Remove stock function benchmarks. Moved to another repo

This commit is contained in:
Timothy Warren 2021-01-25 14:24:12 -05:00
parent b7f39a5cf7
commit 67d3e7780b
4 changed files with 0 additions and 1048 deletions

656
Cargo.lock generated
View File

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View File

@ -8,14 +8,7 @@ edition = "2018"
[dependencies]
[dev-dependencies]
criterion = "0.3"
[features]
default = ["std"]
alloc = []
std = ["alloc"]
[[bench]]
name = "stock_functions"
harness = false

View File

@ -1,110 +0,0 @@
use criterion::{criterion_group, criterion_main};
#[cfg(not(tarpaulin_include))]
mod sf {
use criterion::{black_box, BenchmarkId, Criterion};
use rusty_numbers::num::Unsigned;
use rusty_numbers::{factorial, fibonacci, it_factorial, mem_fibonacci, rec_fibonacci};
pub fn bench_factorial(c: &mut Criterion) {
let mut group = c.benchmark_group("Factorials");
for i in [0usize, 5, 10, 15, 20, 25, 30, 34].iter() {
group.bench_with_input(BenchmarkId::new("Recursive naive", i), i, |b, i| {
b.iter(|| factorial(black_box(*i)))
});
group.bench_with_input(BenchmarkId::new("Iterative", i), i, |b, i| {
b.iter(|| it_factorial(black_box(*i)))
});
}
group.finish();
}
pub fn bench_fibonacci(c: &mut Criterion) {
let mut group = c.benchmark_group("Fibonacci");
for i in [0usize, 10, 20, 30, 40, 50, 70, 93, 140, 186].iter() {
group.bench_with_input(BenchmarkId::new("Recursive memoized", i), i, |b, i| {
b.iter(|| mem_fibonacci(black_box(*i)))
});
group.bench_with_input(BenchmarkId::new("Iterative", i), i, |b, i| {
b.iter(|| fibonacci(black_box(*i)))
});
}
group.finish();
let mut group = c.benchmark_group("Recursive Fibonacci");
for i in [0usize, 10, 20, 25, 26, 27, 28, 29, 30].iter() {
group.bench_with_input(BenchmarkId::new("Naive Recursive", i), i, |b, i| {
b.iter(|| rec_fibonacci(black_box(*i)))
});
}
group.finish();
}
pub fn bench_gcd(c: &mut Criterion) {
let mut group = c.benchmark_group("GCD");
#[derive(Debug)]
struct Gcd {
left: u128,
right: u128,
left_fib: u128,
right_fib: u128,
}
impl Gcd {
fn new(left: u128, right: u128) -> Self {
Gcd {
left,
right,
left_fib: fibonacci(left as usize).unwrap(),
right_fib: fibonacci(right as usize).unwrap(),
}
}
}
let max = Gcd::new(185, 186);
let med = Gcd::new(92, 93);
let small = Gcd::new(14, 15);
for input in [small, med, max].iter() {
group.bench_with_input(
BenchmarkId::new("Binary", input.left),
input,
|bench, input| {
let a = input.left_fib;
let b = input.right_fib;
bench.iter(|| u128::gcd(black_box(a), black_box(b)))
},
);
group.bench_with_input(
BenchmarkId::new("Stein", input.left),
input,
|bench, input| {
let a = input.left_fib;
let b = input.right_fib;
bench.iter(|| u128::stein_gcd(black_box(a), black_box(b)))
},
);
group.bench_with_input(
BenchmarkId::new("Euclid", input.left),
input,
|bench, input| {
let a = input.left_fib;
let b = input.right_fib;
bench.iter(|| u128::e_gcd(black_box(a), black_box(b)))
},
);
}
group.finish();
}
}
criterion_group!(
benches,
sf::bench_factorial,
sf::bench_fibonacci,
sf::bench_gcd
);
criterion_main!(benches);

