Add slice swap benchmark.
Adds a benchmark of various different ways of swapping the elements of
two slices, including several implementations in C.
Change-Id: I7ff490aefee6edfe5d7630b851278ce1fc385e8c
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ac7eb33
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "rust-samples"
+version = "0.1.0"
+authors = ["Matthias Andreas Benkard <code@mail.matthias.benkard.de>"]
+edition = "2018"
+
+[profile.release]
+lto = true
+#opt-level = "s"
+opt-level = 3
+debug = false
+
+[build-dependencies]
+bindgen = "0.54.0"
+cc = "1.0.55"
+
+[dependencies]
+failure = "0.1.8"
+failure_derive = "0.1.8"
+heapless = "0.5.5"
+num = "0.3.0"
+cty = "0.2.1"
diff --git a/benches/benchmarks.rs b/benches/benchmarks.rs
new file mode 100644
index 0000000..3f69369
--- /dev/null
+++ b/benches/benchmarks.rs
@@ -0,0 +1,222 @@
+#![cfg(test)]
+#![feature(test)]
+#![feature(slice_fill)]
+
+extern crate num;
+extern crate test;
+
+use rust_samples::{cswap, swap};
+
+use heapless::consts::{U10, U100, U1000, U10000, U100000, U1000000};
+use num::{one, zero, Num};
+use test::{black_box, Bencher};
+
+fn bench_swap_loop<T, N>(b: &mut Bencher)
+where
+ N: heapless::ArrayLength<T>,
+ T: Num + Copy,
+{
+ let (mut arr1, mut arr2) = bench_swap_setup::<T, N>();
+
+ b.iter(|| {
+ swap::swap_loop(&mut arr1, &mut arr2);
+ black_box(&arr1);
+ black_box(&arr2);
+ });
+}
+
+fn bench_swap_ptrswap<T, N>(b: &mut Bencher)
+where
+ N: heapless::ArrayLength<T>,
+ T: Num + Copy,
+{
+ let (mut arr1, mut arr2) = bench_swap_setup::<T, N>();
+
+ b.iter(|| {
+ swap::swap_ptrswap(&mut arr1, &mut arr2);
+ black_box(&arr1);
+ black_box(&arr2);
+ });
+}
+
+fn bench_cswap_loop<T, N>(b: &mut Bencher)
+where
+ N: heapless::ArrayLength<T>,
+ T: Num + Copy,
+{
+ let (mut arr1, mut arr2) = bench_swap_setup::<T, N>();
+
+ b.iter(|| {
+ cswap::cswap_loop(&mut arr1, &mut arr2);
+ black_box(&arr1);
+ black_box(&arr2);
+ });
+}
+
+fn bench_cswap_alloca<T, N>(b: &mut Bencher)
+where
+ N: heapless::ArrayLength<T>,
+ T: Num + Copy,
+{
+ let (mut arr1, mut arr2) = bench_swap_setup::<T, N>();
+
+ b.iter(|| {
+ cswap::cswap_alloca(&mut arr1, &mut arr2);
+ black_box(&arr1);
+ black_box(&arr2);
+ });
+}
+
+/// Allocates two vectors of fixed length on the heap.
+fn bench_swap_setup<T, N>() -> (Vec<T>, Vec<T>)
+where
+ N: heapless::ArrayLength<T>,
+ T: Num + Clone,
+{
+ let mut arr1: Vec<T> = Vec::new();
+ let mut arr2 = arr1.clone();
+
+ arr1.resize(N::to_usize(), black_box(zero()));
+ arr2.resize(N::to_usize(), black_box(one()));
+
+ (arr1, arr2)
+}
+
+/// A heapless version of `bench_swap_setup`.
