gcc/testsuite/gcc.dg/strlenopt-4.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fdump-tree-strlen" } */
   3
   4 #include "strlenopt.h"
   5
   6 /* If stpcpy can't be used, this is optimized into
   7    strcpy (p, q); strcat (p, r); memcpy (p + strlen (p), "abcd", 5);
   8    If stpcpy can be used (see strlenopt-4g.c test),
   9    this is optimized into
  10    memcpy (stpcpy (stpcpy (p, q), r), "abcd", 5);  */
  11 __attribute__((noinline, noclone)) void
  12 foo (char *p, const char *q, const char *r)
  13 {
  14   strcpy (p, q);
  15   strcat (p, r);
  16   strcat (p, "abcd");
  17 }
  18
  19 /* If stpcpy can't be used, this is optimized into
  20    memcpy (p, "abcd", 4); strcpy (p + 4, q); strcat (p, r);
  21    If stpcpy can be used, this is optimized into
  22    memcpy (p, "abcd", 4); strcpy (stpcpy (p + 4, q), r);  */
  23 __attribute__((noinline, noclone)) void
  24 bar (char *p, const char *q, const char *r)
  25 {
  26   strcpy (p, "abcd");
  27   strcat (p, q);
  28   strcat (p, r);
  29 }
  30
  31 /* If stpcpy can't be used, this is optimized into
  32    strcat (p, q); memcpy (t1 = p + strlen (p), "abcd", 4);
  33    strcpy (t1 + 4, r); memcpy (p + strlen (p), "efgh", 5);
  34    If stpcpy can be used, this is optimized into
  35    t1 = stpcpy (p + strlen (p), q); memcpy (t1, "abcd", 4);
  36    memcpy (stpcpy (t1 + 4, r), "efgh", 5);  */
  37 __attribute__((noinline, noclone)) void
  38 baz (char *p, const char *q, const char *r)
  39 {
  40   strcat (p, q);
  41   strcat (p, "abcd");
  42   strcat (p, r);
  43   strcat (p, "efgh");
  44 }
  45
  46 char buf[64];
  47
  48 int
  49 main ()
  50 {
  51   char *volatile p = buf;
  52   const char *volatile q = "ij";
  53   const char *volatile r = "klmno";
  54   foo (p, q, r);
  55   if (memcmp (buf, "ijklmnoabcd\0\0\0\0\0\0\0\0", 20) != 0)
  56     abort ();
  57   memset (buf, '\0', sizeof buf);
  58   bar (p, q, r);
  59   if (memcmp (buf, "abcdijklmno\0\0\0\0\0\0\0\0", 20) != 0)
  60     abort ();
  61   memset (buf, 'v', 3);
  62   memset (buf + 3, '\0', -3 + sizeof buf);
  63   baz (p, q, r);
  64   if (memcmp (buf, "vvvijabcdklmnoefgh\0", 20) != 0)
  65     abort ();
  66   return 0;
  67 }
  68
  69 /* { dg-final { scan-tree-dump-times "strlen \\(" 3 "strlen" } } */
  70 /* { dg-final { scan-tree-dump-times "memcpy \\(" 4 "strlen" } } */
  71 /* { dg-final { scan-tree-dump-times "strcpy \\(" 3 "strlen" } } */
  72 /* { dg-final { scan-tree-dump-times "strcat \\(" 3 "strlen" } } */
  73 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */
  74 /* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */