http://d.puremagic.com/issues/show_bug.cgi?id=5672

           Summary: Internal error: ..\ztc\cod2.c 461
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: spam@extrawurst.org


--- Comment #0 from Stephan Dilly <spam@extrawurst.org> 2011-03-01 06:12:32 PST ---
enum Foo : ulong //remove the :ulong and the internal error is gone
{
    baa = 0B_001,
}

void bitfieldToStrings(T)(T _val)
{
    string[] res;

    foreach(mem; __traits(allMembers, T))
    {
        if( (_val & 1) == 1 )
        {
            res ~= "foo";
        }
    }
}

void main(string[] argv)
{
    Foo bar;

    bitfieldToStrings(bar);
}


Just happens when compiled with : dmd main.d -O
Tested with dmd 2.051 and 2.052

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug@yahoo.com.au
            Version|D2                          |D1 & D2
            Summary|Internal error:             |ICE(cod2.c): if ((long &1)
                   |..\ztc\cod2.c 461           |== 1) with -O


--- Comment #1 from Don <clugdbug@yahoo.com.au> 2011-03-01 07:38:38 PST ---
Reduced test case:

void foo5672() {}

void bug5672(long v)
{
    if( (v & 1) == 1 )
    {
        foo5672();
    }
}


Prehistoric bug. Same ICE on DMD 0.140.

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ICE(cod2.c): if ((long &1)  |ICE(cod2.c): incorrect
                   |== 1) with -O               |optimization of (long &1)
                   |                            |== 1


--- Comment #2 from Don <clugdbug@yahoo.com.au> 2011-03-01 17:06:17 PST ---
Completely reduced test case:
----
bool bug5672(long v)
{
    return  (v & 1) == 1;
}
----
It's happening because in cgelem.c, elcmp(), around line 3350,
  bool  = (long & 1) == 1;
gets optimized into
  bool = long & 1;
Setting the new size of the long expression isn't done correctly.

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