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/* Test whether strncmp has not been "optimized" into memcmp

   nor any code with memcmp semantics.  */

/* { dg-do run { target i?86-*-linux* x86_64-*-linux* ia64-*-linux* alpha*-*-linux* powerpc*-*-linux* s390*-*-linux* sparc*-*-linux* *-*-darwin* } } */

/* { dg-options "-O2" } */

#include <stddef.h>

#include <stdio.h>

#include <sys/mman.h>

#ifndef MAP_ANONYMOUS

#define MAP_ANONYMOUS MAP_ANON

#endif

#include <stdlib.h>

void __attribute__((noinline)) test (const char *p)

{

  if (__builtin_strncmp (p, "abcdefghijklmnopq", 17) == 0)

    abort ();

}

int main (void)

{

  char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE,

                  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  if (p == MAP_FAILED)

    return 0;

  if (munmap (p + 65536, 65536) < 0)

    return 0;

  __builtin_memcpy (p + 65536 - 5, "abcd", 5);

  test (p + 65536 - 5);

  return 0;

}