foreach_bit

[Kulakov, Igor]

Hi Matthias,

one more thing, which disturbs me for a long time:

why Vc doesn't provide standard functions fabs(float ) (it has abs(float ) instead) and sign(float )?
As for me will be more convenient to have for both float_v and float all functions with same names.

Regards,
Igor

On Aug 14, 2012, at 2:24 AM, Matthias Kretz wrote:

> Hi,
> 
> at least GCC nicely optimizes my solution, so I made it available in the 
> master branch. (BTW, also Vc::Scalar failed with break: it resulted in an 
> infinite loop.)
> 
> Feel free to switch to the master branch for your work for now. I'm working 
> towards an 0.7 release with this branch (hopefully this month).
> 
> Regards,
>  	Matthias
> 
> On Monday 13 August 2012 09:03:45 Matthias Kretz wrote:
>> On Thursday 09 August 2012 20:32:27 Kulakov, Igor wrote:
>>> Is this possible to break foreach_bit() like any other loop?
>>> 
>>> I mean something like:
>>> float_v a = ...;
>>> Vc_foreach_bit(int i, a < 0.f) {
>>> 
>>>   std::cout << a[i] << "\n";
>>>   if (a[i] > 0) break;
>>> 
>>> }
>> 
>> Good question. No, at least it's not guaranteed to work (it'll surely work
>> with the Vc::Scalar :) ). I have an idea how it could be implemented, but
>> I'll have to check how well the compilers optimize it.
>> ,
>> Feel free to open a ticket at code.compeng.uni-frankfurt.de .
>> 
>> Background: Vc_foreach_bit is implemented as two nested for loops. Thus a
>> break statement will only break out of the inner loop. This is has the same
>> effect as a continue statement then.
>> 
>> Regards,
>>  	Matthias
> -- 
> Dipl.-Phys. Matthias Kretz
> http://compeng.uni-frankfurt.de/?mkretz
> 
> SIMD easy and portable: http://compeng.uni-frankfurt.de/?vc
> 
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