On Thu, Sep 10, 2020 at 03:31:53PM +0000, David Laight wrote:
> > > asm volatile ("" : "+r" (eax));
> > > // So here eax must contain the value set by the "xxxxx" instructions.
> >
> > No, the register eax will contain the value of the eax variable. In the
> > asm; it might well be there before or after the asm as well, but none of
> > that is guaranteed.
>
> Perhaps not 'guaranteed', but very unlikely to be wrong.
> It doesn't give gcc much scope for not generating the desired code.
Wanna bet? :-)
Correct is correct. Anything else is not.
Segher
