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util: reduce allocations in util.Uint256DecodeStringLE
It is used a lot in clients (including our benchmark). `Uint160` is already optimized. ``` name old time/op new time/op delta Uint256DecodeStringLE-8 150ns ±15% 112ns ± 3% -25.23% (p=0.000 n=10+10) name old alloc/op new alloc/op delta Uint256DecodeStringLE-8 96.0B ± 0% 64.0B ± 0% -33.33% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Uint256DecodeStringLE-8 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.000 n=10+10) ``` Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
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2 changed files with 15 additions and 1 deletions
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@ -26,7 +26,8 @@ func Uint256DecodeStringLE(s string) (u Uint256, err error) {
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if err != nil {
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return u, err
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}
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return Uint256DecodeBytesLE(b)
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slice.Reverse(b)
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return Uint256DecodeBytesBE(b)
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}
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// Uint256DecodeStringBE attempts to decode the given string (in BE representation)
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@ -95,3 +95,16 @@ func TestUint256_Serializable(t *testing.T) {
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var b util.Uint256
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testserdes.EncodeDecodeBinary(t, &a, &b)
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}
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func BenchmarkUint256DecodeStringLE(b *testing.B) {
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a := "f037308fa0ab18155bccfc08485468c112409ea5064595699e98c545f245f32d"
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b.ResetTimer()
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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_, err := util.Uint256DecodeStringLE(a)
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if err != nil {
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b.FailNow()
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}
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}
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}
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