Index: sys/arm64/include/endian.h
===================================================================
--- sys/arm64/include/endian.h
+++ sys/arm64/include/endian.h
@@ -60,34 +60,34 @@
 #define	__htons(x)        (__bswap16(x))
 
 static __inline __uint64_t
-__bswap64(__uint64_t x)
+__bswap64(__uint64_t _x)
 {
 	__uint64_t ret;
 
 	__asm __volatile("rev %0, %1\n"
-			 : "=&r" (ret), "+r" (x));
+			 : "=r" (ret) : "r" (_x));
 
 	return (ret);
 }
 
 static __inline __uint32_t
-__bswap32_var(__uint32_t v)
+__bswap32_var(__uint32_t _x)
 {
 	__uint32_t ret;
 
 	__asm __volatile("rev32 %x0, %x1\n"
-			 : "=&r" (ret), "+r" (v));
+			 : "=r" (ret) : "r" (_x));
 
 	return (ret);
 }
 
 static __inline __uint16_t
-__bswap16_var(__uint16_t v)
+__bswap16_var(__uint16_t _x)
 {
 	__uint32_t ret;
 
 	__asm __volatile("rev16 %w0, %w1\n"
-			 : "=&r" (ret), "+r" (v));
+			 : "=r" (ret) : "r" (_x));
 
 	return ((__uint16_t)ret);
 }