1/// Absolute value (magnitude) (f32)
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)]
6pub fn fabsf(x: f32) -> f32 {
7 select_implementation! {
8 name: fabsf,
9 use_arch: all(target_arch = "wasm32", intrinsics_enabled),
10 args: x,
11 }
12
13 super::generic::fabs(x)
14}
15
16// PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
17#[cfg(not(target_arch = "powerpc64"))]
18#[cfg(test)]
19mod tests {
20 use super::*;
21
22 #[test]
23 fn sanity_check() {
24 assert_eq!(fabsf(-1.0), 1.0);
25 assert_eq!(fabsf(2.8), 2.8);
26 }
27
28 /// The spec: https://en.cppreference.com/w/cpp/numeric/math/fabs
29 #[test]
30 fn spec_tests() {
31 assert!(fabsf(f32::NAN).is_nan());
32 for f in [0.0, -0.0].iter().copied() {
33 assert_eq!(fabsf(f), 0.0);
34 }
35 for f in [f32::INFINITY, f32::NEG_INFINITY].iter().copied() {
36 assert_eq!(fabsf(f), f32::INFINITY);
37 }
38 }
39}
40