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avcodec/xbmenc: Pre-compute variables once for parse_str_int()

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Some compilers are very intuitive, and others are not so much, so let's
pre-compute the variables e and keylen outside the for loop. Ensuring a
minor speed increase regardless of if compiler is smart enough to solve
this improvement for itself, or not.

Signed-off-by: Joe Da Silva <digital@joescat.com>
This commit is contained in:
Jose Da Silva 2021-01-31 19:50:57 -08:00 committed by Paul B Mahol
parent b6bc981d25
commit 42c636c972
1 changed files with 6 additions and 3 deletions
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9
libavcodec/xbmdec.c
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@ -39,11 +39,14 @@ static int convert(uint8_t x)
static int parse_str_int(const uint8_t *p, const uint8_t *end, const uint8_t *key)
{
for(; p<end - strlen(key); p++) {
if (!memcmp(p, key, strlen(key)))
int keylen = strlen(key);
const uint8_t *e = end - keylen;
for(; p < e; p++) {
if (!memcmp(p, key, keylen))
break;
}
p += strlen(key);
p += keylen;
if (p >= end)
return INT_MIN;