gcc/testsuite/gcc.c-torture/execute/builtins/memmove-2.c

   1 /* Copyright (C) 2004  Free Software Foundation.
   2
   3    Check builtin memmove and bcopy optimization when length is 1.
   4
   5    Written by Jakub Jelinek, 9/14/2004.  */
   6
   7 extern void abort (void);
   8 typedef __SIZE_TYPE__ size_t;
   9 extern void *memmove (void *, const void *, size_t);
  10 extern void bcopy (const void *, void *, size_t);
  11 extern int memcmp (const void *, const void *, size_t);
  12
  13 char p[32] = "abcdefg";
  14 char *q = p + 4;
  15
  16 void
  17 main_test (void)
  18 {
  19   /* memmove with length 1 can be optimized into memcpy if it can be
  20      expanded inline.  */
  21   if (memmove (p + 2, p + 3, 1) != p + 2 || memcmp (p, "abddefg", 8))
  22     abort ();
  23   if (memmove (p + 1, p + 1, 1) != p + 1 || memcmp (p, "abddefg", 8))
  24     abort ();
  25   if (memmove (q, p + 4, 1) != p + 4 || memcmp (p, "abddefg", 8))
  26     abort ();
  27   bcopy (p + 5, p + 6, 1);
  28   if (memcmp (p, "abddeff", 8))
  29     abort ();
  30   bcopy (p + 1, p + 1, 1);
  31   if (memcmp (p, "abddeff", 8))
  32     abort ();
  33   bcopy (q, p + 4, 1);
  34   if (memcmp (p, "abddeff", 8))
  35     abort ();
  36 }