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<h3>
Peter Trommler pushed to branch wip/cross-ppr-floats
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/868e452340ade3155dd7e552c16bbb3c21c42b8a">868e4523</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "AArch32 symbols only on aarch32."
This reverts commit cdfeb3f24f76e8fd30452016676e56fbc827789a.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c915ba84f4ec8c4f0f006bd6aa938d17936dcd93">c915ba84</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Fix (1)"
This reverts commit 7abffced01f5680efafe44f6be2733eab321b039.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/777c452a83ebdb2b50f3f328255a6f36ae49f398">777c452a</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "better if guards."
This reverts commit 3f60b94de1f460ca3f689152860b108a19ce193e.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dd405529f0f17cd9a5b299e7ae5539a885b4b5a">0dd40552</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "[linker/rtsSymbols] More linker symbols"
This reverts commit 686e72253aed3880268dd6858eadd8c320f09e97.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30caeee75193ea961c55ee847a3156e23116e84e">30caeee7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-21T06:39:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: remove use of sdocWithDynFlags from GHC.Stg.* (#17957)
* add StgPprOpts datatype
* remove Outputable instances for types that need `StgPprOpts` to be
pretty-printed and explicitly call type specific ppr functions
* add default `panicStgPprOpts` for panic messages (when it's not
convenient to thread StgPprOpts or DynFlags down to the ppr function
call)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/863c544c9849e49872acac64b8faea56a3311564">863c544c</a></strong>
<div>
<span>by Mark</span>
<i>at 2020-07-21T06:39:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a typo in existential_quantification.rst</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05910be1ac5c1f485132d2c8bd1ceb4f86e06db5">05910be1</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-21T14:47:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add release notes entry for #17816
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a625719284db7c69fa3d122e829291a16960e85f">a6257192</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-07-21T14:47:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a newtype `Code` for the return type of typed quotations (Proposal #195)
There are three problems with the current API:
1. It is hard to properly write instances for ``Quote m => m (TExp a)`` as the type is the composition
of two type constructors. Doing so in your program involves making your own newtype and
doing a lot of wrapping/unwrapping.
For example, if I want to create a language which I can either run immediately or
generate code from I could write the following with the new API. ::
class Lang r where
_int :: Int -> r Int
_if :: r Bool -> r a -> r a -> r a
instance Lang Identity where
_int = Identity
_if (Identity b) (Identity t) (Identity f) = Identity (if b then t else f)
instance Quote m => Lang (Code m) where
_int = liftTyped
_if cb ct cf = [|| if $$cb then $$ct else $$cf ||]
2. When doing code generation it is common to want to store code fragments in
a map. When doing typed code generation, these code fragments contain a
type index so it is desirable to store them in one of the parameterised
map data types such as ``DMap`` from ``dependent-map`` or ``MapF`` from
``parameterized-utils``.
::
compiler :: Env -> AST a -> Code Q a
data AST a where ...
data Ident a = ...
type Env = MapF Ident (Code Q)
newtype Code m a = Code (m (TExp a))
In this example, the ``MapF`` maps an ``Ident String`` directly to a ``Code Q String``.
Using one of these map types currently requires creating your own newtype and constantly
wrapping every quotation and unwrapping it when using a splice. Achievable, but
it creates even more syntactic noise than normal metaprogramming.
3. ``m (TExp a)`` is ugly to read and write, understanding ``Code m a`` is
easier. This is a weak reason but one everyone
can surely agree with.
Updates text submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58235d46bd4e9fbf69bd82969b29cd9c6ab051e1">58235d46</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-21T14:47:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix :rts-flag:`--copying-gc` documentation
It was missing a newline.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19e80b9af252eee760dc047765a9930ef00067ec">19e80b9a</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-21T14:50:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accumulate Haddock comments in P (#17544, #17561, #8944)
Haddock comments are, first and foremost, comments. It's very annoying
to incorporate them into the grammar. We can take advantage of an
important property: adding a Haddock comment does not change the parse
tree in any way other than wrapping some nodes in HsDocTy and the like
(and if it does, that's a bug).
This patch implements the following:
* Accumulate Haddock comments with their locations in the P monad.
This is handled in the lexer.
* After parsing, do a pass over the AST to associate Haddock comments
with AST nodes using location info.
* Report the leftover comments to the user as a warning (-Winvalid-haddock).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c719460611e7af44a67041c1707cb206d724d58">4c719460</a></strong>
<div>
<span>by David Binder</span>
<i>at 2020-07-22T20:17:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix dead link to haskell prime discussion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2f817e4c547657c25bb110199f6f0b6014f843b">f2f817e4</a></strong>
<div>
<span>by BinderDavid</span>
<i>at 2020-07-22T20:17:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace broken links to old haskell-prime site by working links to gitlab instance.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bf8980ec86cab8d605149bbf47ed2361e2d389e">0bf8980e</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove length field from FastString
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1010c33bb8704fa55a82bc2601d5cae2e6ecc21f">1010c33b</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use ShortByteString for FastString
There are multiple reasons we want this:
- Fewer allocations: ByteString has 3 fields, ShortByteString just has one.
- ByteString memory is pinned:
- This can cause fragmentation issues (see for example #13110) but also
- makes using FastStrings in compact regions impossible.
Metric Decrease:
T5837
T12150
T12234
T12425
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8336ba78e00ec42521ba8314bc65ec766e6bcc7d">8336ba78</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass specialised utf8DecodeChar# to utf8DecodeLazy# for performance
Currently we're passing a indexWord8OffAddr# type function to
utf8DecodeLazy# which then passes it on to utf8DecodeChar#. By passing one
of utf8DecodeCharAddr# or utf8DecodeCharByteArray# instead we benefit from
the inlining and specialization already done for those.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7484a9a47ad277bb7e51c6357817f7e7c59e744a">7484a9a4</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Encoding: Add comment about tricky ForeignPtr lifetime
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5536ed28b676106810e65bac15305ad2b1b0babd">5536ed28</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use IO constructor instead of `stToIO . ST`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b8902e3975b8275b027b3d1cfe0d8cb8fdd3d13">5b8902e3</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Encoding: Remove redundant use of withForeignPtr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5976a1614e3da7d77f624103bb67f602738e93b8">5976a161</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Encoding: Reformat utf8EncodeShortByteString to be more consistent
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ddf161492194edb321b87b1977eda8264df35aa">9ddf1614</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-07-22T20:18:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FastString: Reintroduce character count cache
Metric Increase:
ManyConstructors
Metric Decrease:
T4029
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9491668640227a7ae7f6d0506d36af3a10cdd49">e9491668</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-22T20:18:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">get-win32-tarballs: Fix detection of missing tarballs
This fixes the error message given by configure when the user
attempts to configure without first download the win32 tarballs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f3ff8fd24b94c9d4a221e6aba3e21de42b0f02c">9f3ff8fd</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-22T20:19:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable BangPatterns, ScopedTypeVariables for ghc and hadrian by default.
