56 lines
1.6 KiB
Rust
56 lines
1.6 KiB
Rust
use std::iter::zip;
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// is n about the same as m?
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// This is actually not so easy! How do you measure "about same"ness?
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// Also, it is not transitive, as 1 ≈ 1.1 ≈ 1.2 ≈ 1.3 ≈ ... ≈ 2 ≈ ... ≈ 3 ≈ ... ≈ infinity, that's
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// a thought of me at least?
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#[inline]
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fn about_same(n: f32, m: f32) -> bool {
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// dbg!((n, m));
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// dbg!((n - m).abs());
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// dbg!(calc_gate(n, m));
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// dbg!((n - m).abs() < calc_gate(n, m));
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(n - m).abs() <= calc_gate(n, m)
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}
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#[inline]
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fn calc_gate(n: f32, m: f32) -> f32 {
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0.01 + ((n.abs().sqrt().min(m.abs().sqrt())).abs() / 10f32)
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}
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#[test]
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fn test_calc_fast_rsqrt() {
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assert_ne!(0.0, revsqrt::fast_inverse_sqrt(rand::random()))
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}
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#[test]
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fn test_calc_regular_rsqrt() {
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assert_ne!(0.0, revsqrt::regular_inverse_sqrt(rand::random()))
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}
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#[test]
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fn test_calc_specific_fast_rsqrt() {
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let params: &[f32] = &[1.0, 1.1, 100.0, 1337.0, 123.456_79, 1337.1337];
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let results: &[f32] = &[1.0, 0.953_462_6, 0.1, 0.027_348_55, 0.09, 0.027_347_183];
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for (n, m) in zip(params, results) {
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assert!(about_same(revsqrt::fast_inverse_sqrt(*n), *m))
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}
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}
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#[test]
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fn test_calc_specific_reqular_rsqrt() {
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let params: &[f32] = &[1.0, 1.1, 100.0, 1337.0, 123.456_79, 1337.1337];
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let results: &[f32] = &[1.0, 0.953_462_6, 0.1, 0.027_348_55, 0.09, 0.027_347_183];
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for (n, m) in zip(params, results) {
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assert_eq!(revsqrt::regular_inverse_sqrt(*n), *m)
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}
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}
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#[allow(clippy::assertions_on_constants)]
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#[test]
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#[ignore] // this test confuses the CI
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fn test_fail() {
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println!("the stdout will be printed on fail!");
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assert!(false)
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}
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