Improving codegen for ARM Cortex-M

[Mike Franklin]

On Friday, 20 July 2018 at 11:11:12 UTC, Mike Franklin wrote:

> I ask for any insight you might have, should you wish to give 
> this your attention.  Regardless, I'll keep investigating.

Just to follow up, after I enabled `-funroll-loops` for GDC, it 
was almost twice as fast as LDC, though the code size was a 
little larger.

Bottom line is:  I just need to learn the compilers better (both 
of them) and learn how to tune them for the application.

Mike