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% (c) The University of Glasgow, 2000-2006
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\section{Fast integers, etc... booleans moved to FastBool for using panic}
\begin{code}
<pre><a name="line-1"></a>
<a name="line-2"></a><span class='hs-comment'>--Even if the optimizer could handle boxed arithmetic equally well,</span>
<a name="line-3"></a><span class='hs-comment'>--this helps automatically check the sources to make sure that</span>
<a name="line-4"></a><span class='hs-comment'>--it's only used in an appropriate pattern of efficiency.</span>
<a name="line-5"></a><span class='hs-comment'>--(it also makes `let`s and `case`s stricter...)</span>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-comment'>-- | Fast integers, characters and pointer types for use in many parts of GHC</span>
<a name="line-8"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>FastTypes</span> <span class='hs-layout'>(</span>
<a name="line-9"></a> <span class='hs-comment'>-- * FastInt</span>
<a name="line-10"></a> <span class='hs-conid'>FastInt</span><span class='hs-layout'>,</span>
<a name="line-11"></a>
<a name="line-12"></a> <span class='hs-comment'>-- ** Getting in and out of FastInt</span>
<a name="line-13"></a> <span class='hs-sel'>_ILIT</span><span class='hs-layout'>,</span> <span class='hs-varid'>iBox</span><span class='hs-layout'>,</span> <span class='hs-varid'>iUnbox</span><span class='hs-layout'>,</span>
<a name="line-14"></a>
<a name="line-15"></a> <span class='hs-comment'>-- ** Arithmetic on FastInt</span>
<a name="line-16"></a> <span class='hs-layout'>(</span><span class='hs-varop'>+#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>-#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>*#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>quotFastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>negateFastInt</span><span class='hs-layout'>,</span>
<a name="line-17"></a> <span class='hs-comment'>--quotRemFastInt is difficult because unboxed values can't</span>
<a name="line-18"></a> <span class='hs-comment'>--be tupled, but unboxed tuples aren't portable. Just use</span>
<a name="line-19"></a> <span class='hs-comment'>-- nuisance boxed quotRem and rely on optimization.</span>
<a name="line-20"></a> <span class='hs-layout'>(</span><span class='hs-varop'>==#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><=#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>=#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-varid'>minFastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>maxFastInt</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-comment'>--prefer to distinguish operations, not types, between</span>
<a name="line-23"></a> <span class='hs-comment'>--signed and unsigned.</span>
<a name="line-24"></a> <span class='hs-comment'>--left-shift is the same for 'signed' and 'unsigned' numbers</span>
<a name="line-25"></a> <span class='hs-varid'>shiftLFastInt</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-comment'>--right-shift isn't the same for negative numbers (ones with</span>
<a name="line-27"></a> <span class='hs-comment'>--the highest-order bit '1'). If you don't care because the</span>
<a name="line-28"></a> <span class='hs-comment'>--number you're shifting is always nonnegative, use the '_' version</span>
<a name="line-29"></a> <span class='hs-comment'>--which should just be the fastest one.</span>
<a name="line-30"></a> <span class='hs-varid'>shiftR_FastInt</span><span class='hs-layout'>,</span>
<a name="line-31"></a> <span class='hs-comment'>--"L' = logical or unsigned shift; 'A' = arithmetic or signed shift</span>
<a name="line-32"></a> <span class='hs-varid'>shiftRLFastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>shiftRAFastInt</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-varid'>bitAndFastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>bitOrFastInt</span><span class='hs-layout'>,</span>
<a name="line-34"></a> <span class='hs-comment'>--add more operations to this file as you need them</span>
<a name="line-35"></a>
<a name="line-36"></a> <span class='hs-comment'>-- * FastChar</span>
<a name="line-37"></a> <span class='hs-conid'>FastChar</span><span class='hs-layout'>,</span>
<a name="line-38"></a>
<a name="line-39"></a> <span class='hs-comment'>-- ** Getting in and out of FastChar</span>
<a name="line-40"></a> <span class='hs-sel'>_CLIT</span><span class='hs-layout'>,</span> <span class='hs-varid'>cBox</span><span class='hs-layout'>,</span> <span class='hs-varid'>cUnbox</span><span class='hs-layout'>,</span>
<a name="line-41"></a>
<a name="line-42"></a> <span class='hs-comment'>-- ** Operations on FastChar</span>
<a name="line-43"></a> <span class='hs-varid'>fastOrd</span><span class='hs-layout'>,</span> <span class='hs-varid'>fastChr</span><span class='hs-layout'>,</span> <span class='hs-varid'>eqFastChar</span><span class='hs-layout'>,</span>
