Hello for all!

Which registers in IASM i must preserve?
http://dlang.org/iasm.html says nothing.

Regards.

Temtaime:

> Which registers in IASM i must preserve?
> http://dlang.org/iasm.html says nothing.

D is a system language, and registers are there to be used. What do you want to keep safe?

Take a look at the docs page about the D ABI.

Bye,
bearophile

I'm writing some ASM code in my function.

Does it mean that DMD saves "his" registers before my asm code and restores after? So i can use all registers without interaction with code that DMD backend produces?

Temtaime:

> I'm writing some ASM code in my function.
>
> Does it mean that DMD saves "his" registers before my asm code and restores after? So i can use all registers without interaction with code that DMD backend produces?

dmd saves some registers before the asm code, and then restores them after your asm. If you don't want that behavour then you have to use the "naked" attribute.

For details of what registers can be used take a look at the docs. And also take a look at the disassembly of your function that contains an empty asm statement, to see exactly what's saved.

Bye,
bearophile

Now it's clear.
Thanks very much!