gcc/testsuite/gcc.c-torture/execute/builtins/memcmp.c

   1 /* Copyright (C) 2001  Free Software Foundation.
   2
   3    Ensure that short builtin memcmp are optimized and perform correctly.
   4    On architectures with a cmpstrsi instruction, this test doesn't determine
   5    which optimization is being performed, but it does check for correctness.
   6
   7    Written by Roger Sayle, 12/02/2001.
   8    Additional tests by Roger Sayle after PR 3508, 12/26/2001.  */
   9
  10 extern void abort (void);
  11 typedef __SIZE_TYPE__ size_t;
  12 extern int memcmp (const void *, const void *, size_t);
  13 extern char *strcpy (char *, const char *);
  14 extern void link_error (void);
  15
  16 void
  17 main_test (void)
  18 {
  19   char str[8];
  20
  21   strcpy (str, "3141");
  22
  23   if ( memcmp (str, str+2, 0) != 0 )
  24     abort ();
  25   if ( memcmp (str+1, str+3, 0) != 0 )
  26     abort ();
  27
  28   if ( memcmp (str+1, str+3, 1) != 0 )
  29     abort ();
  30   if ( memcmp (str, str+2, 1) >= 0 )
  31     abort ();
  32   if ( memcmp (str+2, str, 1) <= 0 )
  33     abort ();
  34
  35   if (memcmp ("abcd", "efgh", 4) >= 0)
  36     link_error ();
  37   if (memcmp ("abcd", "abcd", 4) != 0)
  38     link_error ();
  39   if (memcmp ("efgh", "abcd", 4) <= 0)
  40     link_error ();
  41 }