[Octave-bug-tracker] [bug #54572] int64 does not saturate correctly in negative direction

[Dan Sebald]

URL:
  <http://savannah.gnu.org/bugs/?54572>

                 Summary: int64 does not saturate correctly in negative
direction
                 Project: GNU Octave
            Submitted by: sebald
            Submitted on: Sun 26 Aug 2018 06:27:09 AM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

This seems odd:


octave:169> intmin('int64') - 0
ans = -9223372036854775808
octave:170> intmin('int64') - 1
ans = 9223372036854775807
octave:171> intmin('int64') - 2
ans = 9223372036854775807
octave:172> intmin('int64') - 3
ans = 9223372036854775807


However, int32 behaves as expected:


octave:177> intmin('int32') - 0
ans = -2147483648
octave:178> intmin('int32') - 1
ans = -2147483648
octave:179> intmin('int32') - 2
ans = -2147483648
octave:180> intmin('int32') - 3





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