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<h3>
Andreas Klebinger pushed to branch wip/andreask/winio_atomics
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/b21c38891e68cd21fe4ff29921ad845ae4e43c34">b21c3889</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-09-29T17:34:11+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">WinIO: Small changes related to atomic request swaps.
Move the atomix exchange over the Ptr type to an internal module.
Fix a bug caused by us passing ptr-to-ptr instead of ptr to
atomic exchange.
Renamed interlockedExchange to exchangePtr.
I've also added an cas primitive. It turned out we don't need it
for WinIO but I'm leaving it in as it's useful for other things.
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<h4>12 changed files:</h4>
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<li class="file-stats">
<a href="#451725cc4e5d443a3b7c2adcdf224840f953b7e2">
compiler/GHC/Builtin/primops.txt.pp
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<li class="file-stats">
<a href="#2bae5947e9412f6deebf4db7dcb89d780913130f">
compiler/GHC/CmmToAsm/X86/CodeGen.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="#c23bed179e65cee1485463017184f320e3184b8f">
libraries/base/GHC/Event/Internal.hs
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<li class="file-stats">
<a href="#a244a38181401b1a8d77645c71b6e87cf6d2a4ba">
libraries/base/GHC/Event/Windows.hsc
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<li class="file-stats">
<a href="#2d838bb8165073c4e5672387ae3340ad8d483b01">
libraries/base/GHC/Ptr.hs
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<li class="file-stats">
<a href="#54f2593fa6d429b2b82cc2200e8bcda0f38854de">
libraries/ghc-prim/changelog.md
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<li class="file-stats">
<a href="#f1a58396995a574bd2a6b5003487ac0e96a19c89">
testsuite/tests/codeGen/should_compile/cg011.hs
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<li class="file-stats">
<a href="#b9bba9766faf563ab195fb1402f14fa78ad5c66f">
testsuite/tests/codeGen/should_run/all.T
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<li class="file-stats">
<a href="#4581ee3dc23f57c8363cfca026c25cdaae786ec3">
<span class="new-file">
+
testsuite/tests/codeGen/should_run/cas_int.hs
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<li class="file-stats">
<a href="#65be1e7f44edfbf67ab5f1b524914caf9a035fff">
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testsuite/tests/codeGen/should_run/cas_int.stdout
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<li class="file-stats">
<a href="#64433b16af3d5ece34713e4d2ae786012c0e913c">
testsuite/tests/codeGen/should_run/cgrun080.hs
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<h4>Changes:</h4>
<li id="451725cc4e5d443a3b7c2adcdf224840f953b7e2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#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">@@ -2527,18 +2527,40 @@ primop WriteOffAddrOp_Word64 "writeWord64OffAddr#" GenPrimOp</td>
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<pre style="margin: 0;"> <span id="LC2527" 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="LC2528" 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="LC2529" class="line" lang="puppet"></span>
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<pre style="margin: 0;">-<span id="LC2530" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop InterlockedExchange_Addr "<span class="idiff left right">interlocked</span>ExchangeAddr#" GenPrimOp</span></span>
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<pre style="margin: 0;">+<span id="LC2530" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop InterlockedExchange_Addr "<span class="idiff left right">atomic</span>ExchangeAddr#" GenPrimOp</span></span>
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<pre style="margin: 0;"> <span id="LC2531" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Addr# -> Addr# -> State# s -> (# State# s, Addr# #)</span></span>
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<td class="diff-line-num old_line" data-linenumber="2532" 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">
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<td class="diff-line-num new_line" data-linenumber="2532" 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">
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<pre style="margin: 0;"> <span id="LC2532" 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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<td class="diff-line-num old_line" data-linenumber="2533" 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">
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<pre style="margin: 0;"> <span id="LC2533" 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="LC2534" 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="LC2535" class="line" lang="puppet"></span>
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<pre style="margin: 0;">-<span id="LC2536" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop InterlockedExchange_Int "<span class="idiff left right">interlocked</span>ExchangeInt#" GenPrimOp</span></span>
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<pre style="margin: 0;">+<span id="LC2536" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop InterlockedExchange_Int "<span class="idiff left right">atomic</span>ExchangeInt#" GenPrimOp</span></span>
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<pre style="margin: 0;"> <span id="LC2537" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Addr# -> Int# -> State# s -> (# State# s, Int# #)</span></span>
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<pre style="margin: 0;"> <span id="LC2538" 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="LC2539" 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="LC2540" 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="LC2541" class="line" lang="puppet"></span>
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<pre style="margin: 0;">+<span id="LC2542" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop AtomicCompareExchange_Int "atomicCasInt#" GenPrimOp</span></span>
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<pre style="margin: 0;">+<span id="LC2543" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Addr# -> Int# -> Int# -> State# s -> (# State# s, Int# #)</span></span>
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<pre style="margin: 0;">+<span id="LC2544" class="line" lang="puppet"><span class="s1" style="color: #d14;"> { Compare and swap on a word-sized memory location.</span></span>
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<pre style="margin: 0;">+<span id="LC2545" class="line" lang="puppet"></span>
