moxcms/math/
floor.rs

1/*
2 * // Copyright (c) Radzivon Bartoshyk 4/2025. All rights reserved.
3 * //
4 * // Redistribution and use in source and binary forms, with or without modification,
5 * // are permitted provided that the following conditions are met:
6 * //
7 * // 1.  Redistributions of source code must retain the above copyright notice, this
8 * // list of conditions and the following disclaimer.
9 * //
10 * // 2.  Redistributions in binary form must reproduce the above copyright notice,
11 * // this list of conditions and the following disclaimer in the documentation
12 * // and/or other materials provided with the distribution.
13 * //
14 * // 3.  Neither the name of the copyright holder nor the names of its
15 * // contributors may be used to endorse or promote products derived from
16 * // this software without specific prior written permission.
17 * //
18 * // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22 * // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25 * // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29use crate::math::common::copysignk;
30use crate::math::copysignfk;
31
32/// Round to integer towards minus infinity
33#[inline]
34pub const fn floorf(x: f32) -> f32 {
35    const F1_23: f32 = (1u32 << 23) as f32;
36    let mut fr = x - (x as i32 as f32);
37    fr = if fr < 0. { fr + 1. } else { fr };
38    if x.is_infinite() || (x.abs() >= F1_23) {
39        x
40    } else {
41        copysignfk(x - fr, x)
42    }
43}
44
45/// Floors value
46#[inline]
47pub const fn floor(x: f64) -> f64 {
48    const D1_31: f64 = (1u64 << 31) as f64;
49    const D1_52: f64 = (1u64 << 52) as f64;
50    let mut fr = x - D1_31 * ((x * (1. / D1_31)) as i32 as f64);
51    fr -= fr as i32 as f64;
52    fr = if fr < 0. { fr + 1. } else { fr };
53    if x.is_infinite() || (x.abs() >= D1_52) {
54        x
55    } else {
56        copysignk(x - fr, x)
57    }
58}
moxcms/math/floor.rs

moxcms/math/
floor.rs
