mixing: Avoid hash.Hash and Sum(nil) calls#3603
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Nice changes. Glad to see the new zero-alloc blake256 API getting some use.
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Versus master:
name old alloc/op new alloc/op delta
----------------------------------------------------------------------------------
SignUtxoProof 1.06kB ± 0% 1.02kB ± 0% -3.03% (p=0.000 n=10+10)
ValidateSecp256k1P2PKH 192B ± 0% 160B ± 0% -16.67% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
-----------------------------------------------------------------------------------
SignUtxoProof 18.0 ± 0% 17.0 ± 0% -5.56% (p=0.000 n=10+10)
ValidateSecp256k1P2PKH 3.00 ± 0% 2.00 ± 0% -33.33% (p=0.000 n=10+10)
Sum(nil) creates an unnecessary heap allocation appending the digest to the nil slice. Replace these calls with direct calls to the (*blake256.Hasher256).Sum256 method to avoid unnecessary allocations and copies. While here, use the hasher's specialized Write* methods in the utxoproof package to improve readability.
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Sum(nil) creates an unnecessary heap allocation appending the digest to the nil slice. Replace these calls with direct calls to the (*blake256.Hasher256).Sum256 method to avoid unnecessary allocations and copies.