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Optimize SipHash by reordering compress instructions

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mat 2024-07-01 22:36:40 +00:00
parent 7b21c18fe4
commit 16fc41cedc
2 changed files with 12 additions and 10 deletions
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11
compiler/rustc_data_structures/src/sip128.rs
View File

@ -70,18 +70,19 @@ macro_rules! compress {
($state:expr) => {{ compress!($state.v0, $state.v1, $state.v2, $state.v3) }};
($v0:expr, $v1:expr, $v2:expr, $v3:expr) => {{
$v0 = $v0.wrapping_add($v1);
$v2 = $v2.wrapping_add($v3);
$v1 = $v1.rotate_left(13);
$v1 ^= $v0;
$v0 = $v0.rotate_left(32);
$v2 = $v2.wrapping_add($v3);
$v3 = $v3.rotate_left(16);
$v3 ^= $v2;
$v0 = $v0.wrapping_add($v3);
$v3 = $v3.rotate_left(21);
$v3 ^= $v0;
$v0 = $v0.rotate_left(32);
$v2 = $v2.wrapping_add($v1);
$v0 = $v0.wrapping_add($v3);
$v1 = $v1.rotate_left(17);
$v1 ^= $v2;
$v3 = $v3.rotate_left(21);
$v3 ^= $v0;
$v2 = $v2.rotate_left(32);
}};
}

11
library/core/src/hash/sip.rs
View File

@ -76,18 +76,19 @@ macro_rules! compress {
($state:expr) => {{ compress!($state.v0, $state.v1, $state.v2, $state.v3) }};
($v0:expr, $v1:expr, $v2:expr, $v3:expr) => {{
$v0 = $v0.wrapping_add($v1);
$v2 = $v2.wrapping_add($v3);
$v1 = $v1.rotate_left(13);
$v1 ^= $v0;
$v0 = $v0.rotate_left(32);
$v2 = $v2.wrapping_add($v3);
$v3 = $v3.rotate_left(16);
$v3 ^= $v2;
$v0 = $v0.wrapping_add($v3);
$v3 = $v3.rotate_left(21);
$v3 ^= $v0;
$v0 = $v0.rotate_left(32);
$v2 = $v2.wrapping_add($v1);
$v0 = $v0.wrapping_add($v3);
$v1 = $v1.rotate_left(17);
$v1 ^= $v2;
$v3 = $v3.rotate_left(21);
$v3 ^= $v0;
$v2 = $v2.rotate_left(32);
}};
}