Vendor things

third-party/vendor/bit-vec/benches/bench.rs

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+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(test)]
+
+extern crate test;
+extern crate rand;
+extern crate rand_xorshift;
+extern crate bit_vec;
+
+use test::{Bencher, black_box};
+use rand::{Rng, RngCore, SeedableRng};
+use rand_xorshift::XorShiftRng;
+use bit_vec::BitVec;
+
+const HUGE_BENCH_BITS : usize = 1 << 20;
+const BENCH_BITS : usize = 1 << 14;
+const U32_BITS: usize = 32;
+
+fn small_rng() -> XorShiftRng {
+    XorShiftRng::from_entropy()
+}
+
+#[bench]
+fn bench_usize_small(b: &mut Bencher) {
+    let mut r = small_rng();
+    let mut bit_vec = 0 as usize;
+    b.iter(|| {
+        for _ in 0..100 {
+            bit_vec |= 1 << ((r.next_u32() as usize) % U32_BITS);
+        }
+        black_box(&bit_vec);
+    });
+}
+
+#[bench]
+fn bench_bit_set_big_fixed(b: &mut Bencher) {
+    let mut r = small_rng();
+    let mut bit_vec = BitVec::from_elem(BENCH_BITS, false);
+    b.iter(|| {
+        for _ in 0..100 {
+            bit_vec.set((r.next_u32() as usize) % BENCH_BITS, true);
+        }
+        black_box(&bit_vec);
+    });
+}
+
+#[bench]
+fn bench_bit_set_big_variable(b: &mut Bencher) {
+    let mut r = small_rng();
+    let mut bit_vec = BitVec::from_elem(BENCH_BITS, false);
+    b.iter(|| {
+        for _ in 0..100 {
+            bit_vec.set((r.next_u32() as usize) % BENCH_BITS, r.gen());
+        }
+        black_box(&bit_vec);
+    });
+}
+
+#[bench]
+fn bench_bit_set_small(b: &mut Bencher) {
+    let mut r = small_rng();
+    let mut bit_vec = BitVec::from_elem(U32_BITS, false);
+    b.iter(|| {
+        for _ in 0..100 {
+            bit_vec.set((r.next_u32() as usize) % U32_BITS, true);
+        }
+        black_box(&bit_vec);
+    });
+}
+
+#[bench]
+fn bench_bit_vec_big_or(b: &mut Bencher) {
+    let mut b1 = BitVec::from_elem(BENCH_BITS, false);
+    let b2 = BitVec::from_elem(BENCH_BITS, false);
+    b.iter(|| {
+        b1.or(&b2)
+    })
+}
+
+#[bench]
+fn bench_bit_vec_big_xnor(b: &mut Bencher) {
+    let mut b1 = BitVec::from_elem(BENCH_BITS, false);
+    let b2 = BitVec::from_elem(BENCH_BITS, false);
+    b.iter(|| {
+        b1.xnor(&b2)
+    })
+}
+
+#[bench]
+fn bench_bit_vec_big_negate_xor(b: &mut Bencher) {
+    let mut b1 = BitVec::from_elem(BENCH_BITS, false);
+    let b2 = BitVec::from_elem(BENCH_BITS, false);
+    b.iter(|| {
+        let res = b1.xor(&b2);
+        b1.negate();
+        res
+    })
+}
+
+#[bench]
+fn bench_bit_vec_huge_xnor(b: &mut Bencher) {
+    let mut b1 = BitVec::from_elem(HUGE_BENCH_BITS, false);
+    let b2 = BitVec::from_elem(HUGE_BENCH_BITS, false);
+    b.iter(|| {
+        b1.xnor(&b2)
+    })
+}
+
+#[bench]
+fn bench_bit_vec_huge_negate_xor(b: &mut Bencher) {
+    let mut b1 = BitVec::from_elem(HUGE_BENCH_BITS, false);
+    let b2 = BitVec::from_elem(HUGE_BENCH_BITS, false);
+    b.iter(|| {
+        let res = b1.xor(&b2);
+        b1.negate();
+        res
+    })
+}
+
+#[bench]
+fn bench_bit_vec_small_iter(b: &mut Bencher) {
+    let bit_vec = BitVec::from_elem(U32_BITS, false);
+    b.iter(|| {
+        let mut sum = 0;
+        for _ in 0..10 {
+            for pres in &bit_vec {
+                sum += pres as usize;
+            }
+        }
+        sum
+    })
+}
+
+#[bench]
+fn bench_bit_vec_big_iter(b: &mut Bencher) {
+    let bit_vec = BitVec::from_elem(BENCH_BITS, false);
+    b.iter(|| {
+        let mut sum = 0;
+        for pres in &bit_vec {
+            sum += pres as usize;
+        }
+        sum
+    })
+}
+
+#[bench]
+fn bench_from_elem(b: &mut Bencher) {
+    let cap = black_box(BENCH_BITS);
+    let bit = black_box(true);
+    b.iter(|| {
+        // create a BitVec and popcount it
+        BitVec::from_elem(cap, bit).blocks()
+            .fold(0, |acc, b| acc + b.count_ones())
+    });
+    b.bytes = cap as u64 / 8;
+}
+
+#[bench]
+fn bench_erathostenes(b: &mut test::Bencher) {
+    let mut primes = vec![];
+    b.iter(|| {
+        primes.clear();
+        let mut sieve = BitVec::from_elem(1 << 16, true);
+        black_box(&mut sieve);
+        let mut i = 2;
+        while i < sieve.len() {
+            if sieve[i] == true {
+                primes.push(i);
+            }
+            let mut j = i;
+            while j < sieve.len() {
+                sieve.set(j, false);
+                j += i;
+            }
+            i += 1;
+        }
+        black_box(&mut sieve);
+    });
+}
+
+#[bench]
+fn bench_erathostenes_set_all(b: &mut test::Bencher) {
+    let mut primes = vec![];
+    let mut sieve = BitVec::from_elem(1 << 16, true);
+    b.iter(|| {
+        primes.clear();
+        black_box(&mut sieve);
+        sieve.set_all();
+        black_box(&mut sieve);
+        let mut i = 2;
+        while i < sieve.len() {
+            if sieve[i] == true {
+                primes.push(i);
+            }
+            let mut j = i;
+            while j < sieve.len() {
+                sieve.set(j, false);
+                j += i;
+            }
+            i += 1;
+        }
+        black_box(&mut sieve);
+    });
+}