diff options
Diffstat (limited to 'gcc-4.9/gcc/testsuite/gcc.dg/20050826-1.c')
-rw-r--r-- | gcc-4.9/gcc/testsuite/gcc.dg/20050826-1.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/20050826-1.c b/gcc-4.9/gcc/testsuite/gcc.dg/20050826-1.c new file mode 100644 index 000000000..9595236cf --- /dev/null +++ b/gcc-4.9/gcc/testsuite/gcc.dg/20050826-1.c @@ -0,0 +1,52 @@ +/* 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> +/* Darwin spells this differently */ +#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> + + struct Flags { + int filler[18]; + unsigned int a:14; + unsigned int b:14; + unsigned int c:1; + unsigned int d:1; + unsigned int e:1; + unsigned int f:1; + }; +static void __attribute__((noinline)) set (struct Flags *); +static void set (struct Flags *fp) +{ + fp->b = 5; + fp->d = 1; +} + +static int __attribute__((noinline)) bar (int); +static int bar(int x) { return !(x==1); } +int main (void) +{ + char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + struct Flags *fp; + if (p == MAP_FAILED) + return 0; + if (munmap (p + 65536, 65536) < 0) + return 0; + fp = (struct Flags*)(p + 65536 - sizeof(struct Flags)); + set(fp); + if (fp->b > 0) + return (bar(fp->d)); + return 1; +} |