Get rid of out of line memset(), as __builtin_memset() is not larger - even usually smaller - and faster anyway in all current and foreseeable occurrences.

lib/string.c

@@ -74,16 +74,6 @@ void *memmove(void *dest, const void *src, size_t n)
     return dest;
 }
 
-void *memset(void *s, int c, size_t n)
-{
-    char *d = (char *)s;
-
-    for (size_t i = 0; i < n; i++) {
-        d[i] = c;
-    }
-    return s;
-}
-
 size_t strlen(const char *s)
 {
     size_t len = 0;

lib/string.h

@@ -37,8 +37,9 @@ void *memmove(void *dest, const void *src, size_t n);
 /**
  * Fills the first n bytes of the memory area pointed to by s with the byte
  * value c.
+ * void *memset(void *s, int c, size_t n);
  */
-void *memset(void *s, int c, size_t n);
+#define memset(s, c, n) __builtin_memset((s), (c), (n))
 
 /**
  * Returns the string length, excluding the terminating null character.