Extract libcore benchmarks to a separate folder

13 files changed, 664 insertions, 4 deletions

diff --git a/src/libcore/Cargo.toml b/src/libcore/Cargo.toml
index e0dbc096cd0..4f7cd7b016d 100644
--- a/src/libcore/Cargo.toml
+++ b/src/libcore/Cargo.toml
@@ -13,7 +13,6 @@ bench = false
 name = "coretest"
 path = "../libcoretest/lib.rs"
 
-# FIXME: need to extract benchmarks to a separate crate
-#[[bench]]
-#name = "coretest"
-#path = "../libcoretest/lib.rs"
+[[bench]]
+name = "corebench"
+path = "../libcore/bench/lib.rs"
diff --git a/src/libcore/bench/any.rs b/src/libcore/bench/any.rs
new file mode 100644
index 00000000000..67e02cf9509
--- /dev/null
+++ b/src/libcore/bench/any.rs
@@ -0,0 +1,22 @@
+// Copyright 2017 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.
+
+use core::any::*;
+use test::{Bencher, black_box};
+
+#[bench]
+fn bench_downcast_ref(b: &mut Bencher) {
+    b.iter(|| {
+        let mut x = 0;
+        let mut y = &mut x as &mut Any;
+        black_box(&mut y);
+        black_box(y.downcast_ref::<isize>() == Some(&0));
+    });
+}
diff --git a/src/libcore/bench/hash/mod.rs b/src/libcore/bench/hash/mod.rs
new file mode 100644
index 00000000000..55d9e3e0913
--- /dev/null
+++ b/src/libcore/bench/hash/mod.rs
@@ -0,0 +1,11 @@
+// Copyright 2017 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.
+
+mod sip;
diff --git a/src/libcore/bench/hash/sip.rs b/src/libcore/bench/hash/sip.rs
new file mode 100644
index 00000000000..3379c85bbec
--- /dev/null
+++ b/src/libcore/bench/hash/sip.rs
@@ -0,0 +1,151 @@
+// Copyright 2017 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.
+
+#![allow(deprecated)]
+
+use core::hash::*;
+use test::{Bencher, black_box};
+
+fn hash_bytes<H: Hasher>(mut s: H, x: &[u8]) -> u64 {
+    Hasher::write(&mut s, x);
+    s.finish()
+}
+
+fn hash_with<H: Hasher, T: Hash>(mut st: H, x: &T) -> u64 {
+    x.hash(&mut st);
+    st.finish()
+}
+
+fn hash<T: Hash>(x: &T) -> u64 {
+    hash_with(SipHasher::new(), x)
+}
+
+#[bench]
+fn bench_str_under_8_bytes(b: &mut Bencher) {
+    let s = "foo";
+    b.iter(|| {
+        assert_eq!(hash(&s), 16262950014981195938);
+    })
+}
+
+#[bench]
+fn bench_str_of_8_bytes(b: &mut Bencher) {
+    let s = "foobar78";
+    b.iter(|| {
+        assert_eq!(hash(&s), 4898293253460910787);
+    })
+}
+
+#[bench]
+fn bench_str_over_8_bytes(b: &mut Bencher) {
+    let s = "foobarbaz0";
+    b.iter(|| {
+        assert_eq!(hash(&s), 10581415515220175264);
+    })
+}
+
+#[bench]
+fn bench_long_str(b: &mut Bencher) {
+    let s = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor \
+incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud \
+exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute \
+irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla \
+pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui \
+officia deserunt mollit anim id est laborum.";
+    b.iter(|| {
+        assert_eq!(hash(&s), 17717065544121360093);
+    })
+}
+
+#[bench]
+fn bench_u32(b: &mut Bencher) {
+    let u = 162629500u32;
