floatFractionalBits

Returns the number of fractional bits in the mantissa of floating point type T.

Function parameters

Parameters

T:type

Functions in this namespace

Functions

FloatRepr
floatExponentBits: Returns the number of bits in the exponent of floating point type T.
floatMantissaBits: Returns the number of bits in the mantissa of floating point type T.
floatFractionalBits: Returns the number of fractional bits in the mantissa of floating point type T.
floatExponentMin: Returns the minimum exponent that can represent
floatExponentMax: Returns the maximum exponent that can represent
floatTrueMin: Returns the smallest subnormal number representable in floating point type T.
floatMin: Returns the smallest normal number representable in floating point type T.
floatMax: Returns the largest normal number representable in floating point type T.
floatEps: Returns the machine epsilon of floating point type T.
floatEpsAt: Returns the local epsilon of floating point type T.
inf: Returns the inf value for a floating point `Type`.
nan: Returns the canonical quiet NaN representation for a floating point `Type`.
snan: Returns a signalling NaN representation for a floating point `Type`.

Source

Implementation

pub inline fn floatFractionalBits(comptime T: type) comptime_int {
    comptime assert(@typeInfo(T) == .float);

    // standard IEEE floats have an implicit 0.m or 1.m integer part
    // f80 is special and has an explicitly stored bit in the MSB
    // this function corresponds to `MANT_DIG - 1' from C
    return switch (@typeInfo(T).float.bits) {
        16 => 10,
        32 => 23,
        64 => 52,
        80 => 63,
        128 => 112,
        else => @compileError("unknown floating point type " ++ @typeName(T)),
    };
}