This is only for their respective codebases.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f17b930c164f3130caf2215484a8f5f8aa3cc63">0f17b930</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused "ncg" flag
This flag has been removed in 066b369de2c6f7da03c88206288dca29ab061b31
in 2011.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bab4ec8f62352a6361a5fd2cbdc5f12eca8928e7">bab4ec8f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't panic if the NCG isn't built (it is always built)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ea33edb2beb64cde7d51777787e232d4cd4fef1">8ea33edb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused sGhcWithNativeCodeGen
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e079bb721e25dbc19e1adf8c8051b6ea03752962">e079bb72</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correctly test active backend
Previously we used a platform settings to detect if the native code
generator was used. This was wrong. We need to use the
`DynFlags.hscTarget` field instead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/735f9d6bac316a0c1c68a8b49bba465f07b01cdd">735f9d6b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace ghcWithNativeCodeGen with a proper Backend datatype
* Represent backends with a `Backend` datatype in GHC.Driver.Backend
* Don't detect the default backend to use for the target platform at
compile time in Hadrian/make but at runtime. It makes "Settings"
simpler and it is a step toward making GHC multi-target.
* The latter change also fixes hadrian which has not been updated to
take into account that the NCG now supports AIX and PPC64 (cf
df26b95559fd467abc0a3a4151127c95cb5011b9 and
d3c1dda60d0ec07fc7f593bfd83ec9457dfa7984)
* Also we don't treat iOS specifically anymore (cf
cb4878ffd18a3c70f98bdbb413cd3c4d1f054e1f)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7cc431341e5b5b31758eecc8504cae8b2390c10">f7cc4313</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replace HscTarget with Backend
They both have the same role and Backend name is more explicit.
Metric Decrease:
T3064
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ce1804d2b87ac7bd55632957a4cb897decbbee">15ce1804</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-22T20:20:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deprecate -fdmd-tx-dict-sel.
It's behaviour is now unconditionally enabled as
it's slightly beneficial.
There are almost no benchmarks which benefit from
disabling it, so it's not worth the keep this
configurable.
This fixes #18429.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ff1b7710c9975a3cc1025cb5b9d29197a5f1a98a">ff1b7710</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:21:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #18064
It has been fixed by 0effc57d48ace6b719a9f4cbeac67c95ad55010b
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cfa89149b55837f822ba619b797781813fdcdabc">cfa89149</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-22T20:21:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define type Void# = (# #) (#18441)
There's one backwards compatibility issue: GHC.Prim no longer exports
Void#, we now manually re-export it from GHC.Exts.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02f40b0da2eadbf8a0e2930b95d4cef686acd92f">02f40b0d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-07-22T20:22:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #18478
!3392 backported !2993 to GHC 8.10.2 which most probably is responsible
for fixing #18478, which triggered a pattern match checker performance
regression in GHC 8.10.1 as first observed in #17977.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f44df1ec6df2b02be83e41cec4dc3b5f7f540f0">7f44df1e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-22T20:23:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor refactoring of Unit display
* for consistency, try to always use UnitPprInfo to display units to
users
* remove some uses of `unitPackageIdString` as it doesn't show the
component name and it uses String
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dff1cb3d9c111808fec60190747272b973547c52">dff1cb3d</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-23T07:55:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[linker] Fix out of range relocations.
mmap may return address all over the place. mmap_next will ensure we get
the next free page after the requested address.
This is especially important for linking on aarch64, where the memory model with PIC
admits relocations in the +-4GB range, and as such we can't work with
arbitrary object locations in memory.
Of note: we map the rts into process space, so any mapped objects must
not be ouside of the 4GB from the processes address space.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdd0ff16f20ce920c74f9128a1067cbe1bd378c2">cdd0ff16</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-24T18:12:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: restore console cp on exit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1f4f81d3a439cd1a8128e4ab11c7caac7cc0ad8">c1f4f81d</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-24T18:13:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: change memory allocation strategy and fix double free errors.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ba205046e4f2ea94b1c978c050b917de4daaf092">ba205046</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-24T18:13:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Care with occCheckExpand in kind of occurrences
Issue #18451 showed that we could get an infinite type, through
over-use of occCheckExpand in the kind of an /occurrence/ of a
type variable.
See Note [Occurrence checking: look inside kinds] in GHC.Core.Type
This patch fixes the problem by making occCheckExpand less eager
to expand synonyms in kinds.
It also improves pretty printing of kinds, by *not* suppressing
the kind on a tyvar-binder like
(a :: Const Type b)
where type Const p q = p. Even though the kind of 'a' is Type,
we don't want to suppress the kind ascription. Example: the
error message for polykinds/T18451{a,b}. See GHC.Core.TyCo.Ppr
Note [Suppressing * kinds].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02133353e712e98bfbbc6ed32305b137bb3654eb">02133353</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-07-25T00:44:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify XRec definition
Change `Located X` usage to `XRec pass X`
This increases the scope of the LPat experiment to almost all of GHC.
Introduce UnXRec and MapXRec classes
Fixes #17587 and #18408
Updates haddock submodule
Co-authored-by: Philipp Krüger <philipp.krueger1@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e443846ba05c943877e193a9518d5817e15560f3">e443846b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: store printer in TraceBinIfaceReading
We don't need to pass the whole DynFlags, just pass the logging
function, if any.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15b2b44fe35292dc3ac93ec215c44fba42165f67">15b2b44f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename GHC.Driver.Ways into GHC.Platform.Ways
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/342a01af624840ba94f22256079ff4f3cee09ca2">342a01af</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add GHC.Platform.Profile
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6333d7391068d8029eed3e8eff019b9e2c104c7b">6333d739</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Put PlatformConstants into Platform
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9dfeca6c2019fdb46613a68ccd6e650e40c7baac">9dfeca6c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove platform constant wrappers
Platform constant wrappers took a DynFlags parameter, hence implicitly
used the target platform constants. We removed them to allow support
for several platforms at once (#14335) and to avoid having to pass
the full DynFlags to every function (#17957).
