fast_logf_approx()

float fl::fast_logf_approx ( float x )

inline

Definition at line 414 of file math.h.

                                                    {
    union { float f; u32 i; } u;
    u.f = x;
    i32 e = static_cast<i32>(u.i >> 23) - 127;
    u.i = (u.i & 0x007FFFFFu) | 0x3F800000u;
    float m = u.f;
    float t = m - 1.0f;
    float log2m = t * (1.3327635f + t * (-0.3327635f));
    return (static_cast<float>(e) + log2m) * 0.6931471805599453f;
}

References FL_NO_EXCEPT, t, and x.

Referenced by fl::audio::detector::Vocal::computeBroadSpectralFeatures().

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