dmd codegen improvements

[Dmitry Olshansky via Digitalmars-d]

On 29-Aug-2015 01:05, Walter Bright wrote:
> On 8/28/2015 9:49 AM, Dmitry Olshansky wrote:
>> Have you ever written a backend? What is the evidance?
>>
>> Consider that x86 x64 bit support was done in about one year and a
>> half by
>> Walter single-handedly that is without freezing the other activity on
>> DMD, of
>> course. Aside from emitting different sequences of instructions most
>> IR-based
>> optimizations stay the same.
>
> Doing an ARM back end wouldn't be that hard. It's much less complex than
> x86. Most of the work would be deleting about half of the x86 code
> generator :-)
>

Yeah, I guess the things to provision for is register count + some 
peculiarities of allowed moves/stores etc.

Doing the first 64-bit codegen was a difficult task, compared to doing 
another 32-bit one.

-- 
Dmitry Olshansky