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1、MattersComputationalideas,algorithms,sourcecodeThisdocumentisworkinprogress:readtheimportantremarks"nearthebeginningJ?orgArndtarndt@jjj.de1Draftversionof2009-May-111Thelatestversionandtheaccompanyingsoftwareisonlineathttp://www.jjj.de/fxt/.ii[fxtbookdraftof2009-May-11]CONTENTSiiiContentsPrefac
2、exiILowlevelalgorithms11Bitwizardry31.1Trivia...............................................31.2Operationsonindividualbits..................................81.3Operationsonlowbitsorblocksofaword..........................91.4Extractionofones,zeros,orblocksneartransitions.....................121.
3、5Computingtheindexofasinglesetbit............................141.6Operationsonhighbitsorblocksofaword..........................161.7Functionsrelatedtothebase-2logarithm...........................181.8Countingthebitsandblocksofaword............................191.9Wordsasbitsets.................
4、........................241.10Avoidingbranches........................................251.11Bit-wiserotationofaword...................................281.12Binarynecklacesz........................................291.13Reversingthebitsofaword..................................341.14Bit-wisezip...
5、.........................................381.15Graycodeandparity......................................411.16Bitsequencyz..........................................471.17PowersoftheGraycodez...................................491.18Invertibletransformsonwordsz................................501.19
6、Space llingcurves........................................571.20Scanningforzerobytes.....................................661.212-adicinverseandsquareroot.................................691.22Radix
