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<h3>
Ben Gamari pushed to branch wip/T18527
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a647bae8518e96156eb7775c4cede52b69f711d7">a647bae8</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-08-06T14:01:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nativeGen: One approach to fix #18527
Previously the code generator could produce corrupt C call sequences due
to register overlap between MachOp lowerings and the platform's calling
convention. We fix this using a hack described in Note [Evaluate C-call
arguments before placing in destination registers].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4c85427db97c77b50239fe672b96b09e649806f">b4c85427</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-06T14:01:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test fo #18527
</pre>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78dd499beaafe7d85d70d52d1eafeb87c9fa3c30">78dd499b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-06T14:01:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix prog001
Previously it failed as the `ghc` package was not visible.
</pre>
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<h4>7 changed files:</h4>
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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="#2bae5947e9412f6deebf4db7dcb89d780913130f">
compiler/GHC/CmmToAsm/X86/CodeGen.hs
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<li class="file-stats">
<a href="#090bc0f4cd0ee7544ed8f4cc022124c133b89a1a">
<span class="new-file">
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testsuite/tests/codeGen/should_run/T18527.hs
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<a href="#3f6743d6b71aaa2ffbf8804557a03f78f0650e7b">
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testsuite/tests/codeGen/should_run/T18527.stdout
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<li class="file-stats">
<a href="#b13fc8f57381eb625640b8721789621457b81357">
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testsuite/tests/codeGen/should_run/T18527FFI.c
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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="#63c4ca170779aa86ceb6667030e03d20e30c5ea3">
testsuite/tests/concurrent/prog001/all.T
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<h4>Changes:</h4>
<li id="c898e00d01234ab22d3b485be68db3645f52f220">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/2e68f1bdd3f39522c8b27ab91e46c967fd805d1e...78dd499beaafe7d85d70d52d1eafeb87c9fa3c30#c898e00d01234ab22d3b485be68db3645f52f220"><strong>compiler/GHC/Cmm/MachOp.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -45,6 +45,9 @@ native code generators to handle.</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Most operations are parameterised by the 'Width' that they operate on.</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Some operations have separate signed and unsigned versions, and float</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and integer versions.</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that there are variety of places in the native code generator where we</span></span>
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<td class="diff-line-num new new_line" data-linenumber="50" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">assume that the code produced for a MachOp does not introduce new blocks.</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">MachOp</span></span>
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<li id="2bae5947e9412f6deebf4db7dcb89d780913130f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/2e68f1bdd3f39522c8b27ab91e46c967fd805d1e...78dd499beaafe7d85d70d52d1eafeb87c9fa3c30#2bae5947e9412f6deebf4db7dcb89d780913130f"><strong>compiler/GHC/CmmToAsm/X86/CodeGen.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="287" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -287,11 +287,11 @@ we construct as a separate data type and the actual control flow graph in the co</td>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead we now return the new basic block if a statement causes a change</span></span>
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the current block and use the block for all following statements.</span></span>
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<pre style="margin: 0;"> <span id="LC289" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For this reason genCCall is also split into two parts.</span></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">One for calls which *won't* change the basic blocks in</span></span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">which successive instructions will be placed.</span></span></span>
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">A different one for calls which *are* known to change the</span></span></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">basic block.</span></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For this reason genCCall is also split into two parts.<span class="idiff left right"> One for calls which</span></span></span>
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">*won't* change the basic blocks in which successive instructions will be</span></span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">placed (since they only evaluate CmmExpr, which can only contain MachOps, which</span></span></span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">cannot introduce basic blocks in their lowerings). A different one for calls</span></span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">which *are* known to change the </span>basic block.</span></span>
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295
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"></span>
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296
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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297
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<pre style="margin: 0;"> <span id="LC297" 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">@@ -1028,6 +1028,9 @@ getRegister' _ is32Bit (CmmMachOp mop [x, y]) = do -- dyadic MachOps</td>
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1028
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tmp. This is likely to be better, because the reg alloc can</span></span>
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1029
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1029
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> eliminate this reg->reg move here (it won't eliminate the other one,</span></span>
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1030
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1030
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<pre style="margin: 0;"> <span id="LC1030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because the move is into the fixed %ecx).</span></span>
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1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * in the case of C calls the use of ecx here can interfere with arguments.</span></span>
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We avoid this with the hack described in Note [Evaluate C-call</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> arguments before placing in destination registers]</span></span>
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1031
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -}</span></span>
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1032
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="n" style="color: #333;">shift_code</span> <span class="n" style="color: #333;">width</span> <span class="n" style="color: #333;">instr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="cm" style="color: #998; font-style: italic;">{-amount-}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"> <span class="n" style="color: #333;">x_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getAnyReg</span> <span class="n" style="color: #333;">x</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2022" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2025" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2022,6 +2025,7 @@ genCCall is32Bit (PrimTarget (MO_AtomicRMW width amop))</td>
