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<h3>
Marge Bot pushed to branch wip/marge_bot_batch_merge_job
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1e55dabfc033bc2ca09b1d9a9e292f2cbfd6279e">1e55dabf</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-04-21T00:48:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: drop note about not supporting shared libraries on unix systems
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c01b636fbb80e7c43e918adca97add2457aaf97a">c01b636f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T00:48:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use ParserFlags in GHC.Runtime.Eval (#17957)
Instead of passing `DynFlags` to functions such as `isStmt` and
`hasImport` in `GHC.Runtime.Eval` we pass `ParserFlags`. It's a much
simpler structure that can be created purely with `mkParserFlags'`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1abbb1a2821f7e1b0e2a620c300edd1e22486d15">1abbb1a2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T00:48:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Runtime: avoid DynFlags (#17957)
* add `getPlatform :: TcM Platform` helper
* remove unused `DynFlags` parameter from `emptyPLS`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c46a988c1eeefdc7b1e1cc48e938c824b455f72">2c46a988</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T00:48:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid DynFlags in Ppr code (#17957)
* replace `DynFlags` parameters with `SDocContext` parameters for a few
Ppr related functions: `bufLeftRenderSDoc`, `printSDoc`,
`printSDocLn`, `showSDocOneLine`.
* remove the use of `pprCols :: DynFlags -> Int` in Outputable. We
already have the information via `sdocLineLength :: SDocContext ->
Int`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6c78675d2d18f70e6e007a71f98b18c681d5f0e">f6c78675</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T00:48:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid using sdocWithDynFlags (#17957)
Remove one use of `sdocWithDynFlags` from `GHC.CmmToLlvm.llvmCodeGen'`
and from `GHC.Driver.CodeOutput.profilingInitCode`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15723a0d2870153ecb1763670d0f8e0328a5f45b">15723a0d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T00:48:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid `sdocWithDynFlags` in `pprCLbl` (#17957)
* add a `DynFlags` parameter to `pprCLbl`
* put `maybe_underscore` and `pprAsmCLbl` in a `where` clause to avoid
`DynFlags` parameters
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8062f7d50ca1cf56e1532847a4187b0efb6778f0">8062f7d5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T00:48:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmToAsm DynFlags refactoring (#17957)
* Remove `DynFlags` parameter from `isDynLinkName`: `isDynLinkName` used
to test the global `ExternalDynamicRefs` flag. Now we test it outside of
`isDynLinkName`
* Add new fields into `NCGConfig`: current unit id, sse/bmi versions,
externalDynamicRefs, etc.
* Replace many uses of `DynFlags` by `NCGConfig`
* Moved `BMI/SSE` datatypes into `GHC.Platform`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a6ca45ae9ca25e40e566d5b63283309f2bb1ea9">8a6ca45a</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-21T00:48:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark DataCon wrappers CONLIKE
Now that DataCon wrappers don’t inline until phase 0 (see commit
b78cc64e923716ac0512c299f42d4d0012306c05), it’s important that
case-of-known-constructor and RULE matching be able to see saturated
applications of DataCon wrappers in unfoldings. Making them conlike is a
natural way to do it, since they are, in fact, precisely the sort of
thing the CONLIKE pragma exists to solve.
Fixes #18012.
This also bumps the version of the parsec submodule to incorporate a
patch that avoids a metric increase on the haddock perf tests. The
increase was not really a flaw in this patch, as parsec was implicitly
relying on inlining heuristics. The patch to parsec just adds some
INLINABLE pragmas, and we get a nice performance bump out of it (well
beyond the performance we lost from this patch).
Metric Decrease:
T12234
WWRec
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e39d2140e754152a8984061e341e8eab48f504a">0e39d214</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-21T00:48:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do eager instantation in terms
This patch implements eager instantiation, a small but critical change
to the type inference engine, #17173. The main change is this:
When inferring types, always return an instantiated type
(for now, deeply instantiated; in future shallowly instantiated)
There is more discussion in
https://www.tweag.io/posts/2020-04-02-lazy-eager-instantiation.html
There is quite a bit of refactoring in this patch:
* The ir_inst field of GHC.Tc.Utils.TcType.InferResultk
has entirely gone. So tcInferInst and tcInferNoInst have collapsed
into tcInfer.
* Type inference of applications, via tcInferApp and
tcInferAppHead, are substantially refactored, preparing
the way for Quick Look impredicativity.
* New pure function GHC.Tc.Gen.Expr.collectHsArgs and applyHsArgs
are beatifully dual. We can see the zipper!
* GHC.Tc.Gen.Expr.tcArgs is now much nicer; no longer needs to return
a wrapper
* In HsExpr, HsTypeApp now contains the the actual type argument,
and is used in desugaring, rather than putting it in a mysterious
wrapper.
* I struggled a bit with good error reporting in
Unify.matchActualFunTysPart. It's a little bit simpler than before,
but still not great.
Some smaller things
* Rename tcPolyExpr --> tcCheckExpr
tcMonoExpr --> tcLExpr
* tcPatSig moves from GHC.Tc.Gen.HsType to GHC.Tc.Gen.Pat
Metric Decrease:
T9961
Reduction of 1.6% in comiler allocation on T9961, I think.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e2805c9e38ccce5be462a45d002a25e0924d322">0e2805c9</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-21T00:48:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add "ddump-cmm-opt" as alias for "ddump-opt-cmm".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4dc279646d0ce1ba7af81173f08e607beef08dc">c4dc2796</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T00:48:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">MachO linker: display section name
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/226a97320f1a34173b96f6658b137c3a528ebd55">226a9732</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-21T00:48:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Remove -fast-llvm flag
Issue #18076 drew my attention to the undocumented `-fast-llvm` flag for
the LLVM code generator introduced in
22733532171330136d87533d523f565f2a4f102f. Speaking to Moritz about this,
the motivation for this flag was to avoid potential incompatibilities
between LLVM and the assembler/linker toolchain by making LLVM
responsible for machine-code generation.
