Add simple bech32 benchmarks

src/Makefile.bench.include

@@ -26,6 +26,7 @@ bench_bench_bitcoin_SOURCES = \
   bench/mempool_eviction.cpp \
   bench/verify_script.cpp \
   bench/base58.cpp \
+  bench/bech32.cpp \
   bench/lockedpool.cpp \
   bench/prevector.cpp
 

src/bench/bech32.cpp

@@ -0,0 +1,38 @@
+// Copyright (c) 2018 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 <validation.h>
+#include <bech32.h>
+#include <utilstrencodings.h>
+
+#include <vector>
+#include <string>
+
+
+static void Bech32Encode(benchmark::State& state)
+{
+    std::vector<uint8_t> v = ParseHex("c97f5a67ec381b760aeaf67573bc164845ff39a3bb26a1cee401ac67243b48db");
+    std::vector<unsigned char> tmp = {0};
+    tmp.reserve(1 + 32 * 8 / 5);
+    ConvertBits<8, 5, true>([&](unsigned char c) { tmp.push_back(c); }, v.begin(), v.end());
+    while (state.KeepRunning()) {
+        bech32::Encode("bc", tmp);
+    }
+}
+
+
+static void Bech32Decode(benchmark::State& state)
+{
+    std::string addr = "bc1qkallence7tjawwvy0dwt4twc62qjgaw8f4vlhyd006d99f09";
+    std::vector<unsigned char> vch;
+    while (state.KeepRunning()) {
+        bech32::Decode(addr);
+    }
+}
+
+
+BENCHMARK(Bech32Encode, 800 * 1000);
+BENCHMARK(Bech32Decode, 800 * 1000);