prev-float ( m -- n )
Factor handbook » The language » Numbers » Floats » Bitwise operations on floats

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Vocabulary
math

Inputs

m

a float

Outputs

n

a float

Word description
Returns the greatest representable float value less than m, or in the case of +0.0, returns -0.0.

See also
next-float

Definition

IN: math

GENERIC: prev-float ( m -- n )

Methods

USING: kernel math ;

M: float prev-float
    double>bits dup -0.0 double>bits >=
    [ 1 + bits>double ] [
        dup 0.0 double>bits =
        [ drop -0.0 ] [ 1 - bits>double ] if
    ] if ; inline