On Mon, Oct 19, 2015 at 12:05:29PM +0100, Chris Wilson wrote:
> In order to add the clobbers, I had to adjust the macro slightly:
>
> +#define alternative_output(oldinstr, newinstr, feature, output) \
> + asm volatile (ALTERNATIVE(oldinstr, newinstr, feature) \
> + : output : "i" (0) : "memory")
>
> and that also works. The concern I have here is that the asm does use
> "+m" as its output already, and the clflush() asm doesn't require the
> manual clobber.
Yeah, you could make the above
#define alternative_output(oldinstr, newinstr, feature, output, clobber...)
and use it to define clflushopt(). hpa might have a better idea, though...
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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