Metric Decrease:
T4801
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73145d57f961c73b5853da7881d6a21e48e05909">73145d57</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code in utils/derivConstants
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7721b923d53fb9eb93f80bb93b4c3bd976c05b4c">7721b923</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move GHC.Platform into the compiler
Previously it was in ghc-boot so that ghc-pkg could use it. However it
wasn't necessary because ghc-pkg only uses a subset of it: reading
target arch and OS from the settings file. This is now done via
GHC.Platform.ArchOS (was called PlatformMini before).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/459afeb592d5ff6d338184f5ef248758ecda57a4">459afeb5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix build systems
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e2930c3e18235fda2b8b468cb0fefbe7d65f879">9e2930c3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump CountParserDeps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e2db34bdfead7ad309d8fd01d4423554650cf4c">6e2db34b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-25T00:45:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add accessors to ArchOS
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc0f6fbcd95f2dc69a8efabbee2d8a485c34cc47">fc0f6fbc</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-25T00:45:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Require SMP support in order to build a threaded stage1
Fixes 18266
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7c4439a407ad85b76aab9301fda61e7c10183ff">a7c4439a</a></strong>
<div>
<span>by Matthias Andreas Benkard</span>
<i>at 2020-07-26T13:23:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document loadFramework changes. (#18446)
Adds commentary on the rationale for the changes made in merge request
!3689.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da7269a4472856ba701d956a247599f721e9915e">da7269a4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-26T13:23:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/win32: Exit with EXIT_HEAPOVERFLOW if memory commit fails
Since switching to the two-step allocator, the `outofmem` test fails via
`osCommitMemory` failing to commit. However, this was previously exiting
with `EXIT_FAILURE`, rather than `EXIT_HEAPOVERFLOW`. I think the latter
is a more reasonable exit code for this case and matches the behavior on
POSIX platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f153a1d0a3351ad4d94cef4cef8e63bab5b47008">f153a1d0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-26T13:23:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update win32 output for parseTree
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e91672f0b7185bbafbe8ed1f2ae2cb775111f950">e91672f0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-26T13:23:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Normalise WinIO error message differences
Previously the old Windows IO manager threw different errors than WinIO.
We now canonicalise these to the WinIO errors.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9cbfe0868418a531da0872b0c477a15aa67f8861">9cbfe086</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-26T13:23:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Kill ssh-agent after pushing test metrics
Otherwise the Windows builds hang forever waiting for the process to
terminate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8236925fc8cc2e6e3fed61a0676fa65270a4a538">8236925f</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-26T13:24:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: remove dead argument to stg_newIOPortzh
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce0a1d678fbc8efa5fd384fd0227b7b3dc97cadd">ce0a1d67</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-26T13:25:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix detection of tty terminals
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/52685cf7c077c51e3719e3c4dd5ca8257a99c4ea">52685cf7</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-07-26T13:25:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: update codeowners
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aee45d9ea8c6cf4ebad4d5c732748923c7865cbe">aee45d9e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-27T07:06:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve NegativeLiterals (#18022, GHC Proposal #344)
Before this patch, NegativeLiterals used to parse x-1 as x (-1).
This may not be what the user expects, and now it is fixed:
x-1 is parsed as (-) x 1.
We achieve this by the following requirement:
* When lexing a negative literal,
it must not be preceded by a 'closing token'.
This also applies to unboxed literals, e.g. -1#.
See GHC Proposal #229 for the definition of a closing token.
A nice consequence of this change is that -XNegativeLiterals becomes a
subset of -XLexicalNegation. In other words, enabling both of those
extensions has the same effect as enabling -XLexicalNegation alone.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/667ab69e5edacb2ce2f42fb810cd54c8f856d30b">667ab69e</a></strong>
<div>
<span>by leiftw</span>
<i>at 2020-07-27T07:07:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix typo referring to non-existent `-ohidir` flag, should be `-hidir` I think</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ff89c173f39813f74d7bbf95770c5e40039f155">6ff89c17</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-07-27T07:08:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the parser a little
* Create a dedicated production for type operators
* Create a dedicated type for the UNPACK pragma
* Remove an outdated part of Note [Parsing data constructors is hard]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa054d32a8ff69c334293a0d6c9d11b83a236a96">aa054d32</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:09:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Drop 32-bit Windows support
As noted in #18487, we have reached the end of this road.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6da73bbf97cca8bd64d70a26298e7f7ddad2ce52">6da73bbf</a></strong>
<div>
<span>by Michalis Pardalos</span>
<i>at 2020-07-27T20:09:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add minimal test for #12492
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/47680cb76b068508fd16d052e0a3bed12e38ea5f">47680cb7</a></strong>
<div>
<span>by Michalis Pardalos</span>
<i>at 2020-07-27T20:09:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use allocate, not ALLOC_PRIM_P for unpackClosure#
ALLOC_PRIM_P fails for large closures, by directly using allocate
we can handle closures which are larger than the block size.
Fixes #12492
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d345c9680ab3d766ef43dd8389ccc1eaeca066c">3d345c96</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-27T20:10:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Eta-expand the Simplifier monad
This patch eta-expands the Simplifier's monad, using the method
explained in GHC.Core.Unify Note [The one-shot state monad trick].
It's part of the exta-expansion programme in #18202.
It's a tiny patch, but is worth a 1-2% reduction in bytes-allocated
by the compiler. Here's the list, based on the compiler-performance
tests in perf/compiler:
Reduction in bytes allocated
T10858(normal) -0.7%
T12425(optasm) -1.3%
T13056(optasm) -1.8%
T14683(normal) -1.1%
T15164(normal) -1.3%
T15630(normal) -1.4%
T17516(normal) -2.3%
T18282(normal) -1.6%
T18304(normal) -0.8%
T1969(normal) -0.6%
T4801(normal) -0.8%
T5321FD(normal) -0.7%
T5321Fun(normal) -0.5%
T5642(normal) -0.9%
T6048(optasm) -1.1%
T9020(optasm) -2.7%
T9233(normal) -0.7%
T9675(optasm) -0.5%
T9961(normal) -2.9%
WWRec(normal) -1.2%
Metric Decrease:
T12425
T9020
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57aca6bba1c000f8542ce94e8b724b0334ff96d4">57aca6bb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:10:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Ensure that Hadrian jobs don't download artifacts
Previously the Hadrian jobs had the default dependencies, meaning that
they would download artifacts from all jobs of earlier stages. This is
unneccessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a815cea9fa11ce6ef22aec3525dd7a0df541daf">0a815cea</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-27T20:10:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump bootstrap compiler to 8.8.4
Hopefully this will make the Windows jobs a bit more reliable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bd60059b0edfee9e8f66c6817257bbb946656cd">0bd60059</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-28T02:01:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">This patch addresses the exponential blow-up in the simplifier.
