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Re: [avr-gcc-list] AVR-GCC internals.

From: Jonathan Blanchard
Subject: Re: [avr-gcc-list] AVR-GCC internals.
Date: Thu, 12 Jun 2008 15:00:15 -0300

Thank you for the answer. So the back-end is the only thing that
differ between AVR-GCC and any other port?

Jonathan Blanchard

On Thu, Jun 12, 2008 at 2:49 PM, Weddington, Eric
<address@hidden> wrote:
>> -----Original Message-----
>> From:
>> address@hidden
>> [mailto:address@hidden
>> org] On Behalf Of Jonathan Blanchard
>> Sent: Thursday, June 12, 2008 8:29 AM
>> To: address@hidden
>> Subject: [avr-gcc-list] AVR-GCC internals.
>> I'm a bit curious about two thing. First who or what organization was
>> responsible for the initial creation of the AVR port of GCC.
> Denis Chertykov was responsible for creating the original AVR port of
> GCC. IIRC, Denis and Marek Michalkiewicz were the original authors of
> avr-libc. I could be slightly mixed up and that it was Denis and Marek
> responsible for the AVR port of GCC and Marek responsible for avr-libc.
> Anyways, right now it is still based on volunteer developers.
>> Secondly, I was browsing the mailing list and seen various discussion
>> about the AVR back end. What are the differences between the inner
>> working of AVR-GCC and the other GCC port. I mean is parsing,
>> optimization and code generation done the same way as other GCC port?
> See the GCC documentation,
> <http://gcc.gnu.org/onlinedocs/>
> specifically the GCC Internals Manual:
> <http://gcc.gnu.org/onlinedocs/gccint/>
> The "front-end" of GCC is per language compiler. So there is a C
> front-end, a C++ front-end, Ada front-end, Java front-end, Fortran
> front-end, etc.
> <http://gcc.gnu.org/frontends.html>
> The "back-end" of GCC is per device or platform (OS + device). The AVR
> is just one back-end of many. This should give you a rough idea of just
> how many:
> <http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Submodel-Options.html#Submo
> del-Options>
> The front-end parses the language and creates an Intermediate Language
> (IL). The "middle-end" is then responsible for the various compiler
> passes and general optimization. The "back-end" does all the machine
> specific optimization and generates machine-specific assembly language.

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