Function fast_math::log2

pub fn log2(x: f32) -> f32

Compute a fast approximation of the base-2 logarithm of x.

The maximum relative error across all positive f32s (including denormals) is less than 0.022. The maximum absolute error is less than 0.009.

If x is negative, or NaN, log2 returns NaN.

See also log2_raw which only works on positive, finite, non-denormal floats, but is 30-40% faster.

	Time (ns)
x.log2()	14.3
log2(x)	4.0
log2_raw(x)	2.7