• Temtaime (4/4) Aug 10 2013 Hello for all!
• bearophile (6/8) Aug 10 2013 D is a system language, and registers are there to be used. What
• Temtaime (4/4) Aug 10 2013 I'm writing some ASM code in my function.
• bearophile (9/13) Aug 10 2013 dmd saves some registers before the asm code, and then restores
• Temtaime (2/2) Aug 10 2013 Now it's clear.

"Temtaime" <temtaime gmail.com> writes:

Hello for all!

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

Regards.

"bearophile" <bearophileHUGS lycos.com> writes:

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

"Temtaime" <temtaime gmail.com> writes:

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?

"bearophile" <bearophileHUGS lycos.com> writes:

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

"Temtaime" <temtaime gmail.com> writes:

Now it's clear.
Thanks very much!