Crate fast_math

Fast, approximate versions of mathematical functions.

This crate includes implementations of “expensive” mathematical functions that are much faster, at the expense of some accuracy. All functions have good guarantees on accuracy to some degree (both relative and absolute).

Installation

Add this to your Cargo.toml

[dependencies]
fast-math = "0.1"

Examples

let x = 10.4781;
let approx = fast_math::log2(x);
let real = x.log2();
// they should be close
assert!((approx - real).abs() < 0.01);

Functions

• atan
  Compute a fast approximation of the arctangent of x.
• atan2
  Compute a fast approximation of the four quadrant arctangent of y and x.
• atan_raw
  Compute a fast approximation of the inverse tangent for |x| < 1.
• exp
  Compute a fast approximation to e^x.
• exp2
  Compute a fast approximation to 2^x.
• exp2_raw
  Compute a fast approximation to 2^x for -151 ≤ x ≤ 151.
• exp_raw
  Compute a fast approximation to e^x for -104 ≤ x ≤ 104.
• log2
  Compute a fast approximation of the base-2 logarithm of x.
• log2_raw
  Compute a fast approximation of the base-2 logarithm of positive, finite, non-denormal x.