<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Alex,<div class=""><br class=""></div><div class="">This has been very recently fixed by Hal. See <a href="http://reviews.llvm.org/rL270771" class="">http://reviews.llvm.org/rL270771</a></div><div class=""><br class=""></div><div class="">Adam</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 4, 2016, at 3:13 AM, Alex Susu via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> Hello.</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> Mikhail, I come back to this older thread.</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> I need to do a few changes to LoopVectorize.cpp.</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> One of them is related to figuring out the exact C source line and column number of the loops being vectorized. I've noticed that a recent version of LoopVectorize.cpp prints imprecise debug info for vectorized loops such as, for example, the location of a character of an assignment statement inside the respective loop.</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> It would help me a lot in my project to find the exact C source line and column number of the first and last character of the loop being vectorized. (imprecise location would make my life more complicated).</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> Is this feasible? Or are there limitations at the level of clang of retrieving the exact C source line and column number location of the beginning and end of a loop (it can include indent chars before and after the loop)?</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> (I've seen other examples with imprecise location such as the "Reading diagnostics" chapter in the book<span class="Apple-converted-space"> </span></span><a href="https://books.google.ro/books?isbn=1782166939" style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">https://books.google.ro/books?isbn=1782166939</a><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""><span class="Apple-converted-space"> </span>.)</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> Note: to be able to retrieve the debug info from the C source file we require to run clang with -Rpass* options, as discussed before. Otherwise, if we run clang first, then opt on the resulting .ll file which runs LoopVectorize, we lose the C source file debug info (DebugLoc class, etc) and obtain the debug info from the .ll file. An example:</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> clang -O3 3better.c -arch=mips -ffast-math -Rpass=debug -Rpass=loop-vectorize -Rpass-analysis=loop-vectorize -S -emit-llvm -fvectorize -mllvm -debug -mllvm -force-vector-width=16 -save-temps</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> Thank you,</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> Alex</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">On 2/18/2016 2:17 AM, Mikhail Zolotukhin wrote:</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">Hi Alex,<br class=""><br class="">I'm not aware of efforts on loop coalescing in LLVM, but probably polly can do<br class="">something like this. Also, one related thought: it might be worth making it a separate<br class="">pass, not a part of loop vectorizer. LLVM already has several 'utility' passes (e.g.<br class="">loop rotation), which primarily aims at enabling other passes.<br class=""><br class="">Thanks, Michael<br class=""><br class=""><blockquote type="cite" class="">On Feb 15, 2016, at 6:44 AM, RCU <<a href="mailto:alex.e.susu@gmail.com" class="">alex.e.susu@gmail.com</a><br class=""><<a href="mailto:alex.e.susu@gmail.com" class="">mailto:alex.e.susu@gmail.com</a>>> wrote:<br class=""><br class="">Hello, Michael. I come back to this older email. Sorry if you receive it again.<br class=""><br class="">I am trying to implement coalescing/collapsing of nested loops. This would be<br class="">clearly beneficial for the loop vectorizer, also. I'm normally planning to start<br class="">modifying the LLVM loop vectorizer to add loop coalescing of the LLVM language.<br class=""><br class="">Are you aware of a similar effort on loop coalescing in LLVM (maybe even a different<br class="">LLVM pass, not related to the LLVM loop vectorizer)?<br class=""><br class="">Thank you, Alex<br class=""><br class="">On 7/9/2015 10:38 AM, RCU wrote:<br class=""><blockquote type="cite" class=""><br class=""><br class="">With best regards, Alex Susu<br class=""><br class="">On 7/8/2015 9:17 PM, Michael Zolotukhin wrote:<br class=""><blockquote type="cite" class="">Hi Alex,<br class=""><br class="">Example from the link you provided looks like this:<br class=""><br class="">|for (i=0; i<M; i++ ){ z[i]=0; for (ckey=row_ptr[i]; ckey<row_ptr[i+1];<br class="">ckey++) { z[i] += data[ckey]*x[colind[ckey]]; } }|<br class=""><br class="">Is it the loop you are trying to vectorize? I don’t see any ‘if’ inside the<br class="">innermost loop.<br class=""></blockquote>I tried to simplify this code in the hope the loop vectorizer can take care of it<br class="">better: I linearized...<br class=""><br class=""><blockquote type="cite" class="">But anyway, here vectorizer might have following troubles: 1) iteration count of<br class="">the innermost loop is unknown. 2) Gather accesses ( a[b[i]] ). With AVX512 set of<br class="">instructions it’s possible to generate efficient code for such case, but a) I<br class="">think it’s not supported yet, b) if this ISA isn’t available, then vectorized<br class="">code would need to ‘manually’ gather scalar values to vector, which might be slow<br class="">(and thus, vectorizer might decide to leave the code scalar).<br class=""><br class="">And here is a list of papers vectorizer is based on: // The reduction-variable<br class="">vectorization is based on the paper: // D. Nuzman and R. Henderson.