Specifically:
#13253 exponential inlining
#10421 ditto
#18140 strict constructors
#18282 another nested-function call case
This patch makes one really significant changes: change the way that
mkDupableCont handles StrictArg. The details are explained in
GHC.Core.Opt.Simplify Note [Duplicating StrictArg].
Specific changes
* In mkDupableCont, when making auxiliary bindings for the other arguments
of a call, add extra plumbing so that we don't forget the demand on them.
Otherwise we haev to wait for another round of strictness analysis. But
actually all the info is to hand. This change affects:
- Make the strictness list in ArgInfo be [Demand] instead of [Bool],
and rename it to ai_dmds.
- Add as_dmd to ValArg
- Simplify.makeTrivial takes a Demand
- mkDupableContWithDmds takes a [Demand]
There are a number of other small changes
1. For Ids that are used at most once in each branch of a case, make
the occurrence analyser record the total number of syntactic
occurrences. Previously we recorded just OneBranch or
MultipleBranches.
I thought this was going to be useful, but I ended up barely
using it; see Note [Note [Suppress exponential blowup] in
GHC.Core.Opt.Simplify.Utils
Actual changes:
* See the occ_n_br field of OneOcc.
* postInlineUnconditionally
2. I found a small perf buglet in SetLevels; see the new
function GHC.Core.Opt.SetLevels.hasFreeJoin
3. Remove the sc_cci field of StrictArg. I found I could get
its information from the sc_fun field instead. Less to get
wrong!
4. In ArgInfo, arrange that ai_dmds and ai_discs have a simpler
invariant: they line up with the value arguments beyond ai_args
This allowed a bit of nice refactoring; see isStrictArgInfo,
lazyArgcontext, strictArgContext
There is virtually no difference in nofib. (The runtime numbers
are bogus -- I tried a few manually.)
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
fft +0.0% -2.0% -48.3% -49.4% 0.0%
multiplier +0.0% -2.2% -50.3% -50.9% 0.0%
--------------------------------------------------------------------------------
Min -0.4% -2.2% -59.2% -60.4% 0.0%
Max +0.0% +0.1% +3.3% +4.9% 0.0%
Geometric Mean +0.0% -0.0% -33.2% -34.3% -0.0%
Test T18282 is an existing example of these deeply-nested strict calls.
We get a big decrease in compile time (-85%) because so much less
inlining takes place.
Metric Decrease:
T18282
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ee07b494ddd0131d53ea2fd6a4bb29cd05f4dd8">6ee07b49</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-28T02:02:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add support for negative shifts (fix #18499)
shiftR/shiftL support negative arguments despite Haskell 2010 report
saying otherwise. We explicitly test for negative values which is bad
(it gets in the way of constant folding, etc.). Anyway, for consistency
we fix Bits instancesof Integer/Natural.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f305bbfd0d7afee8fe7464252fbfc167205220ae">f305bbfd</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-07-28T02:03:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">config: Fix Haskell platform constructor w/ params
Fixes #18505
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/318bb17c9d3fbbe68eff706c38eb8e653cea3d83">318bb17c</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-07-28T20:54:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in haddock
Spotted by `vilpan` on `#haskell`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39c89862161bf488a6aca9372cbb67690f436ce7">39c89862</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-07-28T20:54:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc/mk: don't build gmp packages for BIGNUM_BACKEND=native
Before this change make-based `BIGNUM_BACKEND=native` build was failing as:
```
x86_64-pc-linux-gnu-gcc: error: libraries/ghc-bignum/gmp/objs/*.o: No such file or directory
```
This happens because ghc.mk was pulling in gmp-dependent
ghc-bignum library unconditionally. The change avoid building
ghc-bignum.
Bug: https://gitlab.haskell.org/ghc/ghc/-/issues/18437
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9a880fce484d0a87bb794b9d2d8a73e54819011">b9a880fc</a></strong>
<div>
<span>by Felix Wiemuth</span>
<i>at 2020-07-29T15:06:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c59064b0c60d3d779f5fd067be4b6648d8de23cf">c59064b0</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #16341
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a61411cab31fcc08f1dcd629b85c736e2b5b6bc7">a61411ca</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass dit_rep_tc_args to dsm_stock_gen_fn
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a26498daa4d87a15b3e829c204ed6e9b4323f684">a26498da</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass tc_args to gen_fn
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44b11bad052eabf43246acba6aab814376b08713">44b11bad</a></strong>
<div>
<span>by Brandon Chinn</span>
<i>at 2020-07-29T15:07:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Filter out unreachable constructors when deriving stock instances (#16431)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bbc5191640761ca9773abc898c077363b7beb4e7">bbc51916</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-29T15:07:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Kill off sc_mult and as_mult fields
They are readily derivable from other fields, so this is more
efficient, and less error prone.
Fixes #18494
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3db4b4c5b7f5d2a62ebd88e174fca07d04c4e18">e3db4b4c</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-07-29T15:08:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix build system on ARM
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96c31ea1f0303ebabc59edccff2e88444fe02722">96c31ea1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-29T15:09:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix bug in Natural multiplication (fix #18509)
A bug was lingering in Natural multiplication (inverting two limbs)
despite QuickCheck tests used during the development leading to wrong
results (independently of the selected backend).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e1dc3d7b89ea79aea158ee487234d3730e857f04">e1dc3d7b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-29T15:09:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix validation errors (#18510)
Test T2632 is a stage1 test that failed because of the Q => Quote change.
The remaining tests did not use quotation and failed when the path
contained a space.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c68a84254d70280e2dc73485f361787a3503850">6c68a842</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-07-30T07:11:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">For `-fkeep-going` do not duplicate dependency edge code
We now compute the deps for `-fkeep-going` the same way that the
original graph calculates them, so the edges are correct. Upsweep really
ought to take the graph rather than a topological sort so we are never
recalculating anything, but at least things are recaluclated
consistently now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/502de55676a38572db60848c13392f5f115e1c8a">502de556</a></strong>
<div>
<span>by cgibbard</span>
<i>at 2020-07-30T07:11:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add haddock comment for unfilteredEdges
and move the note about drop_hs_boot_nodes into it.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01c948eba4bea2d2c8ad340e12c1e7b732b334f7">01c948eb</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-30T07:11:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up the inferred type variable restriction
This patch primarily:
* Documents `checkInferredVars` (previously called
`check_inferred_vars`) more carefully. This is the
function which throws an error message if a user quantifies an
inferred type variable in a place where specificity cannot be
observed. See `Note [Unobservably inferred type variables]` in
`GHC.Rename.HsType`.
