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do not unroll the rounds loop

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This commit is contained in:
newpavlov 2018-03-27 19:28:37 +03:00
parent a417e97a41
commit fcb42fe8d1
1 changed files with 4 additions and 5 deletions
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9
keccak/src/lib.rs
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@ -1,8 +1,5 @@
//! Keccak [sponge function](https://en.wikipedia.org/wiki/Sponge_function).
//!
//! The function code is fully unrolled and is nearly as fast as the Keccak
//! team's optimized implementation.
//!
//! If you are looking for SHA-3 hash functions take a look at [`sha3`][1] and
//! [`tiny-keccak`][2] crates.
//!
@ -140,7 +137,9 @@ macro_rules! unroll24 {
pub fn f1600(a: &mut [u64; PLEN]) {
let mut arrays: [[u64; 5]; 24] = [[0; 5]; 24];
unroll24!(i, {
// not unrolling this loop results in a much smaller function, plus
// it positively influences performance due to the smaller load on I-cache
for i in 0..24 {
// Theta
unroll5!(x, {
// This looks useless but it gets way slower without it. I tried
@ -190,5 +189,5 @@ pub fn f1600(a: &mut [u64; PLEN]) {
// Iota
a[0] ^= RC[i];
});
}
}