gcc/testsuite/gcc.dg/strlenopt-3.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-strlen -fdump-tree-optimized" } */
   3
   4 #include "strlenopt.h"
   5
   6 __attribute__((noinline, noclone)) size_t
   7 fn1 (char *p, char *q)
   8 {
   9   size_t s = strlen (q);
  10   strcpy (p, q);
  11   return s - strlen (p);
  12 }
  13
  14 __attribute__((noinline, noclone)) size_t
  15 fn2 (char *p, char *q)
  16 {
  17   size_t s = strlen (q);
  18   memcpy (p, q, s + 1);
  19   return s - strlen (p);
  20 }
  21
  22 __attribute__((noinline, noclone)) size_t
  23 fn3 (char *p)
  24 {
  25   memcpy (p, "abcd", 5);
  26   return strlen (p);
  27 }
  28
  29 __attribute__((noinline, noclone)) size_t
  30 fn4 (char *p)
  31 {
  32   memcpy (p, "efg\0hij", 6);
  33   return strlen (p);
  34 }
  35
  36 int
  37 main ()
  38 {
  39   char buf[64];
  40   char *volatile p = buf;
  41   char *volatile q = "ABCDEF";
  42   buf[7] = 'G';
  43   if (fn1 (p, q) != 0 || memcmp (buf, "ABCDEF\0G", 8))
  44     abort ();
  45   q = "HIJ";
  46   if (fn2 (p + 1, q) != 0 || memcmp (buf, "AHIJ\0F\0G", 8))
  47     abort ();
  48   buf[6] = 'K';
  49   if (fn3 (p + 1) != 4 || memcmp (buf, "Aabcd\0KG", 8))
  50     abort ();
  51   if (fn4 (p) != 3 || memcmp (buf, "efg\0hiKG", 8))
  52     abort ();
  53   return 0;
  54 }
  55
  56 /* { dg-final { scan-tree-dump-times "strlen \\(" 2 "strlen" } } */
  57 /* { dg-final { scan-tree-dump-times "memcpy \\(" 4 "strlen" } } */
  58 /* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen" } } */
  59 /* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */
  60 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */
  61 /* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */
  62 /* { dg-final { scan-tree-dump-times "return 0" 3 "optimized" } } */
  63 /* { dg-final { scan-tree-dump-times "return 4" 1 "optimized" } } */
  64 /* { dg-final { scan-tree-dump-times "return 3" 1 "optimized" } } */