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

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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>

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>

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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Depends on the following items

Missing Matlab's special support for int64/uint64 integer literals (bug #45945, Fixed)

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Items that depend on this one: None found

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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	Status	None	Duplicate
		Open/Closed	Open	Closed
2016-08-16	ernstreissner	Carbon-Copy	-	Added -email is unavailable-

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

bug #48804: int64 almost double??

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