status;
ushort control;
ushort round;
ushort[2] reserved;
}
alias fexcept_t = int;
}
else version( CRuntime_Microsoft )
{
struct fenv_t
{
uint ctl;
uint stat;
}
alias fexcept_t = uint;
}
else version ( OSX )
{
version ( BigEndian )
{
alias uint fenv_t;
alias uint fexcept_t;
}
version ( LittleEndian )
{
struct fenv_t
{
ushort __control;
ushort __status;
uint __mxcsr;
byte[8] __reserved;
}
alias ushort fexcept_t;
}
}
else version ( FreeBSD )
{
struct fenv_t
{
ushort __control;
ushort __mxcsr_hi;
ushort __status;
ushort __mxcsr_lo;
uint __tag;
byte[16] __other;
}
alias ushort fexcept_t;
}
else version( CRuntime_Bionic )
{
version(X86)
{
struct fenv_t
{
ushort __control;
ushort __mxcsr_hi;
ushort __status;
ushort __mxcsr_lo;
uint __tag;
byte[16] __other;
}
alias ushort fexcept_t;
}
else version(ARM)
{
alias uint fenv_t;
alias uint fexcept_t;
}
else
{
static assert(false, "Architecture not supported.");
}
}
else version( Solaris )
{
import core.stdc.config : c_ulong;
enum FEX_NUM_EXC = 12;
struct fex_handler_t
{
int __mode;
void function() __handler;
}
struct fenv_t
{
fex_handler_t[FEX_NUM_EXC] __handler;
c_ulong __fsr;
}
alias int fexcept_t;
}
else
{
static assert( false, "Unsupported platform" );
}
version( CRuntime_Microsoft )
{
enum
{
FE_INEXACT = 1, ///
FE_UNDERFLOW = 2, ///
FE_OVERFLOW = 4, ///
FE_DIVBYZERO = 8, ///
FE_INVALID = 0x10, ///
FE_ALL_EXCEPT = 0x1F, ///
FE_TONEAREST = 0, ///
FE_UPWARD = 0x100, ///
FE_DOWNWARD = 0x200, ///
FE_TOWARDZERO = 0x300, ///
}
}
else
{
enum
{
FE_INVALID = 1, ///
FE_DENORMAL = 2, /// non-standard
FE_DIVBYZERO = 4, ///
FE_OVERFLOW = 8, ///
FE_UNDERFLOW = 0x10, ///
FE_INEXACT = 0x20, ///
FE_ALL_EXCEPT = 0x3F, ///
FE_TONEAREST = 0, ///
FE_UPWARD = 0x800, ///
FE_DOWNWARD = 0x400, ///
FE_TOWARDZERO = 0xC00, ///
}
}
version( GNUFP )
{
///
enum FE_DFL_ENV = cast(fenv_t*)(-1);
}
else version( CRuntime_DigitalMars )
{
private extern __gshared fenv_t _FE_DFL_ENV;
///
enum fenv_t* FE_DFL_ENV = &_FE_DFL_ENV;
}
else version( CRuntime_Microsoft )
{
private extern __gshared fenv_t _Fenv0;
///
enum FE_DFL_ENV = &_Fenv0;
}
else version( OSX )
{
private extern __gshared fenv_t _FE_DFL_ENV;
///
enum FE_DFL_ENV = &_FE_DFL_ENV;
}
else version( FreeBSD )
{
private extern const fenv_t __fe_dfl_env;
///
enum FE_DFL_ENV = &__fe_dfl_env;
}
else version( CRuntime_Bionic )
{
private extern const fenv_t __fe_dfl_env;
///
enum FE_DFL_ENV = &__fe_dfl_env;
}
else version( Solaris )
{
private extern const fenv_t __fenv_def_env;
///
enum FE_DFL_ENV = &__fenv_def_env;
}
else
{
static assert( false, "Unsupported platform" );
}
///
int feclearexcept(int excepts);
///
int fetestexcept(int excepts);
///
int feholdexcept(fenv_t* envp);
///
int fegetexceptflag(fexcept_t* flagp, int excepts);
///
int fesetexceptflag(in fexcept_t* flagp, int excepts);
///
int fegetround();
///
int fesetround(int round);
///
int fegetenv(fenv_t* envp);
///
int fesetenv(in fenv_t* envp);
// MS define feraiseexcept() and feupdateenv() inline.
version( CRuntime_Microsoft ) // supported since MSVCRT 12 (VS 2013) only
{
///
int feraiseexcept()(int excepts)
{
struct Entry
{
int exceptVal;
double num;
double denom;
}
static __gshared immutable(Entry[5]) table =
[ // Raise exception by evaluating num / denom:
{ FE_INVALID, 0.0, 0.0 },
{ FE_DIVBYZERO, 1.0, 0.0 },
{ FE_OVERFLOW, 1e+300, 1e-300 },
{ FE_UNDERFLOW, 1e-300, 1e+300 },
{ FE_INEXACT, 2.0, 3.0 }
];
if ((excepts &= FE_ALL_EXCEPT) == 0)
return 0;
// Raise the exceptions not masked:
double ans = void;
foreach (i; 0 .. table.length)
{
if ((excepts & table[i].exceptVal) != 0)
ans = table[i].num / table[i].denom;
}
return 0;
}
///
int feupdateenv()(in fenv_t* envp)
{
int excepts = fetestexcept(FE_ALL_EXCEPT);
return (fesetenv(envp) != 0 || feraiseexcept(excepts) != 0 ? 1 : 0);
}
}
else
{
///
int feraiseexcept(int excepts);
///
int feupdateenv(in fenv_t* envp);
}
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