[Octave-bug-tracker] [bug #48804] int64 almost double??

[Ernst Reissner]

URL:
  <http://savannah.gnu.org/bugs/?48804>

                 Summary: int64 almost double??
                 Project: GNU Octave
            Submitted by: ernstreissner
            Submitted on: Tue 16 Aug 2016 11:27:08 PM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

The maximum int64 is 

octave:30> int64(0x7FFFFFFFFFFFFFFF)
ans = 9223372036854775807

ok. 
but: 

octave:35> int64(0x7FFFFFFFFFFFFFF0)
ans = 9223372036854775807
octave:36> int64(0x7FFFFFFFFFFFFF00)
ans = 9223372036854775807
octave:39> int64(0x7FFFFFFFFFFFFC00)
ans = 9223372036854774784
octave:40> int64(0x7FFFFFFFFFFFFE00)

The latter numbers should all be even, right? 
I suspect, Octave's int64 are double with only 53 digit mantissa. 





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