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<h3>
Ben Gamari pushed to branch wip/chunked-unpackCString
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/0b02c227a83b3a0711a5d4e51b515a768f712c46">0b02c227</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-04-10T02:07:27+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-prim: Strictly in chunks of 32 characters
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<h4>1 changed file:</h4>
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libraries/ghc-prim/GHC/CString.hs
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<h4>Changes:</h4>
<li id="5550456b4c18a3437d117712bc1421c71cca5d98">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b02c227a83b3a0711a5d4e51b515a768f712c46#5550456b4c18a3437d117712bc1421c71cca5d98"><strong>libraries/ghc-prim/GHC/CString.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">@@ -93,23 +93,45 @@ the string and the current offset, saving a word for each character unpacked.</td>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"><span class="n" style="color: #333;">unpackCString</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE CONLIKE unpackCString# #-}</span></span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"><span class="n" style="color: #333;">unpackCString</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span></span>
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">ch</span> <span class="p">`</span><span class="n" style="color: #333;">eqChar</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="sc" style="color: #d14;">'</span><span class="se" style="color: #d14;">\0</span><span class="sc" style="color: #d14;">'</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">unpackCString</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">addr</span> <span class="p">`</span><span class="n" style="color: #333;">plusAddr</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [unpackCString# iterating over addr]</span></span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">indexCharOffAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See the NOINLINE note on unpackCString#</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="n" style="color: #333;">unpackCString</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unpackAppendCString'</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">addr</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"><span class="n" style="color: #333;">unpackAppendCString</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE unpackAppendCString# #-}</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See the NOINLINE note on unpackCString#</span></span>
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<pre style="margin: 0;">-<span id="LC107" class="line" lang="haskell"><span class="n" style="color: #333;">unpackAppendCString</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">ch</span> <span class="p">`</span><span class="n" style="color: #333;">eqChar</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="sc" style="color: #d14;">'</span><span class="se" style="color: #d14;">\0</span><span class="sc" style="color: #d14;">'</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">C</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">unpackAppendCString</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">addr</span> <span class="p">`</span><span class="n" style="color: #333;">plusAddr</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [unpackCString# iterating over addr]</span></span>
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112
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">indexCharOffAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="n" style="color: #333;">unpackAppendCString</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="n" style="color: #333;">rest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unpackAppendCString'</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">rest</span> <span class="n" style="color: #333;">addr</span></span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="cd">-- | This is an local helper to reduce duplication between</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'unpackCString#' and 'unpackAppendCString#'. Because it is inlined the</span></span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this gets specialised to @rest = []@ in the former case.</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="n" style="color: #333;">unpackAppendCString'</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE unpackAppendCString'# #-}</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="n" style="color: #333;">unpackAppendCString'</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">rest0</span> <span class="n" style="color: #333;">addr0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unpackChunk</span> <span class="n" style="color: #333;">addr0</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Laziness is expensive: it involves allocating a thunk, then an indirect</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- jump, perhaps some cache misses, etc. However, in practice we find that</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- most applications tend to use at least *some* of their unpacked string.</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Consequently we unpack eagerly in chunks of this many characters.</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Compared to fully-lazy unpacking this improves runtime of GHC by about</span></span>
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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 0.5%.</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackChunkLen</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">32</span><span class="o" style="font-weight: 600;">#</span></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"></span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackChunk</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</span><span class="p">]</span></span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">unpackChunk</span> <span class="n" style="color: #333;">addr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">goStrict</span> <span class="n" style="color: #333;">addr</span> <span class="n" style="color: #333;">unpackChunkLen</span></span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"></span>
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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="n" style="color: #333;">goStrict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</span><span class="p">]</span></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="n" style="color: #333;">goStrict</span> <span class="n" style="color: #333;">addr</span> <span class="n" style="color: #333;">n</span></span>
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124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">ch</span> <span class="p">`</span><span class="n" style="color: #333;">eqChar</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="sc" style="color: #d14;">'</span><span class="se" style="color: #d14;">\0</span><span class="sc" style="color: #d14;">'</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rest0</span></span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==#</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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126
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We've reached the end of our chunk, lazily unpack the next chunk</span></span>
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127
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unpackChunk</span> <span class="p">(</span><span class="n" style="color: #333;">addr</span> <span class="p">`</span><span class="n" style="color: #333;">plusAddr</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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128
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">C</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest</span></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">=</span></span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">rest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">goStrict</span> <span class="p">(</span><span class="n" style="color: #333;">addr</span> <span class="p">`</span><span class="n" style="color: #333;">plusAddr</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-#</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">C</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest</span></span>
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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [unpackCString# iterating over addr]</span></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">ch</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">indexCharOffAddr</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">addr</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">#</span></span>
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113
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135
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"></span>
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114
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136
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="n" style="color: #333;">unpackFoldrCString</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Addr</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Char</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 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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115
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137
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"></span>
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