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) <ravi.si...@lsi.com> wrote: > Actually its not hanging, I tried to run it in isolation. > > Without Vectorization With Vectorization > Time Value Time Value > S1115 67.98 0.065529 1186.44 0.065536 > > > 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) <ravi.si...@lsi.com> 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 >> >> _______________________________________________ >> linaro-toolchain mailing list >> linaro-toolchain@lists.linaro.org >> http://lists.linaro.org/mailman/listinfo/linaro-toolchain _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain
