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<div style="font-size: 16px; font-family: Calibri, sans-serif;">How about:</div>
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<div><font face="Consolas" style="font-size: 14px;">--- a/docs/Frontend/PerformanceTips.rst</font></div>
<div><font face="Consolas" style="font-size: 14px;">+++ b/docs/Frontend/PerformanceTips.rst</font></div>
<div><font face="Consolas" style="font-size: 14px;">@@ -19,20 +19,32 @@ Avoid loads and stores of large aggregate type</font></div>
<div><font face="Consolas" style="font-size: 14px;"> ================================================</font></div>
<div><font face="Consolas" style="font-size: 14px;"> </font></div>
<div><font face="Consolas" style="font-size: 14px;"> LLVM currently does not optimize well loads and stores of large :ref:`aggregate</font></div>
<div><font face="Consolas" style="font-size: 14px;"> types <t_aggregate>` (i.e. structs and arrays). As an alternative, consider </font></div>
<div><font face="Consolas" style="font-size: 14px;"> loading individual fields from memory.</font></div>
<div><font face="Consolas" style="font-size: 14px;"> </font></div>
<div><font face="Consolas" style="font-size: 14px;"> Aggregates that are smaller than the largest (performant) load or store </font></div>
<div><font face="Consolas" style="font-size: 14px;"> instruction supported by the targeted hardware are well supported. These can </font></div>
<div><font face="Consolas" style="font-size: 14px;"> be an effective way to represent collections of small packed fields. </font></div>
<div><font face="Consolas" style="font-size: 14px;"> </font></div>
<div><font face="Consolas" style="font-size: 14px;">+Issue alloca in the entry basic block</font></div>
<div><font face="Consolas" style="font-size: 14px;">+=======================================</font></div>
<div><font face="Consolas" style="font-size: 14px;">+</font></div>
<div><font face="Consolas" style="font-size: 14px;">+Issue alloca instructions in the entry basic block of a function. Also, issue</font></div>
<div><font face="Consolas" style="font-size: 14px;">+them before any call instructions. Call instructions might get inlined into</font></div>
<div><font face="Consolas" style="font-size: 14px;">+multiple basic blocks. The end result is that a following alloca instruction</font></div>
<div><font face="Consolas" style="font-size: 14px;">+would no longer be in the entry basic block afterward.</font></div>
<div><font face="Consolas" style="font-size: 14px;">+</font></div>
<div><font face="Consolas" style="font-size: 14px;">+The SROA (Scalar Replacement Of Aggregates) pass only attempts to elminate</font></div>
<div><font face="Consolas" style="font-size: 14px;">+alloca instructions that are in the entry basic block. Following optimizations</font></div>
<div><font face="Consolas" style="font-size: 14px;">+passes relies on such alloca instructions to have been eliminated.</font></div>
<div><font face="Consolas" style="font-size: 14px;">+</font></div>
<div><font face="Consolas" style="font-size: 14px;"> Prefer zext over sext when legal</font></div>
<div><font face="Consolas" style="font-size: 14px;"> ==================================</font></div>
<div><font face="Consolas" style="font-size: 14px;"> </font></div>
<div><font face="Consolas" style="font-size: 14px;"> On some architectures (X86_64 is one), sign extension can involve an extra </font></div>
<div><font face="Consolas" style="font-size: 14px;"> instruction whereas zero extension can be folded into a load. LLVM will try to</font></div>
<div><font face="Consolas" style="font-size: 14px;"> replace a sext with a zext when it can be proven safe, but if you have </font></div>
<div><font face="Consolas" style="font-size: 14px;"> information in your source language about the range of a integer value, it can </font></div>
<div><font face="Consolas" style="font-size: 14px;"> be profitable to use a zext rather than a sext. </font></div>
<div><font face="Consolas" style="font-size: 14px;"> </font></div>
<div><font face="Consolas" style="font-size: 14px;"> Alternatively, you can :ref:`specify the range of the value using metadata </font></div>
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<span style="font-weight:bold">From: </span><<a href="mailto:mehdi.amini@apple.com">mehdi.amini@apple.com</a>> on behalf of Mehdi Amini <<a href="mailto:mehdi.amini@apple.com">mehdi.amini@apple.com</a>><br>
<span style="font-weight:bold">Date: </span>mardi 8 septembre 2015 13:27<br>
<span style="font-weight:bold">To: </span>Benoit Belley <<a href="mailto:benoit.belley@autodesk.com">benoit.belley@autodesk.com</a>><br>
<span style="font-weight:bold">Cc: </span>Philip Reames <<a href="mailto:listmail@philipreames.com">listmail@philipreames.com</a>>, "<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>" <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [llvm-dev] LLVM struct, alloca, SROA and the entry basic block<br>
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Hi,
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<blockquote type="cite" class="">
<div class="">On Sep 8, 2015, at 10:11 AM, Benoit Belley via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:</div>
