gcc/testsuite/gcc.dg/i386-memset-1.c

   1 /* Copyright (C) 2002  Free Software Foundation.
   2
   3    Test -minline-all-stringops memset with various combinations of pointer
   4    alignments and lengths to make sure builtin optimizations are correct.
   5    PR target/6456.
   6
   7    Written by Michael Meissner, March 9, 2002.
   8    Target by Roger Sayle, April 25, 2002.  */
   9
  10 /* { dg-do run { target "i?86-*-*" } } */
  11 /* { dg-options "-O2 -minline-all-stringops" } */
  12
  13 extern void *memset (void *, int, __SIZE_TYPE__);
  14 extern void abort (void);
  15 extern void exit (int);
  16
  17 #ifndef MAX_OFFSET
  18 #define MAX_OFFSET (sizeof (long long))
  19 #endif
  20
  21 #ifndef MAX_COPY
  22 #define MAX_COPY (8 * sizeof (long long))
  23 #endif
  24
  25 #ifndef MAX_EXTRA
  26 #define MAX_EXTRA (sizeof (long long))
  27 #endif
  28
  29 #define MAX_LENGTH (MAX_OFFSET + MAX_COPY + MAX_EXTRA)
  30
  31 static union {
  32   char buf[MAX_LENGTH];
  33   long long align_int;
  34   long double align_fp;
  35 } u;
  36
  37 char A = 'A';
  38
  39 main ()
  40 {
  41   int off, len, i;
  42   char *p, *q;
  43
  44   for (off = 0; off < MAX_OFFSET; off++)
  45     for (len = 1; len < MAX_COPY; len++)
  46       {
  47         for (i = 0; i < MAX_LENGTH; i++)
  48           u.buf[i] = 'a';
  49
  50         p = memset (u.buf + off, '\0', len);
  51         if (p != u.buf + off)
  52           abort ();
  53
  54         q = u.buf;
  55         for (i = 0; i < off; i++, q++)
  56           if (*q != 'a')
  57             abort ();
  58
  59         for (i = 0; i < len; i++, q++)
  60           if (*q != '\0')
  61             abort ();
  62
  63         for (i = 0; i < MAX_EXTRA; i++, q++)
  64           if (*q != 'a')
  65             abort ();
  66
  67         p = memset (u.buf + off, A, len);
  68         if (p != u.buf + off)
  69           abort ();
  70
  71         q = u.buf;
  72         for (i = 0; i < off; i++, q++)
  73           if (*q != 'a')
  74             abort ();
  75
  76         for (i = 0; i < len; i++, q++)
  77           if (*q != 'A')
  78             abort ();
  79
  80         for (i = 0; i < MAX_EXTRA; i++, q++)
  81           if (*q != 'a')
  82             abort ();
  83
  84         p = memset (u.buf + off, 'B', len);
  85         if (p != u.buf + off)
  86           abort ();
  87
  88         q = u.buf;
  89         for (i = 0; i < off; i++, q++)
  90           if (*q != 'a')
  91             abort ();
  92
  93         for (i = 0; i < len; i++, q++)
  94           if (*q != 'B')
  95             abort ();
  96
  97         for (i = 0; i < MAX_EXTRA; i++, q++)
  98           if (*q != 'a')
  99             abort ();
 100       }
 101
 102   exit(0);
 103 }
 104