Sign in
Search AT91SAM
Subscribe to AT91SAM
Ads
Discussion Groups
Discussion Groups | AT91SAM ARM | Float multiplication
For users of the Atmel AT91SAM7 and AT91SAM9 ARM CPU chips. Atmel has taken a new direction by combining on chip flash and ram with the ARM CPU on a single die. This provides low cost devices for small systems using the ARM CPU. This group is to exchange information to help users get started and learn how to use the devices.
Float multiplication - =?UTF-8?B?TWljaGHFgg==?= - Feb 19 16:15:59 2008
Hello,
I` am currently working on AT91SAM7S microcontroller. I am implementing
some simple DSP algorithms e.g. FIR filter. I am totally aware of the
fact that fixed point multiplication will by much faster due to the fact
that float operations are implemented in software. But for comparison
reasons I am curios how long (time or number of cycles) does it take to
multiply two float numbers using gcc software support.
I know that I could check this by measuring multiplication time but at
the moment I don’t have access to development board.
Michal
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
I` am currently working on AT91SAM7S microcontroller. I am implementing
some simple DSP algorithms e.g. FIR filter. I am totally aware of the
fact that fixed point multiplication will by much faster due to the fact
that float operations are implemented in software. But for comparison
reasons I am curios how long (time or number of cycles) does it take to
multiply two float numbers using gcc software support.
I know that I could check this by measuring multiplication time but at
the moment I don’t have access to development board.
Michal
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: Float multiplication - =?UTF-8?B?TWljaGHFgg==?= - Feb 19 16:47:30 2008
> Can't you just look at the ASM that is generated?
>
Good idea. I am using yagarto can you give me a clue how to do it?
Michal
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: Float multiplication - =?UTF-8?B?TWljaGHFgg==?= - Feb 19 16:56:48 2008
Mark Borgerson pisze:
>
>
>
>> -----Original Message-----
>> From: A...@yahoogroups.com
>> [mailto:A...@yahoogroups.com] On Behalf Of Michal
>> Sent: Tuesday, February 19, 2008 1:07 PM
>> To: A...@yahoogroups.com
>> Subject: [AT91SAM] Float multiplication
>>
>> Hello,
>>
>> I` am currently working on AT91SAM7S microcontroller. I am
>> implementing some simple DSP algorithms e.g. FIR filter. I am
>> totally aware of the fact that fixed point multiplication
>> will by much faster due to the fact that float operations are
>> implemented in software. But for comparison reasons I am
>> curios how long (time or number of cycles) does it take to
>> multiply two float numbers using gcc software support.
>>
>> I know that I could check this by measuring multiplication
>> time but at the moment I don't have access to development board.
>>
>>
> I ran a test some time ago with an AT91SAM7 running at 18.432MHz:
>
Thanks for this information. What was your MCK? I guess that 18.432 is
crystal frequency.
Michal
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
>
>
>
>> -----Original Message-----
>> From: A...@yahoogroups.com
>> [mailto:A...@yahoogroups.com] On Behalf Of Michal
>> Sent: Tuesday, February 19, 2008 1:07 PM
>> To: A...@yahoogroups.com
>> Subject: [AT91SAM] Float multiplication
>>
>> Hello,
>>
>> I` am currently working on AT91SAM7S microcontroller. I am
>> implementing some simple DSP algorithms e.g. FIR filter. I am
>> totally aware of the fact that fixed point multiplication
>> will by much faster due to the fact that float operations are
>> implemented in software. But for comparison reasons I am
>> curios how long (time or number of cycles) does it take to
>> multiply two float numbers using gcc software support.
>>
>> I know that I could check this by measuring multiplication
>> time but at the moment I don't have access to development board.
>>
>>
> I ran a test some time ago with an AT91SAM7 running at 18.432MHz:
>
Thanks for this information. What was your MCK? I guess that 18.432 is
crystal frequency.
Michal
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
RE: Float multiplication - HENK VISSER - Feb 19 17:21:45 2008
Can't you just look at the ASM that is generated?
To: A...@yahoogroups.com
From: s...@o2.pl
Date: Tue, 19 Feb 2008 22:07:01 +0100
Subject: [AT91SAM] Float multiplication
Hello,
I` am currently working on AT91SAM7S microcontroller. I am implementing
some simple DSP algorithms e.g. FIR filter. I am totally aware of the
fact that fixed point multiplication will by much faster due to the fact
that float operations are implemented in software. But for comparison
reasons I am curios how long (time or number of cycles) does it take to
multiply two float numbers using gcc software support.
I know that I could check this by measuring multiplication time but at
the moment I don’t have access to development board.
Michal
_________________________________________________________________
Connect and share in new ways with Windows Live.
http://www.windowslive.com/share.html?ocid=TXT_TAGHM_Wave2_sharelife_012008
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: Float multiplication - Pavel Bazika - Feb 23 5:34:32 2008
Dne Tuesday 19 of February 2008 22:38:39 Micha=C5=82 napsal(a):
> > Can't you just look at the ASM that is generated?
>
> Good idea. I am using yagarto can you give me a clue how to do it?
>
> Michal
Look here:
http://www.delorie.com/djgpp/v2faq/faq8_20.html
Pavel
=20
=20
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
> > Can't you just look at the ASM that is generated?
>
> Good idea. I am using yagarto can you give me a clue how to do it?
>
> Michal
Look here:
http://www.delorie.com/djgpp/v2faq/faq8_20.html
Pavel
=20
=20
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )