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rlp: optimize intsize (#32421)

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goos: darwin
goarch: arm64
pkg: github.com/ethereum/go-ethereum/rlp
cpu: Apple M4
        │   old.txt   │               new.txt               │
        │   sec/op    │   sec/op     vs base                │
Intsize   2.175n ± 5%   1.050n ± 4%  -51.76% (p=0.000 n=10)
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cui 2025-08-13 18:00:54 +08:00 committed by GitHub
parent a4d3fb9805
commit f054befc55
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1 changed files with 4 additions and 4 deletions
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8
rlp/encode.go
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@ -21,6 +21,7 @@ import (
"fmt"
"io"
"math/big"
"math/bits"
"reflect"
"github.com/ethereum/go-ethereum/rlp/internal/rlpstruct"
@ -487,9 +488,8 @@ func putint(b []byte, i uint64) (size int) {
// intsize computes the minimum number of bytes required to store i.
func intsize(i uint64) (size int) {
for size = 1; ; size++ {
if i >>= 8; i == 0 {
return size
}
if i == 0 {
return 1
}
return (bits.Len64(i) + 7) / 8
}