<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="">Okay, seemingly it’s just a bug in the vectorizer: it updates DT incorrectly. Specifically, this line is incorrect:<div class=""><div style="margin: 0px; font-size: 11px; font-family: Menlo; color: rgb(147, 200, 106);" class=""><div style="margin: 0px; color: rgb(52, 149, 175);" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #000000" class=""> </span>DT<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">-></span>changeImmediateDominator<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">(</span>LoopExitBlock<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">, </span>LoopMiddleBlock<span style="font-variant-ligatures: no-common-ligatures; color: #000000" class="">);</span></div><div class=""><br class=""></div></div></div><div class="">The correct dominator for LoopExitBlock in this case would be LoopBypassBlocks[0] (not LoopMiddleBlock). I’ll send a patch soon.</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Michael<br class=""><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Oct 29, 2014, at 2:29 PM, Michael Zolotukhin <<a href="mailto:mzolotukhin@apple.com" class="">mzolotukhin@apple.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Chandler,<div class=""><br class=""></div><div class="">I found a problem exposed by this commit: when CSE runs right after the loop vectorizer, it perform incorrect transformation which cause verifier to fail later. The reason for that is seemingly that after the vectorizer some analysis (DomTree?) isn’t invalidated, while it should be. This happens on several benchmarks from spec2006 when compiled with PGO/LTO. A simple workaround is to invoke simplify-cfg before early-cse, but that’s just papering over the issue.</div><div class=""><br class=""></div><div class="">What is a proper way for killing/updating dom-tree (I suspect it’s the rootcause) info after some pass?</div><div class=""><br class=""></div><div class="">Here is a small reduced test-case to reproduce the problem:</div><div class=""><br class=""></div><div class=""><font face="Menlo" class="">$ opt -loop-vectorize -instcombine -early-cse -S reduced.ll</font></div><div class=""><font face="Menlo" class="">Instruction does not dominate all uses!</font></div><div class=""><font face="Menlo" class=""> %18 = xor i64 %umax, -1</font></div><div class=""><font face="Menlo" class=""> %scevgep45 = getelementptr i8* %d.020, i64 %18</font></div><div class=""><font face="Menlo" class="">LLVM ERROR: Broken function found, compilation aborted!</font></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""></div></div><span id="cid:6D4EC9C3-06EC-4FFF-AC8D-C3A5163469EF@apple.com"><reduced.ll></span><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""></div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Michael</div><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Oct 13, 2014, at 5:44 PM, Chandler Carruth <<a href="mailto:chandlerc@google.com" class="">chandlerc@google.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">(and the flag went in in r219644 and is '-extra-vectorizer-passes', sorry for failing to mention that)</div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Mon, Oct 13, 2014 at 5:44 PM, Chandler Carruth <span dir="ltr" class=""><<a href="mailto:chandlerc@google.com" target="_blank" class="">chandlerc@google.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="">So, I've added a flag (off by default naturally) which adds several passes that folks have suggested either here or in other conversations around the vectorizers.<div class=""><br class=""></div><div class="">The theory behind these suggestions makes a lot of sense to me, but this will be one of the hard things to benchmark, so I wanted to just get an easy switch in place that anyone could try out and report back results.</div><div class=""><br class=""></div><div class="">I'll start a general discussion about this on a new thread. I think at least loop-rotate makes perfect sense, and we'll see if the others seem worth their compile-time cost.</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br class=""><div class="gmail_quote">On Thu, Oct 9, 2014 at 1:51 PM, Chandler Carruth <span dir="ltr" class=""><<a href="mailto:chandlerc@google.com" target="_blank" class="">chandlerc@google.