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<h3>
David Eichmann pushed to branch wip/con-info
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/52114fa0f97805d4c4924bc3abce1a8b0fc7a5c6">52114fa0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-16T11:48:47+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Addr# atomic primops (#17751)
This reuses the codegen used for ByteArray#'s atomic primops.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8150f6546e6fd0006252e245d5697f13ffd8ce3e">8150f654</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-18T23:38:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Print types of uncovered patterns (#18932)
In order to avoid confusion as in #18932, we display the type of the
match variables in the non-exhaustiveness warning, e.g.
```
T18932.hs:14:1: warning: [-Wincomplete-patterns]
Pattern match(es) are non-exhaustive
In an equation for ‘g’:
Patterns of type ‘T a’, ‘T a’, ‘T a’ not matched:
(MkT2 _) (MkT1 _) (MkT1 _)
(MkT2 _) (MkT1 _) (MkT2 _)
(MkT2 _) (MkT2 _) (MkT1 _)
(MkT2 _) (MkT2 _) (MkT2 _)
...
|
14 | g (MkT1 x) (MkT1 _) (MkT1 _) = x
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```
It also allows us to omit the type signature on wildcard matches which
we previously showed in only some situations, particularly
`-XEmptyCase`.
Fixes #18932.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/165352a2d163537afb01a835bccc7cd0a667410a">165352a2</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-11-20T02:08:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export indexError from GHC.Ix (#18579)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b57845c3d80f5bed8f498f27fb7a318f2b2f8b2c">b57845c3</a></strong>
<div>
<span>by Kamil Dworakowski</span>
<i>at 2020-11-20T02:09:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify interruptible FFI wrt masking state
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/321d1bd8a79ab39c3c9e8697fffb0107c43f83cf">321d1bd8</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-20T02:09:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix strictness signatures of `prefetchValue*#` primops
Their strictness signatures said the primops are strict in their first
argument, which is wrong: Handing it a thunk will prefetch the pointer
to the thunk, but not evaluate it. Hence not strict.
The regression test `T8256` actually tests for laziness in the first
argument, so GHC apparently never exploited the strictness signature.
See also https://gitlab.haskell.org/ghc/ghc/-/issues/8256#note_310867,
where this came up.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0aec78b6c97cee58ba20bfcb959f1369b80c4e4c">0aec78b6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-20T02:09:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Demand: Interleave usage and strictness demands (#18903)
As outlined in #18903, interleaving usage and strictness demands not
only means a more compact demand representation, but also allows us to
express demands that we weren't easily able to express before.
Call demands are *relative* in the sense that a call demand `Cn(cd)`
on `g` says "`g` is called `n` times. *Whenever `g` is called*, the
result is used according to `cd`". Example from #18903:
```hs
h :: Int -> Int
h m =
let g :: Int -> (Int,Int)
g 1 = (m, 0)
g n = (2 * n, 2 `div` n)
{-# NOINLINE g #-}
in case m of
1 -> 0
2 -> snd (g m)
_ -> uncurry (+) (g m)
```
Without the interleaved representation, we would just get `L` for the
strictness demand on `g`. Now we are able to express that whenever
`g` is called, its second component is used strictly in denoting `g`
by `1C1(P(1P(U),SP(U)))`. This would allow Nested CPR to unbox the
division, for example.
Fixes #18903.
While fixing regressions, I also discovered and fixed #18957.
Metric Decrease:
T13253-spj
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a55b3a2574f913d046f3a6f82db48d7f6df32e3">3a55b3a2</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-20T02:09:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update user's guide entry on demand analysis and worker/wrapper
The demand signature notation has been undocumented for a long time.
The only source to understand it, apart from reading the `Outputable`
instance, has been an outdated wiki page.
Since the previous commits have reworked the demand lattice, I took
it as an opportunity to also write some documentation about notation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc963932018ccf5445613ec0932d726b51887769">fc963932</a></strong>
<div>
<span>by Greg Steuck</span>
<i>at 2020-11-20T02:10:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Find hadrian location more reliably in cabal-install output
Fix #18944
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f40cf6ca9fb24dbc55f7eae43e2b89aa12bf251">9f40cf6c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-20T02:11:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Align bssSize to page size when mapping symbol extras
We place symbol_extras right after bss. We also need
to ensure that symbol_extras can be mprotect'd independently from the
rest of the image. To ensure this we round up the size of bss to a page
boundary, thus ensuring that symbol_extras is also page-aligned.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b739c319dd56fa2aabd8007cc200eafb3c7651a7">b739c319</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-20T02:11:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add usage message to ci.sh
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/802e9180dd9a9a88c4e8869f0de1048e1edd6343">802e9180</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-20T02:11:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add VERBOSE environment variable
And change the make build system's default behavior to V=0, greatly
reducing build log sizes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a8a979c24fe34a81a438ae179693ddaca12709f">2a8a979c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:13:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: A bit of clean-up in profiling flag documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/56804e33a05729f5a5340d3680ae2849e30a9e86">56804e33</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:13:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Refactor CountParserDeps
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53ad67eacacde8fde452f1a323d5886183375182">53ad67ea</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:13:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce -fprof-callers flag
This introducing a new compiler flag to provide a convenient way to
introduce profiler cost-centers on all occurrences of the named
identifier.
Closes #18566.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ecfd0278cb811c93853c176fe5df60222d1a8fb5">ecfd0278</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-21T01:14:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Plugins into HscEnv (#17957)
Loaded plugins have nothing to do in DynFlags so this patch moves them
into HscEnv (session state).
"DynFlags plugins" become "Driver plugins" to still be able to register
static plugins.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72f2257c792e6178933f12ee3401939da11584b6">72f2257c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-21T01:14:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't initialize plugins in the Core2Core pipeline
Some plugins can be added via TH (cf addCorePlugin). Initialize them in
the driver instead of in the Core2Core pipeline.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ddbeeb3c7dc7a2781801cc0e6539d2b4b0e97a20">ddbeeb3c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-11-21T01:14:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #10504
This issue was fixed at some point between GHC 8.0 and 8.2. Let's add a
regression test to ensure that it stays fixed.
