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faster `hash` for `Address` (#688)

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Jacek Sieka 2024-06-05 22:46:23 +02:00 committed by GitHub
parent 0e83cfda97
commit 68bd675b75
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1 changed files with 18 additions and 1 deletions
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19
eth/common/eth_types.nim
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@ -10,7 +10,7 @@
## from many places ## from many places
import import
std/[options, strutils], std/[options, hashes, strutils],
stew/[byteutils, endians2], stint, stew/[byteutils, endians2], stint,
./eth_hash, ./eth_times ./eth_hash, ./eth_times
@ -319,3 +319,20 @@ func `==`*(a, b: NetworkId): bool =
func `$`*(x: NetworkId): string = func `$`*(x: NetworkId): string =
`$`(uint(x)) `$`(uint(x))
func `==`*(a, b: EthAddress): bool {.inline.} =
equalMem(unsafeAddr a[0], unsafeAddr b[0], a.len)
# TODO https://github.com/nim-lang/Nim/issues/23678
func hash*(a: EthAddress): Hash {.inline.} =
static: doAssert sizeof(a) == 20
var a0{.noinit.}, a1 {.noinit.}: uint64
var a2{.noinit.}: uint32
# Addresses are more or less random so we should not need a fancy mixing
# function
copyMem(addr a0, unsafeAddr a[0], sizeof(a0))
copyMem(addr a1, unsafeAddr a[8], sizeof(a1))
copyMem(addr a2, unsafeAddr a[16], sizeof(a2))
cast[Hash](a0 xor a1 xor uint64(a2))