pp.c: Use faster method to convert to UTF-8

There is a special inline function that's used when converting a single
byte to UTF-8, that is faster than the more general one used prior to
this commit.

1 files changed, 5 insertions, 3 deletions

diff --git a/pp.c b/pp.c
index cde8fa51f7..ecb31379f4 100644
--- a/pp.c
+++ b/pp.c
@@ -3895,9 +3895,11 @@ PP(pp_ucfirst)
 		*d++ = *(tmpbuf + 1);
 		s++;	/* We have just processed the 1st char */
 
-		for (; s < send; s++) {
-		    d = uvchr_to_utf8(d, *s);
-		}
+                while (s < send) {
+                    append_utf8_from_native_byte(*s, &d);
+                    s++;
+                }
+
 		*d = '\0';
 		SvCUR_set(dest, d - (U8*)SvPVX_const(dest));
 	    }