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Add 64-byte block loop for purego #81

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Add 64-byte block loop for purego #81

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22 changes: 22 additions & 0 deletions xxhash_other.go
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,17 @@ func Sum64(b []byte) uint64 {
v2 := prime2
v3 := uint64(0)
v4 := -primes[0]
for len(b) >= 64 {
v1 = round(v1, u64(b[0:8:len(b)]))
v2 = round(v2, u64(b[8:16:len(b)]))
v3 = round(v3, u64(b[16:24:len(b)]))
v4 = round(v4, u64(b[24:32:len(b)]))
v1 = round(v1, u64(b[32:40:len(b)]))
v2 = round(v2, u64(b[40:48:len(b)]))
v3 = round(v3, u64(b[48:56:len(b)]))
v4 = round(v4, u64(b[56:64:len(b)]))
b = b[64:len(b):len(b)]
}
for len(b) >= 32 {

@greatroar greatroar Jun 29, 2025

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This can now become an if instead of a for. Same in writeBlocks.

v1 = round(v1, u64(b[0:8:len(b)]))
v2 = round(v2, u64(b[8:16:len(b)]))
Expand Down Expand Up @@ -64,6 +75,17 @@ func Sum64(b []byte) uint64 {
func writeBlocks(d *Digest, b []byte) int {
v1, v2, v3, v4 := d.v1, d.v2, d.v3, d.v4
n := len(b)
for len(b) >= 64 {
v1 = round(v1, u64(b[0:8:len(b)]))
v2 = round(v2, u64(b[8:16:len(b)]))
v3 = round(v3, u64(b[16:24:len(b)]))
v4 = round(v4, u64(b[24:32:len(b)]))
v1 = round(v1, u64(b[32:40:len(b)]))
v2 = round(v2, u64(b[40:48:len(b)]))
v3 = round(v3, u64(b[48:56:len(b)]))
v4 = round(v4, u64(b[56:64:len(b)]))
b = b[64:len(b):len(b)]
}
for len(b) >= 32 {
v1 = round(v1, u64(b[0:8:len(b)]))
v2 = round(v2, u64(b[8:16:len(b)]))
Expand Down