<br class="">Multi-platform Auto-vectorization. // // Variable uniformity checks are inspired<br class="">by: // Karrenberg, R. and Hack, S. Whole Function Vectorization. // // The<br class="">interleaved access vectorization is based on the paper: // Dorit Nuzman, Ira<br class="">Rosen and Ayal Zaks. Auto-Vectorization of Interleaved // Data for SIMD // //<br class="">Other ideas/concepts are from: // A. Zaks and D. Nuzman. Autovectorization in<br class="">GCC-two years later. // // S. Maleki, Y. Gao, M. Garzaran, T. Wong and D. Padua.<br class="">An Evaluation of // Vectorizing Compilers. And probably, some of the parts are<br class="">written from scratch with no reference to a paper.<br class=""><br class="">The presentations you found are a good starting point, but while they’re still<br class="">good from getting basics of the vectorizer, they are a bit outdated now in a<br class="">sense that a lot of new features has been added since then (and bugs fixed:) ).<br class="">Also, I’d recommend trying a newer LLVM version - I don’t think it’ll handle the<br class="">example above, but it would be much more convenient to investigate why the loop<br class="">isn’t vectorized and fix vectorizer if we figure out how.<br class=""><br class="">Best regards, Michael<br class=""><br class=""></blockquote><br class="">Thanks for the papers - these appear to be written in the header of the file<br class="">implementing the loop vect. tranformation (found at<br class="">"where-you-want-llvm-to-live"/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp ).<br class=""><br class=""><blockquote type="cite" class=""><blockquote type="cite" class="">On Jul 8, 2015, at 10:01 AM, RCU <<a href="mailto:alex.e.susu@gmail.com" class="">alex.e.susu@gmail.com</a><br class=""><<a href="mailto:alex.e.susu@gmail.com" class="">mailto:alex.e.susu@gmail.com</a>><<a href="mailto:alex.e.susu@gmail.com" class="">mailto:alex.e.susu@gmail.com</a>>> wrote:<br class=""><br class="">Hello. I am trying to vectorize a CSR SpMV (sparse matrix vector<br class="">multiplication) procedure but the LLVM loop vectorizer is not able to handle<br class="">such code. I am using cland and llvm version 3.4 (on Ubuntu 12.10). I use the<br class="">-fvectorize option with clang and -loop-vectorize with opt-3.4 . The CSR SpMV<br class="">function is inspired from<br class=""><a href="http://stackoverflow.com/questions/13636464/slow-sparse-matrix-vector-product-csr-using-open-mp" class="">http://stackoverflow.com/questions/13636464/slow-sparse-matrix-vector-product-csr-using-open-mp</a><br class=""><br class=""><br class=""><br class=""></blockquote></blockquote></blockquote></blockquote></blockquote><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">(I can provide the exact code samples used).</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" class=""><blockquote type="cite" class=""><blockquote type="cite" class=""><blockquote type="cite" class=""><br class="">Basically the problem is the loop vectorizer does NOT work with if inside loop<br class="">(be it 2 nested loops or a modification of SpMV I did with just 1 loop - I can<br class="">provide the exact code) changing the value of the accumulator z. I can sort of<br class="">understand why LLVM isn't able to vectorize the code. However,<br class=""><a href="athttp://llvm.org/docs/Vectorizers.html#if-conversionit" class="">athttp://llvm.org/docs/Vectorizers.html#if-conversionit</a><span class="Apple-converted-space"> </span>is written: <<The Loop<br class="">Vectorizer is able to "flatten" the IF statement in the code and generate a<br class="">single stream of instructions. The Loop Vectorizer supports any control flow in<br class="">the innermost loop. The innermost loop may contain complex nesting of IFs,<br class="">ELSEs and even GOTOs.>> Could you please tell me what are these lines exactly<br class="">trying to say.<br class=""><br class="">Could you please tell me what algorithm is the LLVM loop vectorizer using<br class="">(maybe the algorithm is described in a paper) - I currently found only 2<br class="">presentations on this<br class="">topic:http://<a href="http://llvm.org/devmtg/2013-11/slides/Rotem-Vectorization.pdfand" class="">llvm.org/devmtg/2013-11/slides/Rotem-Vectorization.pdfand</a><br class=""><a href="https://archive.fosdem.org/2014/schedule/event/llvmautovec/attachments/audio/321/export/events/attachments/llvmautovec/audio/321/AutoVectorizationLLVM.pdf" class="">https://archive.fosdem.org/2014/schedule/event/llvmautovec/attachments/audio/321/export/events/attachments/llvmautovec/audio/321/AutoVectorizationLLVM.pdf</a><br class=""><br class=""><br class=""><br class=""></blockquote></blockquote></blockquote></blockquote></blockquote><span style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">.</span><br style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 10px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" class=""><blockquote type="cite" class=""><blockquote type="cite" class=""><blockquote type="cite" class=""><br class="">Thank you very much, Alex _______________________________________________ LLVM<br class="">Developers mailing list<span class="Apple-converted-space"> </span><a href="mailto:LLVMdev@cs.uiuc.edu" class="">LLVMdev@cs.uiuc.edu</a><br class=""><<a href="mailto:LLVMdev@cs.uiuc.edu" class="">mailto:LLVMdev@cs.uiuc.edu</a>><<a href="mailto:LLVMdev@cs.uiuc.edu" class="">mailto:LLVMdev@cs.uiuc.edu</a>><a href="http://llvm.cs.uiuc.edu/" class="">http://llvm.cs.uiuc.edu</a><br class=""><br class=""><br class=""></blockquote></blockquote></blockquote></blockquote></blockquote><span style="font-family: Helvetica; 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