<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=""><br class=""><div><blockquote type="cite" class=""><div class="">On Oct 11, 2017, at 2:40 PM, Brian M. Rzycki <<a href="mailto:brzycki@gmail.com" class="">brzycki@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">I did more testing on the DT/LVI patch for JumpThreading and I am unable to reproduce the 10% sqlite3 regression Michael Zolotukhin reported.</div></div></blockquote>Could you please try building full sqlite3 test with -flto? The 10% regression was detected on an O3-LTO bot, while in my example (just O3) I also saw just 5%. That’s what you’re probably seeing now (plus-minus differences in our configurations and noise).</div><div><br class=""></div><div>Thanks for the testing!</div><div><br class=""></div><div>Michael<br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class=""><div class="">There are two compilers: upstream and dt. The upstream compiler has the</div><div class="">following patch as its HEAD:</div><div class=""><font face="monospace, monospace" class="">$ git log HEAD</font></div><div class=""><font face="monospace, monospace" class="">commit c491ccc7bbddf8c04885fd3ab90f90<wbr class="">cc9c319d33 (HEAD -> master)</font></div><div class=""><font face="monospace, monospace" class="">Author: Ayal Zaks <<a href="mailto:ayal.zaks@intel.com" target="_blank" class="">ayal.zaks@intel.com</a>></font></div><div class=""><font face="monospace, monospace" class="">Date: Thu Oct 5 15:45:14 2017 +0000</font></div><div class=""><font face="monospace, monospace" class=""><br class=""></font></div><div class=""><font face="monospace, monospace" class=""> [LV] Fix PR34743 - handle casts that sink after interleaved loads</font></div><div class=""><font face="monospace, monospace" class=""><br class=""></font></div><div class=""><font face="monospace, monospace" class=""> When ignoring a load that participates in an interleaved group, make</font></div><div class=""><font face="monospace, monospace" class=""> sure to move a cast that needs to sink after it.</font></div><div class=""><font face="monospace, monospace" class=""><br class=""></font></div><div class=""><font face="monospace, monospace" class=""> Testcase derived from reproducer of PR34743.</font></div><div class=""><font face="monospace, monospace" class=""><br class=""></font></div><div class=""><font face="monospace, monospace" class=""> Differential Revision: <a href="https://reviews.llvm.org/D38338" target="_blank" class="">https://reviews.llvm.org/<wbr class="">D38338</a></font></div><div class=""><font face="monospace, monospace" class=""><br class=""></font></div><div class=""><font face="monospace, monospace" class="">The dt compiler is based on the exact same patch as upstream, only with</font></div><div class=""><font face="monospace, monospace" class=""><a href="https://reviews.llvm.org/D38558" target="_blank" class="">https://reviews.llvm.org/<wbr class="">D38558</a> applied.</font></div><div class=""><br class=""></div><div class="">The sqlite version:</div><div class=""><font face="monospace, monospace" class="">$ cat sqlite/VERSION</font></div><div class=""><font face="monospace, monospace" class="">3.20.1</font></div><div class=""><br class=""></div><div class="">The host is an X86 server-class CPU:</div><div class=""><font face="monospace, monospace" class="">processor : 30</font></div><div class=""><font face="monospace, monospace" class="">vendor_id : GenuineIntel</font></div><div class=""><font face="monospace, monospace" class="">cpu family : 6</font></div><div class=""><font face="monospace, monospace" class="">model : 79</font></div><div class=""><font face="monospace, monospace" class="">model name : Intel(R) Xeon(R) CPU E5-2667 v4 @ 3.20GHz</font></div><div class=""><font face="monospace, monospace" class="">stepping : 1</font></div><div class=""><br class=""></div><div class="">Here are the compiler runs:</div><div class=""><br class=""></div><div class=""><font face="monospace, monospace" class=""># upstream compiler, best of 3 runs</font></div><div class=""><font face="monospace, monospace" class="">$ time taskset -c 30 /work/brzycki/upstream/<wbr class="">install/bin/clang -DNDEBUG -O3 -DSTDC_HEADERS=1 -DSQLITE_OMIT_LOAD_EXTENSION=1 -DSQLITE_THREADSAFE=0 -o sqlite3.c.o -c sqlite3.c</font></div><div class=""><font face="monospace, monospace" class=""> </font></div><div class=""><font face="monospace, monospace" class="">real 7m57.157s</font></div><div class=""><font face="monospace, monospace" class="">user 7m56.472s</font></div><div