Optimization for String#* for 1-byte strings

d1bc7cae · Tomasz Dabrowski · ac9d04f4 · d1bc7cae
Commit d1bc7cae authored Feb 10, 2017 by Tomasz Dabrowski
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src/string.c src/string.c +3 -1

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--- a/src/string.c
+++ b/src/string.c
@@ -870,7 +870,9 @@ mrb_str_times(mrb_state *mrb, mrb_value self)
  str2 = str_new(mrb, 0, len);
  str_with_class(mrb, str2, self);
  p = RSTR_PTR(str2);
-  if (len > 0) {
+  if (len == 1) {
+    memset(p, RSTRING_PTR(self)[0], len);
+  } else if (len > 0) {
    n = RSTRING_LEN(self);
    memcpy(p, RSTRING_PTR(self), n);
    while (n <= len/2) {