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111
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1 /* Test whether strncmp has not been "optimized" into memcmp
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2 nor any code with memcmp semantics. */
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3 /* { dg-do run { target mmap } } */
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4 /* { dg-options "-O2" } */
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5 #include <stddef.h>
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6 #include <stdio.h>
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7 #include <sys/mman.h>
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8 /* Darwin spells this differently */
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9 #ifndef MAP_ANONYMOUS
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10 #define MAP_ANONYMOUS MAP_ANON
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11 #endif
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12 #ifndef MAP_ANON
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13 #define MAP_ANON 0
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14 #endif
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15 #ifndef MAP_FAILED
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16 #define MAP_FAILED ((void *)-1)
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17 #endif
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18 #include <stdlib.h>
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19
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20 struct Flags {
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21 int filler[18];
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22 unsigned int a:14;
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23 unsigned int b:14;
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24 unsigned int c:1;
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25 unsigned int d:1;
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26 unsigned int e:1;
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27 unsigned int f:1;
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28 };
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29 static void __attribute__((noinline)) set (struct Flags *);
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30 static void set (struct Flags *fp)
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31 {
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32 fp->b = 5;
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33 fp->d = 1;
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34 }
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35
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36 static int __attribute__((noinline)) bar (int);
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37 static int bar(int x) { return !(x==1); }
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38 int main (void)
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39 {
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40 char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE,
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41 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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42 struct Flags *fp;
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43 if (p == MAP_FAILED)
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44 return 0;
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45 if (munmap (p + 65536, 65536) < 0)
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46 return 0;
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47 fp = (struct Flags*)(p + 65536 - sizeof(struct Flags));
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48 set(fp);
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49 if (fp->b > 0)
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50 return (bar(fp->d));
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51 return 1;
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52 }
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