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<pre style="margin: 0;">+<span id="LC2546" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Use as atomicCasInt# location expected desired</span></span>
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<pre style="margin: 0;">+<span id="LC2547" class="line" lang="puppet"></span>
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<pre style="margin: 0;">+<span id="LC2548" class="line" lang="puppet"><span class="s1" style="color: #d14;"> This version always returns the old value read. This follows the normal protocol for CAS operations (and matches the underlying instruction on most architectures).</span></span>
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2549
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<pre style="margin: 0;">+<span id="LC2549" class="line" lang="puppet"></span>
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2550
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<pre style="margin: 0;">+<span id="LC2550" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Implies a full memory barrier.}</span></span>
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2551
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<pre style="margin: 0;">+<span id="LC2551" class="line" lang="puppet"><span class="s1" style="color: #d14;"> with has_side_effects = True</span></span>
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2552
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<pre style="margin: 0;">+<span id="LC2552" class="line" lang="puppet"></span>
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2553
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<pre style="margin: 0;">+<span id="LC2553" class="line" lang="puppet"><span class="s1" style="color: #d14;">primop AtomicCompareExchange_Addr "atomicCasAddr#" GenPrimOp</span></span>
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2554
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<pre style="margin: 0;">+<span id="LC2554" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Addr# -> Addr# -> Addr# -> State# s -> (# State# s, Addr# #)</span></span>
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<pre style="margin: 0;">+<span id="LC2555" class="line" lang="puppet"><span class="s1" style="color: #d14;"> { Compare and swap on a word-sized memory location.</span></span>
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2556
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<pre style="margin: 0;">+<span id="LC2556" class="line" lang="puppet"></span>
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2557
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<pre style="margin: 0;">+<span id="LC2557" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Use as atomicCasAddr# location expected desired</span></span>
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2558
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<pre style="margin: 0;">+<span id="LC2558" class="line" lang="puppet"></span>
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2559
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<pre style="margin: 0;">+<span id="LC2559" class="line" lang="puppet"><span class="s1" style="color: #d14;"> This version always returns the old value read. This follows the normal protocol for CAS operations (and matches the underlying instruction on most architectures).</span></span>
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2560
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<pre style="margin: 0;">+<span id="LC2560" class="line" lang="puppet"></span>
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2561
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<pre style="margin: 0;">+<span id="LC2561" class="line" lang="puppet"><span class="s1" style="color: #d14;"> Implies a full memory barrier.}</span></span>
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2562
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<pre style="margin: 0;">+<span id="LC2562" class="line" lang="puppet"><span class="s1" style="color: #d14;"> with has_side_effects = True</span></span>
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2563
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<pre style="margin: 0;">+<span id="LC2563" class="line" lang="puppet"></span>
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2542
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2564
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<pre style="margin: 0;"> <span id="LC2564" class="line" lang="puppet"><span class="s1" style="color: #d14;">------------------------------------------------------------------------</span></span>
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2543
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2565
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<pre style="margin: 0;"> <span id="LC2565" class="line" lang="puppet"><span class="s1" style="color: #d14;">section "Mutable variables"</span></span>
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2544
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2566
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<pre style="margin: 0;"> <span id="LC2566" class="line" lang="puppet"><span class="s1" style="color: #d14;"> {Operations on MutVar\#s.}</span></span>
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<li id="2bae5947e9412f6deebf4db7dcb89d780913130f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#2bae5947e9412f6deebf4db7dcb89d780913130f"><strong>compiler/GHC/CmmToAsm/X86/CodeGen.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">@@ -2561,6 +2561,8 @@ genCCall' config is32Bit (PrimTarget (MO_Xchg width)) [dst] [addr, value] _</td>
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2561
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<pre style="margin: 0;"> <span id="LC2561" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Copy the value into the target register, perform the exchange.</span></span>
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2562
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2562
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<pre style="margin: 0;"> <span id="LC2562" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">code</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toOL</span></span>
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2563
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<pre style="margin: 0;"> <span id="LC2563" class="line" lang="haskell"> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">MOV</span> <span class="n" style="color: #333;">format</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="n" style="color: #333;">newval</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpReg</span> <span class="n" style="color: #333;">dst_r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2564" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- On X86 xchg implies a lock prefix if we use a memory argument.</span></span>
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<pre style="margin: 0;">+<span id="LC2565" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so this is atomic.</span></span>
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2566
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<pre style="margin: 0;"> <span id="LC2566" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">XCHG</span> <span class="n" style="color: #333;">format</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OpAddr</span> <span class="n" style="color: #333;">amode</span><span class="p">)</span> <span class="n" style="color: #333;">dst_r</span></span>
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<pre style="margin: 0;"> <span id="LC2567" class="line" lang="haskell"> <span class="p">]</span></span>
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2566
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2568
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<pre style="margin: 0;"> <span id="LC2568" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addr_code</span> <span class="p">`</span><span class="n" style="color: #333;">appOL</span><span class="p">`</span> <span class="n" style="color: #333;">newval_code</span> <span class="p">`</span><span class="n" style="color: #333;">appOL</span><span class="p">`</span> <span class="n" style="color: #333;">code</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#d12a108e34fe83acc9c99357ae841e22a0af0a23"><strong>compiler/GHC/StgToCmm/Prim.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">@@ -850,6 +850,10 @@ emitPrimOp dflags primop = case primop of</td>
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<pre style="margin: 0;"> <span id="LC850" 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="LC851" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InterlockedExchange_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;">opIntoRegs</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="LC852" 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="LC853" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AtomicCompareExchange_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;">dst</span><span class="p">,</span> <span class="n" style="color: #333;">expected</span><span class="p">,</span> <span class="n" style="color: #333;">new</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">opIntoRegs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"> <span class="n" style="color: #333;">emitPrimCall</span> <span class="p">[</span><span class="n" style="color: #333;">res</span><span class="p">]</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MO_Cmpxchg</span> <span class="p">(</span><span class="n" style="color: #333;">wordWidth</span> <span class="n" style="color: #333;">platform</span><span class="p">))</span> <span class="p">[</span><span class="n" style="color: #333;">dst</span><span class="p">,</span> <span class="n" style="color: #333;">expected</span><span class="p">,</span> <span class="n" style="color: #333;">new</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AtomicCompareExchange_Addr</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">[</span><span class="n" style="color: #333;">dst</span><span class="p">,</span> <span class="n" style="color: #333;">expected</span><span class="p">,</span> <span class="n" style="color: #333;">new</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">opIntoRegs</span> <span class="o" style="font-weight: 600;">$</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="LC856" 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_Cmpxchg</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;">dst</span><span class="p">,</span> <span class="n" style="color: #333;">expected</span><span class="p">,</span> <span class="n" style="color: #333;">new</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SIMD primops</span></span>
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VecBroadcastOp</span> <span class="n" style="color: #333;">vcat</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">w</span><span class="p">)</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;">e</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">opIntoRegs</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 class="kr" style="font-weight: 600;">do</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#c23bed179e65cee1485463017184f320e3184b8f"><strong>libraries/base/GHC/Event/Internal.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 ExistentialQuantification, NoImplicitPrelude #-}</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 MagicHash #-}</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;">{-# LANGUAGE UnboxedTuples #-}</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="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Event.Internal</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"> <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">@@ -13,6 +15,9 @@ module GHC.Event.Internal</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">module</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Event</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Internal</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Types</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Helpers</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">throwErrnoIfMinus1NoRetry</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Atomic ptr exchange for WinIO</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exchangePtr</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.C.Error</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">eINTR</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getErrno</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">throwErrno</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">@@ -21,6 +26,8 @@ import GHC.Base</td>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Num</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Num</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Event.Internal.Types</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Ptr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="cd">-- | Event notification backend.</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Backend</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="n" style="color: #333;">_beState</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">a</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">@@ -95,3 +102,12 @@ throwErrnoIfMinus1NoRetry loc f = do</td>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"> <span class="n" style="color: #333;">err</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getErrno</span></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">err</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">eINTR</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">throwErrno</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC106" 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="LC107" class="line" lang="haskell"><span class="cd">-- | @exchangePtr pptr x@ swaps the pointer pointed to by @pptr@ with the value</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @x@, returning the old value.</span></span>
