Revert "let ci run without max_shift trick to compare perf"

This reverts commit d7f2562.

Author: ndossche

ext/json/json_encoder.c

@@ -522,9 +522,11 @@ zend_result php_json_escape_string(
 			const __m128i input = _mm_loadu_si128((__m128i *) (s + pos));
 			const __m128i input_range = _mm_cmplt_epi8(input, _mm_set1_epi8(32));
 
+			int max_shift = 16;
+
 			int input_range_mask = _mm_movemask_epi8(input_range);
 			if (input_range_mask != 0) {
-				break;
+				max_shift = zend_ulong_ntz(input_range_mask);
 			}
 
 #ifdef ZEND_INTRIN_SSE4_2_NATIVE
@@ -551,6 +553,12 @@ zend_result php_json_escape_string(
 			int mask = _mm_movemask_epi8(result_individual_bytes);
 #endif
 			if (mask != 0) {
+				if (max_shift < 16) {
+					int shift = zend_ulong_ntz(mask); /* first offending character */
+					pos += MIN(max_shift, shift);
+					len -= MIN(max_shift, shift);
+					break;
+				}
 				int shift = zend_ulong_nlz(mask) - 16 - (SIZEOF_ZEND_LONG == 8 ? 32 : 0); /* skips over everything */
 				do {
 					/* Note that we shift the input forward, so we have to shift the mask as well,
@@ -571,6 +579,11 @@ zend_result php_json_escape_string(
 
 				pos += shift;
 			} else {
+				if (max_shift < 16) {
+					pos += max_shift;
+					len -= max_shift;
+					break;
+				}
 				pos += sizeof(__m128i);
 			}