| #![feature(slice_patterns)] |
| #![feature(test)] |
| |
| extern crate test; |
| |
| use test::Bencher; |
| |
| // 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 &dyn 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 option_some(b: &mut Bencher) { |
| let x = Some(10); |
| b.iter(|| { |
| match x { |
| Some(y) => y, |
| None => 11 |
| } |
| }); |
| } |
| |
| #[bench] |
| fn vec_pattern(b: &mut Bencher) { |
| let x = [1,2,3,4,5,6]; |
| b.iter(|| { |
| match x { |
| [1,2,3,..] => 10, |
| _ => 11, |
| } |
| }); |
| } |