* [Buildroot] Am I using hardware floating? (CodeBench)
@ 2013-09-21 15:24 Woody Wu
2013-09-22 8:37 ` Thomas Petazzoni
0 siblings, 1 reply; 5+ messages in thread
From: Woody Wu @ 2013-09-21 15:24 UTC (permalink / raw)
To: buildroot
Hi,
The toolchain I selected is codebench from buildroot. CPU is ARM
s3c2416. I want to know what kind of floating method is used in my
system. Does this related to BR?
Thanks in advance.
--
I can't go back to yesterday - because I was a different person then
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Buildroot] Am I using hardware floating? (CodeBench)
2013-09-21 15:24 [Buildroot] Am I using hardware floating? (CodeBench) Woody Wu
@ 2013-09-22 8:37 ` Thomas Petazzoni
2013-09-22 15:18 ` Woody Wu
0 siblings, 1 reply; 5+ messages in thread
From: Thomas Petazzoni @ 2013-09-22 8:37 UTC (permalink / raw)
To: buildroot
Dear Woody Wu,
On Sat, 21 Sep 2013 23:24:45 +0800, Woody Wu wrote:
> The toolchain I selected is codebench from buildroot. CPU is ARM
> s3c2416. I want to know what kind of floating method is used in my
> system. Does this related to BR?
The S3C2416 is an ARM926, and it does not have a floating point unit,
so your only solution is to use software floating point on this
platform.
Thomas
--
Thomas Petazzoni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Buildroot] Am I using hardware floating? (CodeBench)
2013-09-22 8:37 ` Thomas Petazzoni
@ 2013-09-22 15:18 ` Woody Wu
2013-09-23 7:28 ` Thomas Petazzoni
0 siblings, 1 reply; 5+ messages in thread
From: Woody Wu @ 2013-09-22 15:18 UTC (permalink / raw)
To: buildroot
On Sun, Sep 22, 2013 at 10:37:29AM +0200, Thomas Petazzoni wrote:
> Dear Woody Wu,
>
> On Sat, 21 Sep 2013 23:24:45 +0800, Woody Wu wrote:
>
> > The toolchain I selected is codebench from buildroot. CPU is ARM
> > s3c2416. I want to know what kind of floating method is used in my
> > system. Does this related to BR?
>
> The S3C2416 is an ARM926, and it does not have a floating point unit,
> so your only solution is to use software floating point on this
> platform.
>
> Thomas
Okay, understand. For software floating, I know there are two ways, one
is to generating an interrupt every time a floating instruction is
executed, which is very slow. And, another way is let the compiler to
convert all floating calculation to a function call which implemented in
a floating library, this method is a little faster than the former. My
compiler is CodeBench from BR, does it have this feature and has it
already enabled? Thank you very much.
> --
> Thomas Petazzoni, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
--
I can't go back to yesterday - because I was a different person then
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Buildroot] Am I using hardware floating? (CodeBench)
2013-09-22 15:18 ` Woody Wu
@ 2013-09-23 7:28 ` Thomas Petazzoni
2013-09-24 12:48 ` Woody Wu
0 siblings, 1 reply; 5+ messages in thread
From: Thomas Petazzoni @ 2013-09-23 7:28 UTC (permalink / raw)
To: buildroot
Dear Woody Wu,
On Sun, 22 Sep 2013 23:18:40 +0800, Woody Wu wrote:
> Okay, understand. For software floating, I know there are two ways,
> one is to generating an interrupt every time a floating instruction is
> executed, which is very slow. And, another way is let the compiler to
> convert all floating calculation to a function call which implemented
> in a floating library, this method is a little faster than the
> former. My compiler is CodeBench from BR, does it have this feature
> and has it already enabled? Thank you very much.
Yes, the Sourcery CodeBench toolchain for ARM uses soft-float for its
ARMv5 multilib variant, which gets used if you select the arm926
processor type in Buildroot.
Thomas
--
Thomas Petazzoni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Buildroot] Am I using hardware floating? (CodeBench)
2013-09-23 7:28 ` Thomas Petazzoni
@ 2013-09-24 12:48 ` Woody Wu
0 siblings, 0 replies; 5+ messages in thread
From: Woody Wu @ 2013-09-24 12:48 UTC (permalink / raw)
To: buildroot
? 2013-9-23 PM3:28?"Thomas Petazzoni" <thomas.petazzoni@free-electrons.com
>???
>
> Dear Woody Wu,
>
> On Sun, 22 Sep 2013 23:18:40 +0800, Woody Wu wrote:
>
> > Okay, understand. For software floating, I know there are two ways,
> > one is to generating an interrupt every time a floating instruction is
> > executed, which is very slow. And, another way is let the compiler to
> > convert all floating calculation to a function call which implemented
> > in a floating library, this method is a little faster than the
> > former. My compiler is CodeBench from BR, does it have this feature
> > and has it already enabled? Thank you very much.
>
> Yes, the Sourcery CodeBench toolchain for ARM uses soft-float for its
> ARMv5 multilib variant, which gets used if you select the arm926
> processor type in Buildroot.
>
Many thanks Thomas!
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2013-09-21 15:24 [Buildroot] Am I using hardware floating? (CodeBench) Woody Wu
2013-09-22 8:37 ` Thomas Petazzoni
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2013-09-23 7:28 ` Thomas Petazzoni
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