[PATCH][MC/X86_64] Implement Win64 exception handling

[Nico Rieck]

On 22.11.2013 18:06, Kai Nacke wrote:
> My understanding is that LEA instructions to adjust the stack pointer
> are invalid in prolog code. But I recheck in MSDN.

Hm. I can't find anything that explicitly forbids this. If it's a simple 
LEA like "leaq -48(%rsp), %rsp" an alloc unwind code should be fine.

>> Have you planned to fix PR16779, too?
>
> Well, only if I find a good solution. (I already tried but had no success.)

My first impression was that the general principle (over-allocate and 
align later on) shouldn't be too difficult to, though the prolog 
generating code is quite complex already. Did you stumble upon other 
problems?

-Nico