Fixes #10504.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4a6dc2a90e28c34054d0cfd4c6fd962bf4adc2e">a4a6dc2a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:15:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">dwarf: Apply info table offset consistently
Previously we failed to apply the info table offset to the aranges and
DIEs, meaning that we often failed to unwind in gdb. For some reason
this only seemed to manifest in the RTS's Cmm closures. Nevertheless,
now we can unwind completely up to `main`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69bfbc216c2278c9796aa999c7815c19c12b0f2c">69bfbc21</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T01:15:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Disable stripping when debug information is enabled
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e93ae8b2257c17d5ae5ef7832db723e897c8e8b">7e93ae8b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-21T13:13:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Post ticky entry counts to the eventlog
We currently only post the entry counters, not the other global
counters as in my experience the former are more useful. We use the heap
profiler's census period to decide when to dump.
Also spruces up the documentation surrounding ticky-ticky a bit.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc9c3916df96a20c58b91fd383a0da77ec83c4b0">bc9c3916</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-22T06:28:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement -ddump-c-backend argument
To dump output of the C backend.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/901bc2208a115e0f8313b3aa9abc76fd05509aaa">901bc220</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-22T12:39:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump time submodule to 1.11.1
Also bumps directory, Cabal, hpc, time, and unix submodules.
Closes #18847.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92c0afbf592e71dae3c80cec09b1596df50ff8a9">92c0afbf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-22T12:39:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Dump STG when ticky is enabled
This changes the "ticky" modifier to enable dumping of final STG as this
is generally needed to make sense of the ticky profiles.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d23fef68415ce6587f77e9530cb0571bb90b31cc">d23fef68</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-22T12:39:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Introduce notion of flavour transformers
This extends Hadrian's notion of "flavour", as described in #18942.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/179d0becd2ddfa216f7b221df9fc520a352fdbe7">179d0bec</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-22T12:39:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add a viaLlvmBackend modifier
Note that this also slightly changes the semantics of these flavours as
we only use LLVM for >= stage1 builds.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d4d95e51a463e539fceb1c6f191e84adaa337e3b">d4d95e51</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-22T12:39:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add profiled_ghc and no_dynamic_ghc modifiers
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6815603f271484766425ff2e37043b78da2d073c">6815603f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-22T12:39:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Drop redundant flavour definitions
Drop the profiled, LLVM, and ThreadSanitizer flavour definitions as
these can now be realized with flavour transformers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f88f43398217a5f4c2d326555e21fb1417a21db2">f88f4339</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-24T02:43:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Flush eventlog buffers from flushEventLog
As noted in #18043, flushTrace failed flush anything beyond the writer.
This means that a significant amount of data sitting in capability-local
event buffers may never get flushed, despite the users' pleads for us to
flush.
Fix this by making flushEventLog flush all of the event buffers before
flushing the writer.
Fixes #18043.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c03cc5010999d0f0f9dfc549984023b3a1f2c8d">7c03cc50</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-24T02:43:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Run LLVM job on appropriately-labelled MRs
Namely, those marked with the ~"LLVM backend" label
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b95d815d718ce671e9e87b8a2eb0534ed5688dd">9b95d815</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-24T02:43:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Run LLVM builds on Debian 10
The current Debian 9 image doesn't provide LLVM 7.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ed3e6c0f179c06828712832d1176519cdfa82a6">2ed3e6c0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-24T02:43:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmToLlvm: Declare signature for memcmp
Otherwise `opt` fails with:
error: use of undefined value '@memcmp$def'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be5d74caab64abf9d986fc7290f62731db7e73e7">be5d74ca</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-11-26T16:00:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[Sized Cmm] properly retain sizes.
This replaces all Word<N> = W<N># Word# and Int<N> = I<N># Int# with
Word<N> = W<N># Word<N># and Int<N> = I<N># Int<N>#, thus providing us
with properly sized primitives in the codegenerator instead of pretending
they are all full machine words.
This came up when implementing darwinpcs for arm64. The darwinpcs reqires
us to pack function argugments in excess of registers on the stack. While
most procedure call standards (pcs) assume arguments are just passed in
8 byte slots; and thus the caller does not know the exact signature to make
the call, darwinpcs requires us to adhere to the prototype, and thus have
the correct sizes. If we specify CInt in the FFI call, it should correspond
to the C int, and not just be Word sized, when it's only half the size.
This does change the expected output of T16402 but the new result is no
less correct as it eliminates the narrowing (instead of the `and` as was
previously done).
Bumps the array, bytestring, text, and binary submodules.
Co-Authored-By: Ben Gamari <ben@well-typed.com>
Metric Increase:
T13701
T14697
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a84e53f978341135355c5c82cd7af2ae2efa5e72">a84e53f9</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-11-26T16:00:32-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: Fix failed inlining of copy_tag.
On windows using gcc-10 gcc failed to inline copy_tag into evacuate.
To fix this we now set the always_inline attribute for the various
copy* functions in Evac.c. The main motivation here is not the
overhead of the function call, but rather that this allows the code
to "specialize" for the size of the closure we copy which is often
known at compile time.
An earlier commit also tried to avoid evacuate_large inlining. But
didn't quite succeed. So I also marked evacuate_large as noinline.
Fixes #12416
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdbd16f5450998ad27f376e97b11d3e2873b95f9">cdbd16f5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-26T16:00:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix toArgRep to support 64-bit reps on all systems
[This is @Ericson2314 writing a commit message for @hsyl20's patch.]
(Progress towards #11953, #17377, #17375)
`Int64Rep` and `Word64Rep` are currently broken on 64-bit systems. This
is because they should use "native arg rep" but instead use "large arg
rep" as they do on 32-bit systems, which is either a non-concept or a
128-bit rep depending on one's vantage point.
