play/
play.rs

1// Copyright 2024 the Fearless_SIMD Authors
2// SPDX-License-Identifier: Apache-2.0 OR MIT
3
4#![expect(
5    missing_docs,
6    reason = "TODO: https://github.com/linebender/fearless_simd/issues/40"
7)]
8
9use fearless_simd::{Level, Simd, SimdBase, WithSimd, dispatch};
10
11// The WithSimd idea is adapted from pulp but is clunky; we
12// will probably prefer the `dispatch!` macro.
13struct Foo;
14
15impl WithSimd for Foo {
16    type Output = f32;
17
18    #[inline(always)]
19    fn with_simd<S: Simd>(self, simd: S) -> Self::Output {
20        let a = simd.splat_f32x4(42.0);
21        let b = a + a;
22        b[0]
23    }
24}
25
26#[inline(always)]
27fn foo<S: Simd>(simd: S, x: f32) -> f32 {
28    let n = S::f32s::N;
29    println!("n = {n}");
30    simd.splat_f32x4(x).sqrt()[0]
31}
32
33// currently requires `safe_wrappers` feature
34fn do_something_on_neon(_level: Level) -> f32 {
35    #[cfg(all(feature = "safe_wrappers", target_arch = "aarch64"))]
36    if let Some(neon) = _level.as_neon() {
37        return neon.vectorize(
38            #[inline(always)]
39            || {
40                let v = neon.neon.vdupq_n_f32(42.0);
41                neon.neon.vgetq_lane_f32::<0>(v)
42            },
43        );
44    }
45    0.0
46}
47
48fn main() {
49    let level = Level::new();
50    let x = level.dispatch(Foo);
51    let y = dispatch!(level, simd => foo(simd, 42.0));
52    let z = do_something_on_neon(level);
53
54    println!("level = {level:?}, x = {x}, y = {y}, z = {z}");
55}
play/play.rs

play/
play.rs
