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| author | Manish Goregaokar <manishsmail@gmail.com> | 2020-06-26 13:57:31 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-06-26 13:57:31 -0700 |
| commit | 23b0776a594a0728a7706521c5193245de2ea823 (patch) | |
| tree | 06e88616646e49ae05a600232443f342088a937c /src/test/codegen/src-hash-algorithm/src-hash-algorithm-md5.rs | |
| parent | f13d09abe1d7a02007ac8591dc409c8d820b903a (diff) | |
| parent | f66bcc5459d4a720b31eaeac3149f19799118d72 (diff) | |
| download | rust-23b0776a594a0728a7706521c5193245de2ea823.tar.gz rust-23b0776a594a0728a7706521c5193245de2ea823.zip | |
Rollup merge of #73529 - pickfire:liballoc-specfromelem-i8, r=cuviper
Add liballoc impl SpecFromElem for i8
Speedup vec![1_i8; N] for non-zero element.
Before
test do_bench_from_elem_i8 ... bench: 130 ns/iter (+/- 7) = 61 MB/s
test do_bench_from_elem_u8 ... bench: 121 ns/iter (+/- 4) = 66 MB/s
After
test do_bench_from_elem_i8 ... bench: 123 ns/iter (+/- 7) = 65 MB/s
test do_bench_from_elem_u8 ... bench: 121 ns/iter (+/- 5) = 66 MB/s
No speed difference if element is already zero.
```rust
#[bench]
fn do_bench_from_elem_i8(b: &mut Bencher) {
b.bytes = 8 as u64;
b.iter(|| {
let dst = ve::vec![10_i8; 100];
assert_eq!(dst.len(), 100);
assert!(dst.iter().all(|x| *x == 10));
})
}
```
As suggested by @cuviper
https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/SpecForElem.20for.20other.20integers
r? @cuviper
CC @joshtriplett
Edit: Wow, I just realized both reviewers are Josh.
Diffstat (limited to 'src/test/codegen/src-hash-algorithm/src-hash-algorithm-md5.rs')
0 files changed, 0 insertions, 0 deletions