+    let u = black_box(u);
+    b.iter(|| {
+        hash(&u)
+    });
+    b.bytes = 8;
+}
+
+#[bench]
+fn bench_u32_keyed(b: &mut Bencher) {
+    let u = 162629500u32;
+    let u = black_box(u);
+    let k1 = black_box(0x1);
+    let k2 = black_box(0x2);
+    b.iter(|| {
+        hash_with(SipHasher::new_with_keys(k1, k2), &u)
+    });
+    b.bytes = 8;
+}
+
+#[bench]
+fn bench_u64(b: &mut Bencher) {
+    let u = 16262950014981195938u64;
+    let u = black_box(u);
+    b.iter(|| {
+        hash(&u)
+    });
+    b.bytes = 8;
+}
+
+#[bench]
+fn bench_bytes_4(b: &mut Bencher) {
+    let data = black_box([b' '; 4]);
+    b.iter(|| {
+        hash_bytes(SipHasher::default(), &data)
+    });
+    b.bytes = 4;
+}
+
+#[bench]
+fn bench_bytes_7(b: &mut Bencher) {
+    let data = black_box([b' '; 7]);
+    b.iter(|| {
+        hash_bytes(SipHasher::default(), &data)
+    });
+    b.bytes = 7;
+}
+
+#[bench]
+fn bench_bytes_8(b: &mut Bencher) {
+    let data = black_box([b' '; 8]);
+    b.iter(|| {
+        hash_bytes(SipHasher::default(), &data)
+    });
+    b.bytes = 8;
+}
+
+#[bench]
+fn bench_bytes_a_16(b: &mut Bencher) {
+    let data = black_box([b' '; 16]);
+    b.iter(|| {
+        hash_bytes(SipHasher::default(), &data)
+    });
+    b.bytes = 16;
+}
+
+#[bench]
+fn bench_bytes_b_32(b: &mut Bencher) {
+    let data = black_box([b' '; 32]);
+    b.iter(|| {
+        hash_bytes(SipHasher::default(), &data)
+    });
+    b.bytes = 32;
+}
+
+#[bench]
+fn bench_bytes_c_128(b: &mut Bencher) {
+    let data = black_box([b' '; 128]);
+    b.iter(|| {
+        hash_bytes(SipHasher::default(), &data)
+    });
+    b.bytes = 128;
+}
diff --git a/src/libcore/bench/iter.rs b/src/libcore/bench/iter.rs
new file mode 100644
index 00000000000..93d38a5bc83
--- /dev/null
+++ b/src/libcore/bench/iter.rs
@@ -0,0 +1,101 @@
+// Copyright 2017 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.
+
+use core::iter::*;
+use test::{Bencher, black_box};
+
+#[bench]
+fn bench_rposition(b: &mut Bencher) {
+    let it: Vec<usize> = (0..300).collect();
+    b.iter(|| {
+        it.iter().rposition(|&x| x <= 150);
+    });
+}
+
+#[bench]
+fn bench_skip_while(b: &mut Bencher) {
+    b.iter(|| {
+        let it = 0..100;
+        let mut sum = 0;
+        it.skip_while(|&x| { sum += x; sum < 4000 }).all(|_| true);
+    });
+}
+
+#[bench]
+fn bench_multiple_take(b: &mut Bencher) {
+    let mut it = (0..42).cycle();
+    b.iter(|| {
+        let n = it.next().unwrap();
+        for _ in 0..n {
+            it.clone().take(it.next().unwrap()).all(|_| true);
+        }
+    });
+}
+
+fn scatter(x: i32) -> i32 { (x * 31) % 127 }
+
+#[bench]
+fn bench_max_by_key(b: &mut Bencher) {
+    b.iter(|| {
+        let it = 0..100;
+        it.max_by_key(|&x| scatter(x))
+    })
+}
+
+// http://www.reddit.com/r/rust/comments/31syce/using_iterators_to_find_the_index_of_the_min_or/
+#[bench]
+fn bench_max_by_key2(b: &mut Bencher) {
+    fn max_index_iter(array: &[i32]) -> usize {
