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even simpler bench_ip function

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Daniel Lemire 2025-12-23 20:18:26 -05:00
parent 5830594b99
commit 0b11d0a70f
1 changed files with 29 additions and 53 deletions
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82
benchmarks/bench_ip.cpp
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@ -52,61 +52,37 @@ fastfloat_really_inline const char *seek_ip_end(const char *p,
return current;
}
fastfloat_really_inline int parse_u8_fastfloat(const char *&p, const char *pend,
uint8_t *out) {
if (p == pend)
return 0;
auto r = fast_float::from_chars(p, pend, *out);
if (r.ec == std::errc()) {
p = r.ptr;
return 1;
}
return 0;
}
enum class parse_method { standard, fast_float };
fastfloat_really_inline int parse_u8_fromchars(const char *&p, const char *pend,
uint8_t *out) {
if (p == pend) {
return 0;
}
auto r = std::from_chars(p, pend, *out);
if (r.ec == std::errc()) {
p = r.ptr;
return 1;
}
return 0;
}
template <typename Parser>
template <parse_method use_standard>
fastfloat_really_inline std::pair<bool, uint32_t>
simple_parse_ip_line(const char *p, const char *pend, Parser parse_uint8) {
uint8_t v1;
if (!parse_uint8(p, pend, &v1)) {
return {false, 0};
simple_parse_ip_line(const char *p, const char *pend) {
const char *current = p;
uint32_t ip = 0;
for (int i = 0; i < 4; ++i) {
uint8_t value;
if constexpr (use_standard == parse_method::standard) {
auto r = std::from_chars(current, pend, value);
if (r.ec != std::errc()) {
return {false, 0};
}
current = r.ptr;
} else if constexpr (use_standard == parse_method::fast_float) {
auto r = fast_float::from_chars(current, pend, value);
if (r.ec != std::errc()) {
return {false, 0};
}
current = r.ptr;
}
ip = (ip << 8) | value;
if (i < 3) {
if (current == pend || *current++ != '.') {
return {false, 0};
}
}
}
if (p == pend || *p++ != '.') {
return {false, 0};
}
uint8_t v2;
if (!parse_uint8(p, pend, &v2)) {
return {false, 0};
}
if (p == pend || *p++ != '.') {
return {false, 0};
}
uint8_t v3;
if (!parse_uint8(p, pend, &v3)) {
return {false, 0};
}
if (p == pend || *p++ != '.') {
return {false, 0};
}
uint8_t v4;
if (!parse_uint8(p, pend, &v4)) {
return {false, 0};
}
return {true, (uint32_t(v1) << 24) | (uint32_t(v2) << 16) |
(uint32_t(v3) << 8) | uint32_t(v4)};
return {true, ip};
}
static std::string make_ip_line(uint8_t a, uint8_t b, uint8_t c, uint8_t d) {
@ -176,7 +152,7 @@ int main() {
int ok = 0;
for (size_t i = 0; i < N; ++i) {
auto [ok, ip] =
simple_parse_ip_line(p, pend, parse_u8_fromchars);
simple_parse_ip_line<parse_method::standard>(p, pend);
sum += ip;
if (!ok) {
std::abort();
@ -193,7 +169,7 @@ int main() {
int ok = 0;
for (size_t i = 0; i < N; ++i) {
auto [ok, ip] =
simple_parse_ip_line(p, pend, parse_u8_fastfloat);
simple_parse_ip_line<parse_method::fast_float>(p, pend);
sum += ip;
if (!ok) {
std::abort();