+fn _bench_swap_setup_heapless<T, N>() -> (heapless::Vec<T, N>, heapless::Vec<T, N>)
+where
+ N: heapless::ArrayLength<T>,
+ T: Num + Clone,
+{
+ let mut arr1: heapless::Vec<T, N> = heapless::Vec::new();
+ let mut arr2 = arr1.clone();
+
+ arr1.resize(N::to_usize(), black_box(zero()))
+ .expect("insufficient stack space");
+ arr2.resize(N::to_usize(), black_box(one()))
+ .expect("insufficient stack space");
+
+ (arr1, arr2)
+}
+
+type BenchInt = u8;
+
+#[bench]
+fn bench_swap_loop_len_10(b: &mut Bencher) {
+ bench_swap_loop::<BenchInt, U10>(b);
+}
+
+#[bench]
+fn bench_swap_loop_len_100(b: &mut Bencher) {
+ bench_swap_loop::<BenchInt, U100>(b);
+}
+
+#[bench]
+fn bench_swap_loop_len_1000(b: &mut Bencher) {
+ bench_swap_loop::<BenchInt, U1000>(b);
+}
+
+#[bench]
+fn bench_swap_loop_len_10000(b: &mut Bencher) {
+ bench_swap_loop::<BenchInt, U10000>(b);
+}
+
+#[bench]
+fn bench_swap_loop_len_100000(b: &mut Bencher) {
+ bench_swap_loop::<BenchInt, U100000>(b);
+}
+
+#[bench]
+fn bench_swap_loop_len_1000000(b: &mut Bencher) {
+ bench_swap_loop::<BenchInt, U1000000>(b);
+}
+
+#[bench]
+fn bench_swap_ptrswap_len_10(b: &mut Bencher) {
+ bench_swap_ptrswap::<BenchInt, U10>(b);
+}
+
+#[bench]
+fn bench_swap_ptrswap_len_100(b: &mut Bencher) {
+ bench_swap_ptrswap::<BenchInt, U100>(b);
+}
+
+#[bench]
+fn bench_swap_ptrswap_len_1000(b: &mut Bencher) {
+ bench_swap_ptrswap::<BenchInt, U1000>(b);
+}
+
+#[bench]
+fn bench_swap_ptrswap_len_10000(b: &mut Bencher) {
+ bench_swap_ptrswap::<BenchInt, U10000>(b);
+}
+
+#[bench]
+fn bench_swap_ptrswap_len_100000(b: &mut Bencher) {
+ bench_swap_ptrswap::<BenchInt, U100000>(b);
+}
+
+#[bench]
+fn bench_swap_ptrswap_len_1000000(b: &mut Bencher) {
+ bench_swap_ptrswap::<BenchInt, U1000000>(b);
+}
+
+#[bench]
+fn bench_cswap_loop_len_10(b: &mut Bencher) {
+ bench_cswap_loop::<BenchInt, U10>(b);
+}
+
+#[bench]
+fn bench_cswap_loop_len_100(b: &mut Bencher) {
+ bench_cswap_loop::<BenchInt, U100>(b);
+}
+
+#[bench]
+fn bench_cswap_loop_len_1000(b: &mut Bencher) {
+ bench_cswap_loop::<BenchInt, U1000>(b);
+}
+
+#[bench]
+fn bench_cswap_loop_len_10000(b: &mut Bencher) {
+ bench_cswap_loop::<BenchInt, U10000>(b);
+}
+
+#[bench]
+fn bench_cswap_loop_len_100000(b: &mut Bencher) {
+ bench_cswap_loop::<BenchInt, U100000>(b);
+}
+
+#[bench]
+fn bench_cswap_loop_len_1000000(b: &mut Bencher) {
+ bench_cswap_loop::<BenchInt, U1000000>(b);
+}
+
+#[bench]
+fn bench_cswap_alloca_len_10(b: &mut Bencher) {
+ bench_cswap_alloca::<BenchInt, U10>(b);
+}
+
+#[bench]
+fn bench_cswap_alloca_len_100(b: &mut Bencher) {
+ bench_cswap_alloca::<BenchInt, U100>(b);
+}
+
+#[bench]
+fn bench_cswap_alloca_len_1000(b: &mut Bencher) {
+ bench_cswap_alloca::<BenchInt, U1000>(b);
+}
+
+#[bench]
+fn bench_cswap_alloca_len_10000(b: &mut Bencher) {
+ bench_cswap_alloca::<BenchInt, U10000>(b);
+}
+
+#[bench]
+fn bench_cswap_alloca_len_100000(b: &mut Bencher) {
+ bench_cswap_alloca::<BenchInt, U100000>(b);
+}
+
+#[bench]
+fn bench_cswap_alloca_len_1000000(b: &mut Bencher) {
+ bench_cswap_alloca::<BenchInt, U1000000>(b);
+}
diff --git a/bindings.h b/bindings.h
new file mode 100644
index 0000000..e523327
--- /dev/null
+++ b/bindings.h
@@ -0,0 +1 @@
+#include "c/swap.h"
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..3bd87c0
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,24 @@
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+ // Generate C header bindings.
+ println!("cargo:rerun-if-changed=wrapper.h");
+
+ let bindings = bindgen::Builder::default()
+ .header("bindings.h")
+ .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+ .generate()
+ .expect("Unable to generate C bindings");
+
+ let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+ bindings
+ .write_to_file(out_path.join("bindings.rs"))
+ .expect("Unable to write bindings.rs");
+
+ // Compile C code.
