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[core] http_header_hkey_get() perf (better asm)

This commit is contained in:
Glenn Strauss 2021-05-25 05:04:36 -04:00
parent fbefda3524
commit f8bd028dc0
2 changed files with 34 additions and 18 deletions
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48
src/http_header.c
View File

@ -94,25 +94,41 @@ static const keyvlenvalue http_headers[] = {
,{ HTTP_HEADER_OTHER, 0, "" }
};
enum http_header_e http_header_hkey_get(const char * const s, const uint32_t slen) {
const struct keyvlenvalue * const kv = http_headers;
int i = slen < sizeof(http_headers_off) ? http_headers_off[slen] : -1;
if (i < 0) return HTTP_HEADER_OTHER;
do {
if (buffer_eq_icase_ssn(s, kv[i].value, slen))
return (enum http_header_e)kv[i].key;
} while (slen == kv[++i].vlen);
enum http_header_e http_header_hkey_get(const char * const s, const size_t slen) {
if (__builtin_expect( (slen < sizeof(http_headers_off)), 1)) {
const int i = http_headers_off[slen];
/*(lowercase first char as all recognized headers start w/ alpha char)*/
const int c = s[0] | 0x20;
const struct keyvlenvalue * restrict kv = http_headers + i;
if (__builtin_expect( (i != -1), 1)) {
do {
if (__builtin_expect( (c != kv->value[0]), 1))
continue;
if (buffer_eq_icase_ssn(s+1, kv->value+1, slen-1))
return (enum http_header_e)kv->key;
} while (slen == (++kv)->vlen);
}
}
return HTTP_HEADER_OTHER;
}
enum http_header_e http_header_hkey_get_lc(const char * const s, const uint32_t slen) {
const struct keyvlenvalue * const kv = http_headers;
int i = slen < sizeof(http_headers_off) ? http_headers_off[slen] : -1;
if (i < 0) return HTTP_HEADER_OTHER;
do {
if (0 == memcmp(s, kv[i].value, slen))
return (enum http_header_e)kv[i].key;
} while (slen == kv[++i].vlen);
enum http_header_e http_header_hkey_get_lc(const char * const s, const size_t slen) {
/* XXX: might not provide much real performance over http_header_hkey_get()
* (since the first-char comparision optimization was added)
* (and since well-known h2 headers are already mapped to hkey) */
if (__builtin_expect( (slen < sizeof(http_headers_off)), 1)) {
const int i = http_headers_off[slen];
const int c = s[0];
const struct keyvlenvalue * restrict kv = http_headers + i;
if (__builtin_expect( (i != -1), 1)) {
do {
if (__builtin_expect( (c != kv->value[0]), 1))
continue;
if (0 == memcmp(s+1, kv->value+1, slen-1))
return (enum http_header_e)kv->key;
} while (slen == (++kv)->vlen);
}
}
return HTTP_HEADER_OTHER;
}

4
src/http_header.h
View File

@ -88,9 +88,9 @@ enum http_header_e {
};
__attribute_pure__
enum http_header_e http_header_hkey_get(const char *s, uint32_t slen);
enum http_header_e http_header_hkey_get(const char *s, size_t slen);
__attribute_pure__
enum http_header_e http_header_hkey_get_lc(const char *s, uint32_t slen);
enum http_header_e http_header_hkey_get_lc(const char *s, size_t slen);
__attribute_pure__
int http_header_str_to_code (const char * const s);