<a name="line-44"></a> <span class='hs-comment'>--note, fastChr is "unsafe"Chr: it doesn't check for</span>
<a name="line-45"></a> <span class='hs-comment'>--character values above the range of Unicode</span>
<a name="line-46"></a>
<a name="line-47"></a> <span class='hs-comment'>-- * FastPtr</span>
<a name="line-48"></a> <span class='hs-conid'>FastPtr</span><span class='hs-layout'>,</span>
<a name="line-49"></a>
<a name="line-50"></a> <span class='hs-comment'>-- ** Getting in and out of FastPtr</span>
<a name="line-51"></a> <span class='hs-varid'>pBox</span><span class='hs-layout'>,</span> <span class='hs-varid'>pUnbox</span><span class='hs-layout'>,</span>
<a name="line-52"></a>
<a name="line-53"></a> <span class='hs-comment'>-- ** Casting FastPtrs</span>
<a name="line-54"></a> <span class='hs-varid'>castFastPtr</span>
<a name="line-55"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-56"></a>
<a name="line-57"></a><span class='hs-cpp'>#include "HsVersions.h"</span>
<a name="line-58"></a>
<a name="line-59"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__)</span>
<a name="line-60"></a>
<a name="line-61"></a><span class='hs-comment'>-- Import the beggars</span>
<a name="line-62"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="FastInt"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span><span class='hs-cpp'>#</span>
<a name="line-65"></a>
<a name="line-66"></a><span class='hs-comment'>--in case it's a macro, don't lexically feed an argument!</span>
<a name="line-67"></a><span class='hs-comment'>--e.g. #define _ILIT(x) (x#) , #define _ILIT(x) (x :: FastInt)</span>
<a name="line-68"></a><span class='hs-sel'>_ILIT</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>I</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-69"></a><span class='hs-comment'>--perhaps for accomodating caseless-leading-underscore treatment,</span>
<a name="line-70"></a><span class='hs-comment'>--something like _iLIT or iLIT would be better?</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="iBox"></a><span class='hs-definition'>iBox</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span>
<a name="line-73"></a><a name="iUnbox"></a><span class='hs-definition'>iUnbox</span> <span class='hs-layout'>(</span><span class='hs-conid'>I</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-74"></a><a name="quotFastInt"></a><span class='hs-definition'>quotFastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>quotInt</span><span class='hs-cpp'>#</span>
<a name="line-75"></a><a name="negateFastInt"></a><span class='hs-definition'>negateFastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>negateInt</span><span class='hs-cpp'>#</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="shiftLFastInt"></a><span class='hs-comment'>--I think uncheckedIShiftL# and uncheckedIShiftRL# are the same</span>
<a name="line-78"></a><span class='hs-comment'>--as uncheckedShiftL# and uncheckedShiftRL# ...</span>
<a name="line-79"></a><span class='hs-comment'>--should they be used? How new are they?</span>
<a name="line-80"></a><span class='hs-comment'>--They existed as far back as GHC 6.0 at least...</span>
<a name="line-81"></a><span class='hs-definition'>shiftLFastInt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uncheckedIShiftL</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-82"></a><a name="shiftR_FastInt"></a><span class='hs-definition'>shiftR_FastInt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uncheckedIShiftRL</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-83"></a><a name="shiftRLFastInt"></a><span class='hs-definition'>shiftRLFastInt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uncheckedIShiftRL</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-84"></a><a name="shiftRAFastInt"></a><span class='hs-definition'>shiftRAFastInt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uncheckedIShiftRA</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-85"></a><a name="bitAndFastInt"></a><span class='hs-comment'>--{-# INLINE shiftLNonnegativeFastInt #-}</span>
<a name="line-86"></a><span class='hs-comment'>--{-# INLINE shiftRNonnegativeFastInt #-}</span>
<a name="line-87"></a><span class='hs-comment'>--shiftLNonnegativeFastInt n p = word2Int#((int2Word# n) `uncheckedShiftL#` p)</span>
<a name="line-88"></a><span class='hs-comment'>--shiftRNonnegativeFastInt n p = word2Int#((int2Word# n) `uncheckedShiftRL#` p)</span>
<a name="line-89"></a><span class='hs-definition'>bitAndFastInt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>word2Int</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>and</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>int2Word</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>int2Word</span><span class='hs-cpp'>#</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-90"></a><a name="bitOrFastInt"></a><span class='hs-definition'>bitOrFastInt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>word2Int</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>or</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>int2Word</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>int2Word</span><span class='hs-cpp'>#</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="FastChar"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>FastChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Char</span><span class='hs-cpp'>#</span>
