New in gcc compiler develment

[Georg-Johann Lay]

Am 16.01.20 um 10:36 schrieb Henri Cloetens:
> Hello all,
> 
> I am starting to work on GCC backend development. I have some issues 
> right now,
> if any of you could help me on that.
> 
> 1. I managed to compile my backend, and run a simple program through it. 
> However,
>  Â Â  - It is using a frame pointer. (It does not eliminate it.)

Maybe some elimination rules missing?

https://gcc.gnu.org/onlinedocs/gccint/Elimination.html

>  Â Â  - Arguments of functions are declared in registers, but at the start 
> of the subroutine,
>  Â Â Â Â  it puts the arguments on the stack.

You compiled with optimization turned on? Or taking addresses of 
parameters?  We can only guess here.

>  Â Â  - I think it is related with DWARF2 debug format, I tried to disable 
> it, but could not find it.
> 
> 2. Is there a way to get verbose messages out of the compiler, to help 
> during debug ?.

You can -fdump-rtl-all (or -da) and check if stuff is expanded and 
transformed as expected during the RTL passes.  There are more fine 
grained add additional flags apart from -all

https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html

Johann

> 3. Is there some manual/description on how to run the compiler 
> verification suites ?.
> 
> Best Regards,
> 
> Henri.