Conversion between different types on IA-64

Conversion between different types on IA-64

[CH Gowri Kumar]

Hi all,
Can anyone point me to a source of how to convert from a 
wider size to narrow size (long to int, int to char etc.) on IA-64?

For the other way round(narrow to wider), I could find SXT(sign extend) 
and ZXT(zero extend) instructions.

gcc seems(but not sure) to be storing the original value and loading it 
using the appropriate LD* instruction.

I am sorry if it's a too trivial question to be asked on this list.

Regards,
Gowri Kumar

Re: Conversion between different types on IA-64

[Martin Pool]

On 30 Jul 2003, CH Gowri Kumar <gkumar@csa.iisc.ernet.in> wrote:
> Hi all,
> Can anyone point me to a source of how to convert from a 
> wider size to narrow size (long to int, int to char etc.) on IA-64?
> 
> For the other way round(narrow to wider), I could find SXT(sign extend) 
> and ZXT(zero extend) instructions.
> 
> gcc seems(but not sure) to be storing the original value and loading it 
> using the appropriate LD* instruction.

In C just a cast ought to do it.

In asm it seems like you can either ST and then LD4/LD2/LD1, or use
AND or EXTR.

Sorry if I'm misunderstanding your question.

-- 
Martin 

Re: Conversion between different types on IA-64

[CH Gowri Kumar]

Hi Martin,
> In C just a cast ought to do it.
OOPS! I should have asked it as "IA-64 assembly".

> In asm it seems like you can either ST and then LD4/LD2/LD1, or use
> AND or EXTR.
Seems the instructions extr and extr.u would do the work for signed 
and unsigned forms respectively.

Thanks for the help, Martin.

Regards,
Gowri Kumar