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<h3>
Andreas Klebinger pushed to branch wip/andreask/xchg_primop
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/c9a41cf4add38fd82706dc15204628835cae9ede">c9a41cf4</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-05-19T16:48:57+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make exchange an IO action as it should be.
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<h4>4 changed files:</h4>
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<a href="#451725cc4e5d443a3b7c2adcdf224840f953b7e2">
compiler/GHC/Builtin/primops.txt.pp
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<li class="file-stats">
<a href="#c898e00d01234ab22d3b485be68db3645f52f220">
compiler/GHC/Cmm/MachOp.hs
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<li class="file-stats">
<a href="#d12a108e34fe83acc9c99357ae841e22a0af0a23">
compiler/GHC/StgToCmm/Prim.hs
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<li class="file-stats">
<a href="#2d838bb8165073c4e5672387ae3340ad8d483b01">
libraries/base/GHC/Ptr.hs
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<h4>Changes:</h4>
<li id="451725cc4e5d443a3b7c2adcdf224840f953b7e2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9a41cf4add38fd82706dc15204628835cae9ede#451725cc4e5d443a3b7c2adcdf224840f953b7e2"><strong>compiler/GHC/Builtin/primops.txt.pp</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">@@ -2473,14 +2473,14 @@ primop WriteOffAddrOp_Word64 "writeWord64OffAddr#" GenPrimOp</td>
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<pre style="margin: 0;"> <span id="LC2473" class="line" lang="puppet"><span class="s1" style="color: #d14;"> with has_side_effects = True</span></span>
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<pre style="margin: 0;"> <span id="LC2474" class="line" lang="puppet"><span class="s1" style="color: #d14;"> can_fail = True</span></span>
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<pre style="margin: 0;"> <span id="LC2475" class="line" lang="puppet"></span>
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<pre style="margin: 0;">-<span id="LC2476" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop InterlockedExchangeAddr "interlockedExchangeAddr#" GenPrimOp</span></span>
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<pre style="margin: 0;">-<span id="LC2477" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Addr# -> Addr# -> <span class="idiff left right">Addr#</span></span></span>
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<pre style="margin: 0;">+<span id="LC2476" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop InterlockedExchange<span class="idiff left right">_</span>Addr "interlockedExchangeAddr#" GenPrimOp</span></span>
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<pre style="margin: 0;">+<span id="LC2477" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Addr# -> Addr# -> <span class="idiff left right">State# s -> (# State# s, Addr# #)</span></span></span>
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<pre style="margin: 0;"> <span id="LC2478" class="line" lang="puppet"><span class="s1" style="color: #d14;"> {The atomic exchange operation. Atomically exchanges the value at the first address</span></span>
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<pre style="margin: 0;"> <span id="LC2479" class="line" lang="puppet"><span class="s1" style="color: #d14;"> with the Addr# given as second argument. Implies a read barrier.}</span></span>
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<pre style="margin: 0;"> <span id="LC2480" class="line" lang="puppet"><span class="s1" style="color: #d14;"> with has_side_effects = True</span></span>
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<pre style="margin: 0;"> <span id="LC2481" class="line" lang="puppet"></span>
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<pre style="margin: 0;">-<span id="LC2482" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop InterlockedExchangeInt "interlockedExchangeInt#" GenPrimOp</span></span>
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<pre style="margin: 0;">-<span id="LC2483" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Addr# -> Int# -> <span class="idiff left right">Int#</span></span></span>
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<pre style="margin: 0;">+<span id="LC2482" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop InterlockedExchange<span class="idiff left right">_</span>Int "interlockedExchangeInt#" GenPrimOp</span></span>
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<pre style="margin: 0;">+<span id="LC2483" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Addr# -> Int# -> <span class="idiff left right">State# s -> (# State# s, Int# #)</span></span></span>
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<pre style="margin: 0;"> <span id="LC2484" class="line" lang="puppet"><span class="s1" style="color: #d14;"> {The atomic exchange operation. Atomically exchanges the value at the address</span></span>
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<pre style="margin: 0;"> <span id="LC2485" class="line" lang="puppet"><span class="s1" style="color: #d14;"> with the given value. Returns the old value. Implies a read barrier.}</span></span>
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<pre style="margin: 0;"> <span id="LC2486" class="line" lang="puppet"><span class="s1" style="color: #d14;"> with has_side_effects = True</span></span>
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<li id="c898e00d01234ab22d3b485be68db3645f52f220">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9a41cf4add38fd82706dc15204628835cae9ede#c898e00d01234ab22d3b485be68db3645f52f220"><strong>compiler/GHC/Cmm/MachOp.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">@@ -633,7 +633,7 @@ data CallishMachOp</td>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MO_AtomicWrite</span> <span class="kt" style="color: #458; font-weight: 600;">Width</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MO_Cmpxchg</span> <span class="kt" style="color: #458; font-weight: 600;">Width</span></span>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Should be an AtomicRMW variant eventually.</span></span>
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Has at least aquire semantics.</span></span>
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Has at least a<span class="idiff left right">c</span>quire semantics.</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MO_Xchg</span> <span class="kt" style="color: #458; font-weight: 600;">Width</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"></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">@@ -857,9 +857,9 @@ emitPrimOp dflags = \case</td>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="n" style="color: #333;">emitPrimCall</span> <span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_UF_Conv</span> <span class="kt" style="color: #458; font-weight: 600;">W64</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">w</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Atomic operations</span></span>
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InterlockedExchangeAddr</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">src</span><span class="p">,</span> <span class="n" style="color: #333;">value</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">opAllDone</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InterlockedExchange<span class="idiff left right">_</span>Addr</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">src</span><span class="p">,</span> <span class="n" style="color: #333;">value</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">opAllDone</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="n" style="color: #333;">emitPrimCall</span> <span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_Xchg</span> <span class="p">(</span><span class="n" style="color: #333;">wordWidth</span> <span class="n" style="color: #333;">platform</span><span class="p">))</span> <span class="p">[</span><span class="n" style="color: #333;">src</span><span class="p">,</span> <span class="n" style="color: #333;">value</span><span class="p">]</span></span>
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862
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InterlockedExchangeInt</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">src</span><span class="p">,</span> <span class="n" style="color: #333;">value</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">opAllDone</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InterlockedExchange<span class="idiff left right">_</span>Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">src</span><span class="p">,</span> <span class="n" style="color: #333;">value</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">opAllDone</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"> <span class="n" style="color: #333;">emitPrimCall</span> <span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_Xchg</span> <span class="p">(</span><span class="n" style="color: #333;">wordWidth</span> <span class="n" style="color: #333;">platform</span><span class="p">))</span> <span class="p">[</span><span class="n" style="color: #333;">src</span><span class="p">,</span> <span class="n" style="color: #333;">value</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SIMD primops</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c9a41cf4add38fd82706dc15204628835cae9ede#2d838bb8165073c4e5672387ae3340ad8d483b01"><strong>libraries/base/GHC/Ptr.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE Unsafe #-}</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, NoImplicitPrelude, MagicHash, RoleAnnotations #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_HADDOCK not-home #-}</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</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">@@ -169,9 +170,11 @@ castPtrToFunPtr (Ptr addr) = FunPtr addr</td>
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169
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170
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Atomic operations for Ptr</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE exchangePtr #-}</span></span>
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">exchangePtr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">c</span></span>
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173
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"><span class="n" style="color: #333;">exchangePtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">dst</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">val</span><span class="p">)</span></span>
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174
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="p">(</span><span class="n" style="color: #333;">interlockedExchangeAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">dst</span> <span class="n" style="color: #333;">val</span><span class="p">)</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="n" style="color: #333;">exchangePtr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">exchangePtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">dst</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">val</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">interlockedExchangeAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">dst</span> <span class="n" style="color: #333;">val</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">s2</span><span class="p">,</span> <span class="n" style="color: #333;">old_val</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</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;">s2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">old_val</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Show instances for Ptr and FunPtr</span></span>
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