Note that I now invoke `checkInferredVars` _alongside_
`rnHsSigType`, `rnHsWcSigType`, etc. rather than doing so _inside_
of these functions. This results in slightly more call sites for
`checkInferredVars`, but it makes it much easier to enumerate the
spots where the inferred type variable restriction comes into
effect.
* Removes the inferred type variable restriction for default method
type signatures, per the discussion in #18432. As a result, this
patch fixes #18432.
Along the way, I performed some various cleanup:
* I moved `no_nested_foralls_contexts_err` into `GHC.Rename.Utils`
(under the new name `noNestedForallsContextsErr`), since it now
needs to be invoked from multiple modules. I also added a helper
function `addNoNestedForallsContextsErr` that throws the error
message after producing it, as this is a common idiom.
* In order to ensure that users cannot sneak inferred type variables
into `SPECIALISE instance` pragmas by way of nested `forall`s, I
now invoke `addNoNestedForallsContextsErr` when renaming
`SPECIALISE instance` pragmas, much like when we rename normal
instance declarations. (This probably should have originally been
done as a part of the fix for #18240, but this task was somehow
overlooked.) As a result, this patch fixes #18455 as a side effect.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d47324ce49b0c4f419823cbd7fd47e134a1b255a">d47324ce</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-30T07:12:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't mark closed type family equations as occurrences
Previously, `rnFamInstEqn` would mark the name of the type/data
family used in an equation as an occurrence, regardless of what sort
of family it is. Most of the time, this is the correct thing to do.
The exception is closed type families, whose equations constitute its
definition and therefore should not be marked as occurrences.
Overzealously counting the equations of a closed type family as
occurrences can cause certain warnings to not be emitted, as observed
in #18470. See `Note [Type family equations and occurrences]` in
`GHC.Rename.Module` for the full story.
This fixes #18470 with a little bit of extra-casing in
`rnFamInstEqn`. To accomplish this, I added an extra
`ClosedTyFamInfo` field to the `NonAssocTyFamEqn` constructor of
`AssocTyFamInfo` and refactored the relevant call sites accordingly
so that this information is propagated to `rnFamInstEqn`.
While I was in town, I moved `wrongTyFamName`, which checks that the
name of a closed type family matches the name in an equation for that
family, from the renamer to the typechecker to avoid the need for an
`ASSERT`. As an added bonus, this lets us simplify the details of
`ClosedTyFamInfo` a bit.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebe2cf4538fa46994ef67663ac8fd5e579579803">ebe2cf45</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-30T07:12:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove an incorrect WARN in extendLocalRdrEnv
I noticed this warning going off, and discovered that it's
really fine. This small patch removes the warning, and docments
what is going on.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f71f69714255165d0fdc2790a588487ff9439dc">9f71f697</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-30T07:13:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two bangs to improve perf of flattening
This tiny patch improves the compile time of flatten-heavy
programs by 1-2%, by adding two bangs.
Addresses (somewhat) #18502
This reduces allocation by
T9872b -1.1%
T9872d -3.3%
T5321Fun -0.2%
T5631 -0.2%
T5837 +0.1%
T6048 +0.1%
Metric Decrease:
T9872b
T9872d
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c274cd530cc42a26028050b75d56b3437e06ec1">7c274cd5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:54:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix minimal imports dump for boot files (fix #18497)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/175cb5b4044e6f4ad2224f54115f42e7a8b08f9b">175cb5b4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:55:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't use sdocWithDynFlags in datacon ppr
We don't need to use `sdocWithDynFlags` to know whether we should
display linear types for datacon types, we already have
`sdocLinearTypes` field in `SDocContext`. Moreover we want to remove
`sdocWithDynFlags` (#10143, #17957)).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/380638a33691ba43fdcd2e18bca636750e5f66f1">380638a3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-30T22:56:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: fix powMod for gmp backend (#18515)
Also reenable integerPowMod test which had never been reenabled by
mistake.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/56a7c19337c5b2aa21d521a6d7c965174ec8379b">56a7c193</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-31T19:32:09+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CLabel pretty-printing
Pretty-printing CLabel relies on sdocWithDynFlags that we want to remove
(#10143, #17957). It uses it to query the backend and the platform.
This patch exposes Clabel ppr functions specialised for each backend so
that backend code can directly use them.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b15dc3cfb1a33e3d4d952af62d4d0b841a731f5">3b15dc3c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-31T19:32:09+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: don't use sdocWithDynFlags in GHC.CmmToAsm.Dwarf.Types
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e30fed6c6de1f881ce313900274294a793e42677">e30fed6c</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-01T04:23:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Test case for #17652
The issue was fixed by 19e80b9af252eee760dc047765a9930ef00067ec
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/226417424b2b578fd3c5424588367cb24e7720eb">22641742</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-02T16:44:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove ConDeclGADTPrefixPs
This removes the `ConDeclGADTPrefixPs` per the discussion in #18517.
Most of this patch simply removes code, although the code in the
`rnConDecl` case for `ConDeclGADTPrefixPs` had to be moved around a
bit:
* The nested `forall`s check now lives in the `rnConDecl` case for
`ConDeclGADT`.
* The `LinearTypes`-specific code that used to live in the
`rnConDecl` case for `ConDeclGADTPrefixPs` now lives in
`GHC.Parser.PostProcess.mkGadtDecl`, which is now monadic so that
it can check if `-XLinearTypes` is enabled.
Fixes #18157.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2d1accf67cb6e1dab6b2c78fef4b64526c31a4a">f2d1accf</a></strong>
<div>
<span>by Leon Schoorl</span>
<i>at 2020-08-02T16:44:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GHC_STAGE definition generated by make
Fixes #18070
GHC_STAGE is the stage of the compiler we're building, it should be 1,2(,3?).
But make was generating 0 and 1.
Hadrian does this correctly using a similar `+ 1`:
https://gitlab.haskell.org/ghc/ghc/-/blob/eb8115a8c4cbc842b66798480fefc7ab64d31931/hadrian/src/Rules/Generate.hs#L245
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/947206f478d4eef641dfc58cb4c13471a23260c3">947206f4</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-08-03T07:52:33+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix running stage0/bin/ghc with wrong package DB. Fixes #17468.
