From 4b915af2c3a0097eac87b06915605f90cc8d14c6 Mon Sep 17 00:00:00 2001
From: CPerezz <37264926+CPerezz@users.noreply.github.com>
Date: Tue, 17 Mar 2026 11:42:42 +0100
Subject: [PATCH] core/state: avoid Bytes() allocation in flatReader hash
 computations (#34025)

## Summary

Replace `addr.Bytes()` and `key.Bytes()` with `addr[:]` and `key[:]` in
`flatReader`'s `Account` and `Storage` methods. The former allocates a
copy while the latter creates a zero-allocation slice header over the
existing backing array.

## Benchmark (AMD EPYC 48-core, 500K entries, screening
`--benchtime=1x`)

| Metric | Baseline | Slice syntax | Delta |
|--------|----------|--------------|-------|
| Approve (Mgas/s) | 4.13 | 4.22 | +2.2% |
| BalanceOf (Mgas/s) | 168.3 | 190.0 | **+12.9%** |
---
 core/state/reader.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/core/state/reader.go b/core/state/reader.go
index 49375c467c..fe0ec71f2d 100644
--- a/core/state/reader.go
+++ b/core/state/reader.go
@@ -98,7 +98,7 @@ func newFlatReader(reader database.StateReader) *flatReader {
 //
 // The returned account might be nil if it's not existent.
 func (r *flatReader) Account(addr common.Address) (*types.StateAccount, error) {
-	account, err := r.reader.Account(crypto.Keccak256Hash(addr.Bytes()))
+	account, err := r.reader.Account(crypto.Keccak256Hash(addr[:]))
 	if err != nil {
 		return nil, err
 	}
@@ -128,8 +128,8 @@ func (r *flatReader) Account(addr common.Address) (*types.StateAccount, error) {
 //
 // The returned storage slot might be empty if it's not existent.
 func (r *flatReader) Storage(addr common.Address, key common.Hash) (common.Hash, error) {
-	addrHash := crypto.Keccak256Hash(addr.Bytes())
-	slotHash := crypto.Keccak256Hash(key.Bytes())
+	addrHash := crypto.Keccak256Hash(addr[:])
+	slotHash := crypto.Keccak256Hash(key[:])
 	ret, err := r.reader.Storage(addrHash, slotHash)
 	if err != nil {
 		return common.Hash{}, err