On 14-Mar 14:32, Peter Zijlstra wrote:

On Thu, Mar 14, 2019 at 12:13:15PM +0000, Patrick Bellasi wrote:

quoted

quoted

I'd be most impressed if they pull this off. Check the generated code
and see I suppose :-)

On x86 the code generated looks exactly the same:

   https://godbolt.org/z/PjmA7k

Argh, they do mult by inverse to avoid the division, and can do this
because its a constant.

And then yes, your arm version looks worse.

your "arm version" is worst then x86, or "your version" is worse?

IOW, should I keep the code as the original? Do you prefer your
version? Or... we don't really care...

It does what I expected with -Os, but as Rutland said the other day,
that stands for Optimize for Sadness.

Yes, I guess we cannot optimize for all flags... however, just let me
know what you prefer and I'll put that version in ;)

-- 
#include <best/regards.h>

Patrick Bellasi