View File

@ -12,282 +12,7 @@ extern crate alloc;
#[macro_use]
extern crate std;
#[cfg(feature = "std")]
use core::f64::consts::{E, PI};
pub mod bigint;
pub mod num;
pub mod rational;
/// Calculate a number in the fibonacci sequence,
/// using recursion and a lookup table
///
/// Can calculate up to 186 using native unsigned 128 bit integers.
///
/// Example:
/// ```rust
/// use rusty_numbers::mem_fibonacci;
///
/// let valid = mem_fibonacci(45); // Some(1134903170)
/// # assert_eq!(1134903170, mem_fibonacci(45).unwrap());
/// # assert!(valid.is_some());
///
/// let invalid = mem_fibonacci(187); // None
/// # assert!(invalid.is_none());
/// ```
#[inline]
pub fn mem_fibonacci(n: usize) -> Option<u128> {
let mut table = [0u128; 187];
table[0] = 0;
table[1] = 1;
table[2] = 1;
/// Actual calculating function for `fibonacci`
fn f(n: usize, table: &mut [u128]) -> Option<u128> {
if n < 2 {
// The first values are predefined.
return Some(table[n]);
}
if n > 186 {
return None;
}
match table[n] {
// The lookup array starts out zeroed, so a zero
// is a not yet calculated value
0 => {
let a = f(n - 1, table)?;
let b = f(n - 2, table)?;
table[n] = a + b;
Some(table[n])
}
x => Some(x),
}
}
f(n, &mut table)
}
/// Calculate a number in the fibonacci sequence,
/// using naive recursion
///
/// REALLY SLOW
///
/// Can calculate up to 186 using native unsigned 128 bit integers.
#[inline]
pub fn rec_fibonacci(n: usize) -> Option<u128> {
if matches!(n, 0 | 1) {
Some(n as u128)
} else {
let a = rec_fibonacci(n - 1)?;
let b = rec_fibonacci(n - 2)?;
a.checked_add(b)
}
}
/// Calculate a number in the fibonacci sequence,
///
/// Can calculate up to 186 using native unsigned 128 bit integers.
///
/// Example:
/// ```rust
/// use rusty_numbers::fibonacci;
///
/// let valid = fibonacci(45); // Some(1134903170)
/// # assert_eq!(1134903170, fibonacci(45).unwrap());
/// # assert!(valid.is_some());
///
/// let invalid = fibonacci(187); // None
/// # assert!(invalid.is_none());
/// ```
#[inline]
pub fn fibonacci(n: usize) -> Option<u128> {
let mut a: u128 = 0;
let mut b: u128 = 1;
if matches!(n, 0 | 1) {
Some(n as u128)
} else {
for _ in 0..n - 1 {
let c: u128 = a.checked_add(b)?;
a = b;
b = c;
}
Some(b)
}
}
/// Calculate the value of a factorial iteratively
///
/// Can calculate up to 34! using native unsigned 128 bit integers.
///
/// Example:
/// ```rust
/// use rusty_numbers::factorial;
///
/// let valid = factorial(3); // Some(6)
/// # assert_eq!(6, valid.unwrap());
///
/// let invalid = factorial(35); // None
/// # assert!(invalid.is_none());
/// ```
#[inline]
pub fn it_factorial(n: usize) -> Option<u128> {
let mut total: u128 = 1;
if matches!(n, 0 | 1) {
Some(1u128)
} else {
for x in 1..=n {
total = total.checked_mul(x as u128)?;
}
Some(total)
}
}
/// Calculate the value of a factorial recrursively
///
/// Can calculate up to 34! using native unsigned 128 bit integers.
///
/// Example:
/// ```rust
/// use rusty_numbers::factorial;
///
/// let valid = factorial(3); // Some(6)
/// # assert_eq!(6, valid.unwrap());
///
/// let invalid = factorial(35); // None
/// # assert!(invalid.is_none());
/// ```
#[inline]
pub fn factorial(n: usize) -> Option<u128> {
if matches!(n, 0 | 1) {
Some(1u128)
} else {
let prev = factorial(n - 1)?;
(n as u128).checked_mul(prev)
}
}
/// Approximates a factorial using Stirling's approximation
///
/// Based on https://en.wikipedia.org/wiki/Stirling's_approximation
///
/// Can approximate up to ~ 170.624!
///
/// Example:
/// ```rust
/// use rusty_numbers::approx_factorial;
///
/// let valid = approx_factorial(170.6); // Some(..)
/// # assert!(valid.is_some());
///
/// let invalid = approx_factorial(171.0); // None
/// # assert!(invalid.is_none());
/// ```
#[cfg(feature = "std")]
#[inline]
pub fn approx_factorial(n: f64) -> Option<f64> {
let power = (n / E).powf(n);
let root = (PI * 2.0 * n).sqrt();
let res = power * root;
if res >= core::f64::MIN && res <= core::f64::MAX {
Some(res)
} else {
None
}
}
#[cfg(test)]
#[cfg(not(tarpaulin_include))]
mod tests {
use super::*;
#[test]
fn test_factorial() {
for pair in [[1usize, 0], [1, 1], [2, 2], [6, 3]].iter() {
assert_eq!(
Some(pair[0] as u128),
factorial(pair[1]),
"{}! should be {}",
pair[1],
pair[0]
);
assert_eq!(
Some(pair[0] as u128),
it_factorial(pair[1]),
"{}! should be {}",
pair[1],
pair[0]
);
}
// Verify each implementation returns the same results
let res = factorial(34);
let res2 = it_factorial(34);
assert!(res.is_some());
assert!(res2.is_some());
assert_eq!(res, res2);
// Bounds checks
assert!(factorial(35).is_none());
assert!(it_factorial(35).is_none());
}
#[cfg(feature = "std")]
#[test]
fn test_approx_factorial() {
assert!(approx_factorial(170.624).is_some());
assert!(approx_factorial(1.0).is_some());
assert!(approx_factorial(170.7).is_none());
}
#[test]
fn test_fibonacci() {
// Sanity checking
for pair in [[0usize, 0], [1, 1], [1, 2], [2, 3]].iter() {
assert_eq!(
Some(pair[0] as u128),
fibonacci(pair[1]),
"fibonacci({}) should be {}",
pair[1],
pair[0]
);
assert_eq!(
Some(pair[0] as u128),
mem_fibonacci(pair[1]),
"fibonacci({}) should be {}",
pair[1],
pair[0]
);
assert_eq!(
Some(pair[0] as u128),
rec_fibonacci(pair[1]),
"fibonacci({}) should be {}",
pair[1],
pair[0]
);
}
// Verify each implementation returns the same results
let res = fibonacci(186);
let res2 = mem_fibonacci(186);
assert!(res.is_some());
assert!(res2.is_some());
assert_eq!(res, res2);
// Bounds checks
assert!(fibonacci(187).is_none());
assert!(mem_fibonacci(187).is_none());
}
}