1use base2k::ffi::reim::*;
 2use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
 3use std::ffi::c_void;
 4
 5fn fft(c: &mut Criterion) {
 6    fn forward<'a>(
 7        m: u32,
 8        log_bound: u32,
 9        reim_fft_precomp: *mut reim_fft_precomp,
10        a: &'a [i64],
11    ) -> Box<dyn FnMut() + 'a> {
12        unsafe {
13            let buf_a: *mut f64 = reim_fft_precomp_get_buffer(reim_fft_precomp, 0);
14            reim_from_znx64_simple(m as u32, log_bound as u32, buf_a as *mut c_void, a.as_ptr());
15            Box::new(move || reim_fft(reim_fft_precomp, buf_a))
16        }
17    }
18
19    fn backward<'a>(
20        m: u32,
21        log_bound: u32,
22        reim_ifft_precomp: *mut reim_ifft_precomp,
23        a: &'a [i64],
24    ) -> Box<dyn FnMut() + 'a> {
25        Box::new(move || unsafe {
26            let buf_a: *mut f64 = reim_ifft_precomp_get_buffer(reim_ifft_precomp, 0);
27            reim_from_znx64_simple(m as u32, log_bound as u32, buf_a as *mut c_void, a.as_ptr());
28            reim_ifft(reim_ifft_precomp, buf_a);
29        })
30    }
31
32    let mut b: criterion::BenchmarkGroup<'_, criterion::measurement::WallTime> =
33        c.benchmark_group("fft");
34
35    for log_n in 10..17 {
36        let n: usize = 1 << log_n;
37        let m: usize = n >> 1;
38        let log_bound: u32 = 19;
39
40        let mut a: Vec<i64> = vec![i64::default(); n];
41        a.iter_mut().enumerate().for_each(|(i, x)| *x = i as i64);
42
43        unsafe {
44            let reim_fft_precomp: *mut reim_fft_precomp = new_reim_fft_precomp(m as u32, 1);
45            let reim_ifft_precomp: *mut reim_ifft_precomp = new_reim_ifft_precomp(m as u32, 1);
46
47            let runners: [(String, Box<dyn FnMut()>); 2] = [
48                (format!("forward"), {
49                    forward(m as u32, log_bound, reim_fft_precomp, &a)
50                }),
51                (format!("backward"), {
52                    backward(m as u32, log_bound, reim_ifft_precomp, &a)
53                }),
54            ];
55
56            for (name, mut runner) in runners {
57                let id: BenchmarkId = BenchmarkId::new(name, format!("n={}", 1 << log_n));
58                b.bench_with_input(id, &(), |b: &mut criterion::Bencher<'_>, _| {
59                    b.iter(&mut runner)
60                });
61            }
62        }
63    }
64}
65
66criterion_group!(benches, fft,);
67criterion_main!(benches);