dmd 1.053 and 2.037 release

[Walter Bright]

Don wrote:
> Yeah. Actually the CPU problem is an accepts-invalid bug. It worked on 
> my Pentium M, but it shouldn't have.
> The problem is what DMD does to the "uninitialized assignments".
> 
> float x;
> 
> gets changed into
> 
> float x = double.snan;
> 
> and is implemented with
> fld float.snan; fstp x;
> 
> The FLD is triggering the snan. They should be changed into mov EAX, 
> reinterpret_cast<int>(float.snan); mov x, EAX;

Sounds like a good idea.

> There's another reason for doing this. On Pentium 4, x87 NaNs are 
> incredibly slow. More than 250 cycles!!! On AMD and on Pentium 4 SSE2, 
> they are the same as any other value (about 0.5 cycles). Yet another 
> reason to hate the P4. But still, this is such a horrific performance 
> killer that we ought to avoid it.

I had no idea that was the case!