+        array.iter().enumerate().max_by_key(|&(_, item)| item).unwrap().0
+    }
+
+    let mut data = vec![0; 1638];
+    data[514] = 9999;
+
+    b.iter(|| max_index_iter(&data));
+}
+
+#[bench]
+fn bench_max(b: &mut Bencher) {
+    b.iter(|| {
+        let it = 0..100;
+        it.map(scatter).max()
+    })
+}
+
+pub fn copy_zip(xs: &[u8], ys: &mut [u8]) {
+    for (a, b) in ys.iter_mut().zip(xs) {
+        *a = *b;
+    }
+}
+
+pub fn add_zip(xs: &[f32], ys: &mut [f32]) {
+    for (a, b) in ys.iter_mut().zip(xs) {
+        *a += *b;
+    }
+}
+
+#[bench]
+fn bench_zip_copy(b: &mut Bencher) {
+    let source = vec![0u8; 16 * 1024];
+    let mut dst = black_box(vec![0u8; 16 * 1024]);
+    b.iter(|| {
+        copy_zip(&source, &mut dst)
+    })
+}
+
+#[bench]
+fn bench_zip_add(b: &mut Bencher) {
+    let source = vec![1.; 16 * 1024];
+    let mut dst = vec![0.; 16 * 1024];
+    b.iter(|| {
+        add_zip(&source, &mut dst)
+    });
+}
diff --git a/src/libcore/bench/lib.rs b/src/libcore/bench/lib.rs
new file mode 100644
index 00000000000..d2db329da79
--- /dev/null
+++ b/src/libcore/bench/lib.rs
@@ -0,0 +1,25 @@
+// Copyright 2017 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.
+
+#![deny(warnings)]
+
+#![feature(flt2dec)]
+#![feature(slice_patterns)]
+#![feature(test)]
+
+extern crate core;
+extern crate test;
+
+mod any;
+mod hash;
+mod iter;
+mod mem;
+mod num;
+mod ops;
diff --git a/src/libcore/bench/mem.rs b/src/libcore/bench/mem.rs
new file mode 100644
index 00000000000..8e541d92a7f
--- /dev/null
+++ b/src/libcore/bench/mem.rs
@@ -0,0 +1,70 @@
+// Copyright 2017 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.
+
+use test::Bencher;
+
+// FIXME #13642 (these benchmarks should be in another place)
+// Completely miscellaneous language-construct benchmarks.
+// Static/dynamic method dispatch
+
+struct Struct {
+    field: isize
+}
+
+trait Trait {
+    fn method(&self) -> isize;
+}
+
+impl Trait for Struct {
+    fn method(&self) -> isize {
+        self.field
+    }
+}
+
+#[bench]
+fn trait_vtable_method_call(b: &mut Bencher) {
+    let s = Struct { field: 10 };
+    let t = &s as &Trait;
+    b.iter(|| {
+        t.method()
+    });
+}
+
+#[bench]
+fn trait_static_method_call(b: &mut Bencher) {
+    let s = Struct { field: 10 };
+    b.iter(|| {
+        s.method()
+    });
+}
+
+// Overhead of various match forms
+
+#[bench]
+fn match_option_some(b: &mut Bencher) {
+    let x = Some(10);
+    b.iter(|| {
+        match x {
+            Some(y) => y,
+            None => 11
+        }
+    });
+}
+
+#[bench]
+fn match_vec_pattern(b: &mut Bencher) {
+    let x = [1,2,3,4,5,6];
+    b.iter(|| {
+        match x {
+            [1,2,3,..] => 10,
+            _ => 11,
+        }
+    });
+}
diff --git a/src/libcore/bench/num/dec2flt/mod.rs b/src/libcore/bench/num/dec2flt/mod.rs
new file mode 100644
index 00000000000..562866e1177
--- /dev/null
+++ b/src/libcore/bench/num/dec2flt/mod.rs
@@ -0,0 +1,68 @@
+// Copyright 2017 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.