In the invocation of `cabal configure`, `--ghc-pkg-option=--global-package-db`
was already given correctly to tell `stage0/bin/ghc-pkg` that it should use
the package DB in `stage1/`.
However, `ghc` needs to be given this information as well, not only `ghc-pkg`!
Until now that was not the case; the package DB in `stage0` was given to
`ghc` instead.
This was wrong, because there is no binary compatibility guarantee that says
that the `stage0` DB's `package.cache` (which is written by the
stage0 == system-provided ghc-pkg) can be deserialised by the `ghc-pkg`
from the source code tree.
As a result, when trying to add fields to `InstalledPackageInfo` that get
serialised into / deserialised from the `package.cache`, errors like
_build/stage0/lib/package.conf.d/package.cache: GHC.PackageDb.readPackageDb: inappropriate type (Not a valid Unicode code point!)
would appear. This was because the `stage0/bin/ghc would try to
deserialise the newly added fields from
`_build/stage0/lib/package.conf.d/package.cache`, but they were not in there
because the system `ghc-pkg` doesn't know about them and thus didn't write them
there.
It would try to do that because any GHC by default tries to read the global
package db in `../lib/package.conf.d/package.cache`.
For `stage0/bin/ghc` that *can never work* as explained above, so we
must disable this default via `-no-global-package-db` and give it the
correct package DB explicitly.
This is the same problem as #16534, and the same fix as in MR !780
(but in another context; that one was for developers trying out the
`stage0/bin/ghc` == `_build/ghc-stage1` interactively, while this fix
is for a `cabal configure` invocation).
I also noticed that the fix for #16534 forgot to pass `-no-global-package-db`,
and have fixed that in this commit as well.
It only worked until now because nobody tried to add a new ghc-pkg `.conf`
field since the introduction of Hadrian.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef2ae81a394df573510b12b7e11bba0c931249d8">ef2ae81a</a></strong>
<div>
<span>by Alex Biehl</span>
<i>at 2020-08-03T07:52:33+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hardcode RTS includes to cope with unregistered builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d613ed7624cbf39192d2a8cf29ab0c0fd2980a15">d613ed76</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-05T03:59:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add backward compat integer-gmp functions
Also enhance bigNatCheck# and isValidNatural test
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f2f771869c65125ba013a5dd2b213061efe0fc2">3f2f7718</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-05T03:59:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add more BigNat compat functions in integer-gmp
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e12cd1733b581f48a5873b12971b6974778eabb">5e12cd17</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-05T04:00:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename Core.Opt.Driver -> Core.Opt.Pipeline
Closes #18504.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bff2f87e43985e02bdde8c6fa39279df86cb617">2bff2f87</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-05T04:00:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "iserv: Don't pass --export-dynamic on FreeBSD"
This reverts commit 2290eb02cf95e9cfffcb15fc9c593d5ef79c75d9.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53ce0db5a06598c88c6b8cb32043b878e7083dd4">53ce0db5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-05T04:00:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor handling of object merging
Previously to merge a set of object files we would invoke the linker as
usual, adding -r to the command-line. However, this can result in
non-sensical command-lines which causes lld to balk (#17962).
To avoid this we introduce a new tool setting into GHC, -pgmlm, which is
the linker which we use to merge object files.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb7013c3037538aa9c947a21dbbfd7c297929ac8">eb7013c3</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-08-05T04:01:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove all the unnecessary LANGUAGE pragmas
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fbcb886d503dd7aaebc4c40e59615068b3fd0bd7">fbcb886d</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-05T04:01:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make CodeQ and TExpQ levity polymorphic
The patch is quite straightforward. The only tricky part is that
`Language.Haskell.TH.Lib.Internal` now must be `Trustworthy` instead
of `Safe` due to the `GHC.Exts` import (in order to import `TYPE`).
Since `CodeQ` has yet to appear in any released version of
`template-haskell`, I didn't bother mentioning the change to `CodeQ`
in the `template-haskell` release notes.
Fixes #18521.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/686e06c59c3aa6b66895e8a501c7afb019b09e36">686e06c5</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Grammar for types and data/newtype constructors
Before this patch, we parsed types into a reversed sequence
of operators and operands. For example, (F x y + G a b * X)
would be parsed as [X, *, b, a, G, +, y, x, F],
using a simple grammar:
tyapps
: tyapp
| tyapps tyapp
tyapp
: atype
| PREFIX_AT atype
| tyop
| unpackedness
Then we used a hand-written state machine to assemble this
either into a type, using 'mergeOps',
or into a constructor, using 'mergeDataCon'.
This is due to a syntactic ambiguity:
data T1 a = MkT1 a
data T2 a = Ord a => MkT2 a
In T1, what follows after the = sign is a data/newtype constructor
declaration. However, in T2, what follows is a type (of kind
Constraint). We don't know which of the two we are parsing until we
encounter =>, and we cannot check for => without unlimited lookahead.
This poses a few issues when it comes to e.g. infix operators:
data I1 = Int :+ Bool :+ Char -- bad
data I2 = Int :+ Bool :+ Char => MkI2 -- fine
By this issue alone we are forced into parsing into an intermediate
representation and doing a separate validation pass.
However, should that intermediate representation be as low-level as a
flat sequence of operators and operands?
Before GHC Proposal #229, the answer was Yes, due to some particularly
nasty corner cases:
data T = ! A :+ ! B -- used to be fine, hard to parse
data T = ! A :+ ! B => MkT -- bad
However, now the answer is No, as this corner case is gone:
data T = ! A :+ ! B -- bad
data T = ! A :+ ! B => MkT -- bad
This means we can write a proper grammar for types, overloading it in
the DisambECP style, see Note [Ambiguous syntactic categories].
With this patch, we introduce a new class, DisambTD. Just like
DisambECP is used to disambiguate between expressions, commands, and patterns,
DisambTD is used to disambiguate between types and data/newtype constructors.
This way, we get a proper, declarative grammar for constructors and
types:
infixtype
: ftype
| ftype tyop infixtype
| unpackedness infixtype
ftype
: atype
| tyop
| ftype tyarg
| ftype PREFIX_AT tyarg
tyarg
: atype
| unpackedness atype
And having a grammar for types means we are a step closer to using a
single grammar for types and expressions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6770e199645b0753d2edfddc68c199861a1be980">6770e199</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up the story around runPV/runECP_P/runECP_PV
This patch started as a small documentation change, an attempt to make
Note [Parser-Validator] and Note [Ambiguous syntactic categories]
more clear and up-to-date.
