Merge branch 'PHP-7.4'

Author: nikic

Zend/README.ZEND_MM

@@ -25,13 +25,3 @@ Since PHP 5.3.11 it is possible to prevent shared extensions from unloading so
 that valgrind can correctly track the memory leaks in shared extensions. For
 this there is the ZEND_DONT_UNLOAD_MODULES environment variable. If set, then
 DL_UNLOAD() is skipped during the shutdown of shared extensions.
-
-
-Tweaking:
----------
-
-The Zend MM can be tweaked using ZEND_MM_MEM_TYPE and ZEND_MM_SEG_SIZE environment
-variables.  Default values are "malloc" and "256K". Dependent on target system you
-can also use "mmap_anon", "mmap_zero" and "win32" storage managers.
-
-	$ ZEND_MM_MEM_TYPE=mmap_anon ZEND_MM_SEG_SIZE=1M sapi/cli/php ..etc.

ext/standard/string.c

@@ -3376,6 +3376,8 @@ PHP_FUNCTION(strtr)
    Reverse a string */
 #if ZEND_INTRIN_SSSE3_NATIVE
 #include <tmmintrin.h>
+#elif defined(__aarch64__)
+#include <arm_neon.h>
 #endif
 PHP_FUNCTION(strrev)
 {
@@ -3408,6 +3410,19 @@ PHP_FUNCTION(strrev)
 			e -= 16;
 		} while (e - s > 15);
 	}
+#elif defined(__aarch64__)
+	if (e - s > 15) {
+		do {
+			const uint8x16_t str = vld1q_u8((uint8_t *)(e - 15));
+			/* Synthesize rev128 with a rev64 + ext. */
+			const uint8x16_t rev = vrev64q_u8(str);
+			const uint8x16_t ext = (uint8x16_t)
+				vextq_u64((uint64x2_t)rev, (uint64x2_t)rev, 1);
+			vst1q_u8((uint8_t *)p, ext);
+			p += 16;
+			e -= 16;
+		} while (e - s > 15);
+	}
 #endif
 	while (e >= s) {
 		*p++ = *e--;