signedCbrtQ16()

i32 fl::anonymous_namespace{oklab_q16.cpp.hpp}::signedCbrtQ16

(

i32

raw

)

Signed cube root of an s16.16 raw value.

For a raw r standing for r/2^16, the root y satisfies (y/2^16)^3 = r/2^16, so y^3 = r * 2^32 – the integer cube root of the raw shifted left by 32. The magnitude is taken through i64 because negating INT32_MIN in 32 bits is undefined.

Definition at line 89 of file oklab_q16.cpp.hpp.

                                        {
    const i64 magnitude = raw < 0 ? -static_cast<i64>(raw) : static_cast<i64>(raw);
    const i32 root = static_cast<i32>(
        fl::icbrt64(static_cast<u64>(magnitude) << 32));
    return raw < 0 ? -root : root;
}

References fl::FL_NO_EXCEPT, fl::icbrt64(), and signedCbrtQ16().

Referenced by signedCbrtQ16().

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