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TL;DR This RFC is a joint effort by Intel and Saarland University to bring the divergence analysis of the Region Vectorizer [1,2,3,4,5] (dubbed the vectorization analysis of RV) to LLVM. The implementation is available on github for feedback [0]. The existing divergence analysis infrastructure in LLVM has conceptual limitations (structured control, SCEV based). The new analysis...

Hello, Yes? Where is allActive defined, I couldn't find it. Basically, a BB is control divergent if it's execution depends on a branch that itself depends on a divergent ssa value. On Fri, Jul 21, 2017 at 4:13 PM, Zaks, Ayal <ayal.zaks at intel.com> wrote: > What would be the definition of “isControlDivergent(BasicBlock*)”; the > complementary of “allActive(BasicBlock*)” –...

Hello, It seems to me that our current DivergenceAnalysis does not save which BasicBlocks may suffer from divergent control. Am I correct? I want to modify our DivergenceAnalysis to add a "bool isControlDivergent(BasicBlock*) const" method and save in the divergence propagator the basicblock that are divergent. I am not sure that is...

On 25.10.2016 16:28, Nicolai Hähnle wrote: > But I fear that this path leads to eternal fuzziness. Let me try a > completely different approach to define what we need by augmenting the > semantics of IR with "divergence tokens". In addition to its usual > value, every IR value carries a "divergence set" of divergence tokens. > > The basic rule is: the divergence set of a value is (at least) the union > of the divergence sets of its operands. > > Every function input carries a u...

Hi list! I have prepared a custom function (below) in order to calculate separability indices (Divergence, Bhattacharyya, Jeffries-Matusita, Transformed divergene) between two samples of (spectral land cover) classes. I need help to cross-compare results to verify that it works as expected (since I don't know of any other foss-tool that will give me quickly some results). Does anybody use...

...analysis does not run in the second pass manager because no metadata is generated at all. > > Could this be a bug in DA reporting the load falsely as uniform by not taking the intrinsics into account? > > Cheers, > Michael > The intrinsics certainly are correctly treated as divergent. Nothing would work otherwise. If I run the annotate pass or analysis on the examples it does the right thing and sees the load as divergent. $ opt -S -analyze -divergence -o - as1.ll Printing analysis 'Divergence Analysis' for function '_ZN5pacxx2v213genericKernelIZL12test_barrieri...

...>>>> 1) convergent: a call to a function with this attribute cannot be >>>> moved to have additional control dependencies; i.e., moving it from A >>>> to B is only possible if B dominates or post-dominates A. >>>> >>>> 2) co-convergent (divergent? for lack of a better name...): a call to >>>> a function with this attribute cannot be moved to have _fewer_ >>>> control dependencies; i.e., moving it from A to B is only possible if >>>> A dominates or post-dominates B. >>>> >>>> 3)...

*Hi, I am considering a language extension to Clang for optimizing GPU programs. This extension will allow the compiler to use different optimization strategies for divergent and non-divergent branches (to be explained below). We have observed significant performance gain by leveraging this proposed extension, so I want to discuss it here to see how the community likes/dislikes the idea. I will focus on the CUDA language and the PTX backend for now, but I believe thi...

...> > > > > > > > > > > > > > > > > > > > > > > > > *Hi, I am considering a language extension to Clang for optimizing GPU > programs. This extension will allow the compiler to use different > optimization strategies for divergent and non-divergent branches (to be > explained below). We have observed significant performance gain by > leveraging this proposed extension, so I want to discuss it here to see how > the community likes/dislikes the idea. I will focus on the CUDA language > and the PTX backend for no...

...lieve you have lots of great insights, but I don't see how cbranch.ifnone instructions directly solve my issue. The issue I am trying to solve is that certain CFG optimizations transform the CFG into a "bad" structure which hurts the performance of the compiled code in the presence of divergent branches. On the other hand, I don't want to disable jump threading all together because it is still beneficial for non-divergent branches. As far as I can understand, cbranch.ifnone provides a fast path so that a warp can jump over the region that no threads in the warp ever execute. Howeve...

