| 1 | /// Absolute value (magnitude) (f64) |
| 2 | /// |
|---|
| 3 | /// Calculates the absolute value (magnitude) of the argument `x`, |
|---|
| 4 | /// by direct manipulation of the bit representation of `x`. |
|---|
| 5 | #[cfg_attr (all(test, assert_no_panic), no_panic::no_panic)] |
|---|
| 6 | pub fn fabs(x: f64) -> f64 { |
|---|
| 7 | select_implementation! { |
|---|
| 8 | name: fabs, |
|---|
| 9 | use_arch: all(target_arch = "wasm32" , intrinsics_enabled), |
|---|
| 10 | args: x, |
|---|
| 11 | } |
|---|
| 12 | |
|---|
| 13 | super::generic::fabs(x) |
|---|
| 14 | } |
|---|
| 15 | |
|---|
| 16 | #[cfg (test)] |
|---|
| 17 | mod tests { |
|---|
| 18 | use super::*; |
|---|
| 19 | |
|---|
| 20 | #[test ] |
|---|
| 21 | fn sanity_check() { |
|---|
| 22 | assert_eq!(fabs(-1.0), 1.0); |
|---|
| 23 | assert_eq!(fabs(2.8), 2.8); |
|---|
| 24 | } |
|---|
| 25 | |
|---|
| 26 | /// The spec: https://en.cppreference.com/w/cpp/numeric/math/fabs |
|---|
| 27 | #[test ] |
|---|
| 28 | fn spec_tests() { |
|---|
| 29 | assert!(fabs(f64::NAN).is_nan()); |
|---|
| 30 | for f in [0.0, -0.0].iter().copied() { |
|---|
| 31 | assert_eq!(fabs(f), 0.0); |
|---|
| 32 | } |
|---|
| 33 | for f in [f64::INFINITY, f64::NEG_INFINITY].iter().copied() { |
|---|
| 34 | assert_eq!(fabs(f), f64::INFINITY); |
|---|
| 35 | } |
|---|
| 36 | } |
|---|
| 37 | } |
|---|
| 38 | |
|---|
