gcc/testsuite/gcc.dg/strlenopt-26.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-strlen" } */
   3
   4 #include "strlenopt.h"
   5
   6 __attribute__((noinline, noclone)) size_t
   7 fn1 (char *p, const char *r)
   8 {
   9   size_t len1 = strlen (r);
  10   char *q = strchr (p, '\0');
  11   *q = '\0';
  12   return len1 - strlen (r); // This strlen should be optimized into len1.
  13 }
  14
  15 int
  16 main (void)
  17 {
  18   char p[] = "foobar";
  19   const char *volatile q = "xyzzy";
  20   fn1 (p, q);
  21   return 0;
  22 }
  23
  24 /* { dg-final { scan-tree-dump-times "strlen \\(" 2 "strlen" } } */
  25 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */