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<h3>
Andreas Klebinger pushed to branch wip/andreask/tune_layout
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbf471f0405600776b0f6a91aa31b5e2a902194c">fbf471f0</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-04-21T11:34:45+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NCG: Codelayout: Distinguish conditional and other branches.
In #18053 we ended up with a suboptimal code layout because
the code layout algorithm didn't distinguish between conditional
and unconditional control flow.
We can completely eliminate unconditional control flow instructions
by placing blocks next to each other, not so much for conditionals.
In terms of implementation we simply give conditional branches less
weight before computing the layout.
Fixes #18053
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<h4>1 changed file:</h4>
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<a href="#5986ebaacfa99d264abfd2f7ef19d99a64db720f">
compiler/GHC/CmmToAsm/BlockLayout.hs
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<h4>Changes:</h4>
<li id="5986ebaacfa99d264abfd2f7ef19d99a64db720f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbf471f0405600776b0f6a91aa31b5e2a902194c#5986ebaacfa99d264abfd2f7ef19d99a64db720f"><strong>compiler/GHC/CmmToAsm/BlockLayout.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -240,7 +240,44 @@ import Control.Monad (foldM)</td>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Assuming that Lwork is large the chance that the "call" ends up</span></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the same cache line is also fairly small.</span></span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~ Note [Layout relevant edge weights]</span></span>
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The input to the chain based code layout algorithm is a CFG</span></span>
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with edges annotated with their frequency. The frequency</span></span>
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of traversal corresponds quite well to the cost of not placing</span></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the connected blocks next to each other.</span></span>
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However even if having the same frequency certain edges are</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inherently more or less relevant to code layout.</span></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In particular:</span></span>
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Edges which cross an info table are less relevant than others.</span></span>
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we place the blocks across this edge next to each other</span></span>
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> they are still separated by the info table which negates</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> much of the benefit. It makes it less likely both blocks</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> will share a cache line reducing the benefits from locality.</span></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But it also prevents us from eliminating jump instructions.</span></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"></span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Conditional branches and switches are slightly less relevant.</span></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We can completely remove unconditional jumps by placing them</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next to each other. This is not true for conditional branch edges.</span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We apply a small modifier to them to ensure edges for which we can</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> eliminate the overhead completely are considered first. See also #18053.</span></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"></span>
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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Edges constituted by a call are ignored.</span></span>
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273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"></span>
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274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Considering these hardly helped with performance and ignoring</span></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> them helps quite a bit to improve compiler performance.</span></span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we perform a preprocessing step where we apply a multiplicator</span></span>
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278
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to these kinds of edges.</span></span>
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279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"></span>
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280
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -}</span></span>
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244
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281
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="haskell"></span>
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245
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282
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"></span>
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246
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283
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"><span class="cd">-- | Look at X number of blocks in two chains to determine</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="654" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="691" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -654,17 +691,31 @@ sequenceChain info weights' blocks@((BasicBlock entry _):_) =</td>
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654
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691
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<pre style="margin: 0;"> <span id="LC691" class="line" lang="haskell"> <span class="n" style="color: #333;">directEdges</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"> <span class="n" style="color: #333;">directEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sortBy</span> <span class="p">(</span><span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">compare</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">relevantWeight</span> <span class="o" style="font-weight: 600;">$</span> <span class="p">(</span><span class="n" style="color: #333;">infoEdgeList</span> <span class="n" style="color: #333;">weights</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Apply modifiers to turn edge frequencies into useable weights</span></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for computing code layout.</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [Layout relevant edge weights]</span></span>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"> <span class="n" style="color: #333;">relevantWeight</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span></span>
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"> <span class="n" style="color: #333;">relevantWeight</span> <span class="n" style="color: #333;">edge</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">edgeInfo</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EdgeInfo</span> <span class="kt" style="color: #458; font-weight: 600;">CmmSource</span> <span class="p">{</span> <span class="n" style="color: #333;">trans_cmmNode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CmmCall</span> <span class="p">{}</span> <span class="p">}</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">edgeInfo</span></span>
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<pre style="margin: 0;">-<span id="LC660" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Ignore edges across calls</span></span>
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Ignore edges across calls<span class="idiff left right">.</span></span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">mapMember</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">info</span></span>
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">edgeWeight</span> <span class="n" style="color: #333;">edgeInfo</span></span>
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<pre style="margin: 0;">-<span id="LC664" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The payoff is small if we jump over an info table</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The payoff is <span class="idiff left right">quite </span>small if we jump over an info table</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">edgeInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">edgeWeight</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">/</span><span class="mi" style="color: #099;">8</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EdgeInfo</span> <span class="kt" style="color: #458; font-weight: 600;">CmmSource</span> <span class="p">{</span> <span class="n" style="color: #333;">trans_cmmNode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exitNode</span> <span class="p">}</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">edgeInfo</span></span>
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cantEliminate</span> <span class="n" style="color: #333;">exitNode</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">edgeWeight</span> <span class="n" style="color: #333;">edgeInfo</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A small penalty to edge types which</span></span>
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we can't optimize away by layout.</span></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- w * 0.96875 == w - w/32</span></span>
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CfgEdge</span> <span class="n" style="color: #333;">from</span> <span class="n" style="color: #333;">to</span> <span class="n" style="color: #333;">edgeInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">edgeWeight</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">*</span> <span class="mf" style="color: #099;">0.96875</span> <span class="p">})</span></span>
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713
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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714
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">edge</span></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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716
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="n" style="color: #333;">cantEliminate</span> <span class="kt" style="color: #458; font-weight: 600;">CmmCondBranch</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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717
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"> <span class="n" style="color: #333;">cantEliminate</span> <span class="kt" style="color: #458; font-weight: 600;">CmmSwitch</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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718
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"> <span class="n" style="color: #333;">cantEliminate</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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668
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719
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"></span>
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669
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720
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"> <span class="n" style="color: #333;">blockMap</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LabelMap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GenBasicBlock</span> <span class="n" style="color: #333;">i</span><span class="p">)</span></span>
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670
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721
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"> <span class="n" style="color: #333;">blockMap</span></span>
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