parse_hex.cpp

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// Copyright (c) 2024-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <bench/bench.h>
#include <random.h>
#include <util/strencodings.h>

#include <cassert>
#include <cstddef>
#include <optional>
#include <vector>

std::string generateHexString(size_t length) {
    const auto hex_digits = "0123456789ABCDEF";
    FastRandomContext rng(/*fDeterministic=*/true);

    std::string data;
    while (data.size() < length) {
        auto digit = hex_digits[rng.randbits(4)];
        data.push_back(digit);
    }
    return data;
}

static void HexParse(benchmark::Bench& bench)
{
    auto data = generateHexString(130); // Generates 678B0EDA0A1FD30904D5A65E3568DB82DB2D918B0AD8DEA18A63FECCB877D07CAD1495C7157584D877420EF38B8DA473A6348B4F51811AC13C786B962BEE5668F9 by default

    bench.batch(data.size()).unit("base16").run([&] {
        auto result = TryParseHex(data);
        assert(result != std::nullopt); // make sure we're measuring the successful case
        ankerl::nanobench::doNotOptimizeAway(result);
    });
}

BENCHMARK(HexParse);