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Parallelize the checking of the first two bytes of a potential match. #259

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merged 1 commit into from
Dec 8, 2024
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Parallelize the checking of the first two bytes of a potential match. #259

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7 changes: 6 additions & 1 deletion zlib-rs/src/deflate/algorithm/quick.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -100,7 +100,12 @@ pub fn deflate_quick(stream: &mut DeflateStream, flush: DeflateFlush) -> BlockSt
let str_start = &state.window.filled()[state.strstart..];
let match_start = &state.window.filled()[hash_head as usize..];

if str_start[0] == match_start[0] && str_start[1] == match_start[1] {
macro_rules! first_two_bytes {
($slice:expr, $offset:expr) => {
$slice[$offset] as u16 | ($slice[$offset + 1] as u16) << 8
}
}
if first_two_bytes!(str_start, 0) == first_two_bytes!(match_start, 0) {
let mut match_len = crate::deflate::compare256::compare256_slice(
&str_start[2..],
&match_start[2..],
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