| 1 | use super::copysignf; |
| 2 | use super::truncf; |
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| 3 | use core::f32; |
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| 4 | |
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| 5 | #[cfg_attr (all(test, assert_no_panic), no_panic::no_panic)] |
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| 6 | pub fn roundf(x: f32) -> f32 { |
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| 7 | truncf(x + copysignf(x:0.5 - 0.25 * f32::EPSILON, y:x)) |
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| 8 | } |
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| 9 | |
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| 10 | // PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520 |
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| 11 | #[cfg (not(target_arch = "powerpc64" ))] |
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| 12 | #[cfg (test)] |
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| 13 | mod tests { |
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| 14 | use super::roundf; |
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| 15 | |
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| 16 | #[test ] |
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| 17 | fn negative_zero() { |
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| 18 | assert_eq!(roundf(-0.0_f32).to_bits(), (-0.0_f32).to_bits()); |
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| 19 | } |
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| 20 | |
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| 21 | #[test ] |
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| 22 | fn sanity_check() { |
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| 23 | assert_eq!(roundf(-1.0), -1.0); |
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| 24 | assert_eq!(roundf(2.8), 3.0); |
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| 25 | assert_eq!(roundf(-0.5), -1.0); |
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| 26 | assert_eq!(roundf(0.5), 1.0); |
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| 27 | assert_eq!(roundf(-1.5), -2.0); |
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| 28 | assert_eq!(roundf(1.5), 2.0); |
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| 29 | } |
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| 30 | } |
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| 31 | |
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