Re: [Qemu-devel] [PATCH 1/2] target-m68k: add 64bit mull

[Richard Henderson]

On 10/29/2016 02:36 AM, Laurent Vivier wrote:
> Le 29/10/2016 à 01:25, Richard Henderson a écrit :
> > On 10/28/2016 03:39 PM, Laurent Vivier wrote:
> > > +        tcg_gen_movi_i32(QREG_CC_V, 0);
> > > +        tcg_gen_mov_i32(QREG_CC_C, QREG_CC_V);
> >
> > movi CC, 0
>
> Just to know, could you explain why it is better?

They're independent sets?

The tcg optimizer *ought* to propagate the constant, but there's no reason to 
force this to happen there.


r~