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<pre style="margin: 0;">+<span id="LC109" 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;">a</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;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC110" 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="LC111" 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="LC112" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">atomicExchangeAddr</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="LC113" 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></pre>
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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">@@ -306,10 +306,6 @@ foreign import ccall safe "completeSynchronousRequest"</td>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="plaintext">cdOffset :: Int</span>
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<pre style="margin: 0;"> <span id="LC307" class="line" lang="plaintext">cdOffset = #{const __builtin_offsetof (HASKELL_OVERLAPPED, hoData)}</span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="plaintext"></span>
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309
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="plaintext">-- | Terminator symbol for IOCP request</span>
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310
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="plaintext">nullReq :: Ptr (Ptr a)</span>
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311
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<pre style="margin: 0;">-<span id="LC311" class="line" lang="plaintext">nullReq = castPtr $ unsafePerformIO $ new $ (nullPtr :: Ptr ())</span>
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<pre style="margin: 0;">-<span id="LC312" class="line" lang="plaintext"></span>
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313
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="plaintext">-- I don't expect a lot of events, so a simple linked lists should be enough.</span>
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314
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310
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="plaintext">type EventElements = [(Event, HandleData)]</span>
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311
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<pre style="margin: 0;"> <span id="LC311" class="line" lang="plaintext">data EventData = EventData { evtTopLevel :: !Event, evtElems :: !EventElements }</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">@@ -667,7 +663,7 @@ withOverlappedEx mgr fname h offset startCB completionCB = do</td>
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663
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="plaintext"> -- the pointer.</span>
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668
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664
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="plaintext"> debugIO $ "## Waiting for cancellation record... "</span>
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665
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<pre style="margin: 0;"> <span id="LC665" class="line" lang="plaintext"> _ <- FFI.getOverlappedResult h lpol True</span>
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670
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<pre style="margin: 0;">-<span id="LC670" class="line" lang="plaintext"> oldDataPtr <- <span class="idiff left right">exchangePtr ptr_lpol nullReq</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="plaintext"> oldDataPtr <- <span class="idiff left right">I.exchangePtr ptr_lpol nullPtr</span></span>
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671
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="plaintext"> when (oldDataPtr == cdData) $</span>
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672
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668
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="plaintext"> do reqs <- removeRequest</span>
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<pre style="margin: 0;"> <span id="LC669" class="line" lang="plaintext"> debugIO $ "-1.. " ++ show reqs ++ " requests queued after error."</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">@@ -1039,7 +1035,7 @@ processCompletion Manager{..} n delay = do</td>
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1039
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="plaintext"> ++ " offset: " ++ show cdOffset</span>
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1040
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="plaintext"> ++ " cdData: " ++ show cdDataCheck</span>
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1041
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="plaintext"> ++ " at idx " ++ show idx</span>
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1042
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<pre style="margin: 0;">-<span id="LC1042" class="line" lang="plaintext"> oldDataPtr <- <span class="idiff left right">exchangePtr ptr_lpol nullReq</span> :: IO (Ptr CompletionData)</span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="plaintext"> oldDataPtr <- <span class="idiff left right">I.exchangePtr ptr_lpol nullPtr</span> :: IO (Ptr CompletionData)</span>
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1043
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="plaintext"> debugIO $ ":: oldDataPtr " ++ show oldDataPtr</span>
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1044
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="plaintext"> when (oldDataPtr /= nullPtr) $</span>
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1045