...llvm-dev <llvm-dev at lists.llvm.org> wrote: > On 25.10.2016 16:28, Nicolai Hähnle wrote: >> >> But I fear that this path leads to eternal fuzziness. Let me try a >> completely different approach to define what we need by augmenting the >> semantics of IR with "divergence tokens". In addition to its usual >> value, every IR value carries a "divergence set" of divergence tokens. >> >> The basic rule is: the divergence set of a value is (at least) the union >> of the divergence sets of its operands. >> >> Every fu...

Hi all, I have some wind data (U and V components) and I would like to compute Vorticity and Divergence of these fields. Is there any R function that can easily do that? Thanks in advance for any help Igor Oliveira CSAG, Dept. Environmental & Geographical Science, University of Cape Town, Private Bag X3, Rondebosch 7701. Tel.: +27 (0)21 650 5774 South Africa Fax: +27 (0)21 650...

...xt analysis jobs but I?m trying to use ferrret to do some experiments. I understood that Ferret used the same index format as lucene but I cannot look into a lucene index with ferret and cannot read a ferret index with luke (the lucene index browser). Am I doing somehting wrong or have the formats diverged? -------------- next part -------------- An HTML attachment was scrubbed... URL: http://rubyforge.org/pipermail/ferret-talk/attachments/20080124/db73387d/attachment.html

On the surface this seems pretty simple, but I flummoxed. I have two sets of numbers they bounce around zero, positive one and negative one. They have a relationship between them, where one diverges away from the other. I want create a second set of numbers that tracks that divergence. #Lets make some data like mine, kinda Firstset <- runif(100, min = -1 , max =1) Secondset <- runif(100, min = -1 , max =1) #So something like: Divergence <- abs (Firstset - Secondset) #but this do...

...XX^2/x)-x) integrated <- integrate(integrand, lower=0, upper=upper)$value (final <- abs(XX)*pi^(-0.5)*exp(2*XX)*integrated) } b<- sapply(a, Cfun, upper=1) The error that I am getting is as follows: Error in integrate(integrand, lower = 0, upper = upper) : the integral is probably divergent Does this mean I cannot solve the integral ? Any possible ways to fix this problem will be highly appreciated.The question can be found on http://stackoverflow.com/questions/15892586/solving-an-integral-in-r-gives-error-the-integral-is-probably-divergent also. Thanks. [[alternative HTML ve...

> On Dec 5, 2017, at 13:53, Matt Arsenault <arsenm2 at gmail.com> wrote: > > > >> On Dec 5, 2017, at 02:51, Haidl, Michael via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote: >> >> Hi dev list, >> >> I am currently exploring the integration of AMDGPU/ROCm into the PACXX project and observing some

...4 (0)07976206103 Email:morris.anglin at ncl.ac.uk Email:morris.anglin at nuth.nhs.uk http://www.ncl.ac.uk/ihs/postgrad/research/studentprofile.htm To me, diversity is more complicated than rituals, food, clothing, etc. ...or race, language, and class, etc. To me, diversity needs to include divergent viewpoints, divergent interpretations, and divergent perspectives. Thus, diversity needs to include giving power and sanctioned space for divergent voices, even if this means disagreeing".

.... > My builds for the two platforms used exactly the same source files, though > there were a few ifdefs in the test_echo routine to deal with file I/O for > the C55 with its 16-bit char size. When I get a chance, I will add some > instrumentation and see if I can find where things diverge. Just looking at > the canceled audio files with a waveform editor, they were not obviously > different, so it is not a burning issue for me. Try updating svn again. I just found out that EXTEND32() and EXTRACT16() were actually unsafe due to a pair of () missing around the argument. I a...

I tried to reduce the test case in https://bugs.llvm.org/show_bug.cgi?id=42706. Here it is crashing opt: $ ~/llvm-debug/bin/opt -use-gpu-divergence-analysis -divergence stripped.ll WARNING: You're attempting to print out a bitcode file. This is inadvisable as it may cause display problems. If you REALLY want to taste LLVM bitcode first-hand, you can force output with the `-f' option. opt: /home/jayfoad2/git/llvm-project/llvm/lib/A...

I'm using 7.0. I am attaching the reduced example. nvcc sync.cu -arch=sm_35 -ptx gives // .globl _Z3foov .visible .entry _Z3foov( ) { .reg .pred %p<2>; .reg .s32 %r<3>; mov.u32 %r1, %tid.x; and.b32 %r2, %r1, 1; setp.eq.b32 %p1, %r2, 1; @!%p1 bra BB7_2; bra.uni