But it turned out that runECP_P/runECP_PV are weakly motivated,
and it's easier to remove them than to find a good rationale/explanation
for their existence.
As the result, there's a bit of refactoring in addition to
a documentation update.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/826d07db0e0f31fe2b2d2e0661be7f0cb3cde3c7">826d07db</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix debug_ppr_ty ForAllTy (#18522)
Before this change, GHC would
pretty-print forall k. forall a -> ()
as forall @k a. ()
which isn't even valid Haskell.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ddb43848b9fc24f5404915f57dc504546e68292">0ddb4384</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix visible forall in ppr_ty (#18522)
Before this patch, this type:
T :: forall k -> (k ~ k) => forall j -> k -> j -> Type
was printed incorrectly as:
T :: forall k j -> (k ~ k) => k -> j -> Type
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2a432258fa00e22ca386ef30d0a77ff5b277db8">d2a43225</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-08-06T13:34:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fail eagerly on a lev-poly datacon arg
Close #18534.
See commentary in the patch.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/63348155404c64334fa864454132630f9d2a4d7f">63348155</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-06T13:34:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a type alias for Ways
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9570c21295a2b4a1d1e40939869124f0b9b9bf91">9570c212</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-06T19:46:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Rename 8.12 to 9.0
GHC 8.12.1 has been renamed to GHC 9.0.1.
See also:
https://mail.haskell.org/pipermail/ghc-devs/2020-July/019083.html
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3907ee01e68b383fa30386d163decf203acedb19">3907ee01</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-08-07T08:34:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A fix to an error message in monad comprehensions, and a move of dsHandleMonadicFailure
as suggested by comments on !2330.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa9bb70a3fefef681cb0e80cc78977386c1dcf0a">fa9bb70a</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-08-07T08:34:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add some tests for fail messages in do-expressions and monad-comprehensions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5f03606319f745b10e9918c76a47426b293f0bf9">5f036063</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">cmm: Clean up Notes a bit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6402c1240d5bd768b8fe8b4368413932bedbe107">6402c124</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmLint: Check foreign call argument register invariant
As mentioned in Note [Register parameter passing] the arguments of
foreign calls cannot refer to caller-saved registers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15b36de030ecdd60897bc7a6a02bdeabd0825be4">15b36de0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</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/3847ae0ccf67bddf73304a39f5320c3ba285aa48">3847ae0c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18527
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd51d53be42114c105b5ab15fcbdb387526b1c17">dd51d53b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T08:35:21-04:00</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>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e4f1b73ad9f292a6bbeb21fee44b0ba1a7f3c33b">e4f1b73a</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-08-07T23:58:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ApiAnnotations; tweaks for ghc-exactprint update
Remove unused ApiAnns, add one for linear arrow.
Include API Annotations for trailing comma in export list.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a665db6174eaedbbae925c0ccb4c22b3f29bcaf">8a665db6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-07T23:58:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix double-negation in ld merge-objects check
We want to only run the check if ld is gold.
Fixes the fix to #17962.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a11c9678409b2e0a01e8aba153e094800f3641bf">a11c9678</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-08-09T11:32:25+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: depend on boot compiler version #18001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c8873b52f6a16202c3cb839e988c1406b8f67cfe">c8873b52</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-08-09T21:17:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Api Annotations : Adjust SrcSpans for prefix bang (!).
And prefix ~
(cherry picked from commit 8dbee2c578b1f642d45561be3f416119863e01eb)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/77398b678aba45ba25932a39b7e8a7a31d0dd6f3">77398b67</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-09T21:18:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid allocations in `splitAtList` (#18535)
As suspected by @simonpj in #18535, avoiding allocations in
`GHC.Utils.Misc.splitAtList` when there are no leftover arguments is
beneficial for performance:
On CI validate-x86_64-linux-deb9-hadrian:
T12227 -7%
T12545 -12.3%
T5030 -10%
T9872a -2%
T9872b -2.1%
T9872c -2.5%
Metric Decrease:
T12227
T12545
T5030
T9872a
T9872b
T9872c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ba41a0f7f5a8eeb39b73d0f0041a53549c377ab">8ba41a0f</a></strong>
<div>
<span>by Felix Yan</span>
<i>at 2020-08-10T20:23:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correct a typo in ghc.mk</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c4692641dcaca3e90116c28d012c506108b386f">1c469264</a></strong>
<div>
<span>by Felix Yan</span>
<i>at 2020-08-10T20:23:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a closing parenthesis too
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acf537f9fefa31883b7cb28ff61b837ab7f8a44a">acf537f9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-10T20:24:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make splitAtList strict in its arguments
Also fix its slightly wrong comment
Metric Decrease:
T5030
T12227
T12545
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab4d15898c03a5db6741feb2028488facf032fa4">ab4d1589</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-11T22:18:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">typecheck: Drop SPECIALISE pragmas when there is no unfolding
Previously the desugarer would instead fall over when it realized that
there was no unfolding for an imported function with a SPECIALISE
pragma. We now rather drop the SPECIALISE pragma and throw a warning.
Fixes #18118.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ac8c0a551619b52e0f151d6781b11dd66cf2110">0ac8c0a5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-11T22:18:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18118
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c43078d7b78b4722dd30b56674c27189d2689ffe">c43078d7</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2020-08-11T22:18:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add hie.yaml to ghc-heap
This enables IDE support by haskell-language-server for ghc-heap.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1088b3f31ceddf918a319c97557fb1f08a9a387">f1088b3f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-11T22:19:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Specify metrics collected by T17516
Previously it collected everything, including "max bytes used". This is
problematic since the test makes no attempt to control for deviations in
GC timing, resulting in high variability. Fix this by only collecting
"bytes allocated".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/accbc242e555822a2060091af7188ce6e9b0144e">accbc242</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-12T03:50:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: disentangle Outputable
- put panic related functions into GHC.Utils.Panic
- put trace related functions using DynFlags in GHC.Driver.Ppr
One step closer making Outputable fully independent of DynFlags.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db6dd810eb7986a39657f7f028f1f4de92b321dd">db6dd810</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-12T03:50:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Increase tolerance of T16916
T16916 (testing #16916) has been slightly fragile in CI due to its
reliance on CPU times. While it's hard to see how to eliminate
the time-dependence entirely, we can nevertheless make it more tolerant.
