mailing list of musl libc

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 #include <string.h>
#include <stdlib.h>
#include <atomic.h>

void *memset_explicit(void *dest, register int c, register size_t n)
{
  register unsigned char volatile *p    = dest;
  register unsigned char volatile *stop = p + n;
  for (; p < stop; ++p)
    *p = c;
  // the CAS operation serves as memory barrier, and destroys the
  // information, if it happened to be spilled on the stack
  return a_cas_p(&dest, dest, 0);
}