Now, these reps currently aren't used during 64-bit compilation, so the
brokenness isn't observed, but I don't think that constitutes reasons
not to fix it. Firstly, the linked issues there is a clearly expressed
desire to use explicit-bitwidth constructs in more places. Secondly, per
[1], there are other bugs that *do* manifest from not threading
explicit-bitwidth information all the way through the compilation
pipeline. One can therefore view this as one piece of the larger effort
to do that, improve ergnomics, and squash remaining bugs.
Also, this is needed for !3658. I could just merge this as part of that,
but I'm keen on merging fixes "as they are ready" so the fixes that
aren't ready are isolated and easier to debug.
[1]: https://mail.haskell.org/pipermail/ghc-devs/2020-October/019332.html
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9378e690d79ea5fce18aad96c76c8eb34f2ebba">a9378e69</a></strong>
<div>
<span>by Tim Barnes</span>
<i>at 2020-11-26T16:00:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Set dynamic users-guide TOC spacing (fixes #18554)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86a59d930fa6ab0889792c1d67b1d29ba1edec1f">86a59d93</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-26T16:00:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Use RTS_LIKELY in CHECK
Most compilers probably already infer that
`barf` diverges but it nevertheless doesn't
hurt to be explicit.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5757e82b9344a3b012cf6d71c347ad727e57f8a3">5757e82b</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-11-26T16:00:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove special case for GHC.ByteCode.Instr
This was added in
https://github.com/nomeata/ghc-heap-view/commit/34935206e51b9c86902481d84d2f368a6fd93423
GHC.ByteCode.Instr.BreakInfo no longer exists so the special case is dead code.
Any check like this can be easily dealt with in client code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d9c8b5b472b6e7c4bd5a2b7eeda2bef711db9239">d9c8b5b4</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-11-26T16:00:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split Up getClosureDataFromHeapRep
Motivation
1. Don't enforce the repeated decoding of an info table, when the client
can cache it (ghc-debug)
2. Allow the constructor information decoding to be overridden, this
casues segfaults in ghc-debug
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e3555cc9c2a9f5246895f151259fd2a81621f38">3e3555cc</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-11-26T16:00:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RegAlloc: Add missing raPlatformfield to RegAllocStatsSpill
Fixes #18994
Co-Author: Benjamin Maurer <maurer.benjamin@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a1a75aa9be2c133dd1372a08eeb6a92c31688df7">a1a75aa9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-27T06:20:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Allocate MBlocks with MAP_TOP_DOWN on Windows
As noted in #18991, we would previously allocate heap in low memory.
Due to this the linker, which typically *needs* low memory, would end up
competing with the heap. In longer builds we end up running out of
low memory entirely, leading to linking failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75fc1ed58bb9adb3f472e1529d368c0fff479353">75fc1ed5</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-28T15:40:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix detection of ghc-pkg for cross-compilers
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cb5df9617544dc3bdf85b719feaaa5d15f01c2c">7cb5df96</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-28T15:40:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: fix ghc-pkg uses (#17601)
Make sure ghc-pkg doesn't read the compiler "settings" file by passing
--no-user-package-db.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3fd4226a08ac6cd4abe9f25f764e518de66834a">e3fd4226</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-28T15:40:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Introduce a nightly cross-compilation job
This adds a job to test cross-compilation from x86-64 to AArch64 with
Hadrian.
Fixes #18234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/698d3d9648e9cb6b3757269e21ce4fa1692a1a3b">698d3d96</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-28T15:41:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Only deploy GitLab Pages in ghc/ghc>
The deployments are quite large and yet are currently only served for
the ghc/ghc> project.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/625726f988852f5779825a954609d187d9865dc1">625726f9</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2020-11-28T15:41:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-heap: partial TSO/STACK decoding
Co-authored-by: Sven Tennie <sven.tennie@gmail.com>
Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
Co-authored-by: Ben Gamari <bgamari.foss@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22ea9c296906ad3a8fed384bcf6fb35d4b6ca814">22ea9c29</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-11-28T15:42:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small optimization to CmmSink.
Inside `regsUsedIn` we can avoid some thunks by specializing the
recursion. In particular we avoid the thunk for `(f e z)` in the
MachOp/Load branches, where we know this will evaluate to z.
Reduces allocations for T3294 by ~1%.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bba42c62220a437f52e7d30cbfa67e93b4cab06e">bba42c62</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-11-28T15:42:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make primop handler indentation more consistent
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c82bc8e9d444d6d61198f3bfbcc7c5bb5f6ce13c">c82bc8e9</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-11-28T15:42:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cleanup some primop constructor names
Harmonize the internal (big sum type) names of the native vs fixed-sized
number primops a bit. (Mainly by renaming the former.)
No user-facing names are changed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae14f160c64d20880486ba365348ef3900c84a60">ae14f160</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-28T15:43:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T14702 as fragile on Windows
Due to #18953.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bc104b029b4f043cac42253ee2387f4d574abca">1bc104b0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-29T15:33:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">withTimings: Emit allocations counter
This will allow us to back out the allocations per compiler pass from
the eventlog. Note that we dump the allocation counter rather than the
difference since this will allow us to determine how much work is done
*between* `withTiming` blocks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e992ea84248e2ac9f9d439cd9b25745e8c41e32d">e992ea84</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ThreadPaused: Don't zero slop until free vars are pushed
When threadPaused blackholes a thunk it calls `OVERWRITING_CLOSURE` to
zero the slop for the benefit of the sanity checker. Previously this was
done *before* pushing the thunk's free variables to the update
remembered set. Consequently we would pull zero'd pointers to the update
remembered set.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e82cd140e510a792031247a8f414ade48382703b">e82cd140</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix regression from TSAN work
The TSAN rework (specifically aad1f803) introduced a subtle regression
in GC.c, swapping `g0` in place of `gen`. Whoops!