class=""><font face="monospace, monospace" class="">sys 0m0.560s</font></div><div class=""><font face="monospace, monospace" class=""> </font></div><div class=""><font face="monospace, monospace" class=""># dt patched compiler, best of 3 runs</font></div><div class=""><font face="monospace, monospace" class="">$ time taskset -c 30 /work/brzycki/dt/install/bin/<wbr class="">clang -DNDEBUG -O3 -DSTDC_HEADERS=1 -DSQLITE_OMIT_LOAD_EXTENSION=1 -DSQLITE_THREADSAFE=0 -o sqlite3.c.o -c sqlite3.c</font></div><div class=""><font face="monospace, monospace" class=""> </font></div><div class=""><font face="monospace, monospace" class="">real 8m14.753s</font></div><div class=""><font face="monospace, monospace" class="">user 8m13.932s</font></div><div class=""><font face="monospace, monospace" class="">sys 0m0.496s</font></div><div class=""> </div><div class="">That’s a difference of 4.3%. I'm unsure why Arm64 is showing a further regression of 6%. I've also done some native Aarch64 Linux testing on a Firefly ARM72 device and see a difference very close to this number. If anyone is interested I can post this data too.</div></div><div class=""><br class=""></div><div class="">I plan on re-running these tests when <a href="https://reviews.llvm.org/D38802" target="_blank" class="">https://reviews.llvm.org/<wbr class="">D38802</a> lands to see if it further reduces the overhead or not.</div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Wed, Oct 4, 2017 at 3:12 PM, Brian M. Rzycki <span dir="ltr" class=""><<a href="mailto:brzycki@gmail.com" target="_blank" class="">brzycki@gmail.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">I have just pushed two patches into Phabricator:<div class="">Take two of the DT/LVI patch:</div><div class=""><p class="MsoNormal" style="font-size:12.8px"><a href="https://reviews.llvm.org/D38558" target="_blank" class="">https://reviews.llvm.org/D3855<wbr class="">8</a><u class=""></u><u class=""></u></p><p class="MsoNormal" style="font-size:12.8px"><br class=""></p><p class="MsoNormal" style="font-size:12.8px">A patch to place DT/LVI preservation under a flag:</p><p class="MsoNormal" style="font-size:12.8px"><a href="https://reviews.llvm.org/D38559" target="_blank" class="">https://reviews.llvm.org/D3855<wbr class="">9</a></p><p class="MsoNormal" style="font-size:12.8px"><br class=""></p><p class="MsoNormal" style="font-size:12.8px">Jakub, I too am planning on doing some profiling later this week. I would like to collaborate to minimize duplicated efforts.</p></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br class=""><div class="gmail_quote">On Wed, Oct 4, 2017 at 12:01 PM, Jakub (Kuba) Kuderski via llvm-commits <span dir="ltr" class=""><<a href="mailto:llvm-commits@lists.llvm.org" target="_blank" class="">llvm-commits@lists.llvm.org</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">I will try to profile the sqlite compilation later this week. It is not easy to come up with some benchmarks for the batch updater, and because of that it hasn't really been optimized yet. JumpThreading seems to be the first pass to put significant pressure on the incremental updater, so it'd be valuable to learn how much faster we can get there.</div><div class="gmail_extra"><div class=""><div class="m_-329897501231553790h5"><br class=""><div class="gmail_quote">On Wed, Oct 4, 2017 at 12:47 PM, Michael Zolotukhin <span dir="ltr" class=""><<a href="mailto:mzolotukhin@apple.com" target="_blank" class="">mzolotukhin@apple.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class=""><br class=""><div class=""><span class=""><blockquote type="cite" class=""><div class="">On Oct 4, 2017, at 9:25 AM, Daniel Berlin <<a href="mailto:dberlin@dberlin.org" target="_blank" class="">dberlin@dberlin.org</a>> wrote:</div><br class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967Apple-interchange-newline"><div class=""><div dir="ltr" class="">+jakub for real.</div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Wed, Oct 4, 2017 at 9:21 AM, Daniel Berlin <span dir="ltr" class=""><<a href="mailto:dberlin@dberlin.org" target="_blank" class="">dberlin@dberlin.org</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">+jakub<div class=""><br class=""></div><div class="">I don't think preservation should be controlled by a flag. That seems like not a great path forward.</div><div class="">Either we should make it fast enough, or we should give up :)</div><div class=""><br class=""></div><div class="">Do you have any profiles on this?