[Issue 11159] New: [CTFE] Integer exponentiation give incorrect values

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11159

           Summary: [CTFE] Integer exponentiation give incorrect values
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: CTFE, patch
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: safety0ff.bugz at gmail.com


--- Comment #0 from safety0ff.bugz at gmail.com 2013-10-02 16:31:54 PDT ---
Example program:

import std.stdio;
void main() {
    writeln("==== Runtime ====");
    ulong ten = 10, two = 2;
    writeln(two^^63);// ok
    writeln(two^^64);// overflows -> 2^64 % 2^64
    writeln(ten^^18);// ok
    writeln(ten^^19);// ok
    writeln(ten^^20);// overflows -> 10^20 % 2^64

    writeln("==== CTFE ====");
    enum ulong eten = 10, etwo = 2;
    writeln(etwo^^63);// ok
    writeln(etwo^^64);// expect an overflow, gives 2^63
    writeln(eten^^18);// ok
    writeln(eten^^19);// should work, gives 2^63 instead (2^63 > 10^19)
    writeln(eten^^20);// expect an overflow, gives 2^63
}

See attached patch for proposed fix.

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