/rust/registry/src/index.crates.io-6f17d22bba15001f/libm-0.2.11/src/math/ceilf.rs

Source (jump to first uncovered line)
use core::f32;

/// Ceil (f32)
///
/// Finds the nearest integer greater than or equal to `x`.
#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
pub fn ceilf(x: f32) -> f32 {
    // On wasm32 we know that LLVM's intrinsic will compile to an optimized
    // `f32.ceil` native instruction, so we can leverage this for both code size
    // and speed.
    llvm_intrinsically_optimized! {
        #[cfg(target_arch = "wasm32")] {
            return unsafe { ::core::intrinsics::ceilf32(x) }
        }
    }
    let mut ui = x.to_bits();
    let e = (((ui >> 23) & 0xff).wrapping_sub(0x7f)) as i32;

    if e >= 23 {
        return x;
    }
    if e >= 0 {
        let m = 0x007fffff >> e;
        if (ui & m) == 0 {
            return x;
        }
        force_eval!(x + f32::from_bits(0x7b800000));
        if ui >> 31 == 0 {
            ui += m;
        }
        ui &= !m;
    } else {
        force_eval!(x + f32::from_bits(0x7b800000));
        if ui >> 31 != 0 {
            return -0.0;
        } else if ui << 1 != 0 {
            return 1.0;
        }
    }
    f32::from_bits(ui)
}

// 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 core::f32::*;

    use super::*;

    #[test]
    fn sanity_check() {
        assert_eq!(ceilf(1.1), 2.0);
        assert_eq!(ceilf(2.9), 3.0);
    }

    /// The spec: https://en.cppreference.com/w/cpp/numeric/math/ceil
    #[test]
    fn spec_tests() {
        // Not Asserted: that the current rounding mode has no effect.
        assert!(ceilf(NAN).is_nan());
        for f in [0.0, -0.0, INFINITY, NEG_INFINITY].iter().copied() {
            assert_eq!(ceilf(f), f);
        }
    }
}

Coverage Report

Created: 2025-08-29 06:18

Line	Count	Source (jump to first uncovered line)
1		use core::f32;
2
3		/// Ceil (f32)
4		///
5		/// Finds the nearest integer greater than or equal to `x`.
6		#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
7	0	pub fn ceilf(x: f32) -> f32 {
8	0	// On wasm32 we know that LLVM's intrinsic will compile to an optimized
9	0	// `f32.ceil` native instruction, so we can leverage this for both code size
10	0	// and speed.
11	0	llvm_intrinsically_optimized! {
12	0	#[cfg(target_arch = "wasm32")] {
13	0	return unsafe { ::core::intrinsics::ceilf32(x) }
14	0	}
15	0	}
16	0	let mut ui = x.to_bits();
17	0	let e = (((ui >> 23) & 0xff).wrapping_sub(0x7f)) as i32;
18	0
19	0	if e >= 23 {
20	0	return x;
21	0	}
22	0	if e >= 0 {
23	0	let m = 0x007fffff >> e;
24	0	if (ui & m) == 0 {
25	0	return x;
26	0	}
27	0	force_eval!(x + f32::from_bits(0x7b800000));
28	0	if ui >> 31 == 0 {
29	0	ui += m;
30	0	}
31	0	ui &= !m;
32		} else {
33	0	force_eval!(x + f32::from_bits(0x7b800000));
34	0	if ui >> 31 != 0 {
35	0	return -0.0;
36	0	} else if ui << 1 != 0 {
37	0	return 1.0;
38	0	}
39		}
40	0	f32::from_bits(ui)
41	0	}
42
43		// PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
44		#[cfg(not(target_arch = "powerpc64"))]
45		#[cfg(test)]
46		mod tests {
47		use core::f32::*;
48
49		use super::*;
50
51		#[test]
52		fn sanity_check() {
53		assert_eq!(ceilf(1.1), 2.0);
54		assert_eq!(ceilf(2.9), 3.0);
55		}
56
57		/// The spec: https://en.cppreference.com/w/cpp/numeric/math/ceil
58		#[test]
59		fn spec_tests() {
60		// Not Asserted: that the current rounding mode has no effect.
61		assert!(ceilf(NAN).is_nan());
62		for f in [0.0, -0.0, INFINITY, NEG_INFINITY].iter().copied() {
63		assert_eq!(ceilf(f), f);
64		}
65		}
66		}