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 #ifndef MAX_OFFSET
  14 #define MAX_OFFSET (sizeof (long long))
  15 #endif
  16
  17 #ifndef MAX_COPY
  18 #define MAX_COPY (8 * sizeof (long long))
  19 #endif
  20
  21 #ifndef MAX_EXTRA
  22 #define MAX_EXTRA (sizeof (long long))
  23 #endif
  24
  25 #define MAX_LENGTH (MAX_OFFSET + MAX_COPY + MAX_EXTRA)
  26
  27 static union {
  28   char buf[MAX_LENGTH];
  29   long long align_int;
  30   long double align_fp;
  31 } u;
  32
  33 char A = 'A';
  34
  35 main ()
  36 {
  37   int off, len, i;
  38   char *p, *q;
  39
  40   for (off = 0; off < MAX_OFFSET; off++)
  41     for (len = 1; len < MAX_COPY; len++)
  42       {
  43         for (i = 0; i < MAX_LENGTH; i++)
  44           u.buf[i] = 'a';
  45
  46         p = memset (u.buf + off, '\0', len);
  47         if (p != u.buf + off)
  48           abort ();
  49
  50         q = u.buf;
  51         for (i = 0; i < off; i++, q++)
  52           if (*q != 'a')
  53             abort ();
  54
  55         for (i = 0; i < len; i++, q++)
  56           if (*q != '\0')
  57             abort ();
  58
  59         for (i = 0; i < MAX_EXTRA; i++, q++)
  60           if (*q != 'a')
  61             abort ();
  62
  63         p = memset (u.buf + off, A, len);
  64         if (p != u.buf + off)
  65           abort ();
  66
  67         q = u.buf;
  68         for (i = 0; i < off; i++, q++)
  69           if (*q != 'a')
  70             abort ();
  71
  72         for (i = 0; i < len; i++, q++)
  73           if (*q != 'A')
  74             abort ();
  75
  76         for (i = 0; i < MAX_EXTRA; i++, q++)
  77           if (*q != 'a')
  78             abort ();
  79
  80         p = memset (u.buf + off, 'B', len);
  81         if (p != u.buf + off)
  82           abort ();
  83
  84         q = u.buf;
  85         for (i = 0; i < off; i++, q++)
  86           if (*q != 'a')
  87             abort ();
  88
  89         for (i = 0; i < len; i++, q++)
  90           if (*q != 'B')
  91             abort ();
  92
  93         for (i = 0; i < MAX_EXTRA; i++, q++)
  94           if (*q != 'a')
  95             abort ();
  96       }
  97
  98   exit(0);
  99 }
 100