Re: [Tinycc-devel] Retargeting TCC to a 8bit device

[uso ewin]

I don't think there is any IRC channel for tinycc, but because I'd
like to have one too,
I've just joined #tinycc on freenode, so if you want you can join too ?

On Fri, Nov 13, 2020 at 6:19 AM Bill Gaylord <chibill110@gmail.com> wrote:
>
> Question is there like an IRC channel for TinyCC where its easier to ask 
> questions as I try and port then over email on the mailing list?
>
> Also is there documentation on all the if defs that exist for deciding what 
> is supported and stuff like that? For example the arm backend has TCC_ARM_VFP 
> to see if it is compiling for ARM with a VFP.
>
> On Tue, Nov 10, 2020 at 11:25 PM Christian Jullien <eligis@orange.fr> wrote:
>>
>> With a friend of mine, we tried a POC with z80 this year to see how it goes.
>>
>> While feasible, there is a great amount of work. For our POC, instead of 
>> generating .o which changes from target platform, we generated .asm and use 
>> the platform assembler, linker …
>>
>> We also choose to generate only 16bit register operations either with 8bit 
>> register pairs or using pseudo-register variables.
>>
>> Our approach was to create a lot of macros and ask tcc to call the macros 
>> instead of real z80 code. The macros could be viewed as an ideal 8bit 
>> processor VM machine having 3 or 4 general purpose 16bit registers. This was 
>> the idea.
>>
>> This way, having a 6802, 6809 compiler requires only to write macro for it 
>> and use machine dependent tools for code generation, linking and debugging.
>>
>> After around 3 or 4 weeks, we were able to generate few .COM samples on CP/M 
>> emulator.
>>
>>
>>
>> From: Tinycc-devel [mailto:tinycc-devel-bounces+eligis=orange.fr@nongnu.org] 
>> On Behalf Of Bill Gaylord
>> Sent: Tuesday, November 10, 2020 21:29
>> To: tinycc-devel@nongnu.org
>> Subject: [Tinycc-devel] Retargeting TCC to a 8bit device
>>
>>
>>
>> I am wondering if anyone has had an experience retargeting TCC to a 8bit 
>> micro or cpu? I am working on a homebrew CPU (have an emulator need to work 
>> on the hardware.) and I want to be able to write C code for it instead of 
>> just pure assembly.
>>
>>
>>
>> My only concern so far with looking at how to retarget it myself is that TCC 
>> needs you to have floating point available.  Or am I just reading the 
>> document incorrectly?
>>
>>
>>
>> Also I am wondering if I could not support some features of C in TCC. (For 
>> example. I literally can't do a long without using up 4 registers per number.
>>
>>
>>
>> Also any pointers would be appreciated.
>>
>>
>>
>> William Gaylord
>>
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>> Tinycc-devel@nongnu.org
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>
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