Re: [Qemu-devel] [patch] gcc4 host support

[Gwenole Beauchesne]

Le mercredi, 18 mai 2005, à 22:48 Europe/Paris, Paul Brook a écrit :

> It's been said before that the long-term solution is to 
> [incrementally] remove
> dyngen altogether, and replace it with a had-written code generator.
> I've discussed this in a bit more detail with Fabrice, and have an
> almost-working prototype implementation. When I get something that 
> actually
> works I'll post it to the list for comments.

Have you considered the VEX library? I have not tried it yet but it 
looks promising. However, since it aims at providing a common IR, it 
can miss certain optimizations related to condition codes (at least as 
ppc guest).

BTW, since dyngen-based JIT is fast enough both at compile time and at 
run time, it could be used to gather stats for a higher optimizing JIT 
(VEX or whatever). e.g. profiling branches in order to optimize hot 
traces, providing hints for indirect branches, etc.