Fix finalization permutation

ogxd · Oct 18, 2023 · 57dee0a · 57dee0a
1 parent 75be20f
commit 57dee0a
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Showing 2 changed files with 3 additions and 4 deletions.
diff --git a/benches/throughput.rs b/benches/throughput.rs
@@ -23,7 +23,7 @@ fn gxhash_benchmark(c: &mut Criterion) {
         let mut group = c.benchmark_group("gxhash");
 
         for i in 1..8 {
-            let len = usize::pow(5, i);
+            let len = usize::pow(4, i);
 
             group.throughput(Throughput::Bytes(len as u64));
 
@@ -50,8 +50,6 @@ fn gxhash_benchmark(c: &mut Criterion) {
             let aligned_slice = &slice[0..len];
 
             use ahash::*;
-            use core::slice;
-            use std::hash::{BuildHasher};
 
             let build_hasher = RandomState::with_seeds(0, 0, 0, 0);
 

diff --git a/src/gxhash.rs b/src/gxhash.rs
@@ -182,7 +182,8 @@ mod platform_defs {
         hash = _mm256_aesdeclast_epi128(hash, keys_3);
 
         // Merge the two 128 bit lanes entropy, so we can after safely truncate up to 128-bits
-        _mm256_permute2x128_si256(hash, hash, 1)
+        let permuted = _mm256_permute2x128_si256(hash, hash, 0x21);
+        _mm256_xor_si256(hash, permuted)
     }
 }