Fixes #18997.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35a5207e8277800b77af90d74cdd235d29a901e6">35a5207e</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Messages: Add missing write barrier in THROWTO message update
After a THROWTO message has been handle the message closure is
overwritten by a NULL message. We must ensure that the original
closure's pointers continue to be visible to the nonmoving GC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0120829f47ed9ebd02ffd552d71e45cca3bdc9f6">0120829f</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Add missing write barrier in shrinkSmallByteArray
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a4d8fb62abde3b79043e8915ee538aaabe2d97c">8a4d8fb6</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Updates: Don't zero slop until closure has been pushed
Ensure that the the free variables have been pushed to the update
remembered set before we zero the slop.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2793cfdc8f7dca8461149d54882286a76f52ff84">2793cfdc</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">OSThreads: Fix error code checking
pthread_join returns its error code and apparently doesn't set errno.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e391a16f919e5bebf75355e8dd1542cdc5656198">e391a16f</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Don't join to mark_thread on shutdown
The mark thread is not joinable as we detach from it on creation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/60d088aba238c7265adf76840ec1d883373b0e20">60d088ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Add reference to Ueno 2016
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3aa603620ef5a6aae1778278aa9914f344ab526e">3aa60362</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-29T15:33:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Ensure that evacuated large objects are marked
See Note [Non-moving GC: Marking evacuated objects].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d304a99d2d0c17fb49c0589c0525817d515c0d0">8d304a99</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-30T10:15:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/m32: Refactor handling of allocator seeding
Previously, in an attempt to reduce fragmentation, each new allocator
would map a region of M32_MAX_PAGES fresh pages to seed itself. However,
this ends up being extremely wasteful since it turns out that we often
use fewer than this. Consequently, these pages end up getting freed
which, ends up fragmenting our address space more than than we would
have if we had naively allocated pages on-demand.
Here we refactor m32 to avoid this waste while achieving the
fragmentation mitigation previously desired. In particular, we move all
page allocation into the global m32_alloc_page, which will pull a page
from the free page pool. If the free page pool is empty we then refill
it by allocating a region of M32_MAP_PAGES and adding them to the pool.
Furthermore, we do away with the initial seeding entirely. That is, the
allocator starts with no active pages: pages are rather allocated on an
as-needed basis.
On the whole this ends up being a pleasingly simple change,
simultaneously making m32 more efficient, more robust, and simpler.
Fixes #18980.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b66292890d5fe0791c291f4fc427f1ab1d0f5c15">b6629289</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-30T10:15:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Use CHECK instead of assert
Use the GHC wrappers instead of <assert.h>.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f4efa6a5e5d43c81d7e61b27f7cd6e3f812b1ea">9f4efa6a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-30T10:15:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Replace some ASSERTs with CHECK
In the past some people have confused ASSERT, which is for checking
internal invariants, which CHECK, which should be used when checking
things that might fail due to bad input (and therefore should be enabled
even in the release compiler). Change some of these cases in the linker
to use CHECK.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f8a4655e39bed1ca39820abdd3df9db5706b036">0f8a4655</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-11-30T10:16:34-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow deploy:pages job to fail
See #18973.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49ebe369165c85ae4c2382b40e34bfa4f1e9da25">49ebe369</a></strong>
<div>
<span>by chessai</span>
<i>at 2020-11-30T19:47:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimisations in Data.Foldable (T17867)
This PR concerns the following functions from `Data.Foldable`:
* minimum
* maximum
* sum
* product
* minimumBy
* maximumBy
- Default implementations of these functions now use `foldl'` or `foldMap'`.
- All have been marked with INLINEABLE to make room for further optimisations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d79ef6599f44b5ab33cbd89fec96ebfac0794a1">4d79ef65</a></strong>
<div>
<span>by chessai</span>
<i>at 2020-11-30T19:47:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/Data/Foldable.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6af074cecdee533791943af1191541f82abc34c4">6af074ce</a></strong>
<div>
<span>by chessai</span>
<i>at 2020-11-30T19:47:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/Data/Foldable.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab334262a605b0ebc228096d8af88a55aa5ea6b8">ab334262</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2020-11-30T19:48:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">dirty MVAR after mutating TSO queue head
While the original head and tail of the TSO queue may be in the same
generation as the MVAR, interior elements of the queue could be younger
after a GC run and may then be exposed by putMVar operation that updates
the queue head.
Resolves #18919
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5eb163f321fdc9a3dbb5e02a157b7f8194e70fcc">5eb163f3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-30T19:48:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Don't allow shared libraries to be loaded multiple times
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/490aa14dbc98e4713f913c4417d454e53b8b278a">490aa14d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-30T19:48:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Initialise CCSs from native shared objects
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ac3db5fefbac6bea6c8fd0ac64daf036d9a8e60">6ac3db5f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-30T19:48:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Move shared library loading logic into Elf.c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b6698d73fa9811795ca37ba0b704aa430c390345">b6698d73</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-11-30T19:48:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Don't declare dynamic objects with image_mapped
This previously resulted in warnings due to spurious unmap failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b94a65afe1e270245cd5b9fe03d59b726dfba8c4">b94a65af</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-11-30T19:49:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Include tried paths in findToolDir error
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72a87fbc7a95c012be260d1a14374e2b06ed0a36">72a87fbc</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-12-01T19:57:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move core flattening algorithm to Core.Unify
This sets the stage for a later change, where this
algorithm will be needed from GHC.Core.InstEnv.
This commit also splits GHC.Core.Map into
GHC.Core.Map.Type and GHC.Core.Map.Expr,
in order to avoid module import cycles
with GHC.Core.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dd45d0adbade7eaae973b09b4d0ff1acb1479b8">0dd45d0a</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-12-01T19:57:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump the # of commits searched for perf baseline
The previous value of 75 meant that a feature branch with
more than 75 commits would get spurious CI passes.
