Nim - This repository contains the Nim compiler, Nim's stdlib, tools, and documentation. (mirror)

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# # # Nim's Runtime Library # (c) Copyright 2015 Andreas Rumpf # # See the file "copying.txt", included in this # distribution, for details about the copyright. # ## Floating-point environment. Handling of floating-point rounding and ## exceptions (overflow, division by zero, etc.). {.deadCodeElim:on.} when defined(Posix) and not defined(haiku): {.passl: "-lm".} var FE_DIVBYZERO* {.importc, header: "<fenv.h>".}: cint ## division by zero FE_INEXACT* {.importc, header: "<fenv.h>".}: cint ## inexact result FE_INVALID* {.importc, header: "<fenv.h>".}: cint ## invalid operation FE_OVERFLOW* {.importc, header: "<fenv.h>".}: cint ## result not representable due to overflow FE_UNDERFLOW* {.importc, header: "<fenv.h>".}: cint ## result not representable due to underflow FE_ALL_EXCEPT* {.importc, header: "<fenv.h>".}: cint ## bitwise OR of all supported exceptions FE_DOWNWARD* {.importc, header: "<fenv.h>".}: cint ## round toward -Inf FE_TONEAREST* {.importc, header: "<fenv.h>".}: cint ## round to nearest FE_TOWARDZERO* {.importc, header: "<fenv.h>".}: cint ## round toward 0 FE_UPWARD* {.importc, header: "<fenv.h>".}: cint ## round toward +Inf FE_DFL_ENV* {.importc, header: "<fenv.h>".}: cint ## macro of type pointer to fenv_t to be used as the argument ## to functions taking an argument of type fenv_t; in this ## case the default environment will be used type Tfenv* {.importc: "fenv_t", header: "<fenv.h>", final, pure.} = object ## Represents the entire floating-point environment. The ## floating-point environment refers collectively to any ## floating-point status flags and control modes supported ## by the implementation. Tfexcept* {.importc: "fexcept_t", header: "<fenv.h>", final, pure.} = object ## Represents the floating-point status flags collectively, ## including any status the implementation associates with the ## flags. A floating-point status flag is a system variable ## whose value is set (but never cleared) when a floating-point ## exception is raised, which occurs as a side effect of ## exceptional floating-point arithmetic to provide auxiliary ## information. A floating-point control mode is a system variable ## whose value may be set by the user to affect the subsequent ## behavior of floating-point arithmetic. proc feclearexcept*(excepts: cint): cint {.importc, header: "<fenv.h>".} ## Clear the supported exceptions represented by `excepts`. proc fegetexceptflag*(flagp: ptr Tfexcept, excepts: cint): cint {. importc, header: "<fenv.h>".} ## Store implementation-defined representation of the exception flags ## indicated by `excepts` in the object pointed to by `flagp`. proc feraiseexcept*(excepts: cint): cint {.importc, header: "<fenv.h>".} ## Raise the supported exceptions represented by `excepts`. proc fesetexceptflag*(flagp: ptr Tfexcept, excepts: cint): cint {. importc, header: "<fenv.h>".} ## Set complete status for exceptions indicated by `excepts` according to ## the representation in the object pointed to by `flagp`. proc fetestexcept*(excepts: cint): cint {.importc, header: "<fenv.h>".} ## Determine which of subset of the exceptions specified by `excepts` are ## currently set. proc fegetround*(): cint {.importc, header: "<fenv.h>".} ## Get current rounding direction. proc fesetround*(roundingDirection: cint): cint {.importc, header: "<fenv.h>".} ## Establish the rounding direction represented by `roundingDirection`. proc fegetenv*(envp: ptr Tfenv): cint {.importc, header: "<fenv.h>".} ## Store the current floating-point environment in the object pointed ## to by `envp`. proc feholdexcept*(envp: ptr Tfenv): cint {.importc, header: "<fenv.h>".} ## Save the current environment in the object pointed to by `envp`, clear ## exception flags and install a non-stop mode (if available) for all ## exceptions. proc fesetenv*(a1: ptr Tfenv): cint {.importc, header: "<fenv.h>".} ## Establish the floating-point environment represented by the object ## pointed to by `envp`. proc feupdateenv*(envp: ptr Tfenv): cint {.importc, header: "<fenv.h>".} ## Save current exceptions in temporary storage, install environment ## represented by object pointed to by `envp` and raise exceptions ## according to saved exceptions. var FP_RADIX_INTERNAL {. importc: "FLT_RADIX" header: "<float.h>" .} : int template fpRadix* : int = FP_RADIX_INTERNAL ## The (integer) value of the radix used to represent any floating ## point type on the architecture used to build the program. var FLT_MANT_DIG {. importc: "FLT_MANT_DIG" header: "<float.h>" .} : int var FLT_DIG {. importc: "FLT_DIG" header: "<float.h>" .} : int var FLT_MIN_EXP {. importc: "FLT_MIN_EXP" header: "<float.h>" .} : int var FLT_MAX_EXP {. importc: "FLT_MAX_EXP" header: "<float.h>" .} : int var FLT_MIN_10_EXP {. importc: "FLT_MIN_10_EXP" header: "<float.h>" .} : int var FLT_MAX_10_EXP {. importc: "FLT_MAX_10_EXP" header: "<float.h>" .} : int var FLT_MIN {. importc: "FLT_MIN" header: "<float.h>" .} : cfloat var FLT_MAX {. importc: "FLT_MAX" header: "<float.h>" .} : cfloat var FLT_EPSILON {. importc: "FLT_EPSILON" header: "<float.h>" .} : cfloat var DBL_MANT_DIG {. importc: "DBL_MANT_DIG" header: "<float.h>" .} : int var DBL_DIG {. importc: "DBL_DIG" header: "<float.h>" .} : int var DBL_MIN_EXP {. importc: "DBL_MIN_EXP" header: "<float.h>" .} : int var DBL_MAX_EXP {. importc: "DBL_MAX_EXP" header: "<float.h>" .} : int var DBL_MIN_10_EXP {. importc: "DBL_MIN_10_EXP" header: "<float.h>" .} : int var DBL_MAX_10_EXP {. importc: "DBL_MAX_10_EXP" header: "<float.h>" .} : int var DBL_MIN {. importc: "DBL_MIN" header: "<float.h>" .} : cdouble var DBL_MAX {. importc: "DBL_MAX" header: "<float.h>" .} : cdouble var DBL_EPSILON {. importc: "DBL_EPSILON" header: "<float.h>" .} : cdouble template mantissaDigits*(T : typedesc[float32]) : int = FLT_MANT_DIG ## Number of digits (in base ``floatingPointRadix``) in the mantissa ## of 32-bit floating-point numbers. template digits*(T : typedesc[float32]) : int = FLT_DIG ## Number of decimal digits that can be represented in a ## 32-bit floating-point type without losing precision. template minExponent*(T : typedesc[float32]) : int = FLT_MIN_EXP ## Minimum (negative) exponent for 32-bit floating-point numbers. template maxExponent*(T : typedesc[float32]) : int = FLT_MAX_EXP ## Maximum (positive) exponent for 32-bit floating-point numbers. template min10Exponent*(T : typedesc[float32]) : int = FLT_MIN_10_EXP ## Minimum (negative) exponent in base 10 for 32-bit floating-point ## numbers. template max10Exponent*(T : typedesc[float32]) : int = FLT_MAX_10_EXP ## Maximum (positive) exponent in base 10 for 32-bit floating-point ## numbers. template minimumPositiveValue*(T : typedesc[float32]) : float32 = FLT_MIN ## The smallest positive (nonzero) number that can be represented in a ## 32-bit floating-point type. template maximumPositiveValue*(T : typedesc[float32]) : float32 = FLT_MAX ## The largest positive number that can be represented in a 32-bit ## floating-point type. template epsilon*(T : typedesc[float32]): float32 = FLT_EPSILON ## The difference between 1.0 and the smallest number greater than ## 1.0 that can be represented in a 32-bit floating-point type. template mantissaDigits*(T : typedesc[float64]) : int = DBL_MANT_DIG ## Number of digits (in base ``floatingPointRadix``) in the mantissa ## of 64-bit floating-point numbers. template digits*(T : typedesc[float64]) : int = DBL_DIG ## Number of decimal digits that can be represented in a ## 64-bit floating-point type without losing precision. template minExponent*(T : typedesc[float64]) : int = DBL_MIN_EXP ## Minimum (negative) exponent for 64-bit floating-point numbers. template maxExponent*(T : typedesc[float64]) : int = DBL_MAX_EXP ## Maximum (positive) exponent for 64-bit floating-point numbers. template min10Exponent*(T : typedesc[float64]) : int = DBL_MIN_10_EXP ## Minimum (negative) exponent in base 10 for 64-bit floating-point ## numbers. template max10Exponent*(T : typedesc[float64]) : int = DBL_MAX_10_EXP ## Maximum (positive) exponent in base 10 for 64-bit floating-point ## numbers. template minimumPositiveValue*(T : typedesc[float64]) : float64 = DBL_MIN ## The smallest positive (nonzero) number that can be represented in a ## 64-bit floating-point type. template maximumPositiveValue*(T : typedesc[float64]) : float64 = DBL_MAX ## The largest positive number that can be represented in a 64-bit ## floating-point type. template epsilon*(T : typedesc[float64]): float64 = DBL_EPSILON ## The difference between 1.0 and the smallest number greater than ## 1.0 that can be represented in a 64-bit floating-point type.


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