37 lines
842 B
C
37 lines
842 B
C
/* Test whether strncmp has not been "optimized" into memcmp
|
|
nor any code with memcmp semantics. */
|
|
/* { dg-do run { target mmap } } */
|
|
/* { dg-options "-O2" } */
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <sys/mman.h>
|
|
#ifndef MAP_ANONYMOUS
|
|
#define MAP_ANONYMOUS MAP_ANON
|
|
#endif
|
|
#ifndef MAP_ANON
|
|
#define MAP_ANON 0
|
|
#endif
|
|
#ifndef MAP_FAILED
|
|
#define MAP_FAILED ((void *)-1)
|
|
#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;
|
|
}
|