Re: DMD CTFE Bug?

[Dmitry Olshansky]

On 17-Aug-12 20:40, David wrote:
Am 17.08.2012 18:36, schrieb Dmitry Olshansky:
On 17-Aug-12 20:27, David wrote:
I have this code: http://dpaste.dzfl.pl/dbe2a07f
It works perfectly fine, except for `t!(2, 10)` and `t!(1, 10)`:

// Expected:
[Vertex(-0.5, 0.5, 0.5, 0, 1, 0, 2, 10, 2, 10, 0, 0), Vertex(0.5, 0.5,
0.5, 0, 1, 0, 3, 10, 3, 10, 0, 0), Vertex(0.5,  0.5, -0.5, 0,  1, 0, 3,
9, 3, 9, 0, 0),
  Vertex(-0.5, 0.5, 0.5, 0, 1, 0, 2, 10, 2, 10, 0, 0), Vertex(0.5, 0.5,
-0.5, 0, 1, 0, 3, 9, 3, 9, 0, 0), Vertex(-0.5, 0.5, -0.5, 0, 1, 0, 2, 9,
2, 9, 0, 0)]

// Actual result:
[Vertex(-0.5, 0.5, 0.5, 0, 1, 0, 2, 10, 2, 10, 0, 0), Vertex(0.5, 0.5,
0.5, 0, 1, 0, 3, 10, 3, 10, 0, 0), Vertex(0.5, -0.5,  0.5, 0, -1, 0, 6,
3, 6, 3, 0, 0),
  Vertex(-0.5, 0.5, 0.5, 0, 1, 0, 2, 10, 2, 10, 0, 0), Vertex(0.5, 0.5,
-0.5, 0, 1, 0, 3, 9, 3, 9, 0, 0), Vertex(-0.5, 0.5, -0.5, 0, 1, 0, 2, 9,
2, 9, 0, 0)]

If I change `enum` in line 117 to `auto` it produces the expected
result.

Any ideas why this happens?

Bug. There is no excuse for compiler to get different result during CTFE.

Great ...

(Btw. I wasn't able produce a smaller testcase)
It's not thousands of lines either. But where does Vertex type comes
from?

struct Vertex {
     float x;
     float y;
     float z;
     float nx;
     float ny;
     float nz;
     byte u_terrain;
     byte v_terrain;
     byte u_mask;
     byte v_mask;
     float u_biome;
     float v_biome;
}


Well then I think all you have to do is to put together the complete 
sample and file it as CTFE bug here:
http://d.puremagic.com/issues/

--
Olshansky Dmitry