1/// Absolute value (magnitude) (f16)
2///
3/// Calculates the absolute value (magnitude) of the argument `x`,
4/// by direct manipulation of the bit representation of `x`.
5#[cfg(f16_enabled)]
6#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
7pub fn fabsf16(x: f16) -> f16 {
8 super::generic::fabs(x)
9}
10
11/// Absolute value (magnitude) (f32)
12///
13/// Calculates the absolute value (magnitude) of the argument `x`,
14/// by direct manipulation of the bit representation of `x`.
15#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
16pub fn fabsf(x: f32) -> f32 {
17 select_implementation! {
18 name: fabsf,
19 use_arch: all(target_arch = "wasm32", intrinsics_enabled),
20 args: x,
21 }
22
23 super::generic::fabs(x)
24}
25
26/// Absolute value (magnitude) (f64)
27///
28/// Calculates the absolute value (magnitude) of the argument `x`,
29/// by direct manipulation of the bit representation of `x`.
30#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
31pub fn fabs(x: f64) -> f64 {
32 select_implementation! {
33 name: fabs,
34 use_arch: all(target_arch = "wasm32", intrinsics_enabled),
35 args: x,
36 }
37
38 super::generic::fabs(x)
39}
40
41/// Absolute value (magnitude) (f128)
42///
43/// Calculates the absolute value (magnitude) of the argument `x`,
44/// by direct manipulation of the bit representation of `x`.
45#[cfg(f128_enabled)]
46#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
47pub fn fabsf128(x: f128) -> f128 {
48 super::generic::fabs(x)
49}
50
51#[cfg(test)]
52mod tests {
53 use super::*;
54 use crate::support::Float;
55
56 /// Based on https://en.cppreference.com/w/cpp/numeric/math/fabs
57 fn spec_test<F: Float>(f: impl Fn(F) -> F) {
58 assert_biteq!(f(F::ZERO), F::ZERO);
59 assert_biteq!(f(F::NEG_ZERO), F::ZERO);
60 assert_biteq!(f(F::INFINITY), F::INFINITY);
61 assert_biteq!(f(F::NEG_INFINITY), F::INFINITY);
62 assert!(f(F::NAN).is_nan());
63
64 // Not spec rewquired but we expect it
65 assert!(f(F::NAN).is_sign_positive());
66 assert!(f(F::from_bits(F::NAN.to_bits() | F::SIGN_MASK)).is_sign_positive());
67 }
68
69 #[test]
70 #[cfg(f16_enabled)]
71 fn sanity_check_f16() {
72 assert_eq!(fabsf16(-1.0f16), 1.0);
73 assert_eq!(fabsf16(2.8f16), 2.8);
74 }
75
76 #[test]
77 #[cfg(f16_enabled)]
78 fn spec_tests_f16() {
79 spec_test::<f16>(fabsf16);
80 }
81
82 #[test]
83 fn sanity_check_f32() {
84 assert_eq!(fabsf(-1.0f32), 1.0);
85 assert_eq!(fabsf(2.8f32), 2.8);
86 }
87
88 #[test]
89 fn spec_tests_f32() {
90 spec_test::<f32>(fabsf);
91 }
92
93 #[test]
94 fn sanity_check_f64() {
95 assert_eq!(fabs(-1.0f64), 1.0);
96 assert_eq!(fabs(2.8f64), 2.8);
97 }
98
99 #[test]
100 fn spec_tests_f64() {
101 spec_test::<f64>(fabs);
102 }
103
104 #[test]
105 #[cfg(f128_enabled)]
106 fn sanity_check_f128() {
107 assert_eq!(fabsf128(-1.0f128), 1.0);
108 assert_eq!(fabsf128(2.8f128), 2.8);
109 }
110
111 #[test]
112 #[cfg(f128_enabled)]
113 fn spec_tests_f128() {
114 spec_test::<f128>(fabsf128);
115 }
116}
117

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