This affects #18692, but does not fix that ticket, because
if a baseline cannot be found, we should fail, not succeed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bb52d9186655134e3e06b4dc003e060379f5417">8bb52d91</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-12-01T19:57:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove flattening variables
This patch redesigns the flattener to simplify type family applications
directly instead of using flattening meta-variables and skolems. The key new
innovation is the CanEqLHS type and the new CEqCan constraint (Ct). A CanEqLHS
is either a type variable or exactly-saturated type family application; either
can now be rewritten using a CEqCan constraint in the inert set.
Because the flattener no longer reduces all type family applications to
variables, there was some performance degradation if a lengthy type family
application is now flattened over and over (not making progress). To
compensate, this patch contains some extra optimizations in the flattener,
leading to a number of performance improvements.
Close #18875.
Close #18910.
There are many extra parts of the compiler that had to be affected in writing
this patch:
* The family-application cache (formerly the flat-cache) sometimes stores
coercions built from Given inerts. When these inerts get kicked out, we must
kick out from the cache as well. (This was, I believe, true previously, but
somehow never caused trouble.) Kicking out from the cache requires adding a
filterTM function to TrieMap.
* This patch obviates the need to distinguish "blocking" coercion holes from
non-blocking ones (which, previously, arose from CFunEqCans). There is thus
some simplification around coercion holes.
* Extra commentary throughout parts of the code I read through, to preserve
the knowledge I gained while working.
* A change in the pure unifier around unifying skolems with other types.
Unifying a skolem now leads to SurelyApart, not MaybeApart, as documented
in Note [Binding when looking up instances] in GHC.Core.InstEnv.
* Some more use of MCoercion where appropriate.
* Previously, class-instance lookup automatically noticed that e.g. C Int was
a "unifier" to a target [W] C (F Bool), because the F Bool was flattened to
a variable. Now, a little more care must be taken around checking for
unifying instances.
* Previously, tcSplitTyConApp_maybe would split (Eq a => a). This is silly,
because (=>) is not a tycon in Haskell. Fixed now, but there are some
knock-on changes in e.g. TrieMap code and in the canonicaliser.
* New function anyFreeVarsOf{Type,Co} to check whether a free variable
satisfies a certain predicate.
* Type synonyms now remember whether or not they are "forgetful"; a forgetful
synonym drops at least one argument. This is useful when flattening; see
flattenView.
* The pattern-match completeness checker invokes the solver. This invocation
might need to look through newtypes when checking representational equality.
Thus, the desugarer needs to keep track of the in-scope variables to know
what newtype constructors are in scope. I bet this bug was around before but
never noticed.
* Extra-constraints wildcards are no longer simplified before printing.
See Note [Do not simplify ConstraintHoles] in GHC.Tc.Solver.
* Whether or not there are Given equalities has become slightly subtler.
See the new HasGivenEqs datatype.
* Note [Type variable cycles in Givens] in GHC.Tc.Solver.Canonical
explains a significant new wrinkle in the new approach.
* See Note [What might match later?] in GHC.Tc.Solver.Interact, which
explains the fix to #18910.
* The inert_count field of InertCans wasn't actually used, so I removed
it.
Though I (Richard) did the implementation, Simon PJ was very involved
in design and review.
This updates the Haddock submodule to avoid #18932 by adding
a type signature.
-------------------------
Metric Decrease:
T12227
T5030
T9872a
T9872b
T9872c
Metric Increase:
T9872d
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d66660ba4c491f9937a1a959b009d90f08a4fbee">d66660ba</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-12-01T19:57:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename the flattener to become the rewriter.
Now that flattening doesn't produce flattening variables,
it's not really flattening anything: it's rewriting. This
change also means that the rewriter can no longer be confused
the core flattener (in GHC.Core.Unify), which is sometimes used
during type-checking.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/add0aeaefd4d823d31315564e924ce8c018fb69e">add0aeae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-01T19:58:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Introduce mmapAnonForLinker
Previously most of the uses of mmapForLinker were mapping anonymous
memory, resulting in a great deal of unnecessary repetition. Factor this
out into a new helper.
Also fixes a few places where error checking was missing or suboptimal.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97d71646ddf3814de62573100ed0b224d1588cbc">97d71646</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-01T19:58:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Introduce munmapForLinker
Consolidates munmap calls to ensure consistent error handling.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8872af08d205c3067371d56200e68cf2f0c1ffc">d8872af0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-01T19:58:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Linker: Introduce Windows implementations for mmapForLinker, et al.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c35d0e03514ce111ff8265426a7b911456984f50">c35d0e03</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-01T19:58:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/m32: Introduce NEEDS_M32 macro
Instead of relying on RTS_LINKER_USE_MMAP
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41c64eb5db50c80e110e47b7ab1c1ee18dada46b">41c64eb5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-01T19:58:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker: Use m32 to allocate symbol extras in PEi386
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0b08c5f445f70381c854f78913489685feb224e">e0b08c5f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-03T13:01:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix copy-paste error
Also be more consistent in quoting.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33ec3a0600fe8c009ab8ed6d86941a8fd88fb033">33ec3a06</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-03T23:11:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Run linters through ci.sh
Ensuring that the right toolchain is used.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a437bc19d2026845948356a932b2cac2417eb12">4a437bc1</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2020-12-05T09:06:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix bad span calculations of post qualified imports
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8fac4b9333ef3607e75b4520d847054316cb8c2d">8fac4b93</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-05T09:07:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add a test for #18923
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62ed6957463a9c0f711ea698d7ed4371e00fb122">62ed6957</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-12-08T15:31:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix kind inference for data types. Again.
This patch fixes several aspects of kind inference for data type
declarations, especially data /instance/ declarations
Specifically
1. In kcConDecls/kcConDecl make it clear that the tc_res_kind argument
is only used in the H98 case; and in that case there is no result
kind signature; and hence no need for the disgusting splitPiTys in
kcConDecls (now thankfully gone).
The GADT case is a bit different to before, and much nicer.
This is what fixes #18891.
