DMD optimization bug?

[Jacob Carlborg]

On 2013-03-21 22:46, Iain Buclaw wrote:
> On 21 March 2013 20:29, Jacob Carlborg <doob at me.com
> <mailto:doob at me.com>> wrote:
>
>     The code below works fine without optimizations. But with
>     optimizations (the -O flag) turned on it segfaults. The behavior
>     with optimizations turned on is a bit different depending on which
>     version of DMD I try and if I compile for 32 or 64bit.
>
>     DMD 2.062 64bit: Segfault
>     DMD 2.062 32bit: Prints a huge array then segfault
>     DMD 2.061 64bit: Segfault
>     DMD 2.061 32bit: Prints a fairly small array (10 elements) with
>     random numbers
>     DMD head (7dcc72a997) 32bit: Bus error: 10
>
>     I'm using Mac OS X 10.8.2.
>
>     import std.stdio;
>
>     int[]* getDeserializedSlice ()
>     {
>          void[] a = [1, 2, 3, 4, 5].dup;
>          auto b = &a;
>
>          if (auto c = b)
>              auto d = &(cast(int[]) *c)[1 .. 1 + 2];
>
>          return null;
>     }
>
>     void main ()
>     {
>          writeln(*getDeserializedSlice(__));
>     }
>
>     Is the above code supposed to work? The test case might look a bit
>     strange, the full source code is here:
>
>     https://github.com/jacob-__carlborg/orange/blob/master/__orange/serialization/__Serializer.d#L1672
>     <https://github.com/jacob-carlborg/orange/blob/master/orange/serialization/Serializer.d#L1672>
>
>     --
>     /Jacob Carlborg

Crap, that example was incorrect, it should look like this:

return &(cast(int[]) *c)[1 .. 1 + 2];

-- 
/Jacob Carlborg