Looks like (in some very EVM specific tests) we spent a lot of time
resizing memory. If the underlying array is big enough, we can speed it
up a bit by simply slicing the memory.
goos: linux
goarch: amd64
pkg: github.com/ethereum/go-ethereum/core/vm
cpu: Intel(R) Core(TM) Ultra 7 155U
│ /tmp/old.txt │ /tmp/new.txt │
│ sec/op │ sec/op vs base │
Resize-14 6.145n ± 9% 1.854n ± 14% -69.83% (p=0.000 n=10)
│ /tmp/old.txt │ /tmp/new.txt │
│ B/op │ B/op vs base │
Resize-14 5.000 ± 0% 5.000 ± 0% ~ (p=1.000 n=10)
│ /tmp/old.txt │ /tmp/new.txt │
│ allocs/op │ allocs/op vs base │
Resize-14 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=10) ¹
From the blocktest benchmark:
620ms 10.93s (flat, cum) 9.92% of Total
. . 80:func (m *Memory) Resize(size uint64) {
30ms 60ms 81: if uint64(m.Len()) < size {
590ms 10.87s 82: m.store = append(m.store, make([]byte, size-uint64(m.Len()))...)
. . 83: }
. . 84:}
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Co-authored-by: Felix Lange <fjl@twurst.com>
Implements [EIP 5656](https://eips.ethereum.org/EIPS/eip-5656), MCOPY instruction, and enables it for Cancun.
---------
Co-authored-by: Martin Holst Swende <martin@swende.se>
