Re: [Tinycc-devel] Question about adding new instruction

[grischka]

On 18.08.2023 12:41, Jens Nyberg wrote:
> Hi!
>
> I have two questions really:
>
> 1, I am thinking of adding the "ltrw" instuction to i386. I see there is 
> already an ltr instruction so there might be good reason you don't have the w-variant? In 
> any case how would I add it properly? Would adding a line like this be ok or do I need to 
> do something else as well?
>
> DEF_ASM_OP1(ltrw, 0x0f00, 3, OPC_MODRM, OPT_EA | OPT_REG)

IIRC there is some mechanism to handle b/w/l suffixes more or less
automatically.  You need to see whether you could use that or better
just add a separate instruction.

> 2. Is there a reason why the .extern keyword is not recognized by the assembler?

According to the gnu as docs it is ignored, so no,  I don't see a reason
why tcc couldn't just ignore it too.

-- gr

> Thank you!
>
>   / Jens
>
>
> _______________________________________________
> Tinycc-devel mailing list
> Tinycc-devel@nongnu.org
> https://lists.nongnu.org/mailman/listinfo/tinycc-devel