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2022
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2025
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<pre style="margin: 0;"> <span id="LC2025" class="line" lang="haskell"> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getNewRegNat</span> <span class="n" style="color: #333;">format</span></span>
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2023
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2026
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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_code</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getAnyReg</span> <span class="n" style="color: #333;">n</span></span>
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2024
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2027
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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"> <span class="n" style="color: #333;">platform</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ncgPlatform</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getConfig</span></span>
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2028
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<pre style="margin: 0;">+<span id="LC2028" class="line" lang="haskell"></span>
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2029
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<pre style="margin: 0;"> <span id="LC2029" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dst_r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getRegisterReg</span> <span class="n" style="color: #333;">platform</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">dst</span><span class="p">)</span></span>
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2026
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2030
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<pre style="margin: 0;"> <span id="LC2030" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">code</span><span class="p">,</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">op_code</span> <span class="n" style="color: #333;">dst_r</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">amode</span></span>
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2027
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2031
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<pre style="margin: 0;"> <span id="LC2031" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</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;">arg_code</span> <span class="n" style="color: #333;">arg</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 class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">lbl</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2671" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2667,9 +2671,12 @@ genCCall' _ is32Bit target dest_regs args bid = do</td>
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2667
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2671
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<pre style="margin: 0;"> <span id="LC2671" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">code</span></span>
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2668
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2672
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<pre style="margin: 0;"> <span id="LC2672" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"genCCall: Wrong number of arguments/results for imul2"</span></span>
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2669
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2673
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<pre style="margin: 0;"> <span id="LC2673" class="line" lang="haskell"></span>
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2670
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<pre style="margin: 0;">-<span id="LC2670" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is32Bit</span></span>
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2671
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<pre style="margin: 0;">-<span id="LC2671" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">genCCall32'</span> <span class="n" style="color: #333;">target</span> <span class="n" style="color: #333;">dest_regs</span> <span class="n" style="color: #333;">args</span></span>
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2672
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<pre style="margin: 0;">-<span id="LC2672" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">genCCall64'</span> <span class="n" style="color: #333;">target</span> <span class="n" style="color: #333;">dest_regs</span> <span class="n" style="color: #333;">args</span></span>
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2674
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<pre style="margin: 0;">+<span id="LC2674" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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2675
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<pre style="margin: 0;">+<span id="LC2675" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">instrs0</span><span class="p">,</span> <span class="n" style="color: #333;">args'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">evalArgs</span> <span class="n" style="color: #333;">bid</span> <span class="n" style="color: #333;">args</span></span>
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2676
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<pre style="margin: 0;">+<span id="LC2676" class="line" lang="haskell"> <span class="n" style="color: #333;">instrs1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is32Bit</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2677" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2677
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<pre style="margin: 0;">+<span id="LC2677" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">genCCall32'</span> <span class="n" style="color: #333;">target</span> <span class="n" style="color: #333;">dest_regs</span> <span class="n" style="color: #333;">args'</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2678" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2678
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<pre style="margin: 0;">+<span id="LC2678" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">genCCall64'</span> <span class="n" style="color: #333;">target</span> <span class="n" style="color: #333;">dest_regs</span> <span class="n" style="color: #333;">args'</span></span>
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2679
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<pre style="margin: 0;">+<span id="LC2679" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">instrs0</span> <span class="p">`</span><span class="n" style="color: #333;">appOL</span><span class="p">`</span> <span class="n" style="color: #333;">instrs1</span><span class="p">)</span></span>
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2673
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2680
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<pre style="margin: 0;"> <span id="LC2680" class="line" lang="haskell"></span>
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2674
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2681
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<pre style="margin: 0;"> <span id="LC2681" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">divOp1</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">signed</span> <span class="n" style="color: #333;">width</span> <span class="n" style="color: #333;">results</span> <span class="p">[</span><span class="n" style="color: #333;">arg_x</span><span class="p">,</span> <span class="n" style="color: #333;">arg_y</span><span class="p">]</span></span>
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2675
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2682