Unfortunately, this cannot possibly work: the LLVM backend's mangler
performs a number of transforms on the assembler generated by LLVM that
are necessary for correctness. These are currently:
* mangling Haskell functions' symbol types to be `object` instead of
`function` on ELF platforms (necessary for tables-next-to-code)
* mangling AVX instructions to ensure that we don't assume alignment
(which LLVM otherwise does)
* mangling Darwin's subsections-via-symbols directives
Given that these are all necessary I don't believe that we can support
`-fast-llvm`. Let's rather remove it.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#db697f6aea9f93f1583f1d5c62d25570a1e07f73">
compiler/GHC/Cmm/CLabel.hs
</a>
</li>
<li class="file-stats">
<a href="#2d3721ad8de95e1144493ca545db846672cb109f">
compiler/GHC/Cmm/Info/Build.hs
</a>
</li>
<li class="file-stats">
<a href="#10b61652f9817945bb54ccf8fc40f8a664ca3c30">
compiler/GHC/CmmToAsm.hs
</a>
</li>
<li class="file-stats">
<a href="#7223682bb3d11ed5bc80db47627d3d9ef7fa2ac7">
compiler/GHC/CmmToAsm/Config.hs
</a>
</li>
<li class="file-stats">
<a href="#ea29061dab1b843e0ea9294afc614998f3a8d08f">
compiler/GHC/CmmToAsm/Monad.hs
</a>
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<li class="file-stats">
<a href="#ce4acbced40df8012ccc56db501549f835fb180b">
compiler/GHC/CmmToAsm/PIC.hs
</a>
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<li class="file-stats">
<a href="#f71fa75baa7807186473f09c45a9ada1b72f4c6c">
compiler/GHC/CmmToAsm/PPC/CodeGen.hs
</a>
</li>
<li class="file-stats">
<a href="#e76eae04dea432f874db91c25e4a5725d7cc127b">
compiler/GHC/CmmToAsm/SPARC/CodeGen.hs
</a>
</li>
<li class="file-stats">
<a href="#2bae5947e9412f6deebf4db7dcb89d780913130f">
compiler/GHC/CmmToAsm/X86/CodeGen.hs
</a>
</li>
<li class="file-stats">
<a href="#1aff3a222f2ec5c5498930c3d145b401cc300028">
compiler/GHC/CmmToLlvm.hs
</a>
</li>
<li class="file-stats">
<a href="#b5ac041c7f79084a7a7626eda4cdadda3457d235">
compiler/GHC/CmmToLlvm/Base.hs
</a>
</li>
<li class="file-stats">
<a href="#11ffe98a94d798427bc600e4fcfe899407536346">
compiler/GHC/Core/SimpleOpt.hs
</a>
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<li class="file-stats">
<a href="#1a7aba0daeafab195716dd25432479804a55ab60">
compiler/GHC/Core/Utils.hs
</a>
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<li class="file-stats">
<a href="#9df7e695170800345fb44916a8e8f4b8f3c55be0">
compiler/GHC/Driver/CodeOutput.hs
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<li class="file-stats">
<a href="#9a679a2680ef6061397f1987091ea9f96ffe095d">
compiler/GHC/Driver/Main.hs
</a>
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<li class="file-stats">
<a href="#6be70a83724991a1d1900d0c7c21e99b64b326a0">
compiler/GHC/Driver/Packages.hs
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<li class="file-stats">
<a href="#b8e6af642e56019828828dc679683c04afb81867">
compiler/GHC/Driver/Pipeline.hs
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<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
</a>
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<li class="file-stats">
<a href="#d798290c6a51284ce2f486104ed4a796ceb080e2">
compiler/GHC/Driver/Session.hs-boot
</a>
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<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
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<li class="file-stats">
<a href="#7a1af22e4c32b9aa6ec708d9d3788e1c4db5da9a">
compiler/GHC/Hs/Utils.hs
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<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<li class="file-stats">
<a href="#16b273b96a1c03d4261e2ac6de4cc456ba2dd014">
compiler/GHC/Rename/Splice.hs
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<li class="file-stats">
<a href="#173c7eb846a4e9b5fee79688a72cbf6a326e4e1e">
compiler/GHC/Runtime/Eval.hs
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<a href="#8858278b4cb7284f96b29b5564bcb426de4fae70">
compiler/GHC/Runtime/Heap/Inspect.hs
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<li class="file-stats">
<a href="#3556223cd3ef45d787321b5290bf33535a361873">
compiler/GHC/Runtime/Linker.hs
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<a href="#ab7f5bb638d3dce352affbd617434b76735301b0">
compiler/GHC/Stg/Syntax.hs
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<li class="file-stats">
<a href="#3aa56839e36b2219f9ad54f5646ef3005da9c672">
compiler/GHC/Tc/Deriv/Generate.hs
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<li class="file-stats">
<a href="#71fa5eb3ba70e1d3a6181a226c2c227d42f1eb7d">
compiler/GHC/Tc/Gen/Arrow.hs
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<li class="file-stats">
<a href="#83f745d921da7adb739e81f83e1c07e723e4a789">
compiler/GHC/Tc/Gen/Bind.hs
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<h5>The diff was not included because it is too large.</h5>
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