bugGNU Octave - Bugs: bug #48804, int64 almost double??

 
 

bug #48804: int64 almost double??

Submitter:  Ernst Reissner <ernstreissner>
Submitted:  Tue 16 Aug 2016 11:27:08 PM UTC
   
 
Category:  None Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  Duplicate Assigned to:  None
Originator Name:  Open/Closed:  * Closed
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Wed 17 Aug 2016 05:23:03 AM UTC, comment #1: 

I think this is a duplicate of bug #45945.

Octave's int64 variables are stored as 64-bit integers, not doubles.  The problem is with parsing large integer constants and converting them all to double.

John W. Eaton <jwe>
Group administrator
Tue 16 Aug 2016 11:27:08 PM UTC, original submission:  

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.

Ernst Reissner <ernstreissner>

 

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2016-08-17 mtmiller Dependencies- Depends on bugs #45945
    2016-08-17 jwe StatusNone Duplicate
        Open/ClosedOpen Closed
    2016-08-16 ernstreissner Carbon-Copy- Added -email is unavailable-

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