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Diffstat (limited to 'third_party/rust/minimal-lexical/tests/libm_tests.rs')
-rw-r--r-- | third_party/rust/minimal-lexical/tests/libm_tests.rs | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/third_party/rust/minimal-lexical/tests/libm_tests.rs b/third_party/rust/minimal-lexical/tests/libm_tests.rs new file mode 100644 index 0000000000..7f5352e193 --- /dev/null +++ b/third_party/rust/minimal-lexical/tests/libm_tests.rs @@ -0,0 +1,289 @@ +#![cfg(all(not(feature = "std"), feature = "compact"))] + +// These are adapted from libm, a port of musl libc's libm to Rust. +// libm can be found online [here](https://github.com/rust-lang/libm), +// and is similarly licensed under an Apache2.0/MIT license + +use core::f64; +use minimal_lexical::libm; + +#[test] +fn fabsf_sanity_test() { + assert_eq!(libm::fabsf(-1.0), 1.0); + assert_eq!(libm::fabsf(2.8), 2.8); +} + +/// The spec: https://en.cppreference.com/w/cpp/numeric/math/fabs +#[test] +fn fabsf_spec_test() { + assert!(libm::fabsf(f32::NAN).is_nan()); + for f in [0.0, -0.0].iter().copied() { + assert_eq!(libm::fabsf(f), 0.0); + } + for f in [f32::INFINITY, f32::NEG_INFINITY].iter().copied() { + assert_eq!(libm::fabsf(f), f32::INFINITY); + } +} + +#[test] +fn sqrtf_sanity_test() { + assert_eq!(libm::sqrtf(100.0), 10.0); + assert_eq!(libm::sqrtf(4.0), 2.0); +} + +/// The spec: https://en.cppreference.com/w/cpp/numeric/math/sqrt +#[test] +fn sqrtf_spec_test() { + // Not Asserted: FE_INVALID exception is raised if argument is negative. + assert!(libm::sqrtf(-1.0).is_nan()); + assert!(libm::sqrtf(f32::NAN).is_nan()); + for f in [0.0, -0.0, f32::INFINITY].iter().copied() { + assert_eq!(libm::sqrtf(f), f); + } +} + +const POS_ZERO: &[f64] = &[0.0]; +const NEG_ZERO: &[f64] = &[-0.0]; +const POS_ONE: &[f64] = &[1.0]; +const NEG_ONE: &[f64] = &[-1.0]; +const POS_FLOATS: &[f64] = &[99.0 / 70.0, f64::consts::E, f64::consts::PI]; +const NEG_FLOATS: &[f64] = &[-99.0 / 70.0, -f64::consts::E, -f64::consts::PI]; +const POS_SMALL_FLOATS: &[f64] = &[(1.0 / 2.0), f64::MIN_POSITIVE, f64::EPSILON]; +const NEG_SMALL_FLOATS: &[f64] = &[-(1.0 / 2.0), -f64::MIN_POSITIVE, -f64::EPSILON]; +const POS_EVENS: &[f64] = &[2.0, 6.0, 8.0, 10.0, 22.0, 100.0, f64::MAX]; +const NEG_EVENS: &[f64] = &[f64::MIN, -100.0, -22.0, -10.0, -8.0, -6.0, -2.0]; +const POS_ODDS: &[f64] = &[3.0, 7.0]; +const NEG_ODDS: &[f64] = &[-7.0, -3.0]; +const NANS: &[f64] = &[f64::NAN]; +const POS_INF: &[f64] = &[f64::INFINITY]; +const NEG_INF: &[f64] = &[f64::NEG_INFINITY]; + +const ALL: &[&[f64]] = &[ + POS_ZERO, + NEG_ZERO, + NANS, + NEG_SMALL_FLOATS, + POS_SMALL_FLOATS, + NEG_FLOATS, + POS_FLOATS, + NEG_EVENS, + POS_EVENS, + NEG_ODDS, + POS_ODDS, + NEG_INF, + POS_INF, + NEG_ONE, + POS_ONE, +]; +const POS: &[&[f64]] = &[POS_ZERO, POS_ODDS, POS_ONE, POS_FLOATS, POS_EVENS, POS_INF]; +const NEG: &[&[f64]] = &[NEG_ZERO, NEG_ODDS, NEG_ONE, NEG_FLOATS, NEG_EVENS, NEG_INF]; + +fn powd(base: f64, exponent: f64, expected: f64) { + let res = libm::powd(base, exponent); + assert!