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~50% speedup by fast-pathing Eth2Digest merkle hashing

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This commit is contained in:
Dustin Brody 2019-11-26 15:32:45 +01:00
parent 843c461af6
commit bde20436e8
2 changed files with 9 additions and 4 deletions
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4
beacon_chain/spec/beaconstate.nim
View File

@ -258,8 +258,8 @@ func is_valid_genesis_state*(state: BeaconState): bool =
return false
return true
# TODO candidate for spec?
# https://github.com/ethereum/eth2.0-specs/blob/0.5.1/specs/core/0_beacon-chain.md#on-genesis
# TODO this is now a non-spec helper function, and it's not really accurate
# so only usable/used in research/ and tests/
func get_initial_beacon_block*(state: BeaconState): BeaconBlock =
BeaconBlock(
slot: GENESIS_SLOT,

9
beacon_chain/ssz.nim
View File

@ -139,7 +139,7 @@ func writeFixedSized(c: var WriteCursor, x: auto) =
c.append x
else:
for elem in x:
trs "WRITING FIXED SIZE ARRAY ELEMENENT"
trs "WRITING FIXED SIZE ARRAY ELEMENT"
c.writeFixedSized toSszType(elem)
elif x is tuple|object:
enumInstanceSerializedFields(x, fieldName, field):
@ -508,7 +508,12 @@ func bitlistHashTreeRoot(merkelizer: SszChunksMerkelizer, x: BitSeq): Eth2Digest
mixInLength contentsHash, x.len
func hashTreeRootImpl[T](x: T): Eth2Digest =
when (T is BasicType) or (when T is array: ElemType(T) is BasicType else: false):
when (when T is array: ElemType(T) is byte and
sizeof(T) == sizeof(Eth2Digest) else: false):
# TODO is this sizeof comparison guranteed? it's whole structure vs field
trs "ETH2DIGEST; IDENTITY MAPPING"
Eth2Digest(data: x)
elif (T is BasicType) or (when T is array: ElemType(T) is BasicType else: false):
trs "FIXED TYPE; USE CHUNK STREAM"
merkelizeSerializedChunks x
elif T is string or (when T is (seq|openarray): ElemType(T) is BasicType else: false):