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<h3>
Sebastian Graf pushed to branch wip/T18086
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/d830bbc9921bcc59164a0a18f0e0874ae4ce226e">d830bbc9</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-05-23T13:36:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: fix formatting and add some links
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49301ad6226d9a83d110bee8c419615dd94f5ded">49301ad6</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2020-05-23T13:37:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement cstringLength# and FinalPtr
This function and its accompanying rule resolve issue #5218.
A future PR to the bytestring library will make the internal
Data.ByteString.Internal.unsafePackAddress compute string length
with cstringLength#. This will improve the status quo because it is
eligible for constant folding.
Additionally, introduce a new data constructor to ForeignPtrContents
named FinalPtr. This additional data constructor, when used in the
IsString instance for ByteString, leads to more Core-to-Core
optimization opportunities, fewer runtime allocations, and smaller
binaries.
Also, this commit re-exports all the functions from GHC.CString
(including cstringLength#) in GHC.Exts. It also adds a new test
driver. This test driver is used to perform substring matches on Core
that is dumped after all the simplifier passes. In this commit, it is
used to check that constant folding of cstringLength# works.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcd6bdcce57430d08b335014625722c487ea08e4">dcd6bdcc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:37:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">simplCore: Ignore ticks in rule templates
This fixes #17619, where a tick snuck in to the template of a rule,
resulting in a panic during rule matching. The tick in question was
introduced via post-inlining, as discussed in `Note [Simplifying
rules]`. The solution we decided upon was to simply ignore ticks in the
rule template, as discussed in `Note [Tick annotations in RULE
matching]`.
Fixes #18162.
Fixes #17619.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82cb8913b38d44ef20e928ff8b08f3f0770ebf80">82cb8913</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-23T13:38:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18145 and also avoid needless work with implicit vars
- `forAllOrNothing` now is monadic, so we can trace whether we bind
an explicit `forall` or not.
- #18145 arose because the free vars calculation was needlessly
complex. It is now greatly simplified.
- Replaced some other implicit var code with `filterFreeVarsToBind`.
Co-authored-by: Ryan Scott <ryan.gl.scott@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a60dc83552c38af9bbc159bd4e092531196db9c0">a60dc835</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:39:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Fixes #17926.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/856adf54ab50fc3be66d17a0b94ba3074453b279">856adf54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:40:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Clarify meaning of -haddock flag
Fixes #18206.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ae57afd7abee9dec1050d9feace254ac04800bc">7ae57afd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-23T13:41:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">git: Add ignored commits file
This can be used to tell git to ignore bulk renaming commits like the
recently-finished module hierarchy refactoring. Configured with,
git config blame.ignoreRevsFile .git-ignore-revs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63d30e60b9ab76ed48fa9539957e7b29a2a8c611">63d30e60</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add hie-bios script for windows systems
It is a direct translation of the sh script
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59182b88aaa72d346b480b6aa14a9244915e1189">59182b88</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Honour previous values for CABAL and CABFLAGS
The immediate goal is let the hie-bios.bat script
set CABFLAGS with `-v0` and remove all cabal output
except the compiler arguments
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/932dc54e13a8e2f60ea90af98682cc1011b9533e">932dc54e</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add specific configuration for windows in hie.yaml
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0eda0707d6cc3d5a85cfb13543df61623e82070">e0eda070</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-24T01:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove not needed hie-bios output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0ea59d641d400543e9e803007500da01eedf48a">a0ea59d6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Config module into GHC.Settings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37430251c3f684c46e893552dba78653d80e5243">37430251</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.Core.Arity into GHC.Core.Opt.Arity
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a426abb9b41de6097e888b9fdca7b275306b17c9">a426abb9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.Hs.Types into GHC.Hs.Type
See discussion in https://gitlab.haskell.org/ghc/ghc/issues/13009#note_268610
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c91a7a095331d8c776f6ecd74803026e0104502">1c91a7a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T01:55:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66bd24d197251b9907cbffba3d5d8a3f5e3c2e80">66bd24d1</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-24T01:56:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add orderingTyCon to wiredInTyCons (#18185)
`Ordering` needs to be wired in for use in the built-in `CmpNat` and
`CmpSymbol` type families, but somehow it was never added to the list
of `wiredInTyCons`, leading to the various oddities observed
in #18185. Easily fixed by moving `orderingTyCon` from
`basicKnownKeyNames` to `wiredInTyCons`.
