diff --git a/sys/dev/cx/machdep.h b/sys/dev/cx/machdep.h
index a425af5b717d..393377d0b406 100644
--- a/sys/dev/cx/machdep.h
+++ b/sys/dev/cx/machdep.h
@@ -73,7 +73,6 @@
 #   include <machine/cpufunc.h>
 #   include <sys/libkern.h>
 #   include <sys/systm.h>
-#   define memset(a,b,c)	bzero (a,c)
 #   define port_t int
 
 #ifndef _SYS_CDEFS_H_
diff --git a/sys/libkern/bcmp.c b/sys/libkern/bcmp.c
index 1832922e37b8..40ef39953c86 100644
--- a/sys/libkern/bcmp.c
+++ b/sys/libkern/bcmp.c
@@ -44,7 +44,7 @@ typedef const unsigned long	*culp;
  * bcmp -- vax cmpc3 instruction
  */
 int
-bcmp(const void *b1, const void *b2, size_t length)
+(bcmp)(const void *b1, const void *b2, size_t length)
 {
 #if BYTE_ORDER == LITTLE_ENDIAN
 	/*
diff --git a/sys/libkern/memcmp.c b/sys/libkern/memcmp.c
index e2f17906823e..127cf6df1106 100644
--- a/sys/libkern/memcmp.c
+++ b/sys/libkern/memcmp.c
@@ -41,7 +41,7 @@ __FBSDID("$FreeBSD$");
  * Compare memory regions.
  */
 int
-memcmp(const void *s1, const void *s2, size_t n)
+(memcmp)(const void *s1, const void *s2, size_t n)
 {
 	if (n != 0) {
 		const unsigned char *p1 = s1, *p2 = s2;
diff --git a/sys/libkern/memset.c b/sys/libkern/memset.c
index b2d64b21b90e..431011a34500 100644
--- a/sys/libkern/memset.c
+++ b/sys/libkern/memset.c
@@ -33,7 +33,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/libkern.h>
 
 void *
-memset(void *b, int c, size_t len)
+(memset)(void *b, int c, size_t len)
 {
 	char *bb;
 
diff --git a/sys/sys/libkern.h b/sys/sys/libkern.h
index 7af0ee9ecd61..0d6b818f693c 100644
--- a/sys/sys/libkern.h
+++ b/sys/sys/libkern.h
@@ -128,7 +128,6 @@ struct malloc_type;
 uint32_t arc4random(void);
 void	 arc4random_buf(void *, size_t);
 void	 arc4rand(void *, u_int, int);
-int	 bcmp(const void *, const void *, size_t);
 int	 timingsafe_bcmp(const void *, const void *, size_t);
 void	*bsearch(const void *, const void *, size_t,
 	    size_t, int (*)(const void *, const void *));
@@ -160,7 +159,6 @@ int	 fnmatch(const char *, const char *, int);
 int	 locc(int, char *, u_int);
 void	*memchr(const void *s, int c, size_t n);
 void	*memcchr(const void *s, int c, size_t n);
-int	 memcmp(const void *b1, const void *b2, size_t len);
 void	*memmem(const void *l, size_t l_len, const void *s, size_t s_len);
 void	 qsort(void *base, size_t nmemb, size_t size,
 	    int (*compar)(const void *, const void *));
diff --git a/sys/sys/systm.h b/sys/sys/systm.h
index 4c9ab65f7c7d..fc81cd4e6421 100644
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -259,25 +259,21 @@ void	hexdump(const void *ptr, int length, const char *hdr, int flags);
 
 #define ovbcopy(f, t, l) bcopy((f), (t), (l))
 void	bcopy(const void * _Nonnull from, void * _Nonnull to, size_t len);
-#define bcopy(from, to, len) ({				\
-	if (__builtin_constant_p(len) && (len) <= 64)	\
-		__builtin_memmove((to), (from), (len));	\
-	else						\
-		bcopy((from), (to), (len));		\
-})
+#define bcopy(from, to, len) __builtin_memmove((to), (from), (len))
 void	bzero(void * _Nonnull buf, size_t len);
-#define bzero(buf, len) ({				\
-	if (__builtin_constant_p(len) && (len) <= 64)	\
-		__builtin_memset((buf), 0, (len));	\
-	else						\
-		bzero((buf), (len));			\
-})
+#define bzero(buf, len) __builtin_memset((buf), 0, (len))
 void	explicit_bzero(void * _Nonnull, size_t);
+int	bcmp(const void *b1, const void *b2, size_t len);
+#define bcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len))
 
 void	*memset(void * _Nonnull buf, int c, size_t len);
+#define memset(buf, c, len) __builtin_memset((buf), (c), (len))
 void	*memcpy(void * _Nonnull to, const void * _Nonnull from, size_t len);
-#define memcpy(to, from, len) __builtin_memcpy(to, from, len)
+#define memcpy(to, from, len) __builtin_memcpy((to), (from), (len))
 void	*memmove(void * _Nonnull dest, const void * _Nonnull src, size_t n);
+#define memmove(dest, src, n) __builtin_memmove((dest), (src), (n))
+int	memcmp(const void *b1, const void *b2, size_t len);
+#define memcmp(b1, b2, len) __builtin_memcmp((b1), (b2), (len))
 
 int	copystr(const void * _Nonnull __restrict kfaddr,
 	    void * _Nonnull __restrict kdaddr, size_t len,
diff --git a/sys/sys/zutil.h b/sys/sys/zutil.h
index 733185f2d00e..4b9541d4dab7 100644
--- a/sys/sys/zutil.h
+++ b/sys/sys/zutil.h
@@ -32,8 +32,6 @@
 #include <sys/param.h>
 #include <sys/kernel.h>
 #  define HAVE_MEMCPY
-#  define memset(d, v, n)	bzero((d), (n))
-#  define memcmp		bcmp
 
 #else
 #if defined(__KERNEL__)