See Note [kcConDecls: kind-checking data type decls]
2. Do not look at the constructor decls of a data/newtype instance
in tcDataFamInstanceHeader. See GHC.Tc.TyCl.Instance
Note [Kind inference for data family instances]. This was a
new realisation that arose when doing (1)
This causes a few knock-on effects in the tests suite, because
we require more information than before in the instance /header/.
New user-manual material about this in "Kind inference in data type
declarations" and "Kind inference for data/newtype instance
declarations".
3. Minor improvement in kcTyClDecl, combining GADT and H98 cases
4. Fix #14111 and #8707 by allowing the header of a data instance
to affect kind inferece for the the data constructor signatures;
as described at length in Note [GADT return types] in GHC.Tc.TyCl
This led to a modest refactoring of the arguments (and argument
order) of tcConDecl/tcConDecls.
5. Fix #19000 by inverting the sense of the test in new_locs
in GHC.Tc.Solver.Canonical.canDecomposableTyConAppOK.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0abe3ddf85a915ab99ae4f87a85faf6ee5466ad3">0abe3ddf</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-12-08T15:32:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: build the _l and _thr_l rts flavours in the develN flavours
The ghc binary requires the eventlog rts since
fc644b1a643128041cfec25db84e417851e28bab
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/51e3bb6db85c20cb6b287fa5ec7cfe679a7e5259">51e3bb6d</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-12-08T22:43:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CodeGen: Make folds User/DefinerOfRegs INLINEABLE.
Reduces allocation for the test case I was looking at by about 1.2%.
Mostly from avoiding allocation of some folding functions which turn
into let-no-escape bindings which just reuse their environment instead.
We also force inlining in a few key places in CmmSink which helps a bit
more.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69ae10c39bfed1c4f90f34b42aa0630e0fda2b1b">69ae10c3</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-12-08T22:43:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmSink: Force inlining of foldRegsDefd
Helps avoid allocating the folding function. Improves
perf for T3294 by about 1%.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e3da80055dd7b3fc3bdc576088fdd16129bdac7">6e3da800</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-12-08T22:43:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cmm: Make a few types and utility function slightly stricter.
About 0.6% reduction in allocations for the code I was looking at.
Not a huge difference but no need to throw away performance.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aef44d7fbef92159960daf73c53dbc3c8d21ecbf">aef44d7f</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-12-08T22:43:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cmm.Sink: Optimize retaining of assignments, live sets.
Sinking requires us to track live local regs after each
cmm statement. We used to do this via "Set LocalReg".
However we can replace this with a solution based on IntSet
which is overall more efficient without losing much. The thing
we lose is width of the variables, which isn't used by the sinking
pass anyway.
I also reworked how we keep assignments to regs mentioned in
skipped assignments. I put the details into
Note [Keeping assignemnts mentioned in skipped RHSs].
The gist of it is instead of keeping track of it via the use count
which is a `IntMap Int` we now use the live regs set (IntSet) which
is quite a bit faster.
I think it also matches the semantics a lot better. The skipped
(not discarded) assignment does in fact keep the regs on it's rhs
alive so keeping track of this in the live set seems like the clearer
solution as well.
Improves allocations for T3294 by yet another 1%.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59f2249b4f4f3b1a5f2d0bc1b2923e0652b7de8f">59f2249b</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-12-08T22:43:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Cmm.Opt: Be stricter in results.
Optimization either returns Nothing if nothing is to be done or
`Just <cmmExpr>` otherwise. There is no point in being lazy in
`cmmExpr`. We usually inspect this element so the thunk gets forced
not long after.
We might eliminate it as dead code once in a blue moon but that's
not a case worth optimizing for.
Overall the impact of this is rather low. As Cmm.Opt doesn't allocate
much (compared to the rest of GHC) to begin with.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54b88eacbf9d13f2b1d070932a742ec74419c3f5">54b88eac</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-12-08T22:43:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump time submodule.
This should fix #19002.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35e7b0c6581bb7b577e63b08770bb8f1372435aa">35e7b0c6</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-12-10T01:45:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc: Clarify the default for -fomit-yields
“Yield points enabled” is confusing (and probably wrong?
I am not 100% sure what it means). Change it to a simple “on”.
Undo this change from 2c23fff2e03e77187dc4d01f325f5f43a0e7cad2.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3551c554acd8d692de7948c47a27327988b3a308">3551c554</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-12-10T01:45:54-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc: Extra-clarify -fomit-yields
Be more clear on what this optimisation being on by default means
in terms of yields.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6484f0d72a9110c5960b9185f239e6ce049b0c74">6484f0d7</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-12-10T01:46:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/linker/Elf.c: add missing <dlfcn.h> include (musl support)
The change fixes build failure on musl:
```
rts/linker/Elf.c:2031:3: error:
warning: implicit declaration of function 'dlclose'; did you mean 'close'? [-Wimplicit-function-declaration]
2031 | dlclose(nc->dlopen_handle);
| ^~~~~~~
| close
```
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab24ed9bdb1d1b6967883f47eb432c08477d26a9">ab24ed9b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-11T03:55:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Fix syntax errors
Fixes errors introduced by 3a55b3a2574f913d046f3a6f82db48d7f6df32e3.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3a24d3190de47044981363329337c16b5052028">d3a24d31</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-11T03:55:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Describe GC lifecycle events
Every time I am asked about how to interpret these events I need to
figure it out from scratch. It's well past time that the users guide
properly documents these.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/741309b94e5ef312f4112c86e99b540d412dd100">741309b9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-11T03:56:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix incorrect Docker image for nightly cross job
Also refactor the job definition to eliminate the bug by construction.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19703bc83732525cd8309b1e07815840fcc622fb">19703bc8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-11T03:56:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix name of flavour in ThreadSanitizer job
It looks like I neglected to update this after introduce flavour
transformers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/381eb66012c2b1b9ef50008df57293fe443c2972">381eb660</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T12:57:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Display FFI labels (fix #18539)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4548d1f8a2356458ded83f26a728c31159b46a56">4548d1f8</a></strong>
<div>
<span>by Aaron Allen</span>
<i>at 2020-12-11T12:58:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Elide extraneous messages for :doc command (#15784)
Do not print `<has no documentation>` alongside a valid doc.
