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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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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af5e3a885ddd09dd5f550552c535af3661ff3dbf">af5e3a88</a></strong>
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<span>by Artem Pelenitsyn</span>
<i>at 2020-06-05T03:18:49-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: fix sign confusion in log1mexp implementation (fix #17125)
author: claude (https://gitlab.haskell.org/trac-claude)
The correct threshold for log1mexp is -(log 2) with the current specification
of log1mexp. This change improves accuracy for large negative inputs.
To avoid code duplication, a small helper function is added;
it isn't the default implementation in Floating because it needs Ord.
This patch does nothing to address that the Haskell specification is
different from that in common use in other languages.
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<h4>1 changed file:</h4>
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<a href="#f4df73449102e301ecaa0e5dd6d41b079b28b6a4">
libraries/base/GHC/Float.hs
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<h4>Changes:</h4>
<li id="f4df73449102e301ecaa0e5dd6d41b079b28b6a4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af5e3a885ddd09dd5f550552c535af3661ff3dbf#f4df73449102e301ecaa0e5dd6d41b079b28b6a4"><strong>libraries/base/GHC/Float.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">@@ -142,6 +142,14 @@ class (Fractional a) => Floating a where</td>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"> <span class="n" style="color: #333;">log1pexp</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1p</span> <span class="p">(</span><span class="n" style="color: #333;">exp</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"> <span class="n" style="color: #333;">log1mexp</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1p</span> <span class="p">(</span><span class="n" style="color: #333;">negate</span> <span class="p">(</span><span class="n" style="color: #333;">exp</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"><span class="cd">-- | Default implementation for @'log1mexp'@ requiring @'Ord'@ to test</span></span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- against a threshold to decide which implementation variant to use.</span></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"><span class="n" style="color: #333;">log1mexpOrd</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ord</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Floating</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE log1mexpOrd #-}</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"><span class="n" style="color: #333;">log1mexpOrd</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">></span> <span class="o" style="font-weight: 600;">-</span><span class="p">(</span><span class="n" style="color: #333;">log</span> <span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log</span> <span class="p">(</span><span class="n" style="color: #333;">negate</span> <span class="p">(</span><span class="n" style="color: #333;">expm1</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1p</span> <span class="p">(</span><span class="n" style="color: #333;">negate</span> <span class="p">(</span><span class="n" style="color: #333;">exp</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"><span class="cd">-- | Efficient, machine-independent access to the components of a</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- floating-point number.</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealFrac</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Floating</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">RealFloat</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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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">@@ -399,9 +407,7 @@ instance Floating Float where</td>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="haskell"> <span class="n" style="color: #333;">log1p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1pFloat</span></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"> <span class="n" style="color: #333;">expm1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expm1Float</span></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"> <span class="n" style="color: #333;">log1mexp</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">log</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log</span> <span class="p">(</span><span class="n" style="color: #333;">negate</span> <span class="p">(</span><span class="n" style="color: #333;">expm1Float</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1pFloat</span> <span class="p">(</span><span class="n" style="color: #333;">negate</span> <span class="p">(</span><span class="n" style="color: #333;">exp</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"> <span class="n" style="color: #333;">log1mexp</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1mexpOrd</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINE log1mexp #-}</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="n" style="color: #333;">log1pexp</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">18</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1pFloat</span> <span class="p">(</span><span class="n" style="color: #333;">exp</span> <span class="n" style="color: #333;">a</span><span class="p">)</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">@@ -540,9 +546,7 @@ instance Floating Double where</td>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"> <span class="n" style="color: #333;">log1p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1pDouble</span></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"> <span class="n" style="color: #333;">expm1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expm1Double</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"> <span class="n" style="color: #333;">log1mexp</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">log</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log</span> <span class="p">(</span><span class="n" style="color: #333;">negate</span> <span class="p">(</span><span class="n" style="color: #333;">expm1Double</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC545" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1pDouble</span> <span class="p">(</span><span class="n" style="color: #333;">negate</span> <span class="p">(</span><span class="n" style="color: #333;">exp</span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"> <span class="n" style="color: #333;">log1mexp</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1mexpOrd</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINE log1mexp #-}</span></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"> <span class="n" style="color: #333;">log1pexp</span> <span class="n" style="color: #333;">a</span></span>
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552
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">18</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">log1pDouble</span> <span class="p">(</span><span class="n" style="color: #333;">exp</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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