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<h3>
Simon Peyton Jones pushed to branch wip/T18502
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/318bb17c9d3fbbe68eff706c38eb8e653cea3d83">318bb17c</a></strong>
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<span>by Oleg Grenrus</span>
<i>at 2020-07-28T20:54:13-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typo in haddock
Spotted by `vilpan` on `#haskell`
</pre>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/39c89862161bf488a6aca9372cbb67690f436ce7">39c89862</a></strong>
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<span>by Sergei Trofimovich</span>
<i>at 2020-07-28T20:54:50-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc/mk: don't build gmp packages for BIGNUM_BACKEND=native
Before this change make-based `BIGNUM_BACKEND=native` build was failing as:
```
x86_64-pc-linux-gnu-gcc: error: libraries/ghc-bignum/gmp/objs/*.o: No such file or directory
```
This happens because ghc.mk was pulling in gmp-dependent
ghc-bignum library unconditionally. The change avoid building
ghc-bignum.
Bug: https://gitlab.haskell.org/ghc/ghc/-/issues/18437
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/749ec85e74b98d70ba3aeed9440482e6000169c8">749ec85e</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-07-29T08:21:12+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add two bangs to improve perf of flattening
This tiny patch improves the compile time of flatten-heavy
programs by 1-2%, by adding two bangs.
Addresses (somewhat) #18502
This reduces allocation by
T9872b -1.1%
T9872d -3.3%
T5321Fun -0.2%
T5631 -0.2%
T5837 +0.1%
T6048 +0.1%
Metric Decrease:
T9872b
T9872d
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<h4>3 changed files:</h4>
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<a href="#8bdb62b981f38737157a853655e494433eea6796">
ghc.mk
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<a href="#36b8946721cfafb20918a66b3ffb21b3a4c37935">
libraries/base/GHC/IO.hs
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<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/49d8597c9da32a5b674987cdc6ee227bcb627bb2...749ec85e74b98d70ba3aeed9440482e6000169c8#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1891,7 +1891,9 @@ substForAllCoBndrUsingLC sym sco (LC subst lc_env) tv co</td>
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<pre style="margin: 0;"> <span id="LC1891" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC1892" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For the inverse operation, see 'liftCoMatch'</span></span>
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<pre style="margin: 0;"> <span id="LC1893" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_subst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LiftingContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<pre style="margin: 0;">-<span id="LC1894" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_subst</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1894" class="line" lang="haskell"><span class="n" style="color: #333;">ty_co_subst</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- !lc: making this function strict in lc allows callers to</span></span>
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<pre style="margin: 0;">+<span id="LC1896" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pass its two components separately, rather than boxing them</span></span>
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<pre style="margin: 0;"> <span id="LC1897" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2864,9 +2866,9 @@ simplifyArgsWorker orig_ki_binders orig_inner_ki orig_fvs</td>
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<pre style="margin: 0;"> <span id="LC2866" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- need a coercion (kind_co :: old_kind ~ new_kind).</span></span>
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<pre style="margin: 0;"> <span id="LC2867" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC2868" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The bangs here have been observed to improve performance</span></span>
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<pre style="margin: 0;">-<span id="LC2867" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- significantly in optimized builds<span class="idiff left right">.</span></span></span>
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<pre style="margin: 0;">-<span id="LC2868" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">kind_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC2869" class="line" lang="haskell"> <span class="n" style="color: #333;">liftCoSubst</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">lc</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoBinderType</span> <span class="n" style="color: #333;">binder</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2869" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- significantly in optimized builds<span class="idiff left right">; see #18502</span></span></span>
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<pre style="margin: 0;">+<span id="LC2870" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">!</span></span><span class="n" style="color: #333;">kind_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2871" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">liftCoSubst</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">lc</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoBinderType</span> <span class="n" style="color: #333;">binder</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2872" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">casted_xi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xi</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kind_co</span></span>
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<pre style="margin: 0;"> <span id="LC2873" class="line" lang="haskell"> <span class="n" style="color: #333;">casted_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoherenceLeftCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">kind_co</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC2874" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -656,7 +656,9 @@ BUILD_DIRS += $(patsubst %, libraries/%, $(PACKAGES_STAGE1))</td>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="make"><span class="nv" style="color: #008080;">BUILD_DIRS</span> <span class="o" style="font-weight: 600;">+=</span> <span class="nf" style="color: #900; font-weight: 600;">$(</span><span class="nb" style="color: #0086b3;">patsubst</span> %, libraries/%, <span class="nf" style="color: #900; font-weight: 600;">$(</span><span class="nb" style="color: #0086b3;">filter-out</span> <span class="nv" style="color: #008080;">$(PACKAGES_STAGE1)</span>,<span class="nv" style="color: #008080;">$(PACKAGES_STAGE0)</span><span class="nf" style="color: #900; font-weight: 600;">))</span></span>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="make"><span class="k" style="font-weight: 600;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="make"></span>
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="make"><span class="k" style="font-weight: 600;">ifeq</span> <span class="nv" style="color: #008080;">"$(BIGNUM_BACKEND)" "gmp"</span></span>
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<pre style="margin: 0;"> <span id="LC660" class="line" lang="make"><span class="nv" style="color: #008080;">BUILD_DIRS</span> <span class="o" style="font-weight: 600;">+=</span> libraries/ghc-bignum/gmp</span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="make"><span class="k" style="font-weight: 600;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="make"><span class="nv" style="color: #008080;">BUILD_DIRS</span> <span class="o" style="font-weight: 600;">+=</span> utils/haddock</span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="make"><span class="nv" style="color: #008080;">BUILD_DIRS</span> <span class="o" style="font-weight: 600;">+=</span> utils/haddock/doc</span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="make"><span class="nv" style="color: #008080;">BUILD_DIRS</span> <span class="o" style="font-weight: 600;">+=</span> compiler</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/49d8597c9da32a5b674987cdc6ee227bcb627bb2...749ec85e74b98d70ba3aeed9440482e6000169c8#36b8946721cfafb20918a66b3ffb21b3a4c37935"><strong>libraries/base/GHC/IO.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -173,7 +173,7 @@ catchException !io handler = catch io handler</td>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @IO Int -> (ArithException -> IO Int) -> IO Int@ then the handler may</span></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- get run with @DivideByZero@ as an argument, or an @ErrorCall \"urk\"@</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- exception may be propagated further up. If you call it again, you</span></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- might get <span class="idiff left right">a </span>the opposite behaviour. This is ok, because 'catch' is an</span></span>
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- might get the opposite behaviour. This is ok, because 'catch' is an</span></span>
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177
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'IO' computation.</span></span>
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178
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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179
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179
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"><span class="n" style="color: #333;">catch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Exception</span> <span class="n" style="color: #333;">e</span></span>
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