Additionally, if two matching symbols lack documentation then the
message will only be printed once. Hence, `<has no documentation>` will
be printed at most once and only if all matching symbols are lacking
docs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5eba91b629745746397ed36f25fe592d08ec667b">5eba91b6</a></strong>
<div>
<span>by Aaron Allen</span>
<i>at 2020-12-11T12:58:14-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add :doc test case for duplicate record fields
Tests that the output of the `:doc` command is correct for duplicate
record fields defined using -XDuplicateRecordFields.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5feb9b2dad0ce609e3cfb537a6ca758a09a6898e">5feb9b2d</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-12-11T22:39:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Delete outdated Note [Kind-checking tyvar binders for associated types]
This Note has severely bitrotted, as it has no references anywhere in the
codebase, and none of the functions that it mentions exist anymore. Let's just
delete this. While I was in town, I deleted some outdated comments from
`checkFamPatBinders` of a similar caliber.
Fixes #19008.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9f9f030d77ee6fb882897246a67b527937b8f66">f9f9f030</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:40:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arrows: correctly query arrow methods (#17423)
Consider the following code:
proc (C x y) -> ...
Before this patch, the evidence binding for the Arrow dictionary was
attached to the C pattern:
proc (C x y) { $dArrow = ... } -> ...
But then when we desugar this, we use arrow operations ("arr", ">>>"...)
specialised for this arrow:
let
arr_xy = arr $dArrow -- <-- Not in scope!
...
in
arr_xy (\(C x y) { $dArrow = ... } -> ...)
This patch allows arrow operations to be type-checked before the proc
itself, avoiding this issue.
Fix #17423
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aaa8f00fa03dbc29511283f93fde3b627023f4fe">aaa8f00f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:40:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Validate script: fix configure command when using stack
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4a929a1e54272ff6ba67c1a2baba635bae93b0b">b4a929a1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:41:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix libffi tarball parsing
Fix parsing of "libffi-3.3.tar.gz".
NB: switch to a newer libffi isn't done in this patch
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/690c894616a539c59cb8e58d2bba8b9c02c5ad4c">690c8946</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:42:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parser: move parser utils into their own module
Move code unrelated to runtime evaluation out of GHC.Runtime.Eval
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/76be0e32d6638c04521b74421a9ce2380593fb54">76be0e32</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:42:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move SizedSeq into ghc-boot
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a16d764f3cf01add8c09b9ca5c071176f857fb8">3a16d764</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:42:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghci: don't compile unneeded modules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2895fa60350e19016ee4babc1a1ce8bc5179364d">2895fa60</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:42:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghci: reuse Arch from ghc-boot
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/480a38d4ad2f6fa2137e81e9f318dda445858e9c">480a38d4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:43:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: don't use siginterrupt (#19019)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4af6126d1758d5e365cadf032e34c99489f13dee">4af6126d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:44:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use static array in zeroCount
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5bd71bfd3a410ff2edcd29306a9824d60857f9fd">5bd71bfd</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-12-12T04:45:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: Annotate top-level function bindings with demands (#18894)
It's useful to annotate a non-exported top-level function like `g` in
```hs
module Lib (h) where
g :: Int -> Int -> (Int,Int)
g m 1 = (m, 0)
g m n = (2 * m, 2 `div` n)
{-# NOINLINE g #-}
h :: Int -> Int
h 1 = 0
h m
| odd m = snd (g m 2)
| otherwise = uncurry (+) (g 2 m)
```
with its demand `UCU(CS(P(1P(U),SP(U))`, which tells us that whenever `g` was
called, the second component of the returned pair was evaluated strictly.
Since #18903 we do so for local functions, where we can see all calls.
For top-level functions, we can assume that all *exported* functions are
demanded according to `topDmd` and thus get sound demands for
non-exported top-level functions.
The demand on `g` is crucial information for Nested CPR, which may the
go on and unbox `g` for the second pair component. That is true even if
that pair component may diverge, as is the case for the call site `g 13
0`, which throws a div-by-zero exception.
In `T18894b`, you can even see the new demand annotation enabling us to
eta-expand a function that we wouldn't be able to eta-expand without
Call Arity.
We only track bindings of function type in order not to risk huge compile-time
regressions, see `isInterestingTopLevelFn`.
There was a CoreLint check that rejected strict demand annotations on
recursive or top-level bindings, which seems completely unjustified.
All the cases I investigated were fine, so I removed it.
Fixes #18894.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3aae036eded89603756d025e0fac2ec0642edeaf">3aae036e</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-12-12T04:45:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Demand: Simplify `CU(U)` to `U` (#19005)
Both sub-demands encode the same information.
This is a trivial change and already affects a few regression tests
(e.g. `T5075`), so no separate regression test is necessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c647763954717d9853d08ff04eece7f1ddeae15c">c6477639</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-12-12T04:45:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: correctly copy the docs dir into the bindist #18669
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e033dd0512443140dcca5b3c90b84022d8caf942">e033dd05</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-12-12T10:52:19+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">mkDocs: support hadrian bindists #18973
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78580ba3f99565b0aecb25c4206718d4c8a52317">78580ba3</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-12-13T07:14:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove old .travis.yml
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c696bb2f4476e0ce4071e0d91687c1fe84405599">c696bb2f</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-12-14T13:37:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement type applications in patterns
The haddock submodule is also updated so that it understands the changes
to patterns.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e9debd4ceb068effe8ac81892d2cabcb8f55850">7e9debd4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-14T13:37:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimise nullary type constructor usage
During the compilation of programs GHC very frequently deals with
the `Type` type, which is a synonym of `TYPE 'LiftedRep`. This patch
teaches GHC to avoid expanding the `Type` synonym (and other nullary
type synonyms) during type comparisons, saving a good amount of work.
