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rustc -C opt-level=3 --test deriveenum.rs && ./deriveenum --bench
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| #![allow(dead_code)] | |
| #![feature(test)] | |
| extern crate test; | |
| use test::Bencher; | |
| use std::mem; | |
| #[derive(Copy, Clone, PartialEq)] | |
| enum EnumX { A = 0, B, C, D, E, F, G, H, I, J } | |
| fn eq_manual(x: &EnumX, y: &EnumX) -> bool { | |
| *x as u8 == *y as u8 | |
| } | |
| #[bench] | |
| fn find_eq(b: &mut Bencher) { | |
| let mut v = Vec::new(); | |
| for i in 0..255 { | |
| unsafe { | |
| let evalue: EnumX = mem::transmute(i % (EnumX::J as u8)); | |
| v.push(evalue); | |
| } | |
| } | |
| b.iter(||{ | |
| // search for J using == | |
| v.iter().position(|elt| *elt == EnumX::J) | |
| }) | |
| } | |
| #[bench] | |
| fn find_ne(b: &mut Bencher) { | |
| let mut v = Vec::new(); | |
| for i in 0..255 { | |
| unsafe { | |
| let evalue: EnumX = mem::transmute(i % (EnumX::J as u8)); | |
| v.push(evalue); | |
| } | |
| } | |
| b.iter(||{ | |
| // search for J using != | |
| v.iter().position(|elt| !(*elt != EnumX::J)) | |
| }) | |
| } | |
| #[bench] | |
| fn find_manual(b: &mut Bencher) { | |
| let mut v = Vec::new(); | |
| for i in 0..255 { | |
| unsafe { | |
| let evalue: EnumX = mem::transmute(i % (EnumX::J as u8)); | |
| v.push(evalue); | |
| } | |
| } | |
| b.iter(||{ | |
| // search for J using manual | |
| v.iter().position(|elt| eq_manual(elt, &EnumX::J)) | |
| }) | |
| } |
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