gcc/testsuite/gcc.dg/strlenopt-19.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-strlen" } */
   3
   4 #include "strlenopt.h"
   5
   6 __attribute__((noinline, noclone)) char *
   7 fn1 (int x, int y, int z)
   8 {
   9   static char buf[40];
  10   const char *p;
  11   switch (x)
  12     {
  13     case 0:
  14       p = "abcd";
  15       /* Prevent cswitch optimization.  */
  16       asm volatile ("" : : : "memory");
  17       break;
  18     case 1:
  19       p = "efgh";
  20       break;
  21     case 2:
  22       p = "ijkl";
  23       break;
  24     default:
  25       p = "mnop";
  26       break;
  27     }
  28   if (y)
  29     {
  30       strcpy (buf, p);
  31       if (z)
  32         strcat (buf, "ABCDEFG");
  33       else
  34         strcat (buf, "HIJKLMN");
  35     }
  36   else
  37     {
  38       strcpy (buf, p + 1);
  39       if (z)
  40         strcat (buf, "OPQ");
  41       else
  42         strcat (buf, "RST");
  43     }
  44   return buf;
  45 }
  46
  47 int
  48 main ()
  49 {
  50   int i;
  51   for (i = 0; i < 5; i++)
  52     {
  53       const char *p = "abcdefghijklmnop" + (i < 3 ? i : 3) * 4;
  54       const char *q;
  55       fn1 (i ? 0 : 1, 1, 1);
  56       q = fn1 (i, 0, 0);
  57       if (memcmp (q, p + 1, 3) != 0 || memcmp (q + 3, "RST", 4) != 0)
  58         abort ();
  59       fn1 (i ? 0 : 1, 0, 1);
  60       q = fn1 (i, 1, 0);
  61       if (memcmp (q, p, 4) != 0 || memcmp (q + 4, "HIJKLMN", 8) != 0)
  62         abort ();
  63       fn1 (i ? 0 : 1, 1, 0);
  64       q = fn1 (i, 0, 1);
  65       if (memcmp (q, p + 1, 3) != 0 || memcmp (q + 3, "OPQ", 4) != 0)
  66         abort ();
  67       fn1 (i ? 0 : 1, 0, 0);
  68       q = fn1 (i, 1, 1);
  69       if (memcmp (q, p, 4) != 0 || memcmp (q + 4, "ABCDEFG", 8) != 0)
  70         abort ();
  71     }
  72   return 0;
  73 }
  74
  75 /* { dg-final { scan-tree-dump-times "strlen \\(" 0 "strlen" } } */
  76 /* { dg-final { scan-tree-dump-times "memcpy \\(" 6 "strlen" } } */
  77 /* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen" } } */
  78 /* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */
  79 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */
  80 /* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */