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Re: [Discuss-gnuradio] Performance on ARM Cortex-A8

From: Riadh Elloumi
Subject: Re: [Discuss-gnuradio] Performance on ARM Cortex-A8
Date: Mon, 18 Jul 2011 17:21:04 +0200

Hi all,

Thank you for your help.

After deeper investigation, software emulated FP is performed form the
GNU libsdtc++ because it is compiled with software FP and does some
arithmetics on complex (add, multiply) which are struct of floats.

I will recompile libstdc++ with hard FP and measure again the

Best regards,


On Fri, 2011-07-15 at 21:47 +0100, Marcus D. Leech wrote:
> On 07/15/2011 04:42 PM, Philip Balister wrote:
> >
> > From a quick look at Tom's oprofile results, first find out who is 
> > calling into libm and see if you can change the block to stopp calling 
> > libm. For example, calculate sin/cos via a table approximation (I 
> > think GNU Radio already does that).
> I think libm already does that, too (table-based SIN/COS), not sure.

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