On Wednesday 22 August 2007, lode leroy wrote:
> While profiling something completely unrelated, I noticed
> that on the workloads I used memchr for, I saw a 30%-40% improvement
> in performance, with the following trivial changes...
> (basically, it saves 3 operations for each call)
Yes, but then you could be a bit more explicit to the compiler
on what you are doing here:
void *memchr(const void *s, int c, size_t n)
{
const unsigned char *p = s;
for (; n != 0; n--, p++) {
if ((unsigned char)c == *p) {
return (void *)p;
}
return NULL;
}
Now the compiler should see the loop more clearly.
Best Regards
Ingo Oeser
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