gcc/testsuite/gcc.dg/strlenopt-46.c

/* PR tree-optimization/86204 - wrong strlen result after prior strnlen
   { dg-do run }
   { dg-options "-O2 -Wall -fdump-tree-optimized" } */

#include "strlenopt.h"

#define NOIPA   __attribute__ ((noipa))

char a[] = "12345";

NOIPA void f0 (void)
{
  unsigned n0 = strnlen (a, 0);
  unsigned n1 = strlen (a);

  if (n0 != 0 || n1 != 5)
    abort ();
}

NOIPA void f1 (void)
{
  unsigned n0 = strnlen (a, 1);
  unsigned n1 = strlen (a);

  if (n0 != 1 || n1 != 5)
    abort ();
}

NOIPA void f2 (void)
{
  unsigned n0 = strnlen (a, 2);
  unsigned n1 = strlen (a);

  if (n0 != 2 || n1 != 5)
    abort ();
}

NOIPA void f3 (void)
{
  unsigned n0 = strnlen (a, 3);
  unsigned n1 = strlen (a);

  if (n0 != 3 || n1 != 5)
    abort ();
}

NOIPA void f4 (void)
{
  unsigned n0 = strnlen (a, 4);
  unsigned n1 = strlen (a);

  if (n0 != 4 || n1 != 5)
    abort ();
}

NOIPA void f5 (void)
{
  unsigned n0 = strnlen (a, 5);
  unsigned n1 = strlen (a);

  if (n0 != 5 || n1 != 5)
    abort ();
}

NOIPA void f6 (void)
{
  unsigned n0 = strnlen (a, 6);
  unsigned n1 = strlen (a);

  if (n0 != 5 || n1 != 5)
    abort ();
}

NOIPA void fx (unsigned n)
{
  unsigned n0 = strnlen (a, n);
  unsigned n1 = strlen (a);

  unsigned min = n < 5 ? n : 5;
  if (n0 != min || n1 != 5)
    abort ();
}

NOIPA void g2 (void)
{
  strcpy (a, "123");
  unsigned n0 = strnlen (a, 2);
  unsigned n1 = strlen (a);

  if (n0 != 2 || n1 != 3)
    abort ();
}

NOIPA void g7 (void)
{
  strcpy (a, "123");
  unsigned n0 = strnlen (a, 7);
  unsigned n1 = strlen (a);

  if (n0 != 3 || n1 != 3)
    abort ();
}

NOIPA void gx (unsigned n)
{
  strcpy (a, "123");
  unsigned n0 = strnlen (a, n);
  unsigned n1 = strlen (a);

  unsigned min = n < 3 ? n : 3;
  if (n0 != min || n1 != 3)
    abort ();
}

int main (void)
{
  f0 ();
  f1 ();
  f2 ();
  f3 ();
  f4 ();
  f5 ();
  f6 ();
  fx (2);
  fx (7);

  g2 ();
  g7 ();
  gx (2);
  gx (7);
}


/* For targets like Solaris 10 that don't define strnlen().  */

NOIPA size_t
strnlen (const char *s, size_t n)
{
  size_t len = 0;
  while (*s++ && n--)
    ++len;
  return len;
}

/* Verify that at least some of the 11 calls to strnlen have been
   folded (this number of folded calls may need to be adjusted up
   if the strnlen optimization improves, but it should not go down.
  { dg-final { scan-tree-dump-times "= strnlen" 7 "optimized" } } */