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="plaintext"> do debugIO $ "exchanged: " ++ show oldDataPtr</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#2d838bb8165073c4e5672387ae3340ad8d483b01"><strong>libraries/base/GHC/Ptr.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">@@ -25,8 +25,6 @@ module GHC.Ptr (</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Unsafe functions</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">castFunPtrToPtr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">castPtrToFunPtr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC28" 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="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exchangePtr</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Base</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">@@ -164,16 +162,6 @@ castFunPtrToPtr (FunPtr addr) = Ptr addr</td>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="n" style="color: #333;">castPtrToFunPtr</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;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FunPtr</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="n" style="color: #333;">castPtrToFunPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">addr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FunPtr</span> <span class="n" style="color: #333;">addr</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC167" 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="LC168" 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="LC169" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC170" 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="LC171" 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="LC172" 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="LC173" 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="LC174" 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="LC175" 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="LC176" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC165" 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="LC166" 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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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#54f2593fa6d429b2b82cc2200e8bcda0f38854de"><strong>libraries/ghc-prim/changelog.md</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">@@ -21,8 +21,8 @@</td>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="markdown"><span class="p">-</span> Add primops for atomic exchange:</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="markdown"></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="markdown"><span class="sb" style="color: #d14;"> <span class="idiff left right">interlocked</span>ExchangeAddr# :: Addr# -> Addr# -> State# s -> (# State# s, Addr# #)</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="markdown"><span class="sb" style="color: #d14;"> <span class="idiff left right">interlocked</span>ExchangeInt# :: Addr# -> Int# -> State# s -> (# State# s, Int# #)</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="markdown"><span class="sb" style="color: #d14;"> <span class="idiff left right">atomic</span>ExchangeAddr# :: Addr# -> Addr# -> State# s -> (# State# s, Addr# #)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="markdown"><span class="sb" style="color: #d14;"> <span class="idiff left right">atomic</span>ExchangeInt# :: Addr# -> Int# -> State# s -> (# State# s, Int# #)</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="markdown"><span class="p">-</span> Add an explicit fixity for <span class="sb" style="color: #d14;">`(~)`</span> and <span class="sb" style="color: #d14;">`(~~)`</span>: </span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="markdown"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#f1a58396995a574bd2a6b5003487ac0e96a19c89"><strong>testsuite/tests/codeGen/should_compile/cg011.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 CPP, MagicHash, BlockArguments, UnboxedTuples #-}</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Tests compilation for <span class="idiff left right">interlockedE</span>xchange primop.</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Tests compilation for <span class="idiff left right">atomic e</span>xchange primop.</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">M</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">interlocked</span>ExchangeInt</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">State</span><span class="o" style="font-weight: 600;">#</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">atomic</span>ExchangeInt</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">State</span><span class="o" style="font-weight: 600;">#</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">swap</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">State</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">swap</span> <span class="n" style="color: #333;">ptr</span> <span class="n" style="color: #333;">val</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">interlocked</span>ExchangeInt</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ptr</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="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">swap</span> <span class="n" style="color: #333;">ptr</span> <span class="n" style="color: #333;">val</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">atomic</span>ExchangeInt</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ptr</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="LC11" 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="o" style="font-weight: 600;">#</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#b9bba9766faf563ab195fb1402f14fa78ad5c66f"><strong>testsuite/tests/codeGen/should_run/all.T</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">@@ -90,6 +90,7 @@ test('cgrun077', [when(have_cpu_feature('bmi2'), extra_hc_opts('-mbmi2'))], comp</td>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">cgrun078</span><span class="p">',</span> <span class="nv" style="color: #008080;">omit_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">ghci</span><span class="p">']),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">cgrun079</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">cgrun080</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">cas_int</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T1852</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T1861</span><span class="p">',</span> <span class="nv" style="color: #008080;">extra_run_opts</span><span class="p">('</span><span class="s1" style="color: #d14;">0</span><span class="p">'),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#4581ee3dc23f57c8363cfca026c25cdaae786ec3"><strong>testsuite/tests/codeGen/should_run/cas_int.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 CPP, MagicHash, BlockArguments, UnboxedTuples #-}</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, MagicHash, BlockArguments, ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Test the atomic exchange primop.