<a name="line-93"></a><span class='hs-sel'>_CLIT</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>C</span><span class='hs-cpp'>#</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span>
<a name="line-94"></a><a name="cBox"></a><span class='hs-definition'>cBox</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>C</span><span class='hs-cpp'>#</span> <span class='hs-varid'>c</span>
<a name="line-95"></a><a name="cUnbox"></a><span class='hs-definition'>cUnbox</span> <span class='hs-layout'>(</span><span class='hs-conid'>C</span><span class='hs-cpp'>#</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-96"></a><a name="fastOrd"></a><span class='hs-definition'>fastOrd</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ord</span><span class='hs-cpp'>#</span> <span class='hs-varid'>c</span>
<a name="line-97"></a><a name="fastChr"></a><span class='hs-definition'>fastChr</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>chr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span>
<a name="line-98"></a><a name="eqFastChar"></a><span class='hs-definition'>eqFastChar</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>eqChar</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-99"></a>
<a name="line-100"></a><a name="FastPtr"></a><span class='hs-comment'>--note that the type-parameter doesn't provide any safety</span>
<a name="line-101"></a><a name="FastPtr"></a><span class='hs-comment'>--when it's a synonym, but as long as we keep it compiling</span>
<a name="line-102"></a><a name="FastPtr"></a><span class='hs-comment'>--with and without __GLASGOW_HASKELL__ defined, it's fine.</span>
<a name="line-103"></a><a name="FastPtr"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>FastPtr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Addr</span><span class='hs-cpp'>#</span>
<a name="line-104"></a><a name="pBox"></a><span class='hs-definition'>pBox</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>p</span>
<a name="line-105"></a><a name="pUnbox"></a><span class='hs-definition'>pUnbox</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span>
<a name="line-106"></a><a name="castFastPtr"></a><span class='hs-definition'>castFastPtr</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span>
<a name="line-107"></a>
<a name="line-108"></a><span class='hs-cpp'>#else /* ! __GLASGOW_HASKELL__ */</span>
<a name="line-109"></a>
<a name="line-110"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>ord</span><span class='hs-layout'>,</span> <span class='hs-varid'>chr</span><span class='hs-layout'>)</span>
<a name="line-111"></a>
<a name="line-112"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</span>
<a name="line-113"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word</span><span class='hs-layout'>)</span> <span class='hs-comment'>--is it a good idea to assume this exists too?</span>
<a name="line-114"></a><span class='hs-comment'>--does anyone need shiftRLFastInt? (apparently yes.)</span>
<a name="line-115"></a>
<a name="line-116"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Ptr</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="FastInt"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-119"></a><span class='hs-sel'>_ILIT</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-120"></a><span class='hs-definition'>iBox</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-121"></a><span class='hs-definition'>iUnbox</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-122"></a><a name="+#"></a><span class='hs-layout'>(</span><span class='hs-varop'>+#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span>
<a name="line-123"></a><a name="-#"></a><span class='hs-layout'>(</span><span class='hs-varop'>-#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>)</span>
<a name="line-124"></a><a name="*#"></a><span class='hs-layout'>(</span><span class='hs-varop'>*#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>*</span><span class='hs-layout'>)</span>
<a name="line-125"></a><span class='hs-definition'>quotFastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>quot</span>
<a name="line-126"></a><span class='hs-comment'>--quotRemFastInt = quotRem</span>
<a name="line-127"></a><span class='hs-definition'>negateFastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>negate</span>
<a name="line-128"></a><a name="==#"></a><span class='hs-layout'>(</span><span class='hs-varop'>==#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span>
