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<h3>
Ben Gamari pushed to branch wip/T13253
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/03a708ba8e8c323b07d8d2e0115d6eb59987cc02">03a708ba</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-06-25T03:54:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable large address space optimization on windows.
Starting with Win 8.1/Server 2012 windows no longer preallocates
page tables for reserverd memory eagerly, which prevented us from
using this approach in the past.
We also try to allocate the heap high in the memory space.
Hopefully this makes it easier to allocate things in the low
4GB of memory that need to be there. Like jump islands for the
linker.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e6d3d09d983337df30d12e5aaa96bae9b81b324">7e6d3d09</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-06-25T03:54:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">In `:break ident` allow out of scope and nested identifiers (Fix #3000)
This patch fixes the bug and implements the feature request of #3000.
1. If `Module` is a real module name and `identifier` a name of a
top-level function in `Module` then `:break Module.identifer` works
also for an `identifier` that is out of scope.
2. Extend the syntax for `:break identifier` to:
:break [ModQual.]topLevelIdent[.nestedIdent]...[.nestedIdent]
`ModQual` is optional and is either the effective name of a module or
the local alias of a qualified import statement.
`topLevelIdent` is the name of a top level function in the module
referenced by `ModQual`.
`nestedIdent` is optional and the name of a function nested in a let or
where clause inside the previously mentioned function `nestedIdent` or
`topLevelIdent`.
If `ModQual` is a module name, then `topLevelIdent` can be any top level
identifier in this module. If `ModQual` is missing or a local alias of a
qualified import, then `topLevelIdent` must be in scope.
Breakpoints can be set on arbitrarily deeply nested functions, but the
whole chain of nested function names must be specified.
3. To support the new functionality rewrite the code to tab complete `:break`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30e42652ed895c3ed086e7834be46f93ba1cc61b">30e42652</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">make: Respect XELATEX variable
Previously we simply ignored the XELATEX variable when building
PDF documentation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4acc2934952f4849c2082015d9bebef446d46545">4acc2934</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/make: Detect makeindex
Previously we would simply assume that makeindex was available.
Now we correctly detect it in `configure` and respect this conclusion in
hadrian and make.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d61f866b43d3385be3a8521ba24503c13e8d404">0d61f866</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-25T03:54:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expunge GhcTcId
GHC.Hs.Extension had
type GhcPs = GhcPass 'Parsed
type GhcRn = GhcPass 'Renamed
type GhcTc = GhcPass 'Typechecked
type GhcTcId = GhcTc
The last of these, GhcTcId, is a vestige of the past.
This patch expunges it from GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ddbed4ad1772ac7dfc96b352a3dc35d958a5f9b">8ddbed4a</a></strong>
<div>
<span>by Adam Wespiser</span>
<i>at 2020-06-25T03:54:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add examples to Data.Traversable
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/284001d00995c82a1f2b38f696138ad683b5364b">284001d0</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-06-25T03:54:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export readBinIface_
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90f438724dbc1ef9e4b371034d44170738fe3224">90f43872</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-06-25T03:54:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export everything from HsToCore.
This lets us reuse these functions in haddock, avoiding synchronization bugs.
Also fixed some divergences with haddock in that file
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7dd6da7e066872a949be7c914cc700182307cd2">c7dd6da7</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-25T03:54:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up haddock hyperlinks of GHC.* (part1)
This updates haddock comments only.
This patch focuses to update for hyperlinks in GHC API's haddock comments,
because broken links especially discourage newcomers.
This includes the following hierarchies:
- GHC.Hs.*
- GHC.Core.*
- GHC.Stg.*
- GHC.Cmm.*
- GHC.Types.*
- GHC.Data.*
- GHC.Builtin.*
- GHC.Parser.*
- GHC.Driver.*
- GHC top
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1eb997a84669f158de9dd16a9e54d279cec22293">1eb997a8</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-25T03:54:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up haddock hyperlinks of GHC.* (part2)
This updates haddock comments only.
This patch focuses to update for hyperlinks in GHC API's haddock comments,
because broken links especially discourage newcomers.
This includes the following hierarchies:
- GHC.Iface.*
- GHC.Llvm.*
- GHC.Rename.*
- GHC.Tc.*
- GHC.HsToCore.*
- GHC.StgToCmm.*
- GHC.CmmToAsm.*
- GHC.Runtime.*
- GHC.Unit.*
- GHC.Utils.*
- GHC.SysTools.*
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67a86b4d4d21954bae7aaddec7617228025a8270">67a86b4d</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-06-25T03:54:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add MonadZip and MonadFix instances for Complex
These instances are taken from
https://hackage.haskell.org/package/linear-1.21/docs/Linear-Instances.html
They are the unique possible, so let they be in `base`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c50ef26edaa537c0a13ac1a574632f9078c5671b">c50ef26e</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-06-25T03:54:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">test suite: add reproducer for #17516
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe281b27d544920a2c2ddc00f6284006b85ab294">fe281b27</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-06-25T03:54:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable maxBound checks for OverloadedLists (Fixes #18172)
Consider the Literal `[256] :: [Data.Word.Word8]`
When the `OverloadedLists` extension is not active, then the `ol_ext` field
in the `OverLitTc` record that is passed to the function `getIntegralLit`
contains the type `Word8`. This is a simple type, and we can use its
type constructor immediately for the `warnAboutOverflowedLiterals` function.
When the `OverloadedLists` extension is active, then the `ol_ext` field
contains the type family `Item [Word8]`. The function `nomaliseType` is used
to convert it to the needed type `Word8`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a788d4d17ad332dbfbe08e6822c52ae0de6ef496">a788d4d1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-25T03:54:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Hash: Simplify freeing of HashListChunks
While looking at #18348 I noticed that the treatment of HashLists are a
bit more complex than necessary (which lead to some initial confusion on
my part). Specifically, we allocate HashLists in chunks. Each chunk
allocation makes two allocations: one for the chunk itself and one for a
HashListChunk to link together the chunks for the purposes of freeing.
Simplify this (and hopefully make the relationship between these
clearer) but allocating the HashLists and HashListChunk in a single
malloc. This will both make the implementation easier to follow and
reduce C heap fragmentation.
Note that even after this patch we fail to bound the size of the free
HashList pool. However, this is a separate bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3c2d59bafe253dd7e4966a46564fb16acb1af5c">d3c2d59b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-06-25T03:54:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: avoid overflow on 32-bit arch (#18375)
We're now correctly computing allocated bytes on 32-bit arch, so we get
huge increases.
Metric Increase:
haddock.Cabal
haddock.base
haddock.compiler
space_leak_001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a3d69dc6c2134afe239caf4f881ba5542d2c2be0">a3d69dc6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-06-25T23:06:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Core.Unify: Make UM actions one-shot by default
This MR makes the UM monad in GHC.Core.Unify into a one-shot
monad. See the long Note [The one-shot state monad trick].
See also #18202 and !3309, which applies this to all Reader/State-like
monads in GHC for compile-time perf improvements. The pattern used
here enables something similar to the state-hack, but is applicable to
user-defined monads, not just `IO`.
Metric Decrease 'runtime/bytes allocated' (test_env='i386-linux-deb9'):
haddock.Cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f8cc1bf08622301beaa62da603c8d5d78154214">9f8cc1bf</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-25T23:09:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make arityType deal with join points
As Note [Eta-expansion and join points] describes,
this patch makes arityType deal correctly with join points.
What was there before was not wrong, but yielded lower
arities than it could.
Fixes #18328
In base GHC this makes no difference to nofib.
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
n-body -0.1% -0.1% -1.2% -1.1% 0.0%
--------------------------------------------------------------------------------
Min -0.1% -0.1% -55.0% -56.5% 0.0%
Max -0.0% 0.0% +16.1% +13.4% 0.0%
Geometric Mean -0.0% -0.0% -30.1% -31.0% -0.0%
But it starts to make real difference when we land the change to the
way mkDupableAlts handles StrictArg, in fixing #13253 and friends.
I think this is because we then get more non-inlined join points.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71bfe7871f864f3ac8eab8c3d6d2f7ce58ccf5f4">71bfe787</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-25T23:09:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve eta-expansion using ArityType
As #18355 shows, we were failing to preserve one-shot info when
eta-expanding. It's rather easy to fix, by using ArityType more,
rather than just Arity.
This patch is important to suport the one-shot monad trick;
see #18202.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8db58dba8402ad32011c1fb6d7d56501085d647">d8db58db</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-25T23:09:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reduce result discount in conSize
Ticket #18282 showed that the result discount given by conSize
was massively too large. This patch reduces that discount to
a constant 10, which just balances the cost of the constructor
application itself.
Note [Constructor size and result discount] elaborates, as
does the ticket #18282.
Reducing result discount reduces inlining, which affects perf. I
found that I could increase the unfoldingUseThrehold from 80 to 90 in
compensation; in combination with the result discount change I get
these overall nofib numbers:
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
boyer -0.3% +5.4% +0.7% +1.0% 0.0%
cichelli -0.3% +5.9% -9.9% -9.5% 0.0%
compress2 -0.4% +9.6% +7.2% +6.4% 0.0%
constraints -0.3% +0.2% -3.0% -3.4% 0.0%
cryptarithm2 -0.3% -3.9% -2.2% -2.4% 0.0%
gamteb -0.4% +2.5% +2.8% +2.8% 0.0%
life -0.3% -2.2% -4.7% -4.9% 0.0%
lift -0.3% -0.3% -0.8% -0.5% 0.0%
linear -0.3% -0.1% -4.1% -4.5% 0.0%
mate -0.2% +1.4% -2.2% -1.9% -14.3%
parser -0.3% -2.1% -5.4% -4.6% 0.0%
puzzle -0.3% +2.1% -6.6% -6.3% 0.0%
simple -0.4% +2.8% -3.4% -3.3% -2.2%
veritas -0.1% +0.7% -0.6% -1.1% 0.0%
wheel-sieve2 -0.3% -19.2% -24.9% -24.5% -42.9%
--------------------------------------------------------------------------------
Min -0.4% -19.2% -24.9% -24.5% -42.9%
Max +0.1% +9.6% +7.2% +6.4% +33.3%
Geometric Mean -0.3% -0.0% -3.0% -2.9% -0.3%
I'm ok with these numbers, remembering that this change removes
an *exponential* increase in code size in some in-the-wild cases.
I investigated compress2. The difference is entirely caused by this
function no longer inlining
WriteRoutines.$woutputCodes
= \ (w :: [CodeEvent]) ->
let result_s1Sr
= case WriteRoutines.outputCodes_$s$woutput w 0# 0# 8# 9# of
(# ww1, ww2 #) -> (ww1, ww2)
in (# case result_s1Sr of (x, _) ->
map @Int @Char WriteRoutines.outputCodes1 x
, case result_s1Sr of { (_, y) -> y } #)
It was right on the cusp before, driven by the excessive result
discount. Too bad!
Metric Decrease:
T12227
T12545
T15263
T1969
T5030
T9872a
T9872c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df525f2b1d18d2c21c42dae1612d31ef1ced489e">df525f2b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-25T23:09:09-04:00</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 two significant 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. Then in postInlineUnconditionally
use that info to avoid inling something many many times.
Actual changes:
* See the occ_n_br field of OneOcc.
* postInlineUnconditionally
See Note [Suppress exponential blowup] in GHC.Core.Opt.Simplify.Utils
2. Change the way that mkDupableCont handles StrictArg.
The details are explained in GHC.Core.Opt.Simplify
Note [Duplicating StrictArg]
Current nofib run
Program Size Allocs Runtime Elapsed TotalMem
--------------------------------------------------------------------------------
VS -0.3% +115.9% +12.1% +11.2% 0.0%
boyer2 -0.3% +10.0% +3.5% +4.0% 0.0%
cryptarithm2 -0.3% +39.0% +16.6% +16.1% 0.0%
gamteb -0.3% +4.1% -0.0% +0.4% 0.0%
last-piece -0.3% +1.4% -1.1% -0.4% 0.0%
mate -0.4% -11.1% -8.5% -9.0% 0.0%
multiplier -0.3% -2.2% -1.5% -1.5% 0.0%
transform -0.3% +3.4% +0.5% +0.8% 0.0%
--------------------------------------------------------------------------------
Min -0.8% -11.1% -8.5% -9.0% 0.0%
Max -0.3% +115.9% +30.1% +26.4% 0.0%
Geometric Mean -0.3% +1.0% +1.0% +1.0% -0.0%
Should investigate these numbers.
But the tickets are indeed cured, I think.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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<a href="#d0d96a6d03668aeab20ebe05e2c4ccb798c7e64c">
compiler/GHC.hs
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compiler/GHC/Builtin/Types.hs
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compiler/GHC/Builtin/Types/Prim.hs
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compiler/GHC/Builtin/Utils.hs
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<a href="#5c66928780aaad0eb5888511dc4b0b08492c69fa">
compiler/GHC/ByteCode/Types.hs
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compiler/GHC/Cmm/CLabel.hs
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compiler/GHC/Cmm/Dataflow/Block.hs
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compiler/GHC/Cmm/Info.hs
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compiler/GHC/CmmToAsm/CFG.hs
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compiler/GHC/CmmToAsm/Dwarf/Constants.hs
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compiler/GHC/CmmToAsm/Monad.hs
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compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs
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compiler/GHC/CmmToAsm/SPARC/CodeGen/Base.hs
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compiler/GHC/Core.hs
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compiler/GHC/Core/Class.hs
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compiler/GHC/Core/DataCon.hs
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compiler/GHC/Core/FVs.hs
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compiler/GHC/Core/InstEnv.hs
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compiler/GHC/Core/Lint.hs
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compiler/GHC/Core/Make.hs
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compiler/GHC/Core/Map.hs
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compiler/GHC/Core/Opt/Arity.hs
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<a href="#bac3d5159a5688007de3aa3f5c4e50569677b347">
compiler/GHC/Core/Opt/OccurAnal.hs
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<a href="#cc763cdd1967f5d921161a32f64136cfcf0332c5">
compiler/GHC/Core/Opt/SetLevels.hs
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<li class="file-stats">
<a href="#f168a93cde5e2aec2441d6331dfe500172df4af3">
compiler/GHC/Core/Opt/Simplify.hs
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<a href="#48fbb5cdea308650de5756521feb28ec68819b9b">
compiler/GHC/Core/Opt/Simplify/Utils.hs
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<a href="#d01de95d8c71d4dec6a9a59146186e29a5b3fd38">
compiler/GHC/Core/Rules.hs
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<a href="#11ffe98a94d798427bc600e4fcfe899407536346">
compiler/GHC/Core/SimpleOpt.hs
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<a href="#708fab0a51bd47227233eda4698e750ff6de66e0">
compiler/GHC/Core/Subst.hs
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<h5>The diff was not included because it is too large.</h5>
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