</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;">-- We initialize a value with 1, and then perform exchanges on it</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with two different values. At the end all the values should still</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- be present.</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">main</span> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Bits</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Int</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prim</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Word</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Concurrent</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.Marshal.Alloc</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.Storable</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">sort</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Ptr</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"MachDeps.h"</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="n" style="color: #333;">alloca</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;">ptr_p</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="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="n" style="color: #333;">alloca</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">ptr_i</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="n" style="color: #333;">alloca</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">ptr_j</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="n" style="color: #333;">poke</span> <span class="n" style="color: #333;">ptr_i</span> <span class="p">(</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="n" style="color: #333;">poke</span> <span class="n" style="color: #333;">ptr_j</span> <span class="p">(</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--expected to swap</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"> <span class="n" style="color: #333;">res_i</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cas</span> <span class="n" style="color: #333;">ptr_i</span> <span class="mi" style="color: #099;">1</span> <span class="mi" style="color: #099;">3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expected to fail</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="n" style="color: #333;">res_j</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cas</span> <span class="n" style="color: #333;">ptr_j</span> <span class="mi" style="color: #099;">1</span> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="n" style="color: #333;">putStrLn</span> <span class="s" style="color: #d14;">"Returned results:"</span></span>
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41
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--(1,2)</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">res_i</span><span class="p">,</span> <span class="n" style="color: #333;">res_j</span><span class="p">)</span></span>
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43
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;"><-</span><span class="n" style="color: #333;">peek</span> <span class="n" style="color: #333;">ptr_i</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="n" style="color: #333;">j</span> <span class="o" style="font-weight: 600;"><-</span><span class="n" style="color: #333;">peek</span> <span class="n" style="color: #333;">ptr_j</span></span>
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46
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"> <span class="n" style="color: #333;">putStrLn</span> <span class="s" style="color: #d14;">"Stored results:"</span></span>
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48
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--(3,2)</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">i</span><span class="p">,</span><span class="n" style="color: #333;">j</span><span class="p">)</span></span>
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50
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="n" style="color: #333;">cas</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">cas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">ptr</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">expected</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">desired</span><span class="p">)</span><span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC53" 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 class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">atomicCasInt</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ptr</span> <span class="n" style="color: #333;">expected</span> <span class="n" style="color: #333;">desired</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="LC54" 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;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">old_val</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#65be1e7f44edfbf67ab5f1b524914caf9a035fff"><strong>testsuite/tests/codeGen/should_run/cas_int.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">Returned results:</span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">(1,2)</span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">Stored results:</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">(3,2)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b21c38891e68cd21fe4ff29921ad845ae4e43c34#64433b16af3d5ece34713e4d2ae786012c0e913c"><strong>testsuite/tests/codeGen/should_run/cgrun080.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">@@ -46,6 +46,6 @@ swapN n val ptr = do</td>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="n" style="color: #333;">swap</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="n" style="color: #333;">swap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">ptr</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">val</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC49" 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 class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">interlocked</span>ExchangeInt</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ptr</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="LC49" 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 class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">atomic</span>ExchangeInt</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ptr</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="LC50" 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;">I</span><span class="o" style="font-weight: 600;">#</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="LC51" class="line" lang="haskell"></span></pre>
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