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<div class=""><span style="font-family: Calibri; font-size: 11pt; font-weight: bold;" class="">From:
</span><span style="font-family: Calibri; font-size: 11pt;" class="">Philip Reames <</span><a href="mailto:listmail@philipreames.com" style="font-family: Calibri; font-size: 11pt;" class="">listmail@philipreames.com</a><span style="font-family: Calibri; font-size: 11pt;" class="">></span></div>
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<span style="font-weight:bold" class="">Date: </span>mardi 8 septembre 2015 12:50<br class="">
<span style="font-weight:bold" class="">To: </span>Benoit Belley <<a href="mailto:benoit.belley@autodesk.com" class="">benoit.belley@autodesk.com</a>>, "<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>" <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>><br class="">
<span style="font-weight:bold" class="">Subject: </span>Re: [llvm-dev] LLVM struct, alloca, SROA and the entry basic block<br class="">
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<blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;" class="" type="cite">
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<div text="#000000" bgcolor="#FFFFFF" class="">
<div class="moz-cite-prefix">On 09/08/2015 07:21 AM, Benoit Belley via llvm-dev wrote:<br class="">
</div>
<blockquote cite="mid:D2146725.50382%25benoit.belley@autodesk.com" type="cite" class="">
<div style="font-family: Calibri, sans-serif; font-size: 16px;" class="">Hi everyone,</div>
<div style="font-family: Calibri, sans-serif; font-size: 16px;" class=""><br class="">
</div>
<div style="font-family: Calibri, sans-serif; font-size: 16px;" class="">We have noticed that the SROA pass will only eliminate ‘alloca’ instructions if those are located in the entry basic block of a function.</div>
<div style="font-family: Calibri, sans-serif; font-size: 16px;" class=""><br class="">
</div>
<div class=""><i class=""><font face="Calibri,sans-serif" class=""><b class="">As a general recommendation, should the LLVM IR emitted by our compiler always place ‘alloca’ instructions in the entry basic block ? (I couldn’t find any recommendations concerning
this matter.)</b></font></i></div>
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<font face="Calibri,sans-serif" class="">Yes. </font><br class="">
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<div class="">Thanks Phil. Should this be mentioned somewhere in the documentation ? As a footnote in the LLVM Language Reference manual maybe ?</div>
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<div>This sounds like a candidate for: <a href="http://llvm.org/docs/Frontend/PerformanceTips.html" class="">http://llvm.org/docs/Frontend/PerformanceTips.html</a> ?</div>
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</div>
<div>— </div>
<div>Mehdi</div>
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<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; font-size: 16px; font-family: Calibri, sans-serif;" class="">
<div class="">As a note, I have also find out that alloca instructions should be placed before any call instructions as these can get inlined and then, the original alloca can no longer by placed in the entry basic block!</div>
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<div class="">
<div text="#000000" bgcolor="#FFFFFF" class=""><font face="Calibri,sans-serif" class=""><i class=""><b class=""><br class="">
</b></i></font>
<blockquote cite="mid:D2146725.50382%25benoit.belley@autodesk.com" type="cite" class="">
<div class=""><i class=""><font face="Calibri,sans-serif" class=""><br class="">
</font></i></div>
<div class=""><font face="Calibri,sans-serif" class="">In addition, we have noticed that the MemCpy pass will attempt to copy LLVM struct using moves that are as large as possible. </font>For example, a struct of 3 floats is copied using a 64-bit and a 32-bit
move. It is therefore important that such a struct be aligned on 8-byte boundary, not just 4 bytes! Else, one runs the risk of triggering store-forwarding failure pipelining stalls (which we did encountered really badly with one of our internal performance
benchmark).</div>
</blockquote>
This sounds like a bug to me. We shouldn't be using the large load/stores without knowing they're aligned or that unaligned access is fast on a particular target. Where this is best fixed (memcpy, store lowering?) I don't know.
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<div class="">I’ll send out a test case. Maybe, that will help.</div>
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<div text="#000000" bgcolor="#FFFFFF" class=""><br class="">
<blockquote cite="mid:D2146725.50382%25benoit.belley@autodesk.com" type="cite" class="">
<div class=""><br class="">
</div>
<div class=""><b class=""><i class="">Is there any guidelines for specifying the alignment of LLVM structs allocated by alloca instructions ? Is rounding down to the structure size to the next power of 2 a good strategy ? Will the MemCpy pass issue moves of
up to 64-bytes on AVX-512 capable processors ?</i></b></div>
<div class=""><b class=""><i class=""><br class="">
</i></b></div>
<div class="">Cheers,</div>
<div class="">Benoit<i style="font-weight: bold;" class=""> </i></div>
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