gcc/testsuite/gcc.dg/strlenopt-28.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-strlen" } */
   3
   4 #include "strlenopt.h"
   5
   6 volatile int v;
   7
   8 size_t
   9 f1 (void)
  10 {
  11   char a[30];
  12   v += 1;
  13   memcpy (a, "1234567", 8);
  14   memcpy (a + 7, "89abcdefg", 10);
  15   memcpy (a + 16, "h", 2);
  16   return strlen (a);    // This strlen should be optimized into 17.
  17 }
  18
  19 size_t
  20 f2 (void)
  21 {
  22   char a[30];
  23   v += 2;
  24   strcpy (a, "1234567");
  25   strcpy (a + 7, "89abcdefg");
  26   strcpy (a + 16, "h");
  27   return strlen (a);    // This strlen should be optimized into 17.
  28 }
  29
  30 size_t
  31 f3 (char *a)
  32 {
  33   v += 3;
  34   memcpy (a, "1234567", 8);
  35   memcpy (a + 7, "89abcdefg", 10);
  36   memcpy (a + 16, "h", 2);
  37   return strlen (a);    // This strlen should be optimized into 17.
  38 }
  39
  40 size_t
  41 f4 (char *a)
  42 {
  43   v += 4;
  44   strcpy (a, "1234567");
  45   strcpy (a + 7, "89abcdefg");
  46   strcpy (a + 16, "h");
  47   return strlen (a);    // This strlen should be optimized into 17.
  48 }
  49
  50 int
  51 main ()
  52 {
  53   char a[30];
  54   if (f1 () != 17 || f2 () != 17 || f3 (a) != 17 || f4 (a) != 17)
  55     abort ();
  56   return 0;
  57 }
  58
  59 /* { dg-final { scan-tree-dump-times "strlen \\(" 0 "strlen" } } */