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<h3>
Ben Gamari pushed to branch wip/memory-barriers
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/42cf1ff857af2b5c07c35c2c23b65a3e0c5a9a53">42cf1ff8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-08T20:25:17Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Threads: Shuffle barrier
It seems clearer if it's closer to its use site
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</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/c9f875564d3b0fd677336a085f89b1dc473b04c8">c9f87556</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-08T20:25:44Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Evac: Drop redundant barrier in serial path
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</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/088044baf5965f72331cee8fbd813e63f38905c6">088044ba</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-08T20:26:05Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge branch 'wip/memory-barriers' of gitlab.haskell.org:ghc/ghc into wip/memory-barriers
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<h4>2 changed files:</h4>
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<a href="#a5d219117032120cc7bde9f13451d9627cff5614">
rts/Threads.c
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<a href="#37a93df244a7789fddf557443b6398d06763e9cc">
rts/sm/Evac.c
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<h4>Changes:</h4>
<li id="a5d219117032120cc7bde9f13451d9627cff5614">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/37fb6754b2d9bbe752114f02f942cf8be990ef1f...088044baf5965f72331cee8fbd813e63f38905c6#a5d219117032120cc7bde9f13451d9627cff5614"><strong>rts/Threads.c</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">@@ -765,8 +765,6 @@ bool performTryPutMVar(Capability *cap, StgMVar *mvar, StgClosure *value)</td>
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="c"> <span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">head</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="c"><span class="n" style="color: #333;">loop</span><span class="o" style="font-weight: 600;">:</span></span>
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<pre style="margin: 0;">-<span id="LC768" class="line" lang="c"> <span class="n" style="color: #333;">qinfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">q</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span><span class="p">;</span></span>
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769
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<pre style="margin: 0;">-<span id="LC769" class="line" lang="c"> <span class="n" style="color: #333;">load_load_barrier</span><span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;">==</span> <span class="p">(</span><span class="n" style="color: #333;">StgMVarTSOQueue</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_END_TSO_QUEUE_closure</span><span class="p">)</span> <span class="p">{</span></span>
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771
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* No further takes, the MVar is now full. */</span></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">==</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MVAR_CLEAN_info</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="777" 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="775" 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">@@ -777,6 +775,9 @@ loop:</td>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="c"> <span class="n" style="color: #333;">unlockClosure</span><span class="p">((</span><span class="n" style="color: #333;">StgClosure</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">mvar</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MVAR_DIRTY_info</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="nb" style="color: #0086b3;">true</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="c"> <span class="n" style="color: #333;">qinfo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">q</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="c"> <span class="n" style="color: #333;">load_load_barrier</span><span class="p">();</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">qinfo</span> <span class="o" style="font-weight: 600;">==</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_IND_info</span> <span class="o" style="font-weight: 600;">||</span></span>
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="c"> <span class="n" style="color: #333;">qinfo</span> <span class="o" style="font-weight: 600;">==</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MSG_NULL_info</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="c"> <span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">StgMVarTSOQueue</span><span class="o" style="font-weight: 600;">*</span><span class="p">)((</span><span class="n" style="color: #333;">StgInd</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">q</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">indirectee</span><span class="p">;</span></span>
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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">@@ -130,12 +130,9 @@ copy_tag(StgClosure **p, const StgInfoTable *info,</td>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// if somebody else reads the forwarding pointer, we better make</span></span>
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// sure there's a closure at the end of it.</span></span>
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<pre style="margin: 0;">-<span id="LC135" class="line" lang="c"> <span class="n" style="color: #333;">write_barrier</span><span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC136" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">TAG_CLOSURE</span><span class="p">(</span><span class="n" style="color: #333;">tag</span><span class="p">,(</span><span class="n" style="color: #333;">StgClosure</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">to</span><span class="p">);</span></span>
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137
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="c"> <span class="n" style="color: #333;">src</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">StgInfoTable</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">MK_FORWARDING_PTR</span><span class="p">(</span><span class="n" style="color: #333;">to</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC138" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">TAG_CLOSURE</span><span class="p">(</span><span class="n" style="color: #333;">tag</span><span class="p">,(</span><span class="n" style="color: #333;">StgClosure</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">to</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif </span><span class="cm" style="color: #998; font-style: italic;">/* defined(PARALLEL_GC) */</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(PROFILING)</span></span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// We store the size of the just evacuated object in the LDV word so that</span></span>
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