Re: [Qemu-devel] [PATCH 5/8] tcg: Add interpreter for bytecode

[Avi Kivity]

On 09/19/2011 09:52 AM, Andi Kleen wrote:
> >  I think it also improves branch target prediction - if you have a tight
> >  loop of a few opcodes the predictor can guess where you're headed (since
> >  there is a separate lookup key for each opcode), whereas with the
> >  original code, there's a single key which cannot be used to predict the
> >  branch target.
>
> At least usually. I caught at least one version of gcc to CSE the jump
> instruction into a common location in one of my interpreters
> :-( But not all do it at least, and I hope gcc gets fixed.

You generally want CSE, yes?  So you can't blame gcc for getting it 
wrong sometimes.

--
error compiling committee.c: too many arguments to function