pic_scale/math/
consts.rs

1/*
2 * Copyright (c) Radzivon Bartoshyk. 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 num_traits::MulAdd;
30use std::ops::{Add, Mul};
31
32pub trait ConstSqrt2 {
33    fn const_sqrt2() -> Self;
34}
35
36impl ConstSqrt2 for f32 {
37    #[inline]
38    fn const_sqrt2() -> Self {
39        std::f32::consts::SQRT_2
40    }
41}
42
43impl ConstSqrt2 for f64 {
44    #[inline]
45    fn const_sqrt2() -> Self {
46        std::f64::consts::SQRT_2
47    }
48}
49
50pub trait ConstPI {
51    fn const_pi() -> Self;
52}
53
54impl ConstPI for f32 {
55    #[inline]
56    fn const_pi() -> Self {
57        std::f32::consts::PI
58    }
59}
60
61impl ConstPI for f64 {
62    #[inline]
63    fn const_pi() -> Self {
64        std::f64::consts::PI
65    }
66}
67
68#[cfg(any(
69    all(
70        any(target_arch = "x86", target_arch = "x86_64"),
71        target_feature = "fma"
72    ),
73    all(target_arch = "aarch64", target_feature = "neon")
74))]
75#[inline(always)]
76pub(crate) fn mla<T: Copy + Mul<T, Output = T> + Add<T, Output = T> + MulAdd<T, Output = T>>(
77    a: T,
78    b: T,
79    acc: T,
80) -> T {
81    MulAdd::mul_add(a, b, acc)
82}
83
84#[inline(always)]
85#[cfg(not(any(
86    all(
87        any(target_arch = "x86", target_arch = "x86_64"),
88        target_feature = "fma"
89    ),
90    all(target_arch = "aarch64", target_feature = "neon")
91)))]
92pub(crate) fn mla<T: Copy + Mul<T, Output = T> + Add<T, Output = T> + MulAdd<T, Output = T>>(
93    a: T,
94    b: T,
95    acc: T,
96) -> T {
97    a * b + acc
98}
pic_scale/math/consts.rs

pic_scale/math/
consts.rs
