435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
77 lines
1.5 KiB
Go
77 lines
1.5 KiB
Go
// +build !amd64 appengine !gc purego
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package xxhash
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// Sum64 computes the 64-bit xxHash digest of b.
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func Sum64(b []byte) uint64 {
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// A simpler version would be
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// d := New()
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// d.Write(b)
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// return d.Sum64()
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// but this is faster, particularly for small inputs.
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n := len(b)
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var h uint64
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if n >= 32 {
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v1 := prime1v + prime2
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v2 := prime2
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v3 := uint64(0)
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v4 := -prime1v
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for len(b) >= 32 {
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v1 = round(v1, u64(b[0:8:len(b)]))
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v2 = round(v2, u64(b[8:16:len(b)]))
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v3 = round(v3, u64(b[16:24:len(b)]))
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v4 = round(v4, u64(b[24:32:len(b)]))
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b = b[32:len(b):len(b)]
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}
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h = rol1(v1) + rol7(v2) + rol12(v3) + rol18(v4)
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h = mergeRound(h, v1)
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h = mergeRound(h, v2)
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h = mergeRound(h, v3)
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h = mergeRound(h, v4)
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} else {
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h = prime5
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}
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h += uint64(n)
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i, end := 0, len(b)
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for ; i+8 <= end; i += 8 {
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k1 := round(0, u64(b[i:i+8:len(b)]))
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h ^= k1
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h = rol27(h)*prime1 + prime4
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}
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if i+4 <= end {
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h ^= uint64(u32(b[i:i+4:len(b)])) * prime1
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h = rol23(h)*prime2 + prime3
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i += 4
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}
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for ; i < end; i++ {
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h ^= uint64(b[i]) * prime5
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h = rol11(h) * prime1
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}
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h ^= h >> 33
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h *= prime2
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h ^= h >> 29
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h *= prime3
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h ^= h >> 32
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return h
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}
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func writeBlocks(d *Digest, b []byte) int {
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v1, v2, v3, v4 := d.v1, d.v2, d.v3, d.v4
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n := len(b)
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for len(b) >= 32 {
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v1 = round(v1, u64(b[0:8:len(b)]))
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v2 = round(v2, u64(b[8:16:len(b)]))
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v3 = round(v3, u64(b[16:24:len(b)]))
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v4 = round(v4, u64(b[24:32:len(b)]))
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b = b[32:len(b):len(b)]
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}
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d.v1, d.v2, d.v3, d.v4 = v1, v2, v3, v4
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return n - len(b)
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}
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