ports: port peachpy go projects to avo

[mmcloughlin]

trafficstars

Consider porting existing PeachPy Go projects to avo. At a minimum this would be really valuable feedback and system-level testing for avo. These could be committed to the avo examples directory or potentially committed back to the original repos if their maintainers are interested.

Repository	Description	Stars
Yawning/chacha20	ChaCha20 cryptographic cipher.	33
Yawning/aez	AEZ authenticated-encryption scheme.	6
robskie/bp128	SIMD-BP128 integer encoding and decoding.	22
dgryski/go-marvin32	Microsoft's Marvin32 hash function.	7
dgryski/go-highway	Google's Highway hash function.	55
dgryski/go-metro	MetroHash function.	66
dgryski/go-stadtx	Stadtx hash function. See examples/stadtx	7
dgryski/go-sip13	SipHash 1-3 function.	17
dgryski/go-chaskey	Chaskey MAC.	5
dgryski/go-speck	SPECK cipher.	7
dgryski/go-bloomindex	Bloom-filter based search index.	79
dgryski/go-groupvariant	SSE-optimized group varint integer encoding.	25
bwesterb/go-sha256x8	Eight-way SHA256	0
gtank/ed25519	radix51 sub-package originally generated with PeachPy	8

[dgryski]

Porting my projects definitely on my TODO list. Start small then work big. Small are SPECK, marvin32, sip13. Maybe bloomindex. Medium are metro, chaskey, groupvarint. Large highway.

[dgryski]

Marvin32: https://github.com/dgryski/go-marvin32/blob/master/asm.go

[dgryski]

Sip13: https://github.com/dgryski/go-sip13/blob/master/asm.go

[dgryski]

SPECK: https://github.com/dgryski/go-speck/blob/master/asm.go

[dgryski]

groupvarint not worth converting. Only a single tiny asm routine. Removed peachpy but left the generated 10-line function.

[dgryski]

Will probably not convert stadtx, as you've already done that.

[mmcloughlin]

Will probably not convert stadtx, as you've already done that.

Please feel free to copy that code into your repo.

[dgryski]

https://github.com/dgryski/go-bloomindex/blob/master/asm.go

[dgryski]

Also did https://github.com/dgryski/trifles/blob/master/tsip/go/asm.go (not on the list)

[dgryski]

https://github.com/dgryski/go-chaskey/blob/master/asm.go

Notable in this one is the loop helper type.

type loop string

var loops int

func newLoop(name string) loop {
	loops++
         if name == "" { name = "loop" }
	return loop(name + strconv.Itoa(loops-1))
}

func (l loop) begin() string { return string(l) + "_begin" }
func (l loop) end() string   { return string(l) + "_end" }