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rlocate/crates/squozen/bench/bench_patprep.rs

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Make prepare_pattern more Rust-like. This just removes the layer between `prepare_pattern` and `prepare_pattern_raw`; the function now always returns the allocated vector. Oddly, it wasn't possible to encode this using an Option<> in the `hunt()` function. The `usize` of the scan variable meant that we'd never go below zero legally (and Rust wouldn't let that happen), so the "if we're at zero we have some special cases to check" had to remain here. The C version of this code could say "If this pointer is below the allocated space" which is, to a Rust developer, hella weird (you're literally pointed at memory you don't own!). And despite the allocation, despite the special case checks, this code is *still* twice as fast as its C implementation.
2022-11-24 20:56:13 +00:00
use squozen::prepare_pattern::prepare_pattern;
Moved everything around so it's more project-y Added the squozen patprep function, added unit tests to the patprep `c` code, and ensured that the rust version works the same way. The only remaining code slowdown is that re-allocating the Vec 50 million times turns out to be slower than re-using the same slice of RAM over and over and over.
2022-11-11 16:31:22 +00:00
const COUNT: usize = 5 * 1000 * 1000 * 100;
fn main() {
let mut end = COUNT;
while end > 0 {
Make prepare_pattern more Rust-like. This just removes the layer between `prepare_pattern` and `prepare_pattern_raw`; the function now always returns the allocated vector. Oddly, it wasn't possible to encode this using an Option<> in the `hunt()` function. The `usize` of the scan variable meant that we'd never go below zero legally (and Rust wouldn't let that happen), so the "if we're at zero we have some special cases to check" had to remain here. The C version of this code could say "If this pointer is below the allocated space" which is, to a Rust developer, hella weird (you're literally pointed at memory you don't own!). And despite the allocation, despite the special case checks, this code is *still* twice as fast as its C implementation.
2022-11-24 20:56:13 +00:00
let _ = prepare_pattern(b"/foo/bar/whatever[0-9]*");
Moved everything around so it's more project-y Added the squozen patprep function, added unit tests to the patprep `c` code, and ensured that the rust version works the same way. The only remaining code slowdown is that re-allocating the Vec 50 million times turns out to be slower than re-using the same slice of RAM over and over and over.
2022-11-11 16:31:22 +00:00
end = end - 1;
}
}