</div></div></blockquote></div></div></div></blockquote></span>I don’t, but it seems pretty clear what’s going on there - we do an extra work (preserving DT) for no benefits (we’re recomputing it a couple of passes later anyway). The pass after which it’s recomputed is SimplifyCFG, and I think it would be a much bigger endeavor to teach it to account for DT - so putting it under a flag for JumpThreading could help doing this work incrementally.</div><span class="m_-329897501231553790m_-1544835902761221036HOEnZb"><font color="#888888" class=""><div class=""><br class=""></div><div class="">Michael</div></font></span><div class=""><div class="m_-329897501231553790m_-1544835902761221036h5"><div class=""><br class=""><blockquote type="cite" class=""><div class=""><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class=""><div class=""><br class=""><br class=""></div></div><div class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967HOEnZb"><div class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967h5"><div class="gmail_extra"><br class=""><div class="gmail_quote">On Sat, Sep 30, 2017 at 12:19 PM, Michael Zolotukhin via llvm-commits <span dir="ltr" class=""><<a href="mailto:llvm-commits@lists.llvm.org" target="_blank" class="">llvm-commits@lists.llvm.org</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class="">For the record, we also detected significant compile-time increases caused by this patch. It caused up to 10% slow downs on sqlite3 and some other tests from CTMark/LLVM testsuite (on O3/LTO and other optsets).<div class=""><br class=""></div><div class="">Reproducer:</div><div class=""><br class=""></div><div class="">time clang-r314435/bin/clang -DNDEBUG -O3 -arch arm64 -isysroot $SYSROOT -DSTDC_HEADERS=1 -DSQLITE_OMIT_LOAD_EXTENSION=<wbr class="">1 -DSQLITE_THREADSAFE=0 -w -o sqlite3.c.o -c $TESTSUITE/CTMark/sqlite3/sqli<wbr class="">te3.c</div><div class=""><div class="">real 0m20.235s</div><div class="">user 0m20.130s</div><div class="">sys 0m0.091s</div></div><div class=""><br class=""></div><div class=""><div class="">time clang-r314432/bin/clang -DNDEBUG -O3 -arch arm64 -isysroot $SYSROOT -DSTDC_HEADERS=1 -DSQLITE_OMIT_LOAD_EXTENSION=<wbr class="">1 -DSQLITE_THREADSAFE=0 -w -o sqlite3.c.o -c $TESTSUITE/CTMark/sqlite3/sqli<wbr class="">te3.c</div><div class=""><div class="">real 0m19.254s</div><div class="">user 0m19.154s</div><div class="">sys 0m0.094s</div></div><div class=""><br class=""></div><div class="">JumpThreading started to consume much longer time trying to preserve DT, but DT was still being recomputed couple of passes later. In general, I agree that we should preserve DT and in the end it should be beneficial for compile time too, but can we put it under a flag for now until we can actually benefit from it?</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Michael</div><div class=""></div></div><div class=""><div class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529h5"><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div class=""><blockquote type="cite" class=""><div class="">On Sep 30, 2017, at 5:02 AM, Daniel Jasper via llvm-commits <<a href="mailto:llvm-commits@lists.llvm.org" target="_blank" class="">llvm-commits@lists.llvm.org</a>> wrote:</div><br class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239Apple-interchange-newline"><div class=""><div dir="ltr" class="">I found other places where this Clang was running into this segfault. Reverted for now in r314589.</div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Fri, Sep 29, 2017 at 10:19 PM, Friedman, Eli via llvm-commits <span dir="ltr" class=""><<a href="mailto:llvm-commits@lists.llvm.org" target="_blank" class="">llvm-commits@lists.llvm.org</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF" class=""><span class="">
<div class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947moz-cite-prefix">On 9/28/2017 10:24 AM, Evandro Menezes
via llvm-commits wrote:<br class="">
</div>
<blockquote type="cite" class="">
<pre class="">Author: evandro
Date: Thu Sep 28 10:24:40 2017
New Revision: 314435
URL: <a class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947moz-txt-link-freetext" href="http://llvm.org/viewvc/llvm-project?rev=314435&view=rev" target="_blank">http://llvm.org/viewvc/llvm-pr<wbr class="">oject?rev=314435&view=rev</a>
Log:
[JumpThreading] Preserve DT and LVI across the pass
JumpThreading now preserves dominance and lazy value information across the
entire pass. The pass manager is also informed of this preservation with
the goal of DT and LVI being recalculated fewer times overall during
compilation.
