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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/b024e2891d06a81b3fd824f33fc72fb805e03c8f">b024e289</a></strong>
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<span>by Giles Anderson</span>
<i>at 2019-04-15T10:20:29Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document how -O3 is handled by GHC
-O2 is the highest value of optimization.
-O3 will be reverted to -O2.
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/4b1ef06d45fb3cd226b5ec4217e975d48b85e645">4b1ef06d</a></strong>
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<span>by Giles Anderson</span>
<i>at 2019-04-15T10:20:29Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to docs/users_guide/using-optimisation.rst</pre>
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<h4>1 changed file:</h4>
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docs/users_guide/using-optimisation.rst
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<h4>Changes:</h4>
<li id="2e45f2cd303dd998950a7c8042e796a5b2abd64f">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/1825f50d1736401724ef644e4d481cc26e8f47e5...4b1ef06d45fb3cd226b5ec4217e975d48b85e645#2e45f2cd303dd998950a7c8042e796a5b2abd64f"><strong>docs/users_guide/using-optimisation.rst</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">@@ -88,6 +88,17 @@ So, for example, ``ghc -c Foo.hs``</td>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext"> runtime or space *worse* if you're unlucky. They are normally turned</span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="plaintext"> on or off individually.</span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="plaintext">.. ghc-flag:: -O⟨n⟩</span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="plaintext"> :shortdesc: Any -On where n > 2 is the same as -O2.</span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="plaintext"> :type: dynamic</span>
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<td class="diff-line-num new new_line" data-linenumber="94" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext"> :reverse: -O0</span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext"> :category: optimization-levels</span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext"> .. index::</span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext"> single: optimise; aggressively</span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext"> Any -On where n > 2 is the same as -O2.</span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="plaintext">We don't use a ``-O*`` flag for day-to-day work. We use ``-O`` to get</span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext">respectable speed; e.g., when we want to measure something. When we want</span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="plaintext">to go for broke, we tend to use ``-O2`` (and we go for lots of coffee</span>
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