Does D (DMD/Win) use ES, FS & GS for anything?

[Walter Bright]

Me Here wrote:
> The subject pretty much says it all. I'd like to use one (or if possible, two)
> of these registers in some assmbly code and want to know if I need to preserve
> them or if D will just ignore them and leave them untouched between callbacks
> into the assembler code?

I recommend save/restoring them. GS, for example, is used in Linux for 
thread local storage. FS is used for exception handling. ES is used for 
string instructions.