gcc/testsuite/gcc.c-torture/execute/memset-1.c

   1 /* Copyright (C) 2002  Free Software Foundation.
   2
   3    Test memset with various combinations of pointer alignments and lengths to
   4    make sure any optimizations in the library are correct.
   5
   6    Written by Michael Meissner, March 9, 2002.  */
   7
   8 #include <string.h>
   9
  10 #ifndef MAX_OFFSET
  11 #define MAX_OFFSET (sizeof (long long))
  12 #endif
  13
  14 #ifndef MAX_COPY
  15 #define MAX_COPY (10 * sizeof (long long))
  16 #endif
  17
  18 #ifndef MAX_EXTRA
  19 #define MAX_EXTRA (sizeof (long long))
  20 #endif
  21
  22 #define MAX_LENGTH (MAX_OFFSET + MAX_COPY + MAX_EXTRA)
  23
  24 static union {
  25   char buf[MAX_LENGTH];
  26   long long align_int;
  27   long double align_fp;
  28 } u;
  29
  30 char A = 'A';
  31
  32 main ()
  33 {
  34   int off, len, i;
  35   char *p, *q;
  36
  37   for (off = 0; off < MAX_OFFSET; off++)
  38     for (len = 1; len < MAX_COPY; len++)
  39       {
  40         for (i = 0; i < MAX_LENGTH; i++)
  41           u.buf[i] = 'a';
  42
  43         p = memset (u.buf + off, '\0', len);
  44         if (p != u.buf + off)
  45           abort ();
  46
  47         q = u.buf;
  48         for (i = 0; i < off; i++, q++)
  49           if (*q != 'a')
  50             abort ();
  51
  52         for (i = 0; i < len; i++, q++)
  53           if (*q != '\0')
  54             abort ();
  55
  56         for (i = 0; i < MAX_EXTRA; i++, q++)
  57           if (*q != 'a')
  58             abort ();
  59
  60         p = memset (u.buf + off, A, len);
  61         if (p != u.buf + off)
  62           abort ();
  63
  64         q = u.buf;
  65         for (i = 0; i < off; i++, q++)
  66           if (*q != 'a')
  67             abort ();
  68
  69         for (i = 0; i < len; i++, q++)
  70           if (*q != 'A')
  71             abort ();
  72
  73         for (i = 0; i < MAX_EXTRA; i++, q++)
  74           if (*q != 'a')
  75             abort ();
  76
  77         p = memset (u.buf + off, 'B', len);
  78         if (p != u.buf + off)
  79           abort ();
  80
  81         q = u.buf;
  82         for (i = 0; i < off; i++, q++)
  83           if (*q != 'a')
  84             abort ();
  85
  86         for (i = 0; i < len; i++, q++)
  87           if (*q != 'B')
  88             abort ();
  89
  90         for (i = 0; i < MAX_EXTRA; i++, q++)
  91           if (*q != 'a')
  92             abort ();
  93       }
  94
  95   exit (0);
  96 }