gcc/testsuite/gcc.dg/strlenopt-17g.c

   1 /* This test needs runtime that provides stpcpy function.  */
   2 /* { dg-do run { target *-*-linux* *-*-gnu* } } */
   3 /* { dg-options "-O2 -fdump-tree-strlen" } */
   4
   5 #define USE_GNU
   6 #include "strlenopt.h"
   7
   8 __attribute__((noinline, noclone)) int
   9 foo (const char *p)
  10 {
  11   static int c;
  12   const char *q[] = { "123498765abcde", "123498765..", "129abcde", "129abcde" };
  13   if (strcmp (p, q[c]) != 0)
  14     abort ();
  15   return c++;
  16 }
  17
  18 __attribute__((noinline, noclone)) void
  19 bar (const char *p, const char *q)
  20 {
  21   size_t l;
  22   /* This strlen stays.  */
  23   char *a = __builtin_alloca (strlen (p) + 50);
  24   /* strcpy can be optimized into memcpy.  */
  25   strcpy (a, p);
  26   /* strcat into stpcpy.  */
  27   strcat (a, q);
  28   /* This strlen can be optimized away.  */
  29   l = strlen (a);
  30   /* This becomes memcpy.  */
  31   strcat (a, "abcde");
  32   if (!foo (a))
  33     /* And this one too.  */
  34     strcpy (a + l, "..");
  35   foo (a);
  36 }
  37
  38 int
  39 main ()
  40 {
  41   const char *volatile s1 = "1234";
  42   const char *volatile s2 = "98765";
  43   const char *volatile s3 = "12";
  44   const char *volatile s4 = "9";
  45   bar (s1, s2);
  46   bar (s3, s4);
  47   return 0;
  48 }
  49
  50 /* { dg-final { scan-tree-dump-times "strlen \\(" 1 "strlen" } } */
  51 /* { dg-final { scan-tree-dump-times "memcpy \\(" 3 "strlen" } } */
  52 /* { dg-final { scan-tree-dump-times "mempcpy \\(" 0 "strlen" } } */
  53 /* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen" } } */
  54 /* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */
  55 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */
  56 /* { dg-final { scan-tree-dump-times "stpcpy \\(" 1 "strlen" } } */