/** * 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; version (OSX) version = Darwin; else version (iOS) version = Darwin; else version (TVOS) version = Darwin; else version (WatchOS) version = Darwin; extern (C): @system: nothrow: @nogc: version (ARM) version = ARM_Any; version (AArch64) version = ARM_Any; version (HPPA) version = HPPA_Any; version (MIPS32) version = MIPS_Any; version (MIPS64) version = MIPS_Any; version (PPC) version = PPC_Any; version (PPC64) version = PPC_Any; version (RISCV32) version = RISCV_Any; version (RISCV64) version = RISCV_Any; version (S390) version = IBMZ_Any; version (SPARC) version = SPARC_Any; version (SPARC64) version = SPARC_Any; version (SystemZ) version = IBMZ_Any; version (X86) version = X86_Any; version (X86_64) version = X86_Any; 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/hppa/bits/fenv.h else version (HPPA_Any) { struct fenv_t { uint __status_word; uint[7] __exception; } alias fexcept_t = uint; } // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/mips/bits/fenv.h else version (MIPS_Any) { 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 (PPC_Any) { alias fenv_t = double; alias fexcept_t = uint; } // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/riscv/bits/fenv.h else version (RISCV_Any) { alias fenv_t = uint; alias fexcept_t = uint; } // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/sparc/fpu/bits/fenv.h else version (SPARC_Any) { import core.stdc.config : c_ulong; alias fenv_t = c_ulong; alias fexcept_t = c_ulong; } // https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/s390/fpu/bits/fenv.h else version (IBMZ_Any) { struct fenv_t { fexcept_t __fpc; void* __unused; } 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 (Darwin) { 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 (NetBSD) { version (X86_64) { struct fenv_t { struct _x87 { uint control; /* Control word register */ uint status; /* Status word register */ uint tag; /* Tag word register */ uint[4] others; /* EIP, Pointer Selector, etc */ } _x87 x87; uint mxcsr; /* Control and status register */ } } version (X86) { struct fenv_t { struct _x87 { ushort control; /* Control word register */ ushort unused1; ushort status; /* Status word register */ ushort unused2; ushort tag; /* Tag word register */ ushort unused3; uint[4] others; /* EIP, Pointer Selector, etc */ } _x87 x87; uint mxcsr; /* Control and status register */ } } alias uint fexcept_t; } else version (OpenBSD) { struct fenv_t { struct __x87 { uint __control; uint __status; uint __tag; uint[4] __others; } } uint __mxcsr; alias fexcept_t = uint; } else version (DragonFlyBSD) { struct fenv_t { struct _x87 { uint control; uint status; uint tag; uint[4] others; } _x87 x87; uint mxcsr; } alias uint 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 version (AArch64) { struct fenv_t { uint __control; uint __status; } alias uint fexcept_t; } else version (X86_64) { struct fenv_t { struct _x87 { uint __control; uint __status; uint __tag; uint[4] __others; } _x87 __x87; uint __mxcsr; } 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 version (CRuntime_Musl) { version (AArch64) { struct fenv_t { uint __fpcr; uint __fpsr; } alias uint fexcept_t; } else version (ARM) { import core.stdc.config : c_ulong; struct fenv_t { c_ulong __cw; } alias c_ulong fexcept_t; } else version (IBMZ_Any) { alias uint fenv_t; alias uint fexcept_t; } else version (MIPS_Any) { struct fenv_t { uint __cw; } alias ushort fexcept_t; } else version (PPC_Any) { alias double fenv_t; alias uint fexcept_t; } else version (X86_Any) { 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; version (X86_64) uint __mxcsr; } alias ushort fexcept_t; } else { static assert(false, "Architecture not supported."); } } else version (CRuntime_UClibc) { 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; } 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; } else version (MIPS_Any) { struct fenv_t { uint __fp_control_register; } alias fexcept_t = ushort; } else version (ARM) { struct fenv_t { uint __cw; } alias fexcept_t = uint; } else { static assert(false, "Architecture not supported."); } } 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 version (Solaris) { version (SPARC_Any) { enum { FE_TONEAREST = 0, FE_TOWARDZERO = 1, FE_UPWARD = 2, FE_DOWNWARD = 3, } enum { FE_INEXACT = 0x01, FE_DIVBYZERO = 0x02, FE_UNDERFLOW = 0x04, FE_OVERFLOW = 0x08, FE_INVALID = 0x10, FE_ALL_EXCEPT = 0x1f, } } else version (X86_Any) { enum { FE_TONEAREST = 0, FE_DOWNWARD = 1, FE_UPWARD = 2, FE_TOWARDZERO = 3, } enum { FE_INVALID = 0x01, FE_DIVBYZERO = 0x04, FE_OVERFLOW = 0x08, FE_UNDERFLOW = 0x10, FE_INEXACT = 0x20, FE_ALL_EXCEPT = 0x3d, } } else { static assert(0, "Unimplemented architecture"); } } else { version (X86) { // Define bits representing the exception. enum { FE_INVALID = 0x01, /// FE_DENORMAL = 0x02, /// non-standard FE_DIVBYZERO = 0x04, /// FE_OVERFLOW = 0x08, /// FE_UNDERFLOW = 0x10, /// FE_INEXACT = 0x20, /// FE_ALL_EXCEPT = 0x3F, /// } // The ix87 FPU supports all of the four defined rounding modes. enum { FE_TONEAREST = 0, /// FE_DOWNWARD = 0x400, /// FE_UPWARD = 0x800, /// FE_TOWARDZERO = 0xC00, /// } } else version (X86_64) { // Define bits representing the exception. enum { FE_INVALID = 0x01, /// FE_DENORMAL = 0x02, /// non-standard FE_DIVBYZERO = 0x04, /// FE_OVERFLOW = 0x08, /// FE_UNDERFLOW = 0x10, /// FE_INEXACT = 0x20, /// FE_ALL_EXCEPT = 0x3F, /// } // The ix87 FPU supports all of the four defined rounding modes. enum { FE_TONEAREST = 0, /// FE_DOWNWARD = 0x400, /// FE_UPWARD = 0x800, /// FE_TOWARDZERO = 0xC00, /// } } else version (ARM_Any) { // Define bits representing exceptions in the FPU status word. enum { FE_INVALID = 1, /// FE_DIVBYZERO = 2, /// FE_OVERFLOW = 4, /// FE_UNDERFLOW = 8, /// FE_INEXACT = 16, /// FE_ALL_EXCEPT = 31, /// } // VFP supports all of the four defined rounding modes. enum { FE_TONEAREST = 0, /// FE_UPWARD = 0x400000, /// FE_DOWNWARD = 0x800000, /// FE_TOWARDZERO = 0xC00000, /// } } else version (HPPA_Any) { // Define bits representing the exception. enum { FE_INEXACT = 0x01, /// FE_UNDERFLOW = 0x02, /// FE_OVERFLOW = 0x04, /// FE_DIVBYZERO = 0x08, /// FE_INVALID = 0x10, /// FE_ALL_EXCEPT = 0x1F, /// } // The HPPA FPU supports all of the four defined rounding modes. enum { FE_TONEAREST = 0x0, /// FE_TOWARDZERO = 0x200, /// FE_UPWARD = 0x400, /// FE_DOWNWARD = 0x600, /// } } else version (MIPS_Any) { // Define bits representing the exception. enum { FE_INEXACT = 0x04, /// FE_UNDERFLOW = 0x08, /// FE_OVERFLOW = 0x10, /// FE_DIVBYZERO = 0x20, /// FE_INVALID = 0x40, /// FE_ALL_EXCEPT = 0x7C, /// } // The MIPS FPU supports all of the four defined rounding modes. enum { FE_TONEAREST = 0x0, /// FE_TOWARDZERO = 0x1, /// FE_UPWARD = 0x2, /// FE_DOWNWARD = 0x3, /// } } else version (PPC_Any) { // Define bits representing the exception. enum { FE_INEXACT = 0x2000000, /// FE_DIVBYZERO = 0x4000000, /// FE_UNDERFLOW = 0x8000000, /// FE_OVERFLOW = 0x10000000, /// FE_INVALID = 0x20000000, /// FE_INVALID_SNAN = 0x1000000, /// non-standard FE_INVALID_ISI = 0x800000, /// non-standard FE_INVALID_IDI = 0x400000, /// non-standard FE_INVALID_ZDZ = 0x200000, /// non-standard FE_INVALID_IMZ = 0x100000, /// non-standard FE_INVALID_COMPARE = 0x80000, /// non-standard FE_INVALID_SOFTWARE = 0x400, /// non-standard FE_INVALID_SQRT = 0x200, /// non-standard FE_INVALID_INTEGER_CONVERSION = 0x100, /// non-standard FE_ALL_INVALID = 0x1F80700, /// non-standard FE_ALL_EXCEPT = 0x3E000000, /// } // PowerPC chips support all of the four defined rounding modes. enum { FE_TONEAREST = 0, /// FE_TOWARDZERO = 1, /// FE_UPWARD = 2, /// FE_DOWNWARD = 3, /// } } else version (RISCV_Any) { // Define bits representing exceptions in the FPSR status word. enum { FE_INEXACT = 0x01, /// FE_UNDERFLOW = 0x02, /// FE_OVERFLOW = 0x04, /// FE_DIVBYZERO = 0x08, /// FE_INVALID = 0x10, /// FE_ALL_EXCEPT = 0x1f, /// } // Define bits representing rounding modes in the FPCR Rmode field. enum { FE_TONEAREST = 0x0, /// FE_TOWARDZERO = 0x1, /// FE_DOWNWARD = 0x2, /// FE_UPWARD = 0x3, /// } } else version (SPARC_Any) { // Define bits representing the exception. enum { FE_INVALID = 0x200, /// FE_OVERFLOW = 0x100, /// FE_UNDERFLOW = 0x80, /// FE_DIVBYZERO = 0x40, /// FE_INEXACT = 0x20, /// FE_ALL_EXCEPT = 0x3E0, /// } // The Sparc FPU supports all of the four defined rounding modes. enum { FE_TONEAREST = 0x0, /// FE_TOWARDZERO = 0x40000000, /// FE_UPWARD = 0x80000000, /// FE_DOWNWARD = 0xc0000000, /// } } else version (IBMZ_Any) { // Define bits representing the exception. enum { FE_INVALID = 0x80, /// FE_DIVBYZERO = 0x40, /// FE_OVERFLOW = 0x20, /// FE_UNDERFLOW = 0x10, /// FE_INEXACT = 0x08, /// FE_ALL_EXCEPT = 0xF8, /// } // SystemZ supports all of the four defined rounding modes. enum { FE_TONEAREST = 0x0, /// FE_DOWNWARD = 0x3, /// FE_UPWARD = 0x2, /// FE_TOWARDZERO = 0x1, /// } } else { static assert(0, "Unimplemented architecture"); } } 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 (Darwin) { 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 (NetBSD) { private extern const fenv_t __fe_dfl_env; /// enum FE_DFL_ENV = &__fe_dfl_env; } else version (OpenBSD) { private extern const fenv_t __fe_dfl_env; /// enum FE_DFL_ENV = &__fe_dfl_env; } else version (DragonFlyBSD) { 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 version (CRuntime_Musl) { /// enum FE_DFL_ENV = cast(fenv_t*)(-1); } else version (CRuntime_UClibc) { /// enum FE_DFL_ENV = cast(fenv_t*)(-1); } 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(const scope fexcept_t* flagp, int excepts); /// int fegetround(); /// int fesetround(int round); /// int fegetenv(fenv_t* envp); /// int fesetenv(const scope 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()(const scope 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(const scope fenv_t* envp); }