+
+use std::f64;
+use test::Bencher;
+
+#[bench]
+fn bench_0(b: &mut Bencher) {
+    b.iter(|| "0.0".parse::<f64>());
+}
+
+#[bench]
+fn bench_42(b: &mut Bencher) {
+    b.iter(|| "42".parse::<f64>());
+}
+
+#[bench]
+fn bench_huge_int(b: &mut Bencher) {
+    // 2^128 - 1
+    b.iter(|| "170141183460469231731687303715884105727".parse::<f64>());
+}
+
+#[bench]
+fn bench_short_decimal(b: &mut Bencher) {
+    b.iter(|| "1234.5678".parse::<f64>());
+}
+
+#[bench]
+fn bench_pi_long(b: &mut Bencher) {
+    b.iter(|| "3.14159265358979323846264338327950288".parse::<f64>());
+}
+
+#[bench]
+fn bench_pi_short(b: &mut Bencher) {
+    b.iter(|| "3.141592653589793".parse::<f64>())
+}
+
+#[bench]
+fn bench_1e150(b: &mut Bencher) {
+    b.iter(|| "1e150".parse::<f64>());
+}
+
+#[bench]
+fn bench_long_decimal_and_exp(b: &mut Bencher) {
+    b.iter(|| "727501488517303786137132964064381141071e-123".parse::<f64>());
+}
+
+#[bench]
+fn bench_min_subnormal(b: &mut Bencher) {
+    b.iter(|| "5e-324".parse::<f64>());
+}
+
+#[bench]
+fn bench_min_normal(b: &mut Bencher) {
+    b.iter(|| "2.2250738585072014e-308".parse::<f64>());
+}
+
+#[bench]
+fn bench_max(b: &mut Bencher) {
+    b.iter(|| "1.7976931348623157e308".parse::<f64>());
+}
diff --git a/src/libcore/bench/num/flt2dec/mod.rs b/src/libcore/bench/num/flt2dec/mod.rs
new file mode 100644
index 00000000000..1de2bf4921f
--- /dev/null
+++ b/src/libcore/bench/num/flt2dec/mod.rs
@@ -0,0 +1,24 @@
+// Copyright 2017 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.
+
+mod strategy {
+    mod dragon;
+    mod grisu;
+}
+
+use core::num::flt2dec::{decode, DecodableFloat, FullDecoded, Decoded};
+use core::num::flt2dec::MAX_SIG_DIGITS;
+
+pub fn decode_finite<T: DecodableFloat>(v: T) -> Decoded {
+    match decode(v).1 {
+        FullDecoded::Finite(decoded) => decoded,
+        full_decoded => panic!("expected finite, got {:?} instead", full_decoded)
+    }
+}
diff --git a/src/libcore/bench/num/flt2dec/strategy/dragon.rs b/src/libcore/bench/num/flt2dec/strategy/dragon.rs
new file mode 100644
index 00000000000..6824cf40ed2
--- /dev/null
+++ b/src/libcore/bench/num/flt2dec/strategy/dragon.rs
@@ -0,0 +1,70 @@
+// Copyright 2017 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.
+
+use std::{i16, f64};
+use super::super::*;
+use core::num::flt2dec::strategy::dragon::*;
+use test::Bencher;
+
+#[bench]
+fn bench_small_shortest(b: &mut Bencher) {
+    let decoded = decode_finite(3.141592f64);
+    let mut buf = [0; MAX_SIG_DIGITS];
+    b.iter(|| format_shortest(&decoded, &mut buf));
+}
+
+#[bench]
+fn bench_big_shortest(b: &mut Bencher) {
+    let decoded = decode_finite(f64::MAX);
+    let mut buf = [0; MAX_SIG_DIGITS];
+    b.iter(|| format_shortest(&decoded, &mut buf));
+}
+
+#[bench]
+fn bench_small_exact_3(b: &mut Bencher) {
+    let decoded = decode_finite(3.141592f64);
+    let mut buf = [0; 3];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_big_exact_3(b: &mut Bencher) {
+    let decoded = decode_finite(f64::MAX);
+    let mut buf = [0; 3];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_small_exact_12(b: &mut Bencher) {
+    let decoded = decode_finite(3.141592f64);
+    let mut buf = [0; 12];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_big_exact_12(b: &mut Bencher) {
+    let decoded = decode_finite(f64::MAX);
+    let mut buf = [0; 12];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_small_exact_inf(b: &mut Bencher) {
+    let decoded = decode_finite(3.141592f64);
+    let mut buf = [0; 1024];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_big_exact_inf(b: &mut Bencher) {
+    let decoded = decode_finite(f64::MAX);
+    let mut buf = [0; 1024];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
diff --git a/src/libcore/bench/num/flt2dec/strategy/grisu.rs b/src/libcore/bench/num/flt2dec/strategy/grisu.rs
new file mode 100644
index 00000000000..82e1a858fca
--- /dev/null
+++ b/src/libcore/bench/num/flt2dec/strategy/grisu.rs
@@ -0,0 +1,77 @@
+// Copyright 2017 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.
