[Bugzilla] [Bug 15506] New: uint64() is puzzled over [uint64(%inf)/2 uint64(%inf)]

[bugzilla.admin at scilab.org]

http://bugzilla.scilab.org/show_bug.cgi?id=15506
--------- Bug Summary -----------
uint64() is puzzled  over [uint64(%inf)/2 uint64(%inf)]

---------- Changed by ------------
sgougeon at free.fr

---------- What changed ----------
bug_id, short_desc, product, version, rep_platform, op_sys, bug_status, bug_severity, priority, component, assigned_to, reporter


            Bug ID: 15506
           Summary: uint64() is puzzled  over [uint64(%inf)/2
                    uint64(%inf)]
           Product: Scilab software
           Version: 6.0.1
          Hardware: (not used)
                OS: All OS
            Status: NEW
          Severity: Medium
          Priority: (field not used)
         Component: Numerical Math
          Assignee: bugzilla.admin at scilab.org
          Reporter: sgougeon at free.fr

BUG DESCRIPTION:
----------------
--> imax = uint64(%inf)
 imax  = 
  18446744073709551615      // OK


--> x=2^64-1
 x  = 
   1.845D+19                // OK

--> x<=imax
 ans  =
  T                         /// OK

--> uint64(x)
 ans  =
  9223372036854775808       // BUG

--> uint64(x)==imax/2
 ans  =
  T                         // !


ERROR LOG:
----------
none. Wrong behavior

HOW TO REPRODUCE THE BUG:
-------------------------
imax = uint64(%inf)
x = 2^64-1
x <= imax
uint64(x)
uint64(x)==imax/2

OTHER INFORMATION:
------------------
This bug has complicated a lot the design of the unit tests
test_run compatibility_functions mtlb_int_uint

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