Dev checkpoint - testing lookup tables

benches/devbench.rs

@@ -0,0 +1,46 @@
+#![allow(dead_code, unused_imports)]
+
+extern crate fastmath;
+
+use fastmath::*;
+use criterion::{Criterion, BenchmarkGroup, measurement::WallTime};
+use criterion::{black_box, criterion_group, criterion_main};
+use std::f32::consts as f32_consts;
+use std::f64::consts as f64_consts;
+
+pub mod exact {
+    include!("../src/tests/accuracy/exact.rs");
+}
+include!("../src/tests/accuracy/x.rs");
+
+fn dev_cos(x: f64) -> f64 {
+    const ONE: f64 = 1.0;
+    let v = ((((x + f64_consts::PI).abs()) % f64_consts::TAU) - f64_consts::PI).abs();
+    let qpprox = ONE - f64_consts::FRAC_2_PI * v;
+    qpprox + f64_consts::FRAC_PI_6 * qpprox * (ONE - qpprox * qpprox)
+}
+
+fn devbench(group: &mut BenchmarkGroup<WallTime>) {
+    group.bench_function("dev_cos", |b| {
+        b.iter(|| X_F64.iter().map(|&x| dev_cos(black_box(x))).collect::<Vec<f64>>())
+    });
+    group.bench_function("fast_cos", |b| {
+        b.iter(|| X_F64.iter().map(|&x| black_box(x).fast_cos()).collect::<Vec<f64>>())
+    });
+    group.bench_function("lookup_cos", |b| {
+        b.iter(|| X_F64.iter().map(|&x| black_box(x).lookup_cos()).collect::<Vec<f64>>())
+    });
+    group.bench_function("builtin_cos", |b| {
+        b.iter(|| X_F64.iter().map(|&x| exact::f64::cos(black_box(x))).collect::<Vec<f64>>())
+    });
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    // Then, tests can begin
+    let mut group = c.benchmark_group("devbench");
+    devbench(&mut group);
+    group.finish();
+}
+
+criterion_group!(devbenches, criterion_benchmark);
+criterion_main!(devbenches);