Re: [Qemu-devel] [5100] SH4: Convert register moves to TCG

[Aurelien Jarno]

On Thu, Aug 28, 2008 at 11:13:42PM +0100, Paul Brook wrote:
> On Thursday 28 August 2008, Aurelien Jarno wrote:
> > +static always_inline void gen_movl_T_rN (TCGv t, int reg)
> > +{
> > +    tcg_gen_st_tl(t, cpu_env, offsetof(CPUState, gregs[reg]));
> 
> The preferred way of doing this is to have TCG variables for common (possibly 
> all?) registers. See e.g. m68k or sparc.
> 

Until now I have used MIPS as an example, it copies CPU registers to TCG
variables. As you pointed, m68k and sparc use direct access to CPU
registers through TCG variables.

I wonder in which way what your propose is better? It seems easier to write,
but what about the runtime speed?

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