Improve ascii check

Author: weltling

win32/codepage.c

@@ -105,6 +105,7 @@ PW32CP wchar_t *php_win32_cp_conv_ascii_to_w(const char* in, size_t in_len, size
 {/*{{{*/
 	wchar_t *ret, *ret_idx;
 	const char *idx = in, *end;
+	char ch_err = 0;
 
 	assert(in && in_len ? in[in_len] == '\0' : 1);
 
@@ -123,29 +124,33 @@ PW32CP wchar_t *php_win32_cp_conv_ascii_to_w(const char* in, size_t in_len, size
 
 		/* Process unaligned chunk. */
 		while (idx < aidx) {
-			if (!__isascii(*idx) && '\0' != *idx) {
-				ASCII_FAIL_RETURN()
-			}
+			ch_err |= *idx;
 			idx++;
 		}
+		if (ch_err & 0x80) {
+			ASCII_FAIL_RETURN()
+		}
 
 		/* Process aligned chunk. */
+		__m128i vec_err = _mm_setzero_si128();
 		while (end - idx > 15) {
 			const __m128i block = _mm_load_si128((__m128i *)idx);
-			if (_mm_movemask_epi8(block)) {
-				ASCII_FAIL_RETURN()
-			}
+			vec_err = _mm_or_si128(vec_err, block);
 			idx += 16;
 		}
+		if (_mm_movemask_epi8(vec_err)) {
+			ASCII_FAIL_RETURN()
+		}
 	}
 
 	/* Process the trailing part, or otherwise process string < 16 bytes. */
 	while (idx < end) {
-		if (!__isascii(*idx) && '\0' != *idx) {
-			ASCII_FAIL_RETURN()
-		}
+		ch_err |= *idx;
 		idx++;
 	}
+	if (ch_err & 0x80) {
+		ASCII_FAIL_RETURN()
+	}
 
 	ret = malloc((in_len+1)*sizeof(wchar_t));
 	if (!ret) {
@@ -156,9 +161,6 @@ PW32CP wchar_t *php_win32_cp_conv_ascii_to_w(const char* in, size_t in_len, size
 	ret_idx = ret;
 	idx = in;
 
-	/* Check and conversion could be merged. This however would
-		be more expencive, if a non ASCII string was passed.
-		TODO check whether the impact is acceptable. */
 	if (in_len > 15) {
 		const char *aidx = (const char *)ZEND_SLIDE_TO_ALIGNED16(in);