regcomp.c: small efficiency, portability fix

The code had hard-coded into it the ascii platform values for possible
start bytes.  There are macros that do that portably with no branches

1 files changed, 3 insertions, 6 deletions

diff --git a/regcomp.c b/regcomp.c
index b5cc357dbe..17a46a8c73 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -1484,12 +1484,9 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
 
 		    if ( !UTF ) {
 			/* store first byte of utf8 representation of
-			   codepoints in the 127 < uvc < 256 range */
-			if (127 < uvc && uvc < 192) {
-			    TRIE_BITMAP_SET(trie,194);
-			} else if (191 < uvc ) {
-			    TRIE_BITMAP_SET(trie,195);
-			/* && uvc < 256 -- we know uvc is < 256 already */
+			   variant codepoints */
+			if (! UNI_IS_INVARIANT(uvc)) {
+			    TRIE_BITMAP_SET(trie, UTF8_TWO_BYTE_HI(uvc));
 			}
 		    }
                     set_bit = 0; /* We've done our bit :-) */