Unroll one more loop
I also tried unrolling the 256-iteration loop further below, but it actually caused a slowdown (my guess is either branch prediction stopped kicking in or the instruction cache was being maculated).
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parent
d51958dbf5
commit
2cc1c92901
6
Cargo.lock
generated
6
Cargo.lock
generated
@ -256,7 +256,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "crunchy"
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version = "0.1.0"
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version = "0.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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@ -365,7 +365,7 @@ dependencies = [
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name = "ethash"
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version = "1.7.0"
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dependencies = [
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"crunchy 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"crunchy 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"log 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
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"parking_lot 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"primal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -2949,7 +2949,7 @@ dependencies = [
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"checksum core-foundation 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "20a6d0448d3a99d977ae4a2aa5a98d886a923e863e81ad9ff814645b6feb3bbd"
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"checksum core-foundation-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "05eed248dc504a5391c63794fe4fb64f46f071280afaa1b73308f3c0ce4574c5"
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"checksum crossbeam 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "0c5ea215664ca264da8a9d9c3be80d2eaf30923c259d03e870388eb927508f97"
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"checksum crunchy 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b56bdac907d4b64254aed43964b11dd334bc46e0826a0e3add75caddfaf90175"
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"checksum crunchy 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "803315676d3fc09db67636977586262e7d1a6c5bdb291810efd5ceb48a0d5d58"
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"checksum crypt32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e34988f7e069e0b2f3bfc064295161e489b2d4e04a2e4248fb94360cdf00b4ec"
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"checksum ctrlc 1.1.1 (git+https://github.com/paritytech/rust-ctrlc.git)" = "<none>"
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"checksum daemonize 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "271ec51b7e0bee92f0d04601422c73eb76ececf197026711c97ad25038a010cf"
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@ -298,7 +298,7 @@ fn hash_compute(light: &Light, full_size: usize, header_hash: &H256, nonce: u64)
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let index = fnv_hash(
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f_mix.get_unchecked(0).as_words().get_unchecked(0) ^ i,
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*mix.get_unchecked(0).as_words().get_unchecked(i_usize % MIX_WORDS)
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*mix.get_unchecked(0).as_words().get_unchecked(i as usize % MIX_WORDS)
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) % num_full_pages;
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unroll! {
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@ -324,8 +324,11 @@ fn hash_compute(light: &Light, full_size: usize, header_hash: &H256, nonce: u64)
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}
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}
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debug_assert_eq!(MIX_WORDS / 4, 8);
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// compress mix
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for i in 0..(MIX_WORDS / 4) {
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unroll! {
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for i in 0..8 {
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let w = i * 4;
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let mut reduction = *mix.get_unchecked(0).as_words().get_unchecked(w + 0);
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reduction = reduction.wrapping_mul(FNV_PRIME) ^ *mix.get_unchecked(0).as_words().get_unchecked(w + 1);
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@ -333,6 +336,7 @@ fn hash_compute(light: &Light, full_size: usize, header_hash: &H256, nonce: u64)
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reduction = reduction.wrapping_mul(FNV_PRIME) ^ *mix.get_unchecked(0).as_words().get_unchecked(w + 3);
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*mix.get_unchecked_mut(0).as_words_mut().get_unchecked_mut(i) = reduction;
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}
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}
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let mut mix_hash = [0u8; 32];
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let mut buf = [0u8; 32 + 64];
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@ -356,13 +360,15 @@ fn calculate_dag_item(node_index: u32, cache: &[Node]) -> Node {
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*ret.as_words_mut().get_unchecked_mut(0) ^= node_index;
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sha3::sha3_512(ret.bytes.as_mut_ptr(), ret.bytes.len(), ret.bytes.as_ptr(), ret.bytes.len());
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for i in 0..ETHASH_DATASET_PARENTS {
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for i_usize in 0..ETHASH_DATASET_PARENTS {
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let i = i_usize as u32;
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let parent_index = fnv_hash(node_index ^ i, *ret.as_words().get_unchecked(i as usize % NODE_WORDS)) % num_parent_nodes as u32;
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let parent = cache.get_unchecked(parent_index as usize);
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for w in 0..NODE_WORDS {
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*ret.as_words_mut().get_unchecked_mut(w) = fnv_hash(*ret.as_words().get_unchecked(w), *parent.as_words().get_unchecked(w));
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}
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}
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sha3::sha3_512(ret.bytes.as_mut_ptr(), ret.bytes.len(), ret.bytes.as_ptr(), ret.bytes.len());
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ret
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}
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@ -386,6 +392,7 @@ fn light_new(block_number: u64) -> Light {
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sha3::sha3_512(nodes.get_unchecked_mut(i).bytes.as_mut_ptr(), NODE_BYTES, nodes.get_unchecked(i - 1).bytes.as_ptr(), NODE_BYTES);
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}
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// This _should_ get unrolled by the compiler, since it's not using the loop variable.
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for _ in 0..ETHASH_CACHE_ROUNDS {
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for i in 0..num_nodes {
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let idx = *nodes.get_unchecked_mut(i).as_words().get_unchecked(0) as usize % num_nodes;
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