gnu/dist/gcc4/gcc/testsuite/gcc.c-torture/execute/builtins/strcpy-2.c

   1 /* Copyright (C) 2004  Free Software Foundation.
   2
   3    Ensure builtin strcpy is optimized into memcpy
   4    even when there is more than one possible string literal
   5    passed to it, but all string literals passed to it
   6    have equal length.
   7
   8    Written by Jakub Jelinek, 9/15/2004.  */
   9
  10 extern void abort (void);
  11 extern char *strcpy (char *, const char *);
  12 typedef __SIZE_TYPE__ size_t;
  13 extern void *memcpy (void *, const void *, size_t);
  14 extern int memcmp (const void *, const void *, size_t);
  15
  16 char buf[32], *p;
  17 int i;
  18
  19 char *
  20 __attribute__((noinline))
  21 test (void)
  22 {
  23   int j;
  24   const char *q = "abcdefg";
  25   for (j = 0; j < 3; ++j)
  26     {
  27       if (j == i)
  28         q = "bcdefgh";
  29       else if (j == i + 1)
  30         q = "cdefghi";
  31       else if (j == i + 2)
  32         q = "defghij";
  33     }
  34   p = strcpy (buf, q);
  35   return strcpy (buf + 16, q);
  36 }
  37
  38 void
  39 main_test (void)
  40 {
  41 #ifndef __OPTIMIZE_SIZE__
  42   /* For -Os, strcpy above is not replaced with
  43      memcpy (buf, q, 8);, as that is larger.  */
  44   if (test () != buf + 16 || p != buf)
  45     abort ();
  46 #endif
  47 }