[Bug c++/64808] New: static_cast double to int on linux 32

[Bug c++/64808] New: static_cast double to int on linux 32

[friend1992friend1992 at yandex dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64808

            Bug ID: 64808
           Summary: static_cast double to int on linux 32
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: friend1992friend1992 at yandex dot ru

I have code :
#include <iostream>
void fun(double _v)
{
    std::cout<<"_v="<<_v<<std::endl;
    long long int var=static_cast< long long int >(_v*1000.);
    std::cout<<"var="<<var<<std::endl;
}
int main(int ac, char** av)
{
    fun(33.33);
    return 0;
}
I try to compile this code on Linux x86_64 with GCC 4.8.2 (g++ test.cpp -o
test64), I get result in console:

_v=33.33
var=33330

but when I try to compile this code on Linux i686 with GCC 4.8.2 (g++ test.cpp
-o test32), I get result in console:

_v=33.33
var=33329

But if I replace "long long int var=static_cast< long long int >(_v*1000.);" to
"double t = _v*1000.; long int var=static_cast< long long int >(t);" I get the
result on Linux i686 with GCC 4.4.5:

_v=33.33
var=33330

[Bug c++/64808] static_cast double to int on linux 32

[friend1992friend1992 at yandex dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64808

--- Comment #1 from friend1992friend1992 at yandex dot ru ---

> get the result on Linux i686 with GCC 4.4.5:
Sorry, GCC 4.8.2:

[Bug c++/64808] static_cast double to int on linux 32

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64808

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
You see the effect of excess precision of a floating point value that cannot be
represented exactly.

*** This bug has been marked as a duplicate of bug 323 ***