[fpc-devel] ARM4 and THUMB instruction sets

[Yury Sidorov]

From: "Daniël Mantione" <daniel.mantione at freepascal.org>
> Op Wed, 17 Oct 2007, schreef Felipe Monteiro de Carvalho:
> > so it may be useful to see of
> > we can easely support thumb. Since we always use an external 
> > assembler
> > for arm, I wounder: Wouldn't be supporting arm4/thumb just a 
> > question
> > of switching a switch when calling the assembler?
>
> No, thumb assembler code is different from generating normal 
> assembler
> code. You need serious code generator modifications.

Even worse. Thumb is completely different instruction set with 
different number of registers. Completely new code generator is needed 
for thumb.

Yury.