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<pre style="margin: 0;"> <span id="LC2682" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">divOp</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">signed</span> <span class="n" style="color: #333;">width</span> <span class="n" style="color: #333;">results</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">arg_x</span> <span class="n" style="color: #333;">arg_y</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2732" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2739" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2732,6 +2739,83 @@ genCCall' _ is32Bit target dest_regs args bid = do</td>
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2732
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2739
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<pre style="margin: 0;"> <span id="LC2739" class="line" lang="haskell"> <span class="n" style="color: #333;">addSubIntC</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span></span>
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2733
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2740
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<pre style="margin: 0;"> <span id="LC2740" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"genCCall: Wrong number of arguments/results for addSubIntC"</span></span>
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2734
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2741
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<pre style="margin: 0;"> <span id="LC2741" class="line" lang="haskell"></span>
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2742
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<pre style="margin: 0;">+<span id="LC2742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2743
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<pre style="margin: 0;">+<span id="LC2743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Evaluate C-call arguments before placing in destination registers]</span></span>
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2744
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<pre style="margin: 0;">+<span id="LC2744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2745
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<pre style="margin: 0;">+<span id="LC2745" class="line" lang="haskell"></span>
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2746
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<pre style="margin: 0;">+<span id="LC2746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When producing code for C calls we must take care when placing arguments</span></span>
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2747
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<pre style="margin: 0;">+<span id="LC2747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in their final registers. Specifically, we must ensure that temporary register</span></span>
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2748
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<pre style="margin: 0;">+<span id="LC2748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">usage due to evaluation of one argument does not clobber a register in which we</span></span>
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2749
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<pre style="margin: 0;">+<span id="LC2749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">already placed a previous argument (e.g. as the code generation logic for</span></span>
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2750
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<pre style="margin: 0;">+<span id="LC2750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">MO_Shl can clobber %rcx due to x86 instruction limitations).</span></span>
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2751
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<pre style="margin: 0;">+<span id="LC2751" class="line" lang="haskell"></span>
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2752
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<pre style="margin: 0;">+<span id="LC2752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is precisely what happened in #18527. Consider this C--:</span></span>
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2753
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<pre style="margin: 0;">+<span id="LC2753" class="line" lang="haskell"></span>
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2754
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<pre style="margin: 0;">+<span id="LC2754" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (result::I64) = call "ccall" doSomething(_s2hp::I64, 2244, _s2hq::I64, _s2hw::I64 | (1 << _s2hz::I64));</span></span>
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2755
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<pre style="margin: 0;">+<span id="LC2755" class="line" lang="haskell"></span>
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2756
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<pre style="margin: 0;">+<span id="LC2756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we are calling the C function `doSomething` with three arguments, the last</span></span>
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2757
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<pre style="margin: 0;">+<span id="LC2757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">involving a non-trivial expression involving MO_Shl. In this case the NCG could</span></span>
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2758
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<pre style="margin: 0;">+<span id="LC2758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">naively generate the following assembly (where $tmp denotes some temporary</span></span>
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2759
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<pre style="margin: 0;">+<span id="LC2759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">register and $argN denotes the register for argument N, as dictated by the</span></span>
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2760
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<pre style="margin: 0;">+<span id="LC2760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">platform's calling convention):</span></span>
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2761
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<pre style="margin: 0;">+<span id="LC2761" class="line" lang="haskell"></span>
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2762
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<pre style="margin: 0;">+<span id="LC2762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mov _s2hp, $arg1 # place first argument</span></span>
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2763
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<pre style="margin: 0;">+<span id="LC2763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mov _s2hq, $arg2 # place second argument</span></span>
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2764
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<pre style="margin: 0;">+<span id="LC2764" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2765" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2765
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<pre style="margin: 0;">+<span id="LC2765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> # Compute 1 << _s2hz</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2766" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2766
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<pre style="margin: 0;">+<span id="LC2766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mov _s2hz, %rcx</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2767" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2767
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<pre style="margin: 0;">+<span id="LC2767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> shl %cl, $tmp</span></span>
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2768