This change prepares JumpThreading for enhanced opportunities; particularly
those across loop boundaries.
Patch by: Brian Rzycki <a class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947moz-txt-link-rfc2396E" href="mailto:b.rzycki@samsung.com" target="_blank"><b.rzycki@samsung.com></a>,
Sebastian Pop <a class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947moz-txt-link-rfc2396E" href="mailto:s.pop@samsung.com" target="_blank"><s.pop@samsung.com></a>
Differential revision: <a class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947moz-txt-link-freetext" href="https://reviews.llvm.org/D37528" target="_blank">https://reviews.llvm.org/D3752<wbr class="">8</a>
</pre>
</blockquote>
<br class=""></span>
It looks like this is causing an assertion failure on the polly aosp
buildbot
(<a class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947moz-txt-link-freetext" href="http://lab.llvm.org:8011/builders/aosp-O3-polly-before-vectorizer-unprofitable/builds/266/steps/build-aosp/logs/stdio" target="_blank">http://lab.llvm.org:8011/buil<wbr class="">ders/aosp-O3-polly-before-vect<wbr class="">orizer-unprofitable/builds/266<wbr class="">/steps/build-aosp/logs/stdio</a>):<br class="">
<pre style="font-family:'Courier New',courier,monotype,monospace;font-size:inherit;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px" class=""><span class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947stdout" style="font-family:'Courier New',courier,monotype,monospace">clang: /var/lib/buildbot/slaves/hexag<wbr class="">on-build-03/aosp/llvm.src/incl<wbr class="">ude/llvm/Support/GenericDomTre<wbr class="">eConstruction.h:906: static void llvm::DomTreeBuilder::SemiNCAI<wbr class="">nfo<llvm::DominatorTreeBase<ll<wbr class="">vm::BasicBlock, false> >::DeleteEdge(DomTreeT &, const BatchUpdatePtr, const NodePtr, const NodePtr) [DomTreeT = llvm::DominatorTreeBase<llvm::<wbr class="">BasicBlock, false>]: Assertion `!IsSuccessor(To, From) && "Deleted edge still exists in the CFG!"' failed.
