pp.c: Add compiler hint

Almost always the input to uc() will be one of the other 253 Latin1
characters rather than one of the three that gets here.

diff --git a/pp.c b/pp.c
index 5707ced..12e69e4 100644 (file)
--- a/pp.c
+++ b/pp.c
@@ -3953,7 +3953,7 @@ PP(pp_uc)
            else {
                for (; s < send; d++, s++) {
                    *d = toUPPER_LATIN1_MOD(*s);
-                   if (*d != LATIN_SMALL_LETTER_Y_WITH_DIAERESIS) continue;
+                   if (LIKELY(*d != LATIN_SMALL_LETTER_Y_WITH_DIAERESIS)) continue;
 
                    /* The mainstream case is the tight loop above.  To avoid
                     * extra tests in that, all three characters that require