| /* 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; |
| } |
