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

   1 /* Copyright (C) 2002, 2005  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 } */
  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 int
  40 main ()
  41 {
  42   int off, len, i;
  43   char *p, *q;
  44
  45   for (off = 0; off < MAX_OFFSET; off++)
  46     for (len = 1; len < MAX_COPY; len++)
  47       {
  48         for (i = 0; i < MAX_LENGTH; i++)
  49           u.buf[i] = 'a';
  50
  51         p = memset (u.buf + off, '\0', len);
  52         if (p != u.buf + off)
  53           abort ();
  54
  55         q = u.buf;
  56         for (i = 0; i < off; i++, q++)
  57           if (*q != 'a')
  58             abort ();
  59
  60         for (i = 0; i < len; i++, q++)
  61           if (*q != '\0')
  62             abort ();
  63
  64         for (i = 0; i < MAX_EXTRA; i++, q++)
  65           if (*q != 'a')
  66             abort ();
  67
  68         p = memset (u.buf + off, A, len);
  69         if (p != u.buf + off)
  70           abort ();
  71
  72         q = u.buf;
  73         for (i = 0; i < off; i++, q++)
  74           if (*q != 'a')
  75             abort ();
  76
  77         for (i = 0; i < len; i++, q++)
  78           if (*q != 'A')
  79             abort ();
  80
  81         for (i = 0; i < MAX_EXTRA; i++, q++)
  82           if (*q != 'a')
  83             abort ();
  84
  85         p = memset (u.buf + off, 'B', len);
  86         if (p != u.buf + off)
  87           abort ();
  88
  89         q = u.buf;
  90         for (i = 0; i < off; i++, q++)
  91           if (*q != 'a')
  92             abort ();
  93
  94         for (i = 0; i < len; i++, q++)
  95           if (*q != 'B')
  96             abort ();
  97
  98         for (i = 0; i < MAX_EXTRA; i++, q++)
  99           if (*q != 'a')
 100             abort ();
 101       }
 102
 103   exit(0);
 104 }
 105