Gentle reminder
From: Singh, Ravi Kumar (Ravi)
Sent: Thursday, May 03, 2012 3:33 PM
To: Ramana Radhakrishnan
Cc: Ulrich Weigand; linaro-toolchain
Subject: RE: Vectorization paper / kernels.
Ramana,
Can you suggest the flags used for optimal vectorization on A15 using GNU GCC
4.7.
Perhaps specific optimization flags for A15 would also help
regards
RKSingh
From: Ramana Radhakrishnan [ramana.radhakrish...@linaro.org]
Sent: Thursday, May 03, 2012 3:03 PM
To: Singh, Ravi Kumar (Ravi)
Cc: Ulrich Weigand; linaro-toolchain
Subject: Re: Vectorization paper / kernels.
On 3 May 2012 19:30, Singh, Ravi Kumar (Ravi) wrote:
> Actually its not hanging, I tried to run it in isolation.
>
> Without VectorizationWith Vectorization
> Time Value Time Value
> S1115 67.98 0.065529 1186.440.065536
>
>
> That means degradation of -1645.28%
Sounds to me like vectorization might have gone awry - What happens if
you use something like -fvect-cost-model ? Does that make any
difference ? It sounds to me like a pathological runaway vectorization
which might have resulted in massive spills causing such a regression.
For the record this was just a pointer to a paper that might be of
interest . I haven't really investigated the kernels to see how useful
they really are :) .
regards,
Ramana
>
> Regards
> RKS
> -Original Message-
> From: Ramana Radhakrishnan [mailto:ramana.radhakrish...@linaro.org]
> Sent: Thursday, May 03, 2012 12:38 PM
> To: Singh, Ravi Kumar (Ravi)
> Cc: Ulrich Weigand; linaro-toolchain
> Subject: Re: Vectorization paper / kernels.
>
> On 30 April 2012 15:10, Singh, Ravi Kumar (Ravi) wrote:
>> Ramana,
>>
>> My tests S115 is hanging in the vectorized version of TSVC benchmark.
>
> Thanks for trying it out - I hadn't really tried it out when I had
> sent the mail. Uli is planning to look into these in the next few
> days.
>
> Ramana
>
>>
>> Regards
>> RKS
>>
>> -Original Message-
>> From: linaro-toolchain-boun...@lists.linaro.org
>> [mailto:linaro-toolchain-boun...@lists.linaro.org] On Behalf Of Ramana
>> Radhakrishnan
>> Sent: Monday, April 30, 2012 3:44 AM
>> To: Ulrich Weigand
>> Cc: linaro-toolchain
>> Subject: Vectorization paper / kernels.
>>
>> Hi Uli,
>>
>> While looking into something else I ran into these - I wonder how many
>> of these GCC manages to vectorize ...
>>
>> http://www.netlib.org/benchmark/livermorec . These look interesting
>> from a vectorizer kernels point of view.
>>
>> The other interesting paper of note was this PACT paper on
>> vectorization benchmarks comparing icc , xlc and GCC which might
>> provide some interesting hints / reading.
>> http://polaris.cs.uiuc.edu/~garzaran/doc/pact11.pdf . The appropriate
>> benchmarks kernels are linked to below.
>>
>> http://polaris.cs.uiuc.edu/ ̃maleki1/TSVC.tar.gz.
>>
>>
>> regards,
>> Ramana
>>
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