+ cc::Build::new()
+ .file("c/swap.c")
+ .flag("-std=c17")
+ .compile("swap");
+}
diff --git a/c/swap.c b/c/swap.c
new file mode 100644
index 0000000..657ae9d
--- /dev/null
+++ b/c/swap.c
@@ -0,0 +1,27 @@
+#include "swap.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+void swap_loop(char* restrict a, char* restrict b, size_t len) {
+ while (len--) {
+ char tmp = *a;
+ *a++ = *b;
+ *b++ = tmp;
+ };
+}
+
+void swap_malloc(char* restrict a, char* restrict b, size_t len) {
+ char *temp = malloc(len);
+ memmove(temp,a,len);
+ memmove(a,b,len);
+ memmove(b,temp,len);
+ free(temp);
+}
+
+void swap_alloca(char* restrict a, char* restrict b, size_t len) {
+ char temp[len];
+ memmove(temp,a,len);
+ memmove(a,b,len);
+ memmove(b,temp,len);
+}
diff --git a/c/swap.h b/c/swap.h
new file mode 100644
index 0000000..f24d2fe
--- /dev/null
+++ b/c/swap.h
@@ -0,0 +1,5 @@
+#include <stddef.h>
+
+void swap_loop(char* restrict a, char* restrict b, size_t len);
+void swap_malloc(char* restrict a, char* restrict b, size_t len);
+void swap_alloca(char* restrict a, char* restrict b, size_t len);
diff --git a/src/bindings.rs b/src/bindings.rs
new file mode 100644
index 0000000..ca24cc3
--- /dev/null
+++ b/src/bindings.rs
@@ -0,0 +1,6 @@
+#![allow(dead_code)]
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
diff --git a/src/cswap.rs b/src/cswap.rs
new file mode 100644
index 0000000..b509481
--- /dev/null
+++ b/src/cswap.rs
@@ -0,0 +1,35 @@
+//extern "C" fn swap_loop(a: *mut cty::c_char, b: *mut cty::c_char, n: cty::c_int);
+
+use crate::bindings;
+use std::cmp::min;
+use std::mem::size_of;
+
+pub fn cswap_loop<T>(a: &mut [T], b: &mut [T]) {
+ unsafe {
+ bindings::swap_loop(
+ a.as_mut_ptr() as *mut i8,
+ b.as_mut_ptr() as *mut i8,
+ (size_of::<T>() * min(a.len(), b.len())) as bindings::size_t,
+ )
+ }
+}
+
+pub fn cswap_malloc<T>(a: &mut [T], b: &mut [T]) {
+ unsafe {
+ bindings::swap_malloc(
+ a.as_mut_ptr() as *mut i8,
+ b.as_mut_ptr() as *mut i8,
+ (size_of::<T>() * min(a.len(), b.len())) as bindings::size_t,
+ )
+ }
+}
+
+pub fn cswap_alloca<T>(a: &mut [T], b: &mut [T]) {
+ unsafe {
+ bindings::swap_alloca(
+ a.as_mut_ptr() as *mut i8,
+ b.as_mut_ptr() as *mut i8,
+ (size_of::<T>() * min(a.len(), b.len())) as bindings::size_t,
+ )
+ }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..62e269a
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,7 @@
+extern crate cty;
+extern crate num;
+
+mod bindings;
+
+pub mod cswap;
+pub mod swap;
diff --git a/src/swap.rs b/src/swap.rs
new file mode 100644
index 0000000..ef07130
--- /dev/null
+++ b/src/swap.rs
@@ -0,0 +1,23 @@
+use core::{mem, ptr};
+use num::Num;
+use std::cmp::min;
+
+pub fn swap_loop<T>(a: &mut [T], b: &mut [T]) {
+ for (x, y) in a.iter_mut().zip(b.iter_mut()) {
+ mem::swap(x, y);
+ }
+}
+
+pub fn swap_ptrswap<T>(a: &mut [T], b: &mut [T]) {
+ unsafe { ptr::swap_nonoverlapping(a.as_mut_ptr(), b.as_mut_ptr(), min(a.len(), b.len())) }
+}
+
+/// Exactly equivalent to `swap_2`, but trades the use of unsafe operations against having to know
+/// the exact type and size of the vector at compile time. Only works with `heapless::Vec`.
+pub fn swap_3<T, N>(a: &mut heapless::Vec<T, N>, b: &mut heapless::Vec<T, N>)
+where
+ N: heapless::ArrayLength<T>,
+ T: Num + Copy,
+{
+ mem::swap(a, b);
+}