<a name="line-129"></a><a name="/=#"></a><span class='hs-layout'>(</span><span class='hs-varop'>/=#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-layout'>)</span>
<a name="line-130"></a><a name="<#"></a><span class='hs-layout'>(</span><span class='hs-varop'><#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'><</span><span class='hs-layout'>)</span>
<a name="line-131"></a><a name="<=#"></a><span class='hs-layout'>(</span><span class='hs-varop'><=#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'><=</span><span class='hs-layout'>)</span>
<a name="line-132"></a><a name=">=#"></a><span class='hs-layout'>(</span><span class='hs-varop'>>=#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>>=</span><span class='hs-layout'>)</span>
<a name="line-133"></a><a name=">#"></a><span class='hs-layout'>(</span><span class='hs-varop'>>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>></span><span class='hs-layout'>)</span>
<a name="line-134"></a><span class='hs-definition'>shiftLFastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shiftL</span>
<a name="line-135"></a><span class='hs-definition'>shiftR_FastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shiftR</span>
<a name="line-136"></a><span class='hs-definition'>shiftRAFastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shiftR</span>
<a name="line-137"></a><span class='hs-definition'>shiftRLFastInt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>shiftR</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word</span><span class='hs-layout'>)</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-138"></a><span class='hs-comment'>--shiftLFastInt n p = n * (2 ^ p)</span>
<a name="line-139"></a><span class='hs-comment'>--assuming quot-Int is faster and the</span>
<a name="line-140"></a><span class='hs-comment'>--same for nonnegative arguments than div-Int</span>
<a name="line-141"></a><span class='hs-comment'>--shiftR_FastInt n p = n `quot` (2 ^ p)</span>
<a name="line-142"></a><span class='hs-comment'>--shiftRAFastInt n p = n `div` (2 ^ p)</span>
<a name="line-143"></a><span class='hs-comment'>--I couldn't figure out how to implement without Word nor Bits</span>
<a name="line-144"></a><span class='hs-comment'>--shiftRLFastInt n p = fromIntegral ((fromIntegral n :: Word) `quot` (2 ^ (fromIntegral p :: Word)))</span>
<a name="line-145"></a>
<a name="line-146"></a><span class='hs-definition'>bitAndFastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>.&.</span><span class='hs-layout'>)</span>
<a name="line-147"></a><span class='hs-definition'>bitOrFastInt</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>.|.</span><span class='hs-layout'>)</span>
<a name="line-148"></a>
<a name="line-149"></a><a name="FastBool"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>FastBool</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Bool</span>
<a name="line-150"></a><a name="fastBool"></a><span class='hs-definition'>fastBool</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-151"></a><a name="isFastTrue"></a><span class='hs-definition'>isFastTrue</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-152"></a><a name="fastOr"></a><span class='hs-comment'>-- make sure these are as strict as the unboxed version,</span>
<a name="line-153"></a><span class='hs-comment'>-- so that the performance characteristics match</span>
<a name="line-154"></a><span class='hs-definition'>fastOr</span> <span class='hs-conid'>False</span> <span class='hs-conid'>False</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-155"></a><span class='hs-definition'>fastOr</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-156"></a><a name="fastAnd"></a><span class='hs-definition'>fastAnd</span> <span class='hs-conid'>True</span> <span class='hs-conid'>True</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-157"></a><span class='hs-definition'>fastAnd</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-158"></a>
<a name="line-159"></a><a name="FastChar"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>FastChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Char</span>
<a name="line-160"></a><span class='hs-sel'>_CLIT</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-161"></a><span class='hs-definition'>cBox</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-162"></a><span class='hs-definition'>cUnbox</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-163"></a><span class='hs-definition'>fastOrd</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ord</span>
<a name="line-164"></a><span class='hs-definition'>fastChr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>chr</span> <span class='hs-comment'>--or unsafeChr if there was a standard location for it</span>
<a name="line-165"></a><span class='hs-definition'>eqFastChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span>
<a name="line-166"></a>
<a name="line-167"></a><a name="FastPtr"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>FastPtr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>a</span>