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=""><div class="gmail_extra"><div class="gmail_quote"><span class="">On Thu, Oct 9, 2014 at 1:46 PM, Gerolf Hoflehner <span dir="ltr" class=""><<a href="mailto:ghoflehner@apple.com" target="_blank" class="">ghoflehner@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="">Are you going to test ARM and x86? Otherwise could you send out your patch even though it is preliminary?</div></blockquote><div class=""><br class=""></div></span><div class="">Only x86 sadly. I'll send it out later today hopefully. </div><div class=""><div 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=""><div class=""><br class=""></div><div class="">Thanks</div><span class=""><font color="#888888" class=""><div class="">Gerolf</div></font></span><div class=""><div class=""><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Oct 9, 2014, at 12:44 PM, Chandler Carruth <<a href="mailto:chandlerc@google.com" target="_blank" class="">chandlerc@google.com</a>> wrote:</div><br class=""><div class=""><p dir="ltr" class="">I have a patch I've been testing to clean up a lot of the passes around the vectorizers. I'll add this in and finish testing it, then send it out with numbers.</p>
<div class="gmail_quote">On Oct 9, 2014 12:40 PM, "Andrew Trick" <<a href="mailto:atrick@apple.com" target="_blank" class="">atrick@apple.com</a>> wrote:<br type="attribution" 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=""><blockquote type="cite" class=""><div class="">On Oct 9, 2014, at 8:48 AM, Hal Finkel <<a href="mailto:hfinkel@anl.gov" target="_blank" class="">hfinkel@anl.gov</a>> wrote:</div><br class=""><div class=""><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important" class="">----- Original Message -----</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><blockquote type="cite" style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class="">From: "Arnold Schwaighofer" <<a href="mailto:aschwaighofer@apple.com" target="_blank" class="">aschwaighofer@apple.com</a>><br class="">To: "Zinovy Nis" <<a href="mailto:zinovy.nis@gmail.com" target="_blank" class="">zinovy.nis@gmail.com</a>><br class="">Cc: "Hal Finkel" <<a href="mailto:hfinkel@anl.gov" target="_blank" class="">hfinkel@anl.gov</a>>, "LLVM Commits" <<a href="mailto:llvm-commits@cs.uiuc.edu" target="_blank" class="">llvm-commits@cs.uiuc.edu</a>>, "Tobias Grosser" <<a href="mailto:tobias@grosser.es" target="_blank" class="">tobias@grosser.es</a>>,<br class="">"Chandler Carruth" <<a href="mailto:chandlerc@google.com" target="_blank" class="">chandlerc@google.com</a>>, "Nadav Rotem" <<a href="mailto:nrotem@apple.com" target="_blank" class="">nrotem@apple.com</a>><br class="">Sent: Thursday, October 9, 2014 10:07:42 AM<br class="">Subject: Re: SLP/Loop vectorizer pass ordering<br class=""><br class=""><br class="">The loop vectorizer now sees this loop:<br class=""><br class="">define void<br class="">@_Z21ambient_occlusion_vecP6_IsectR5vrandILm8EE(%struct._Isect*<br class="">nocapture %isect, %class.vrand* nocapture readonly<br class="">dereferenceable(32) %rng) #0 {<br class="">entry:<br class=""> br label %for.body<br class=""><br class="">for.body: ; preds =<br class="">%for.inc.for.body_crit_edge, %entry<br class=""> %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next,<br class=""> %for.inc.for.body_crit_edge ]<br class=""> %occlusion.017 = phi float [ 1.000000e+00, %entry ], [ %phitmp,<br class=""> %for.inc.for.body_crit_edge ]<br class=""> %exitcond = icmp eq i64 %indvars.iv, 63<br class=""> br i1 %exitcond, label %for.end, label %for.inc.for.body_crit_edge<br class=""><br class="">for.inc.for.body_crit_edge: ; preds = %for.body<br class=""> %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1<br class=""> %phitmp = fadd fast float %occlusion.017, 1.000000e+00<br class=""> br label %for.body<br class=""><br class="">for.end: ; preds = %for.body<br class=""> %occlusion.017.lcssa = phi float [ %occlusion.017, %for.body ]<br class=""> %t5 = getelementptr inbounds %struct._Isect* %isect, i64 0, i32 0<br class=""> store float %occlusion.017.lcssa, float* %t5, align 4, !tbaa !1<br class=""> ret void<br class="">}<br class=""><br class="">Notice that the loop exit block is the loop header and the latch is<br class="">not guaranteed to be executed. The loop vectorizer assumes such<br class="">loops have been rotated.<br class=""><br class=""><br class="">If we send this IR through loop-rotate it will vectorize.