[fpc-devel] Bug with R+ and assembler functionsHi,

[Peter Vreman]

> Jonas Maebe wrote:
>
>> No, in eax. "movl %eax, %esi" means "move the contents of eax into esi".
>> This is AT&T assembler notation, not Intel.
>
> ops, i worked 10 years with intel assembler style, so i mixed this. sorry.
>
>> No. At least one problem is that in your assembler function, you use esi
>> and ebx without saving/restoring them. ebx, esi and edi are callee-saved
>> registers in the new default calling convention of FPC 2.0 (register
>> calling), just like in C/C++.
>
> Is there any docmentation about this? Must the eax register be saved,
> too? I thouht
>
> end ['EAX', 'EBX', 'ESI'];
>
> Is enough and tells the compiler, that these registers are changeing. In
> the current documentation i could not found information, about saving
> registers.

That works only for assembler blocks inside functions. For functions
itself the standard calling conventions need to be followed. For i386
these are the same as delphi.