gcc/testsuite/gcc.dg/strlenopt-16g.c

   1 /* This test needs runtime that provides stpcpy function.  */
   2 /* { dg-do run { target *-*-linux* *-*-gnu* *-*-uclinux* } } */
   3 /* { dg-options "-O2 -fdump-tree-strlen" } */
   4
   5 #define USE_GNU
   6 #include "strlenopt.h"
   7
   8 __attribute__((noinline, noclone)) char *
   9 fn1 (char *p, const char *q)
  10 {
  11   /* This strcpy can be optimized into stpcpy.  */
  12   strcpy (p, q);
  13   /* And this strchr into the return value from it.  */
  14   return strchr (p, '\0');
  15 }
  16
  17 int
  18 main ()
  19 {
  20   char buf[64];
  21   const char *volatile q = "ABCDEFGH";
  22   if (fn1 (buf, q) != buf + 8 || memcmp (buf, "ABCDEFGH", 9) != 0)
  23     abort ();
  24   return 0;
  25 }
  26
  27 /* { dg-final { scan-tree-dump-times "strlen \\(" 0 "strlen1" } } */
  28 /* { dg-final { scan-tree-dump-times "memcpy \\(" 0 "strlen1" } } */
  29 /* { dg-final { scan-tree-dump-times "mempcpy \\(" 0 "strlen1" } } */
  30 /* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen1" } } */
  31 /* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen1" } } */
  32 /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen1" } } */
  33 /* { dg-final { scan-tree-dump-times "stpcpy \\(" 1 "strlen1" } } */