Fixes #16966.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bee43aca827387aa81a64801d82adcb596d01d9a">bee43aca</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-12T20:52:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rewrite and move the monad-state hack note
The note has been rewritten by @simonpj in !3851
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25fdf25eb574d6d291673603ab36ac5ec7e37066">25fdf25e</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-08-12T20:53:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ApiAnnotations: Fix parser for new GHC 9.0 features
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7831fe05021caa90d4696ca91ae2b31a82e65b3d">7831fe05</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-13T03:44:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">parser: Suggest ImportQualifiedPost in prepositive import warning
As suggested in #18545.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55dec4dc6e8f8430810d212c73e78ffbb92e0a48">55dec4dc</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-08-13T03:44:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Better long-distance info for where bindings (#18533)
Where bindings can see evidence from the pattern match of the `GRHSs`
they belong to, but not from anything in any of the guards (which belong
to one of possibly many RHSs).
Before this patch, we did *not* consider said evidence, causing #18533,
where the lack of considering type information from a case pattern match
leads to failure to resolve the vanilla COMPLETE set of a data type.
Making available that information required a medium amount of
refactoring so that `checkMatches` can return a
`[(Deltas, NonEmpty Deltas)]`; one `(Deltas, NonEmpty Deltas)` for each
`GRHSs` of the match group. The first component of the pair is the
covered set of the pattern, the second component is one covered set per
RHS.
Fixes #18533.
Regression test case: T18533
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf97889a38edc3314a7b61e6e0b6e6d0f434c8a2">cf97889a</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-08-13T03:45:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-add BangPatterns to CodePage.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffc0d578ea22de02a68c64c094602701e65d8895">ffc0d578</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-13T09:49:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add HomeUnit type
Since Backpack the "home unit" is much more involved than what it was
before (just an identifier obtained with `-this-unit-id`). Now it is
used in conjunction with `-component-id` and `-instantiated-with` to
configure module instantiations and to detect if we are type-checking an
indefinite unit or compiling a definite one.
This patch introduces a new HomeUnit datatype which is much easier to
understand. Moreover to make GHC support several packages in the same
instances, we will need to handle several HomeUnits so having a
dedicated (documented) type is helpful.
Finally in #14335 we will also need to handle the case where we have no
HomeUnit at all because we are only loading existing interfaces for
plugins which live in a different space compared to units used to
produce target code. Several functions will have to be refactored to
accept "Maybe HomeUnit" parameters instead of implicitly querying the
HomeUnit fields in DynFlags. Having a dedicated type will make this
easier.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a51b2ab7433c06bddca9699b0dfd8ab1d11879b">8a51b2ab</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-13T21:09:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make IOEnv monad one-shot (#18202)
On CI (x86_64-linux-deb9-hadrian, compile_time/bytes_allocated):
T10421 -1.8% (threshold: +/- 1%)
T10421a -1.7% (threshold: +/- 1%)
T12150 -4.9% (threshold: +/- 2%)
T12227 -1.6 (threshold: +/- 1%)
T12425 -1.5% (threshold: +/- 1%)
T12545 -3.8% (threshold: +/- 1%)
T12707 -3.0% (threshold: +/- 1%)
T13035 -3.0% (threshold: +/- 1%)
T14683 -10.3% (threshold: +/- 2%)
T3064 -6.9% (threshold: +/- 2%)
T4801 -4.3% (threshold: +/- 2%)
T5030 -2.6% (threshold: +/- 2%)
T5321FD -3.6% (threshold: +/- 2%)
T5321Fun -4.6% (threshold: +/- 2%)
T5631 -19.7% (threshold: +/- 2%)
T5642 -13.0% (threshold: +/- 2%)
T783 -2.7 (threshold: +/- 2%)
T9020 -11.1 (threshold: +/- 2%)
T9961 -3.4% (threshold: +/- 2%)
T1969 (compile_time/bytes_allocated) -2.2% (threshold: +/-1%)
T1969 (compile_time/max_bytes_used) +24.4% (threshold: +/-20%)
Additionally on other CIs:
haddock.Cabal -10.0% (threshold: +/- 5%)
haddock.compiler -9.5% (threshold: +/- 5%)
haddock.base (max bytes used) +24.6% (threshold: +/- 15%)
T10370 (max bytes used, i386) +18.4% (threshold: +/- 15%)
Metric Decrease:
T10421
T10421a
T12150
T12227
T12425
T12545
T12707
T13035
T14683
T3064
T4801
T5030
T5321FD
T5321Fun
T5631
T5642
T783
T9020
T9961
haddock.Cabal
haddock.compiler
Metric Decrease 'compile_time/bytes allocated':
T1969
Metric Increase 'compile_time/max_bytes_used':
T1969
T10370
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f66fdf69b7bcdacbfc46e636668ad0fe509b1b6">9f66fdf6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-14T15:50:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Drop --io-manager flag from testsuite configuration
This is no longer necessary as there are now dedicated testsuite ways
which run tests with WinIO.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55fd1dc55990623dcf3b2e6143e766242315d757">55fd1dc5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-14T15:51:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvm-targets: Add i686 targets
Addresses #18422.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a938802b22922ab3bc66218b73a25775a8734fb9">a938802b</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-08-15T05:55:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC and X86: Portable printing of IEEE floats
GNU as and the AIX assembler support floating point literals.
SPARC seems to have support too but I cannot test on SPARC.
Curiously, `doubleToBytes` is also used in the LLVM backend.
To avoid endianness issues when cross-compiling float and double literals
are printed as C-style floating point values. The assembler then takes
care of memory layout and endianness.
This was brought up in #18431 by @hsyl20.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
</a>
</li>
<li class="file-stats">
<a href="#f656107cc03a27946448887125380c358788500e">
.gitlab/test-metrics.sh
</a>
</li>
<li class="file-stats">
<a href="#abe895765c4ce08c5dfbc95e5e3c5db67ff92ded">
CODEOWNERS
</a>
</li>
<li class="file-stats">
<a href="#9ab3868b23ed5d5a6e12ef902049902556fa4009">
aclocal.m4
</a>
</li>
<li class="file-stats">
<a href="#d0d96a6d03668aeab20ebe05e2c4ccb798c7e64c">
compiler/GHC.hs
</a>
</li>
<li class="file-stats">
<a href="#0887cf39c5cdf9cf8d6758f410d7dab3023c0d77">
compiler/GHC/Builtin/Names.hs
</a>
</li>
<li class="file-stats">
<a href="#06764eb0158306b83ab1998d18316392a51838c2">
compiler/GHC/Builtin/Names/TH.hs
</a>
</li>
<li class="file-stats">
<a href="#377cfd14c1f92357465df995ec6537b074051322">
compiler/GHC/Builtin/Types.hs
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