Fixes #18185.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c43634d443bd3cc0b95b43a7180e12230b845d">01c43634</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-05-24T01:56:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused hs-boot file
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a07aa718110071ee30eebadf0b4b372e8e7fc8e">7a07aa71</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix cross-compiler build (#16051)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ccca16e2ecdde0a4e646c6d7515e00a7f364d3">15ccca16</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix distDir per stage
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b420fb2474650e6dfbd66afd199f28492f900f75">b420fb24</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-24T15:22:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix hp2ps error during cross-compilation
Fixed by @alp (see https://gitlab.haskell.org/ghc/ghc/issues/16051#note_274265)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd339ef0e8ce940902df79ed1d93b3af50ea6f77">cd339ef0</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-05-24T15:22:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Unicode brackets opening/closing tokens (#18225)
The tokens `[|`, `|]`, `(|`, and `|)` are opening/closing tokens as
described in GHC Proposal #229. This commit makes the unicode
variants (`⟦`, `⟧`, `⦇`, and `⦈`) act the same as their ASCII
counterparts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53b5cb9a617a22564de909ffd6da6fb328e1581c">53b5cb9a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-25T18:55:18+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FloatOut: Only eta-expand dead-end RHS if arity will increase (#18231)
Otherwise we risk turning trivial RHS into non-trivial RHS, introducing
unnecessary bindings in the next Simplifier run, resulting in more
churn.
Fixes #18231.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ec8ea61215e66e5513a284b9395ad5e2c639d98">7ec8ea61</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-25T18:55:24+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: Recognise precise exceptions from case alternatives (#18086)
Consider
```hs
m :: IO ()
m = do
putStrLn "foo"
error "bar"
```
`m` (from #18086) always throws a (precise or imprecise) exception or
diverges. Yet demand analysis infers `<L,A>` as demand signature instead
of `<L,A>x` for it.
That's because the demand analyser sees `putStrLn` occuring in a case
scrutinee and decides that it has to `deferAfterPreciseException`,
because `putStrLn` throws a precise exception on some control flow
paths. This will mask the `botDiv` `Divergence`of the single case alt
containing `error` to `topDiv`. Since `putStrLn` has `topDiv` itself,
the final `Divergence` is `topDiv`.
This is easily fixed: `deferAfterPreciseException` works by `lub`ing
with the demand type of a virtual case branch denoting the precise
exceptional control flow. We used `nopDmdType` before, but we can be
more precise and use `exnDmdType`, which is `nopDmdType` with `exnDiv`.
Now the `Divergence` from the case alt will degrade `botDiv` to `exnDiv`
instead of `topDiv`, which combines with the result from the scrutinee
to `exnDiv`, and all is well.
Fixes #18086.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#70f0e3f682e0543f692942cb7bafd17134d6b88b">
<span class="new-file">
+
.git-ignore-revs
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</a>
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<li class="file-stats">
<a href="#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77">
compiler/GHC/Builtin/Names.hs
</a>
</li>
<li class="file-stats">
<a href="#57f535740df5928fb0193abc3b28ca771369d8fd">
<span class="deleted-file">
−
compiler/GHC/Builtin/Names.hs-boot
</span>
</a>
</li>
<li class="file-stats">
<a href="#377cfd14c1f92357465df995ec6537b074051322">
compiler/GHC/Builtin/Types.hs
</a>
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<li class="file-stats">
<a href="#10b61652f9817945bb54ccf8fc40f8a664ca3c30">
compiler/GHC/CmmToAsm.hs
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<a href="#b131e0d591301ee7a1c76bbd812f3d14783e934f">
compiler/GHC/CmmToAsm/Dwarf.hs
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<li class="file-stats">
<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Arity.hs
→
compiler/GHC/Core/Opt/Arity.hs
</a>
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<a href="#8e28acdbf4d8c043c7e5d55af312d10b2d8f16de">
compiler/GHC/Core/Opt/CallArity.hs
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compiler/GHC/Core/Opt/ConstantFold.hs
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compiler/GHC/Core/Opt/DmdAnal.hs
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compiler/GHC/Core/Opt/FloatOut.hs
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compiler/GHC/Core/Opt/OccurAnal.hs
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compiler/GHC/Core/Opt/SetLevels.hs
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compiler/GHC/Core/Opt/Simplify.hs
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compiler/GHC/Core/Opt/Simplify/Utils.hs
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compiler/GHC/Core/Opt/Specialise.hs
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compiler/GHC/Core/Opt/WorkWrap.hs
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compiler/GHC/Core/Rules.hs
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compiler/GHC/Core/SimpleOpt.hs
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compiler/GHC/Core/Unfold.hs
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compiler/GHC/Core/Utils.hs
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compiler/GHC/CoreToStg.hs
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compiler/GHC/CoreToStg/Prep.hs
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compiler/GHC/Data/FastString.hs
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compiler/GHC/Driver/Session.hs
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compiler/GHC/Hs.hs
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compiler/GHC/Hs/Binds.hs
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compiler/GHC/Hs/Decls.hs
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compiler/GHC/Hs/Expr.hs
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