From: Xinchen Hui <laruence@gmail.com>
Date: Sun, 18 Feb 2018 11:34:48 +0000 (+0800)
Subject: Move map out of loop
X-Git-Tag: php-7.3.0alpha1~371
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ac5cdd46f31be8b461d5d5aefa929f20fb646770;p=php

Move map out of loop
---

diff --git a/ext/standard/string.c b/ext/standard/string.c
index 2a79378c4b..fce878358a 100644
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -3531,17 +3531,19 @@ PHP_FUNCTION(strrev)
 	e = s + ZSTR_LEN(str);
 	--e;
 #if ZEND_INTRIN_SSSE3_NATIVE
-	while (e - s > 15) {
+	do {
 		const __m128i map = _mm_set_epi8(
 				0, 1, 2, 3,
 				4, 5, 6, 7,
 				8, 9, 10, 11,
 				12, 13, 14, 15);
-		const __m128i str = _mm_loadu_si128((__m128i *)(e - 15));
-		_mm_storeu_si128((__m128i *)p, _mm_shuffle_epi8(str, map));
-		p += 16;
-		e -= 16;
-	}
+		while (e - s > 15) {
+			const __m128i str = _mm_loadu_si128((__m128i *)(e - 15));
+			_mm_storeu_si128((__m128i *)p, _mm_shuffle_epi8(str, map));
+			p += 16;
+			e -= 16;
+		}
+	} while(0);
 #endif
 	while (e >= s) {
 		*p++ = *e--;