gcc/testsuite/gcc.dg/strlenopt-15.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, size_t l)
   8 {
   9   memcpy (p, "abcdef", l);
  10   /* This strlen can't be optimized, as l is unknown.  */
  11   return strlen (p);
  12 }
  13
  14 __attribute__((noinline, noclone)) size_t
  15 fn2 (char *p, const char *q, size_t *lp)
  16 {
  17   size_t l = strlen (q), l2;
  18   memcpy (p, q, 7);
  19   /* This strlen can't be optimized, as l might be bigger than 7.  */
  20   l2 = strlen (p);
  21   *lp = l;
  22   return l2;
  23 }
  24
  25 __attribute__((noinline, noclone)) char *
  26 fn3 (char *p)
  27 {
  28   *p = 0;
  29   return p + 1;
  30 }
  31
  32 int
  33 main ()
  34 {
  35   char buf[64];
  36   const char *volatile q = "ABCDEFGH";
  37   const char *volatile q2 = "IJ\0KLMNOPQRS";
  38   size_t l;
  39   memset (buf, '\0', sizeof buf);
  40   memset (buf + 2, 'a', 7);
  41   if (fn1 (buf, 3) != 9 || memcmp (buf, "abcaaaaaa", 10) != 0)
  42     abort ();
  43   if (fn1 (buf, 7) != 6 || memcmp (buf, "abcdef\0aa", 10) != 0)
  44     abort ();
  45   if (fn2 (buf, q, &l) != 9 || l != 8 || memcmp (buf, "ABCDEFGaa", 10) != 0)
  46     abort ();
  47   if (fn2 (buf, q2, &l) != 2 || l != 2 || memcmp (buf, "IJ\0KLMNaa", 10) != 0)
  48     abort ();
  49   if (fn3 (buf) != buf + 1 || memcmp (buf, "\0J\0KLMNaa", 10) != 0)
  50     abort ();
  51   return 0;
  52 }
  53
  54 /* { dg-final { scan-tree-dump-times "strlen \\(" 3 "strlen" } } */
  55 /* { dg-final { scan-tree-dump-times "memcpy \\(" 2 "strlen" } } */
  56 /* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen" } } */
  57 /* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */
  58 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */
  59 /* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */