reconstructFloat

Creates floating point type T from an unbiased exponent and raw mantissa.

Function parameters

Parameters

T:type
exponent:comptime_int
mantissa:comptime_int

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

inline fn reconstructFloat(comptime T: type, comptime exponent: comptime_int, comptime mantissa: comptime_int) T {
    const TBits = @Type(.{ .int = .{ .signedness = .unsigned, .bits = @bitSizeOf(T) } });
    const biased_exponent = @as(TBits, exponent + floatExponentMax(T));
    return @as(T, @bitCast((biased_exponent << floatMantissaBits(T)) | @as(TBits, mantissa)));
}