( + if expected.is_nan() { + res.is_nan() + } else { + libm::powd(base, exponent) == expected + }, + "{} ** {} was {} instead of {}", + base, + exponent, + res, + expected + ); +} + +fn powd_test_sets_as_base(sets: &[&[f64]], exponent: f64, expected: f64) { + sets.iter().for_each(|s| s.iter().for_each(|val| powd(*val, exponent, expected))); +} + +fn powd_test_sets_as_exponent(base: f64, sets: &[&[f64]], expected: f64) { + sets.iter().for_each(|s| s.iter().for_each(|val| powd(base, *val, expected))); +} + +fn powd_test_sets(sets: &[&[f64]], computed: &dyn Fn(f64) -> f64, expected: &dyn Fn(f64) -> f64) { + sets.iter().for_each(|s| { + s.iter().for_each(|val| { + let exp = expected(*val); + let res = computed(*val); + + assert!( + if exp.is_nan() { + res.is_nan() + } else { + exp == res + }, + "test for {} was {} instead of {}", + val, + res, + exp + ); + }) + }); +} + +#[test] +fn powd_zero_as_exponent() { + powd_test_sets_as_base(ALL, 0.0, 1.0); + powd_test_sets_as_base(ALL, -0.0, 1.0); +} + +#[test] +fn powd_one_as_base() { + powd_test_sets_as_exponent(1.0, ALL, 1.0); +} + +#[test] +fn powd_nan_inputs() { + // NAN as the base: + // (NAN ^ anything *but 0* should be NAN) + powd_test_sets_as_exponent(f64::NAN, &ALL[2..], f64::NAN); + + // NAN as the exponent: + // (anything *but 1* ^ NAN should be NAN) + powd_test_sets_as_base(&ALL[..(ALL.len() - 2)], f64::NAN, f64::NAN); +} + +#[test] +fn powd_infinity_as_base() { + // Positive Infinity as the base: + // (+Infinity ^ positive anything but 0 and NAN should be +Infinity) + powd_test_sets_as_exponent(f64::INFINITY, &POS[1..], f64::INFINITY); + + // (+Infinity ^ negative anything except 0 and NAN should be 0.0) + powd_test_sets_as_exponent(f64::INFINITY, &NEG[1..], 0.0); + + // Negative Infinity as the base: + // (-Infinity ^ positive odd ints should be -Infinity) + powd_test_sets_as_exponent(f64::NEG_INFINITY, &[POS_ODDS], f64::NEG_INFINITY); + + // (-Infinity ^ anything but odd ints should be == -0 ^ (-anything)) + // We can lump in pos/neg odd ints here because they don't seem to + // cause panics (div by zero) in release mode (I think). + powd_test_sets(ALL, &|v: f64| libm::powd(f64::NEG_INFINITY, v), &|v: f64| libm::powd(-0.0, -v)); +} + +#[test] +fn infinity_as_exponent() { + // Positive/Negative base greater than 1: + // (pos/neg > 1 ^ Infinity should be Infinity - note this excludes NAN as the base) + powd_test_sets_as_base(&ALL[5..(ALL.len() - 2)], f64::INFINITY, f64::INFINITY); + + // (pos/neg > 1 ^ -Infinity should be 0.0) + powd_test_sets_as_base(&ALL[5..ALL.len() - 2], f64::NEG_INFINITY, 0.0); + + // Positive/Negative base less than 1: + let base_below_one = &[POS_ZERO, NEG_ZERO, NEG_SMALL_FLOATS, POS_SMALL_FLOATS]; + + // (pos/neg < 1 ^ Infinity should be 0.0 - this also excludes NAN as the base) + powd_test_sets_as_base(base_below_one, f64::INFINITY, 0.0); + + // (pos/neg < 1 ^ -Infinity should be Infinity) + powd_test_sets_as_base(base_below_one, f64::NEG_INFINITY, f64::INFINITY); + + // Positive/Negative 1 as the base: + // (pos/neg 1 ^ Infinity should be 1) + powd_test_sets_as_base(&[NEG_ONE, POS_ONE], f64::INFINITY, 1.0); + + // (pos/neg 1 ^ -Infinity should be 1) + powd_test_sets_as_base(&[NEG_ONE, POS_ONE], f64::NEG_INFINITY, 