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bench_parse_int.cpp
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bench_parse_int.cpp
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#include <array>
#include <benchmark/benchmark.h>
#include <cstring>
int16_t parse_int_base(const char *&it) {
bool negative = (*it == '-');
int16_t value = 0;
while (*it != '\n') {
if (*it != '.') {
value *= 10;
value += *it - '0';
}
++it;
}
++it;
if (negative)
return -value;
return value;
}
consteval auto int_parse_table() {
std::array<std::array<int16_t, 2>, 256> data;
for (size_t c = 0; c < 256; ++c) {
if (c >= '0' && c <= '9') {
data[c][0] = c - '0';
data[c][1] = 10;
} else {
data[c][0] = 0;
data[c][1] = 1;
}
}
return data;
}
static constexpr auto params = int_parse_table();
int16_t parse_int_table(const char *&iter) {
char sign = *iter;
int16_t result = 0;
while (*iter != '\n') {
result *= params[*iter][1];
result += params[*iter][0];
++iter;
}
++iter;
if (sign == '-')
return result * -1;
return result;
}
const char *test_data =
"33.3\n9.9\n8.5\n15.4\n28.3\n19.3\n22.4\n2.6\n0.7\n48.2\n9.9\n9.3\n13."
"6\n40.9\n30.3\n43.0\n24.3\n22.0\n27.1\n13.8\n12.1\n26.0\n37.7\n19.2\n22."
"0\n36.4\n26.4\n10.9\n27.6\n20.3\n9.7\n24.9\n5.6\n37.4\n11.7\n20.1\n17."
"6\n28.9\n7.3\n16.7\n-10.3\n18.9\n38.0\n37.5\n19.5\n25.2\n11.3\n17.1\n9."
"4\n8.7\n26.0\n4.8\n9.2\n24.7\n5.0\n6.4\n9.8\n2.2\n38.9\n5.9\n21.9\n22.6\n-"
"5.5\n29.4\n16.8\n8.9\n2.1\n37.8\n15.3\n10.7\n28.9\n-11.2\n19.4\n35.5\n12."
"4\n7.0\n20.5\n32.9\n37.8\n27.8\n14.9\n24.2\n42.1\n32.3\n42.9\n18.0\n3."
"0\n2.6\n-7.8\n2.3\n22.8\n20.1\n14.9\n14.7\n3.7\n34.9\n19.7\n26.1\n8.2\n-5."
"4\n18.4\n4.3\n-4.3\n33.5\n1.5\n-29.3\n10.3\n6.5\n27.4\n21.5\n15.6\n30."
"5\n11.1\n11.6\n14.4\n39.1\n22.8\n16.3\n-1.4\n33.1\n9.1\n20.6\n44.8\n5."
"6\n11.3\n21.2\n11.8\n24.5\n4.2\n12.5\n16.6\n38.8\n35.1\n9.9\n20.2\n26."
"3\n33.6\n11.6\n-0.8\n18.4\n10.1\n18.1\n13.8\n11.1\n34.1\n4.6\n9.7\n7."
"0\n16.8\n34.2\n25.3\n20.1\n6.4\n1.9\n30.3\n7.1\n24.1\n11.3\n17.4\n33.8\n5."
"2\n8.5\n31.2\n23.9\n11.4\n32.5\n12.4\n10.4\n17.9\n26.3\n16.7\n9.5\n18."
"9\n39.3\n15.2\n8.9\n36.2\n-0.7\n11.6\n11.4\n21.7\n-10.9\n20.4\n-17.1\n30."
"0\n31.4\n13.7\n5.9\n3.3\n14.8\n-1.3\n33.5\n48.6\n14.2\n-0.4\n9.6\n29."
"9\n13.5\n25.8\n15.3\n";
static void BM_parse_int_base(benchmark::State &state) {
const char *end = test_data + strlen(test_data);
for (auto _ : state) {
const char *iter = test_data;
while (iter != end) {
int16_t value = parse_int_base(iter);
benchmark::DoNotOptimize(value);
}
}
}
BENCHMARK(BM_parse_int_base);
static void BM_parse_int_base_copy1(benchmark::State &state) {
const char *end = test_data + strlen(test_data);
for (auto _ : state) {
const char *iter = test_data;
while (iter != end) {
int16_t value = parse_int_base(iter);
benchmark::DoNotOptimize(value);
}
}
}
BENCHMARK(BM_parse_int_base_copy1);
static void BM_parse_int_base_copy2(benchmark::State &state) {
const char *end = test_data + strlen(test_data);
for (auto _ : state) {
const char *iter = test_data;
while (iter != end) {
int16_t value = parse_int_base(iter);
benchmark::DoNotOptimize(value);
}
}
}
BENCHMARK(BM_parse_int_base_copy2);
static void BM_parse_int_table(benchmark::State &state) {
const char *end = test_data + strlen(test_data);
for (auto _ : state) {
const char *iter = test_data;
while (iter != end) {
int16_t value = parse_int_table(iter);
benchmark::DoNotOptimize(value);
}
}
}
BENCHMARK(BM_parse_int_table);
static void BM_parse_int_table_copy1(benchmark::State &state) {
const char *end = test_data + strlen(test_data);
for (auto _ : state) {
const char *iter = test_data;
while (iter != end) {
int16_t value = parse_int_table(iter);
benchmark::DoNotOptimize(value);
}
}
}
BENCHMARK(BM_parse_int_table_copy1);
static void BM_parse_int_table_copy2(benchmark::State &state) {
const char *end = test_data + strlen(test_data);
for (auto _ : state) {
const char *iter = test_data;
while (iter != end) {
int16_t value = parse_int_table(iter);
benchmark::DoNotOptimize(value);
}
}
}
BENCHMARK(BM_parse_int_table_copy2);
static void BM_noop(benchmark::State &state) {
for (auto _ : state) {
}
}
BENCHMARK(BM_noop);
BENCHMARK_MAIN();