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<pre style="margin: 0;">+<span id="LC2768" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2769" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2769
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<pre style="margin: 0;">+<span id="LC2769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> # Compute (_s2hw | (1 << _s2hz))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2770" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2770
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<pre style="margin: 0;">+<span id="LC2770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mov _s2hw, $arg3</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2771" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2771
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<pre style="margin: 0;">+<span id="LC2771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or $tmp, $arg3</span></span>
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2772
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<pre style="margin: 0;">+<span id="LC2772" class="line" lang="haskell"></span>
</pre>
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2773
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<pre style="margin: 0;">+<span id="LC2773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> # Perform the call</span></span>
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2774
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<pre style="margin: 0;">+<span id="LC2774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> call func</span></span>
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2775
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<pre style="margin: 0;">+<span id="LC2775" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2776" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2776
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<pre style="margin: 0;">+<span id="LC2776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This code is outright broken on Windows which assigns $arg1 to %rcx. This means</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2777" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2777
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<pre style="margin: 0;">+<span id="LC2777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that the evaluation of the last argument clobbers the first argument.</span></span>
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2778
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<pre style="margin: 0;">+<span id="LC2778" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2779" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2779
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<pre style="margin: 0;">+<span id="LC2779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To avoid this we use a rather awful hack: when producing code for a C call with</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2780" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2780
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<pre style="margin: 0;">+<span id="LC2780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">at least one non-trivial argument, we first evaluate all of the arguments into</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2781" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2781
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<pre style="margin: 0;">+<span id="LC2781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">local registers before moving them into their final calling-convention-defined</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2782" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2782
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<pre style="margin: 0;">+<span id="LC2782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">homes. This is performed by 'evalArgs'. Here we define "non-trivial" to be an</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2783" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2783
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<pre style="margin: 0;">+<span id="LC2783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expression which might contain a MachOp since these are the only cases which</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2784" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2784
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<pre style="margin: 0;">+<span id="LC2784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">might clobber registers. Furthermore, we use a conservative approximation of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2785" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2785
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<pre style="margin: 0;">+<span id="LC2785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this condition (only looking at the top-level of CmmExprs) to avoid spending</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2786" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2786
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<pre style="margin: 0;">+<span id="LC2786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">too much effort trying to decide whether we want to take the fast path.</span></span>
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2787
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<pre style="margin: 0;">+<span id="LC2787" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2788
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<pre style="margin: 0;">+<span id="LC2788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that this hack *also* applies to calls to out-of-line PrimTargets (which</span></span>
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2789
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<pre style="margin: 0;">+<span id="LC2789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are lowered via a C call) since outOfLineCmmOp produces the call via</span></span>
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2790
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<pre style="margin: 0;">+<span id="LC2790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(stmtToInstrs (CmmUnsafeForeignCall ...)), which will ultimately end up</span></span>
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2791
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<pre style="margin: 0;">+<span id="LC2791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">back in genCCall{32,64}.</span></span>
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2792
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<pre style="margin: 0;">+<span id="LC2792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2793
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<pre style="margin: 0;">+<span id="LC2793" class="line" lang="haskell"></span>
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2794
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<pre style="margin: 0;">+<span id="LC2794" class="line" lang="haskell"><span class="cd">-- | See Note [Evaluate C-call arguments before placing in destination registers]</span></span>
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2795
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<pre style="margin: 0;">+<span id="LC2795" class="line" lang="haskell"><span class="n" style="color: #333;">evalArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">BlockId</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CmmActual</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstrBlock</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CmmActual</span><span class="p">])</span></span>
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2796
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<pre style="margin: 0;">+<span id="LC2796" class="line" lang="haskell"><span class="n" style="color: #333;">evalArgs</span> <span class="n" style="color: #333;">bid</span> <span class="n" style="color: #333;">actuals</span></span>
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2797
