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Peformance improvement by removing tolower function call

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yhirose 2024-09-05 12:09:38 -04:00
parent 4fc0303bda
commit b4989130da
1 changed files with 48 additions and 9 deletions
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55
httplib.h
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@ -321,16 +321,53 @@ make_unique(std::size_t n) {
return std::unique_ptr<T>(new RT[n]);
}
struct ci {
inline unsigned char to_lower(int c) {
const static unsigned char table[256] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44,
45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
60, 61, 62, 63, 64, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106,
107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
122, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164,
165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 224, 225, 226,
227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241,
242, 243, 244, 245, 246, 215, 248, 249, 250, 251, 252, 253, 254, 223, 224,
225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254,
255,
};
assert(0 <= c && c < 256);
return table[c];
}
struct case_ignore_equal {
bool operator()(const std::string &s1, const std::string &s2) const {
return std::lexicographical_compare(s1.begin(), s1.end(), s2.begin(),
s2.end(),
[](unsigned char c1, unsigned char c2) {
return ::tolower(c1) < ::tolower(c2);
return s1.size() == s2.size() &&
std::equal(s1.begin(), s1.end(), s2.begin(), [](char a, char b) {
return to_lower(a) == to_lower(b);
});
}
};
struct case_ignore_hash {
constexpr size_t operator()(std::string_view key) const {
return hash_core(key.data(), key.size(), 0);
}
constexpr size_t hash_core(const char *s, size_t l, size_t h) const {
return (l == 0)
? h
: hash_core(s + 1, l - 1,
(h * 33) ^ static_cast<unsigned char>(to_lower(*s)));
}
};
// This is based on
// "http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4189".
@ -436,7 +473,9 @@ enum StatusCode {
NetworkAuthenticationRequired_511 = 511,
};
using Headers = std::multimap<std::string, std::string, detail::ci>;
using Headers =
std::unordered_multimap<std::string, std::string, detail::case_ignore_hash,
detail::case_ignore_equal>;
using Params = std::multimap<std::string, std::string>;
using Match = std::smatch;
@ -4007,7 +4046,7 @@ inline const char *get_header_value(const Headers &headers,
inline bool compare_case_ignore(const std::string &a, const std::string &b) {
if (a.size() != b.size()) { return false; }
for (size_t i = 0; i < b.size(); i++) {
if (::tolower(a[i]) != ::tolower(b[i])) { return false; }
if (to_lower(a[i]) != to_lower(b[i])) { return false; }
}
return true;
}
@ -4822,7 +4861,7 @@ private:
const std::string &b) const {
if (a.size() < b.size()) { return false; }
for (size_t i = 0; i < b.size(); i++) {
if (::tolower(a[i]) != ::tolower(b[i])) { return false; }
if (to_lower(a[i]) != to_lower(b[i])) { return false; }
}
return true;
}