This optimisation is described in `Note [Comparing nullary type
synonyms]`.
To maximize the impact of this optimisation, we introduce a few
special-cases to reduce `TYPE 'LiftedRep` to `Type`. See
`Note [Prefer Type over TYPE 'LiftedPtrRep]`.
Closes #17958.
Metric Decrease:
T18698b
T1969
T12227
T12545
T12707
T14683
T3064
T5631
T5642
T9020
T9630
T9872a
T13035
haddock.Cabal
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92377c27e1a48d0d3776f65c7074dfeb122b46db">92377c27</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-14T13:41:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Optimise nullary type constructor usage"
This was inadvertently merged.
This reverts commit 7e9debd4ceb068effe8ac81892d2cabcb8f55850.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6f208327fc18cef34370525b075a0381e62e1da">d6f20832</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:39:53+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix haddock parse error
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fb8c7f8d30217e8075cde7ddc6e45575b3733ad">0fb8c7f8</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:39:53+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Remove GHC.Types.Unique.Map module"
This reverts commit 1c7c6f1afc8e7f7ba5d256780bc9d5bb5f3e7601.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae10b28c140837fa9e5933a0acff62ce29460c08">ae10b28c</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:39:54+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Profiling by info table mode (-hi)
This profiling mode creates bands by the address of the info table for
each closure. This provides a much more fine-grained profiling output
than any of the other profiling modes.
The `-hi` profiling mode does not require a profiling build.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f28c76fbdbd4b419874860ce58a299edf096cb04">f28c76fb</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:46:56+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -finfo-table-map which maps info tables to source positions
This new flag embeds a lookup table from the address of an info table
to information about that info table.
The main interface for consulting the map is the `lookupIPE` C function
> InfoProvEnt * lookupIPE(StgInfoTable *info)
The `InfoProvEnt` has the following structure:
> typedef struct InfoProv_{
> char * table_name;
> char * closure_desc;
> char * ty_desc;
> char * label;
> char * module;
> char * srcloc;
> } InfoProv;
>
> typedef struct InfoProvEnt_ {
> StgInfoTable * info;
> InfoProv prov;
> struct InfoProvEnt_ *link;
> } InfoProvEnt;
The source positions are approximated in a similar way to the source
positions for DWARF debugging information. They are only approximate but
in our experience provide a good enough hint about where the problem
might be. It is therefore recommended to use this flag in conjunction
with `-g<n>` for more accurate locations.
The lookup table is also emitted into the eventlog when it is available
as it is intended to be used with the `-hi` profiling mode.
Using this flag will significantly increase the size of the resulting
object file but only by a factor of 2-3x in our experience.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9190cef256d2d0d446711860d2a06e4e86294073">9190cef2</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:48:20+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add option to give each usage of a data constructor its own info table
The `-fdistinct-constructor-tables` flag will generate a fresh info
table for the usage of any data constructor. This is useful for
debugging as now by inspecting the info table, you can determine which
usage of a constructor caused that allocation rather than the old
situation where the info table always mapped to the definition site of
the data constructor which is useless.
In conjunction with `-hi` and `-finfo-table-map` this gives a more fine
grained understanding of where constructor allocations arise from in a
program.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e6da5e16766bbe27220729009286df80dae4b6d">6e6da5e1</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:48:21+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add whereFrom and whereFrom# primop
The `whereFrom` function provides a Haskell interface for using the
information created by `-finfo-table-map`. Given a Haskell value, the
info table address will be passed to the `lookupIPE` function in order
to attempt to find the source location information for that particular closure.
At the moment it's not possible to distinguish the absense of the map
and a failed lookup.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f56bdfea712b0c02f22fa8048052d44d2e80ef1">6f56bdfe</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:48:21+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for whereFrom#
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/578d868bc099c376a7d8311936841e73974fd906">578d868b</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:49:21+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add release notes for -hi, -finfo-table-map and -fdistinct-constructor-tables
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/17974840afd626eece0ad5195c4943385f3db2c5">17974840</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:49:23+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Turn on SourceNotes without -g
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2d77b5983c2a0744742539388e4eb19bfc03b29c">2d77b598</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:49:23+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd8d216aba49df8e1177a912dc0e3c8da7d79d7f">dd8d216a</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:49:23+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">debug info docs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86ba334b8c11d076ebf591974e4e330dabcec4aa">86ba334b</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-12-15T11:49:23+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Some more comments
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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.gitlab-ci.yml
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.gitlab/ci.sh
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.travis.yml
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compiler/GHC.hs
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compiler/GHC/Builtin/Names.hs
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compiler/GHC/Builtin/Types.hs
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compiler/GHC/Builtin/primops.txt.pp
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compiler/GHC/ByteCode/Asm.hs
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compiler/GHC/ByteCode/Linker.hs
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compiler/GHC/ByteCode/Types.hs
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compiler/GHC/Cmm.hs
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compiler/GHC/Cmm/CLabel.hs
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compiler/GHC/Cmm/CommonBlockElim.hs
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compiler/GHC/Cmm/Dataflow/Label.hs
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compiler/GHC/Cmm/Expr.hs
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compiler/GHC/Cmm/Liveness.hs
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compiler/GHC/Cmm/Node.hs
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compiler/GHC/Cmm/Opt.hs
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compiler/GHC/Cmm/Sink.hs
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compiler/GHC/Cmm/Utils.hs
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compiler/GHC/CmmToAsm/Dwarf/Types.hs
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compiler/GHC/CmmToAsm/Ppr.hs
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compiler/GHC/CmmToAsm/Reg/Graph/Stats.hs
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compiler/GHC/CmmToAsm/X86/CodeGen.hs
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compiler/GHC/CmmToC.hs
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compiler/GHC/CmmToLlvm/Base.hs
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compiler/GHC/Core.hs
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compiler/GHC/Core/Coercion.hs
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<h5>The diff was not included because it is too large.</h5>
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