<br class=""><br class="">The farther away we move the loop vectorizer from loop rotate the<br class="">likelier some optimization will destroy the rotated from. We might<br class="">just want to run loop rotate before the loop vectorizer ...<br class=""><br class=""></blockquote><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important" class="">I think that makes sense -- and I don't recall loop rotation being expensive, plus is preserves just about everything (and I think does a reasonable job cleaning up after itself) ;)</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important" class="">I'd say we run some benchmarks, and barring any issues, we just do it.</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""></div></blockquote><div class=""><br class=""></div><div class="">Well, that is a classic candidate for rotate. So assuming whatever GVN is doing is sane, then I’d say it makes sense to rerun rotation.</div><div class=""><br class=""></div><div class="">-Andy</div><div class=""><br class=""></div><br class=""><blockquote type="cite" class=""><div class=""><blockquote type="cite" style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><br class=""><br class=""><blockquote type="cite" class="">On Oct 9, 2014, at 1:15 AM, Zinovy Nis <<a href="mailto:zinovy.nis@gmail.com" target="_blank" class="">zinovy.nis@gmail.com</a>><br class="">wrote:<br class=""><br class="">Hi.<br class=""><br class="">Did you have a chance to look at my reproducer?<br class=""><br class="">2014-10-07 21:34 GMT+04:00 Zinovy Nis <<a href="mailto:zinovy.nis@gmail.com" target="_blank" class="">zinovy.nis@gmail.com</a>>:<br class=""><blockquote type="cite" class="">Hi.<br class=""><br class="">I attached a reduced sample, based on<br class=""><a href="https://code.google.com/p/aobench/" target="_blank" class="">https://code.google.com/p/aobench/</a>.<br class=""><br class="">Run it first with an old SLP order:<br class=""><br class="">1) clang -c -Ofast -static -march=core-avx2 aobench.cpp -Rpass=.<br class="">-mllvm -debug-only=loop-vectorize -mllvm<br class="">-run-slp-after-loop-vectorization=0<br class=""><br class="">and then with a new order:<br class=""><br class="">2) clang -c -Ofast -static -march=core-avx2 aobench.cpp -Rpass=.<br class="">-debug-only=loop-vectorize -mllvm<br class="">-run-slp-after-loop-vectorization=1<br class=""><br class="">and see the logs:<br class=""><br class="">1) aobench.cpp:59:9: remark: vectorized loop (vectorization<br class="">factor: 8,<br class="">unrolling interleave factor: 1) [-Rpass=loop-vectorize]<br class="">2) aobench.cpp:59:9: remark: loop ***not*** vectorized: use<br class="">-Rpass-analysis=loop-vectorize for more info<br class="">[-Rpass-missed=loop-vectorize]<br class=""><br class="">LV: Found an unidentified PHI. %occlusion.017 = phi float [<br class="">1.000000e+00, %entry ], [ %phitmp, %for.inc.for.body_crit_edge ]<br class="">LV: Can't vectorize the instructions or CFG<br class="">LV: Not vectorizing: Cannot prove legality.<br class=""><br class="">2014-10-06 17:46 GMT+04:00 Hal Finkel <<a href="mailto:hfinkel@anl.gov" target="_blank" class="">hfinkel@anl.gov</a>>:<br class=""><blockquote type="cite" class="">----- Original Message -----<br class=""><blockquote type="cite" class="">From: "Zinovy Nis" <<a href="mailto:zinovy.nis@gmail.com" target="_blank" class="">zinovy.nis@gmail.com</a>><br class="">To: "Hal Finkel" <<a href="mailto:hfinkel@anl.gov" target="_blank" class="">hfinkel@anl.gov</a>><br class="">Cc: "LLVM Commits" <<a href="mailto:llvm-commits@cs.uiuc.edu" target="_blank" class="">llvm-commits@cs.uiuc.edu</a>>, "Tobias Grosser"<br class=""><<a href="mailto:tobias@grosser.es" target="_blank" class="">tobias@grosser.es</a>>, "Chandler Carruth"<br class=""><<a href="mailto:chandlerc@google.com" target="_blank" class="">chandlerc@google.com</a>>, "Nadav Rotem" <<a href="mailto:nrotem@apple.com" target="_blank" class="">nrotem@apple.com</a>>,<br class="">"Arnold Schwaighofer" <<a href="mailto:aschwaighofer@apple.com" target="_blank" class="">aschwaighofer@apple.com</a>><br class="">Sent: Monday, October 6, 2014 8:44:28 AM<br class="">Subject: Re: SLP/Loop vectorizer pass ordering<br class=""><br class="">A bit later. At least GVN creates critical edges which are not<br class="">handled<br class="">by loop vectorizer then.