+
+use std::{i16, f64};
+use super::super::*;
+use core::num::flt2dec::strategy::grisu::*;
+use test::Bencher;
+
+pub fn decode_finite<T: DecodableFloat>(v: T) -> Decoded {
+    match decode(v).1 {
+        FullDecoded::Finite(decoded) => decoded,
+        full_decoded => panic!("expected finite, got {:?} instead", full_decoded)
+    }
+}
+
+#[bench]
+fn bench_small_shortest(b: &mut Bencher) {
+    let decoded = decode_finite(3.141592f64);
+    let mut buf = [0; MAX_SIG_DIGITS];
+    b.iter(|| format_shortest(&decoded, &mut buf));
+}
+
+#[bench]
+fn bench_big_shortest(b: &mut Bencher) {
+    let decoded = decode_finite(f64::MAX);
+    let mut buf = [0; MAX_SIG_DIGITS];
+    b.iter(|| format_shortest(&decoded, &mut buf));
+}
+
+#[bench]
+fn bench_small_exact_3(b: &mut Bencher) {
+    let decoded = decode_finite(3.141592f64);
+    let mut buf = [0; 3];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_big_exact_3(b: &mut Bencher) {
+    let decoded = decode_finite(f64::MAX);
+    let mut buf = [0; 3];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_small_exact_12(b: &mut Bencher) {
+    let decoded = decode_finite(3.141592f64);
+    let mut buf = [0; 12];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_big_exact_12(b: &mut Bencher) {
+    let decoded = decode_finite(f64::MAX);
+    let mut buf = [0; 12];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_small_exact_inf(b: &mut Bencher) {
+    let decoded = decode_finite(3.141592f64);
+    let mut buf = [0; 1024];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
+
+#[bench]
+fn bench_big_exact_inf(b: &mut Bencher) {
+    let decoded = decode_finite(f64::MAX);
+    let mut buf = [0; 1024];
+    b.iter(|| format_exact(&decoded, &mut buf, i16::MIN));
+}
diff --git a/src/libcore/bench/num/mod.rs b/src/libcore/bench/num/mod.rs
new file mode 100644
index 00000000000..55f0bdb57ec
--- /dev/null
+++ b/src/libcore/bench/num/mod.rs
@@ -0,0 +1,12 @@
+// Copyright 2017 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.
+
+mod flt2dec;
+mod dec2flt;
diff --git a/src/libcore/bench/ops.rs b/src/libcore/bench/ops.rs
new file mode 100644
index 00000000000..7f36a4b0771
--- /dev/null
+++ b/src/libcore/bench/ops.rs
@@ -0,0 +1,30 @@
+// Copyright 2017 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.
+
+use core::ops::*;
+use test::Bencher;
+
+// Overhead of dtors
+
+struct HasDtor {
+    _x: isize
+}
+
+impl Drop for HasDtor {
+    fn drop(&mut self) {
+    }
+}
+
+#[bench]
+fn alloc_obj_with_dtor(b: &mut Bencher) {
+    b.iter(|| {
+        HasDtor { _x : 10 };
+    })
+}