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<pre style="margin: 0;">+<span id="LC2797" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">mightContainMachOp</span> <span class="n" style="color: #333;">actuals</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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2798
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<pre style="margin: 0;">+<span id="LC2798" class="line" lang="haskell"> <span class="n" style="color: #333;">regs_blks</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">evalArg</span> <span class="n" style="color: #333;">actuals</span></span>
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2799
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<pre style="margin: 0;">+<span id="LC2799" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">concatOL</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">regs_blks</span><span class="p">,</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">regs_blks</span><span class="p">)</span></span>
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2800
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<pre style="margin: 0;">+<span id="LC2800" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">nilOL</span><span class="p">,</span> <span class="n" style="color: #333;">actuals</span><span class="p">)</span></span>
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2801
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<pre style="margin: 0;">+<span id="LC2801" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2802
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<pre style="margin: 0;">+<span id="LC2802" class="line" lang="haskell"> <span class="n" style="color: #333;">mightContainMachOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2803
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<pre style="margin: 0;">+<span id="LC2803" class="line" lang="haskell"> <span class="n" style="color: #333;">mightContainMachOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmRegOff</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2804
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<pre style="margin: 0;">+<span id="LC2804" class="line" lang="haskell"> <span class="n" style="color: #333;">mightContainMachOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLit</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2805
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<pre style="margin: 0;">+<span id="LC2805" class="line" lang="haskell"> <span class="n" style="color: #333;">mightContainMachOp</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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2806
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<pre style="margin: 0;">+<span id="LC2806" class="line" lang="haskell"></span>
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2807
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<pre style="margin: 0;">+<span id="LC2807" class="line" lang="haskell"> <span class="n" style="color: #333;">evalArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CmmActual</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstrBlock</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CmmExpr</span><span class="p">)</span></span>
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2808
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<pre style="margin: 0;">+<span id="LC2808" class="line" lang="haskell"> <span class="n" style="color: #333;">evalArg</span> <span class="n" style="color: #333;">actual</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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2809
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<pre style="margin: 0;">+<span id="LC2809" class="line" lang="haskell"> <span class="n" style="color: #333;">platform</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPlatform</span></span>
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2810
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<pre style="margin: 0;">+<span id="LC2810" class="line" lang="haskell"> <span class="n" style="color: #333;">lreg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newLocalReg</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cmmExprType</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">actual</span></span>
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2811
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<pre style="margin: 0;">+<span id="LC2811" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">instrs</span><span class="p">,</span> <span class="n" style="color: #333;">bid'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">stmtToInstrs</span> <span class="n" style="color: #333;">bid</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">CmmAssign</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">lreg</span><span class="p">)</span> <span class="n" style="color: #333;">actual</span></span>
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2812
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<pre style="margin: 0;">+<span id="LC2812" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The above assignment shouldn't change the current block</span></span>
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2813
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<pre style="margin: 0;">+<span id="LC2813" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MASSERT</span><span class="p">(</span><span class="n" style="color: #333;">isNothing</span> <span class="n" style="color: #333;">bid'</span><span class="p">)</span></span>
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2814
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<pre style="margin: 0;">+<span id="LC2814" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">instrs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CmmReg</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">CmmLocal</span> <span class="n" style="color: #333;">lreg</span><span class="p">)</span></span>
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2815
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<pre style="margin: 0;">+<span id="LC2815" class="line" lang="haskell"></span>
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2816
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<pre style="margin: 0;">+<span id="LC2816" class="line" lang="haskell"> <span class="n" style="color: #333;">newLocalReg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CmmType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NatM</span> <span class="kt" style="color: #458; font-weight: 600;">LocalReg</span></span>
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2817
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<pre style="margin: 0;">+<span id="LC2817" class="line" lang="haskell"> <span class="n" style="color: #333;">newLocalReg</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LocalReg</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getUniqueM</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">ty</span></span>
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2818
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<pre style="margin: 0;">+<span id="LC2818" class="line" lang="haskell"></span>
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2735
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2819
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<pre style="margin: 0;"> <span id="LC2819" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [DIV/IDIV for bytes]</span></span>
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2736
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2820
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<pre style="margin: 0;"> <span id="LC2820" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2737
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2821
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<pre style="margin: 0;"> <span id="LC2821" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- IDIV reminder:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/2e68f1bdd3f39522c8b27ab91e46c967fd805d1e...78dd499beaafe7d85d70d52d1eafeb87c9fa3c30#090bc0f4cd0ee7544ed8f4cc022124c133b89a1a"><strong>testsuite/tests/codeGen/should_run/T18527.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 ForeignFunctionInterface #-}</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="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Bits</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">setBit</span><span class="p">)</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Word</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Word32</span><span class="p">)</span></span>
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7
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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;">Data.Int</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int64</span><span class="p">)</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">offending</span> <span class="mi" style="color: #099;">100</span> <span class="mi" style="color: #099;">0</span> <span class="mi" style="color: #099;">1</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="n" style="color: #333;">offending</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int64</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int64</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Word32</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">offending</span> <span class="n" style="color: #333;">h</span> <span class="n" style="color: #333;">i</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">oldMask</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sendMessage</span> <span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="mi" style="color: #099;">2245</span><span class="p">)</span> <span class="n" style="color: #333;">i</span> <span class="mi" style="color: #099;">0</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">newMask</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setBit</span> <span class="n" style="color: #333;">oldMask</span> <span class="p">(</span><span class="n" style="color: #333;">fromIntegral</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">sendMessage</span> <span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="mi" style="color: #099;">2244</span><span class="p">)</span> <span class="n" style="color: #333;">i</span> <span class="n" style="color: #333;">newMask</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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18
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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="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="s" style="color: #d14;">"func"</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="n" style="color: #333;">sendMessage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int64</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Word32</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int64</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int64</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;">Int64</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/2e68f1bdd3f39522c8b27ab91e46c967fd805d1e...78dd499beaafe7d85d70d52d1eafeb87c9fa3c30#3f6743d6b71aaa2ffbf8804557a03f78f0650e7b"><strong>testsuite/tests/codeGen/should_run/T18527.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">ffi call</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">ffi call</span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/2e68f1bdd3f39522c8b27ab91e46c967fd805d1e...78dd499beaafe7d85d70d52d1eafeb87c9fa3c30#b13fc8f57381eb625640b8721789621457b81357"><strong>testsuite/tests/codeGen/should_run/T18527FFI.c</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <stdio.h></span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <stdint.h></span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="c"></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">int64_t</span> <span class="nf" style="color: #900; font-weight: 600;">func</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int64_t</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">int64_t</span> <span class="n" style="color: #333;">c</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">int64_t</span> <span class="n" style="color: #333;">d</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"ffi call"</span><span class="p">);</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">" with corrupted convention</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="c"> <span class="n" style="color: #333;">printf</span><span class="p">(</span><span class="s" style="color: #d14;">"</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="c"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/2e68f1bdd3f39522c8b27ab91e46c967fd805d1e...78dd499beaafe7d85d70d52d1eafeb87c9fa3c30#b9bba9766faf563ab195fb1402f14fa78ad5c66f"><strong>testsuite/tests/codeGen/should_run/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="207" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="207" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -207,3 +207,4 @@ test('T16449_2', exit_code(0), compile_and_run, [''])</td>
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207
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207
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16846</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">optasm</span><span class="p">']),</span> <span class="nv" style="color: #008080;">exit_code</span><span class="p">(</span><span class="mi" style="color: #099;">1</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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208
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208
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="perl"></span>
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209
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209
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17920</span><span class="p">',</span> <span class="nv" style="color: #008080;">cmm_src</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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210
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18527</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 class="s1" style="color: #d14;">T18527FFI.c</span><span class="p">'])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/2e68f1bdd3f39522c8b27ab91e46c967fd805d1e...78dd499beaafe7d85d70d52d1eafeb87c9fa3c30#63c4ca170779aa86ceb6667030e03d20e30c5ea3"><strong>testsuite/tests/concurrent/prog001/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">@@ -16,4 +16,4 @@ test('concprog001', [extra_files(['Arithmetic.hs', 'Converter.hs', 'Mult.hs', 'S</td>
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16
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="perl"> <span class="nv" style="color: #008080;">when</span><span class="p">(</span><span class="nv" style="color: #008080;">fast</span><span class="p">(),</span> <span class="nv" style="color: #008080;">skip</span><span class="p">),</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">threaded2</span><span class="p">']),</span></span>
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17
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="perl"> <span class="nv" style="color: #008080;">fragile</span><span class="p">(</span><span class="mi" style="color: #099;">16604</span><span class="p">),</span></span>
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18
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="perl"> <span class="nv" style="color: #008080;">run_timeout_multiplier</span><span class="p">(</span><span class="mi" style="color: #099;">2</span><span class="p">)],</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="perl"> <span class="nv" style="color: #008080;">multimod_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">Mult</span><span class="p">',</span> <span class="p">''])</span></span></pre>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="perl"> <span class="nv" style="color: #008080;">multimod_compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">Mult</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;"><span class="idiff left right">-package ghc</span></span><span class="p">'])</span></span></pre>
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