<a name="line-168"></a><span class='hs-definition'>pBox</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span>
<a name="line-169"></a><span class='hs-definition'>pUnbox</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span>
<a name="line-170"></a><span class='hs-definition'>castFastPtr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>castPtr</span>
<a name="line-171"></a>
<a name="line-172"></a><span class='hs-comment'>--These are among the type-signatures necessary for !ghc to compile</span>
<a name="line-173"></a><span class='hs-comment'>-- but break ghc (can't give a signature for an import...)</span>
<a name="line-174"></a><span class='hs-comment'>--Note that the comparisons actually do return Bools not FastBools.</span>
<a name="line-175"></a><span class='hs-layout'>(</span><span class='hs-varop'>+#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>-#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>*#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-176"></a><span class='hs-layout'>(</span><span class='hs-varop'>==#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><=#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>=#</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-177"></a>
<a name="line-178"></a><span class='hs-cpp'>#endif /* ! __GLASGOW_HASKELL__ */</span>
<a name="line-179"></a>
<a name="line-180"></a><a name="minFastInt"></a><span class='hs-definition'>minFastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>maxFastInt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-181"></a><span class='hs-definition'>minFastInt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-varop'><#</span> <span class='hs-varid'>y</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>y</span>
<a name="line-182"></a><a name="maxFastInt"></a><span class='hs-definition'>maxFastInt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-varop'><#</span> <span class='hs-varid'>y</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>y</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>x</span>
<a name="line-183"></a>
<a name="line-184"></a><span class='hs-comment'>-- type-signatures will improve the non-ghc-specific versions</span>
<a name="line-185"></a><span class='hs-comment'>-- and keep things accurate (and ABLE to compile!)</span>
<a name="line-186"></a><span class='hs-sel'>_ILIT</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-187"></a><span class='hs-definition'>iBox</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-188"></a><span class='hs-definition'>iUnbox</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-189"></a>
<a name="line-190"></a><span class='hs-definition'>quotFastInt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-191"></a><span class='hs-definition'>negateFastInt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-192"></a><span class='hs-definition'>shiftLFastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>shiftR_FastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>shiftRAFastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>shiftRLFastInt</span>
<a name="line-193"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-194"></a><span class='hs-definition'>bitAndFastInt</span><span class='hs-layout'>,</span> <span class='hs-varid'>bitOrFastInt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-195"></a>
<a name="line-196"></a><span class='hs-sel'>_CLIT</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastChar</span>
<a name="line-197"></a><span class='hs-definition'>cBox</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastChar</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-198"></a><span class='hs-definition'>cUnbox</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastChar</span>
<a name="line-199"></a><span class='hs-definition'>fastOrd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastChar</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastInt</span>
<a name="line-200"></a><span class='hs-definition'>fastChr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastChar</span>
<a name="line-201"></a><span class='hs-definition'>eqFastChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastChar</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastChar</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-202"></a>
<a name="line-203"></a><span class='hs-definition'>pBox</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastPtr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>a</span>
<a name="line-204"></a><span class='hs-definition'>pUnbox</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastPtr</span> <span class='hs-varid'>a</span>
<a name="line-205"></a><span class='hs-definition'>castFastPtr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FastPtr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FastPtr</span> <span class='hs-varid'>b</span>
<a name="line-206"></a>
</pre>\end{code}
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