roundf.rs - source
Description: Source of the Rust file `/Users/erlendbasso/.cargo/registry/src/github.com-1ecc6299db9ec823/libm-0.2.6/src/math/roundf.rs`.
Keywords: rust, rustlang, rust-lang

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    use super::copysignf;
    use super::truncf;
    use core::f32;

    #[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
    pub fn roundf(x: f32) -> f32 {
        truncf(x + copysignf(0.5 - 0.25 * f32::EPSILON, x))
    }

    // PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
    #[cfg(not(target_arch = "powerpc64"))]
    #[cfg(test)]
    mod tests {
        use super::roundf;

        #[test]
        fn negative_zero() {
            assert_eq!(roundf(-0.0_f32).to_bits(), (-0.0_f32).to_bits());
        }

        #[test]
        fn sanity_check() {
            assert_eq!(roundf(-1.0), -1.0);
            assert_eq!(roundf(2.8), 3.0);
            assert_eq!(roundf(-0.5), -1.0);
            assert_eq!(roundf(0.5), 1.0);
            assert_eq!(roundf(-1.5), -2.0);
            assert_eq!(roundf(1.5), 2.0);
        }
    }