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Use memchr for performance
```ruby
s = "b"
str = ("a" * 100 + s)

t = Time.now
str.index(s)
puts Time.now - t
```

before => 0.000788
after  => 0.000508

---

```ruby
s = "b"
str = ("a" * 100 * 1024 * 1024 + s)

t = Time.now
str.index(s)
puts Time.now - t
```

before => 0.225474
after  => 0.008658
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ksss committed Dec 31, 2015
1 parent d3c6faf commit 6c1b6ef7a5d849ccfcb8cbd163443f983f264857
Showing 1 changed file with 6 additions and 6 deletions.
@@ -352,12 +352,12 @@ mrb_memsearch(const void *x0, mrb_int m, const void *y0, mrb_int n)
return 0;
}
else if (m == 1) {
const unsigned char *ys = y, *ye = ys + n;
for (; y < ye; ++y) {
if (*x == *y)
return y - ys;
}
return -1;
const unsigned char *ys = memchr(y, *x, n);

if (ys)
return ys - y;
else
return -1;
}
return mrb_memsearch_qs((const unsigned char *)x0, m, (const unsigned char *)y0, n);
}

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