1.0); +} + +#[test] +fn powd_zero_as_base() { + // Positive Zero as the base: + // (+0 ^ anything positive but 0 and NAN should be +0) + powd_test_sets_as_exponent(0.0, &POS[1..], 0.0); + + // (+0 ^ anything negative but 0 and NAN should be Infinity) + // (this should panic because we're dividing by zero) + powd_test_sets_as_exponent(0.0, &NEG[1..], f64::INFINITY); + + // Negative Zero as the base: + // (-0 ^ anything positive but 0, NAN, and odd ints should be +0) + powd_test_sets_as_exponent(-0.0, &POS[3..], 0.0); + + // (-0 ^ anything negative but 0, NAN, and odd ints should be Infinity) + // (should panic because of divide by zero) + powd_test_sets_as_exponent(-0.0, &NEG[3..], f64::INFINITY); + + // (-0 ^ positive odd ints should be -0) + powd_test_sets_as_exponent(-0.0, &[POS_ODDS], -0.0); + + // (-0 ^ negative odd ints should be -Infinity) + // (should panic because of divide by zero) + powd_test_sets_as_exponent(-0.0, &[NEG_ODDS], f64::NEG_INFINITY); +} + +#[test] +fn special_cases() { + // One as the exponent: + // (anything ^ 1 should be anything - i.e. the base) + powd_test_sets(ALL, &|v: f64| libm::powd(v, 1.0), &|v: f64| v); + + // Negative One as the exponent: + // (anything ^ -1 should be 1/anything) + powd_test_sets(ALL, &|v: f64| libm::powd(v, -1.0), &|v: f64| 1.0 / v); + + // Factoring -1 out: + // (negative anything ^ integer should be (-1 ^ integer) * (positive anything ^ integer)) + [POS_ZERO, NEG_ZERO, POS_ONE, NEG_ONE, POS_EVENS, NEG_EVENS].iter().for_each(|int_set| { + int_set.iter().for_each(|int| { + powd_test_sets(ALL, &|v: f64| libm::powd(-v, *int), &|v: f64| { + libm::powd(-1.0, *int) * libm::powd(v, *int) + }); + }) + }); + + // Negative base (imaginary results): + // (-anything except 0 and Infinity ^ non-integer should be NAN) + NEG[1..(NEG.len() - 1)].iter().for_each(|set| { + set.iter().for_each(|val| { + powd_test_sets(&ALL[3..7], &|v: f64| libm::powd(*val, v), &|_| f64::NAN); + }) + }); +} + +#[test] +fn normal_cases() { + assert_eq!(libm::powd(2.0, 20.0), (1 << 20) as f64); + assert_eq!(libm::powd(-1.0, 9.0), -1.0); + assert!(libm::powd(-1.0, 2.2).is_nan()); + assert!(libm::powd(-1.0, -1.14).is_nan()); +} + +#[test] +fn fabsd_sanity_test() { + assert_eq!(libm::fabsd(-1.0), 1.0); + assert_eq!(libm::fabsd(2.8), 2.8); +} + +/// The spec: https://en.cppreference.com/w/cpp/numeric/math/fabs +#[test] +fn fabsd_spec_test() { + assert!(libm::fabsd(f64::NAN).is_nan()); + for f in [0.0, -0.0].iter().copied() { + assert_eq!(libm::fabsd(f), 0.0); + } + for f in [f64::INFINITY, f64::NEG_INFINITY].iter().copied() { + assert_eq!(libm::fabsd(f), f64::INFINITY); + } +} + +#[test] +fn sqrtd_sanity_test() { + assert_eq!(libm::sqrtd(100.0), 10.0); + assert_eq!(libm::sqrtd(4.0), 2.0); +} + +/// The spec: https://en.cppreference.com/w/cpp/numeric/math/sqrt +#[test] +fn sqrtd_spec_test() { + // Not Asserted: FE_INVALID exception is raised if argument is negative. + assert!(libm::sqrtd(-1.0).is_nan()); + assert!(libm::sqrtd(f64::NAN).is_nan()); + for f in [0.0, -0.0, f64::INFINITY].iter().copied() { + assert_eq!(libm::sqrtd(f), f); + } +} |