#0 0x00000000014f6fc4 PrintStackTraceSignalHandler(v<wbr class="">oid*) (llvm.inst/bin/clang+0x14f6fc4<wbr class="">)
#1 0x00000000014f72d6 SignalHandler(int) (llvm.inst/bin/clang+0x14f72d6<wbr class="">)
#2 0x00007f694afddd10 __restore_rt (/lib/x86_64-linux-gnu/libpthr<wbr class="">ead.so.0+0x10d10)
#3 0x00007f6949bbb267 gsignal /build/buildd/glibc-2.21/signa<wbr class="">l/../sysdeps/unix/sysv/linux/r<wbr class="">aise.c:55:0
#4 0x00007f6949bbceca abort /build/buildd/glibc-2.21/stdli<wbr class="">b/abort.c:91:0
#5 0x00007f6949bb403d __assert_fail_base /build/buildd/glibc-2.21/asser<wbr class="">t/assert.c:92:0
#6 0x00007f6949bb40f2 (/lib/x86_64-linux-gnu/libc.so<wbr class="">.6+0x2e0f2)
#7 0x000000000104a1dc (llvm.inst/bin/clang+0x104a1dc<wbr class="">)
#8 0x0000000001357fd9 llvm::JumpThreadingPass::Proce<wbr class="">ssBlock(llvm::BasicBlock*) (llvm.inst/bin/clang+0x1357fd9<wbr class="">)
#9 0x0000000001356e6e llvm::JumpThreadingPass::runIm<wbr class="">pl(llvm::Function&, llvm::TargetLibraryInfo*, llvm::LazyValueInfo*, llvm::AAResults*, llvm::DominatorTree*, bool, std::unique_ptr<llvm::BlockFre<wbr class="">quencyInfo, std::default_delete<llvm::Bloc<wbr class="">kFrequencyInfo> >, std::unique_ptr<llvm::BranchPr<wbr class="">obabilityInfo, std::default_delete<llvm::Bran<wbr class="">chProbabilityInfo> >) (llvm.inst/bin/clang+0x1356e6e<wbr class="">)
#10 0x0000000001363c49 (anonymous namespace)::JumpThreading::run<wbr class="">OnFunction(llvm::Function&) (llvm.inst/bin/clang+0x1363c49<wbr class="">)
#11 0x00000000010a53c4 llvm::FPPassManager::runOnFunc<wbr class="">tion(llvm::Function&) (llvm.inst/bin/clang+0x10a53c4<wbr class="">)
#12 0x00000000031f7376 (anonymous namespace)::CGPassManager::run<wbr class="">OnModule(llvm::Module&) (llvm.inst/bin/clang+0x31f7376<wbr class="">)
#13 0x00000000010a5b05 llvm::legacy::PassManagerImpl:<wbr class="">:run(llvm::Module&) (llvm.inst/bin/clang+0x10a5b05<wbr class="">)
#14 0x0000000001688beb clang::EmitBackendOutput(clang<wbr class="">::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwri<wbr class="">te_stream, std::default_delete<llvm::raw_<wbr class="">pwrite_stream> >) (llvm.inst/bin/clang+0x1688beb<wbr class="">)
#15 0x0000000001ed7672 clang::BackendConsumer::Handle<wbr class="">TranslationUnit(clang::ASTCont<wbr class="">ext&) (llvm.inst/bin/clang+0x1ed7672<wbr class="">)
#16 0x0000000002195235 clang::ParseAST(clang::Sema&, bool, bool) (llvm.inst/bin/clang+0x2195235<wbr class="">)
#17 0x0000000001a75628 clang::FrontendAction::Execute<wbr class="">() (llvm.inst/bin/clang+0x1a75628<wbr class="">)
#18 0x0000000001a37181 clang::CompilerInstance::Execu<wbr class="">teAction(clang::FrontendAction<wbr class="">&) (llvm.inst/bin/clang+0x1a37181<wbr class="">)
#19 0x0000000001b06501 clang::ExecuteCompilerInvocati<wbr class="">on(clang::CompilerInstance*) (llvm.inst/bin/clang+0x1b06501<wbr class="">)
#20 0x000000000080e433 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (llvm.inst/bin/clang+0x80e433)
#21 0x000000000080c997 main (llvm.inst/bin/clang+0x80c997)
#22 0x00007f6949ba6a40 __libc_start_main /build/buildd/glibc-2.21/csu/l<wbr class="">ibc-start.c:323:0
#23 0x0000000000809479 _start (llvm.inst/bin/clang+0x809479)
</span></pre>
I'll try to come up with a reduced testcase this afternoon.<br class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947Apple-interchange-newline">
<br class="">
-Eli<span class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239HOEnZb"><font color="#888888" class=""><br class="">
<pre class="m_-329897501231553790m_-1544835902761221036m_4776887672213244967m_-1877988520402087529m_5149017397612556239m_-3717849707277701947moz-signature" cols="72">--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project</pre>
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</div></blockquote></div><br class=""></div></div></div></blockquote></div><br class=""><br clear="all" class=""><div class=""><br class=""></div></div></div><span class="m_-329897501231553790HOEnZb"><font color="#888888" class="">-- <br class=""><div class="m_-329897501231553790m_-1544835902761221036gmail_signature" data-smartmail="gmail_signature"><div class="">Jakub Kuderski</div></div>
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