<br class=""></blockquote><br class="">Okay, please do (this is fairly important) -- if you can extract<br class="">some relevant IR, filing a bug report would be great. Are you<br class="">saying that running SLP early inhibits GVN from creating<br class="">critical edges that the loop vectorizer does not understand?<br class=""><br class="">Thanks again,<br class="">Hal<br class=""><br class=""><blockquote type="cite" class=""><br class="">2014-10-06 17:33 GMT+04:00 Hal Finkel <<a href="mailto:hfinkel@anl.gov" target="_blank" class="">hfinkel@anl.gov</a>>:<br class=""><blockquote type="cite" class="">----- Original Message -----<br class=""><blockquote type="cite" class="">From: "Zinovy Nis" <<a href="mailto:zinovy.nis@gmail.com" target="_blank" class="">zinovy.nis@gmail.com</a>><br class="">To: "Chandler Carruth" <<a href="mailto:chandlerc@google.com" target="_blank" class="">chandlerc@google.com</a>><br class="">Cc: "LLVM Commits" <<a href="mailto:llvm-commits@cs.uiuc.edu" target="_blank" class="">llvm-commits@cs.uiuc.edu</a>>, "Tobias<br class="">Grosser"<br class=""><<a href="mailto:tobias@grosser.es" target="_blank" class="">tobias@grosser.es</a>><br class="">Sent: Monday, October 6, 2014 8:19:24 AM<br class="">Subject: Re: SLP/Loop vectorizer pass ordering<br class=""><br class="">Please wait a while, I'm using it to revert the new order as<br class="">it<br class="">introduces regression in our internal benchmark: SLP was<br class="">creating<br class="">loop<br class="">vectorization opportunities when was called before LV. Now no<br class="">such<br class="">opportunities are available, so we've got a regression.<br class=""></blockquote><br class="">Interesting. Can you provide any further details?<br class=""><br class="">-Hal<br class=""><br class=""><blockquote type="cite" class=""><br class="">2014-10-06 3:28 GMT+04:00 Chandler Carruth<br class=""><<a href="mailto:chandlerc@google.com" target="_blank" class="">chandlerc@google.com</a>>:<br class=""><blockquote type="cite" class=""><br class="">On Thu, Sep 4, 2014 at 6:32 AM, James Molloy<br class=""><<a href="mailto:james@jamesmolloy.co.uk" target="_blank" class="">james@jamesmolloy.co.uk</a>><br class="">wrote:<br class=""><blockquote type="cite" class=""><br class="">Hi Hal, Chandler,<br class=""><br class="">r217144.<br class=""></blockquote><br class=""><br class="">Is anyone still using the option to disable this? If I don't<br class="">hear<br class="">anything,<br class="">I'll remove this option entirely in the next week.<br class=""><br class="">_______________________________________________<br class="">llvm-commits mailing list<br class=""><a href="mailto:llvm-commits@cs.uiuc.edu" target="_blank" class="">llvm-commits@cs.uiuc.edu</a><br class=""><a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits" target="_blank" class="">http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits</a><br class=""><br class=""></blockquote>_______________________________________________<br class="">llvm-commits mailing list<br class=""><a href="mailto:llvm-commits@cs.uiuc.edu" target="_blank" class="">llvm-commits@cs.uiuc.edu</a><br class=""><a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits" target="_blank" class="">http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits</a><br class=""><br class=""></blockquote><br class="">--<br class="">Hal Finkel<br class="">Assistant Computational Scientist<br class="">Leadership Computing Facility<br class="">Argonne National Laboratory<br class=""></blockquote><br class=""></blockquote><br class="">--<br class="">Hal Finkel<br class="">Assistant Computational Scientist<br class="">Leadership Computing Facility<br class="">Argonne National Laboratory<br class=""></blockquote></blockquote></blockquote><br class=""><br class=""></blockquote><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important" class="">--<span class=""> </span></span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important" class="">Hal Finkel</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important" class="">Assistant Computational Scientist</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important" class="">Leadership Computing Facility</span><br style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px" class=""><span style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important" class="">Argonne National Laboratory</span></div></blockquote></div><br class=""></div></blockquote></div>
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