rlp: minor optimizations for slice/array encoding #23467
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This makes it possible to inline the function, and the length is known at encoder construction time.
It's actually cheaper to use Elem first, because it performs less checks on the value. If the pointer was nil, the result of Elem is 'invalid'.
For empty slices/arrays, we can avoid storing a list header entry in the encoder buffer. Also avoid doing the tail check at encoding time because it is already known at encoder construction time.
sidhujag
pushed a commit
to sidhujag/go-ethereum
that referenced
this pull request
Aug 25, 2021
As per benchmark results below, these changes speed up encoding/decoding of
consensus objects a bit.
name old time/op new time/op delta
EncodeRLP/legacy-header-8 384ns ± 1% 331ns ± 3% -13.83% (p=0.000 n=7+8)
EncodeRLP/london-header-8 411ns ± 1% 359ns ± 2% -12.53% (p=0.000 n=8+8)
EncodeRLP/receipt-for-storage-8 251ns ± 0% 239ns ± 0% -4.97% (p=0.000 n=8+8)
EncodeRLP/receipt-full-8 319ns ± 0% 300ns ± 0% -5.89% (p=0.000 n=8+7)
EncodeRLP/legacy-transaction-8 389ns ± 1% 387ns ± 1% ~ (p=0.099 n=8+8)
EncodeRLP/access-transaction-8 607ns ± 0% 581ns ± 0% -4.26% (p=0.000 n=8+8)
EncodeRLP/1559-transaction-8 627ns ± 0% 606ns ± 1% -3.44% (p=0.000 n=8+8)
DecodeRLP/legacy-header-8 831ns ± 1% 813ns ± 1% -2.20% (p=0.000 n=8+8)
DecodeRLP/london-header-8 824ns ± 0% 804ns ± 1% -2.44% (p=0.000 n=8+7)
* rlp: pass length to byteArrayBytes
This makes it possible to inline byteArrayBytes. For arrays, the length is known
at encoder construction time, so the call to v.Len() can be avoided.
* rlp: avoid IsNil for pointer encoding
It's actually cheaper to use Elem first, because it performs less checks
on the value. If the pointer was nil, the result of Elem is 'invalid'.
* rlp: minor optimizations for slice/array encoding
For empty slices/arrays, we can avoid storing a list header entry in the
encoder buffer. Also avoid doing the tail check at encoding time because
it is already known at encoder construction time.
yongjun925
pushed a commit
to DODOEX/go-ethereum
that referenced
this pull request
Dec 3, 2022
As per benchmark results below, these changes speed up encoding/decoding of
consensus objects a bit.
name old time/op new time/op delta
EncodeRLP/legacy-header-8 384ns ± 1% 331ns ± 3% -13.83% (p=0.000 n=7+8)
EncodeRLP/london-header-8 411ns ± 1% 359ns ± 2% -12.53% (p=0.000 n=8+8)
EncodeRLP/receipt-for-storage-8 251ns ± 0% 239ns ± 0% -4.97% (p=0.000 n=8+8)
EncodeRLP/receipt-full-8 319ns ± 0% 300ns ± 0% -5.89% (p=0.000 n=8+7)
EncodeRLP/legacy-transaction-8 389ns ± 1% 387ns ± 1% ~ (p=0.099 n=8+8)
EncodeRLP/access-transaction-8 607ns ± 0% 581ns ± 0% -4.26% (p=0.000 n=8+8)
EncodeRLP/1559-transaction-8 627ns ± 0% 606ns ± 1% -3.44% (p=0.000 n=8+8)
DecodeRLP/legacy-header-8 831ns ± 1% 813ns ± 1% -2.20% (p=0.000 n=8+8)
DecodeRLP/london-header-8 824ns ± 0% 804ns ± 1% -2.44% (p=0.000 n=8+7)
* rlp: pass length to byteArrayBytes
This makes it possible to inline byteArrayBytes. For arrays, the length is known
at encoder construction time, so the call to v.Len() can be avoided.
* rlp: avoid IsNil for pointer encoding
It's actually cheaper to use Elem first, because it performs less checks
on the value. If the pointer was nil, the result of Elem is 'invalid'.
* rlp: minor optimizations for slice/array encoding
For empty slices/arrays, we can avoid storing a list header entry in the
encoder buffer. Also avoid doing the tail check at encoding time because
it is already known at encoder construction time.
nibty
pushed a commit
to FairCrypto/go-ethereum
that referenced
this pull request
Apr 10, 2024
As per benchmark results below, these changes speed up encoding/decoding of
consensus objects a bit.
name old time/op new time/op delta
EncodeRLP/legacy-header-8 384ns ± 1% 331ns ± 3% -13.83% (p=0.000 n=7+8)
EncodeRLP/london-header-8 411ns ± 1% 359ns ± 2% -12.53% (p=0.000 n=8+8)
EncodeRLP/receipt-for-storage-8 251ns ± 0% 239ns ± 0% -4.97% (p=0.000 n=8+8)
EncodeRLP/receipt-full-8 319ns ± 0% 300ns ± 0% -5.89% (p=0.000 n=8+7)
EncodeRLP/legacy-transaction-8 389ns ± 1% 387ns ± 1% ~ (p=0.099 n=8+8)
EncodeRLP/access-transaction-8 607ns ± 0% 581ns ± 0% -4.26% (p=0.000 n=8+8)
EncodeRLP/1559-transaction-8 627ns ± 0% 606ns ± 1% -3.44% (p=0.000 n=8+8)
DecodeRLP/legacy-header-8 831ns ± 1% 813ns ± 1% -2.20% (p=0.000 n=8+8)
DecodeRLP/london-header-8 824ns ± 0% 804ns ± 1% -2.44% (p=0.000 n=8+7)
* rlp: pass length to byteArrayBytes
This makes it possible to inline byteArrayBytes. For arrays, the length is known
at encoder construction time, so the call to v.Len() can be avoided.
* rlp: avoid IsNil for pointer encoding
It's actually cheaper to use Elem first, because it performs less checks
on the value. If the pointer was nil, the result of Elem is 'invalid'.
* rlp: minor optimizations for slice/array encoding
For empty slices/arrays, we can avoid storing a list header entry in the
encoder buffer. Also avoid doing the tail check at encoding time because
it is already known at encoder construction time.
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As per benchmark results below, these changes speed up encoding/decoding of consensus objects a bit.
I created these changes before starting work on the code generator. Mostly submitting because it took non-trivial effort to find these optimizations, so I feel like the changes are valuable even if we end up not using the reflect-based encoder/decoder later.