编译器keil的优化选项针对arm

《编译器keil的优化选项针对arm》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、编译器_keil的优化选项问题分类： 编译器类2013-01-1114:12 280人阅读 评论(0) 收藏 举报applicationApplicationcompilationcompileroptimizationperformancePerformance最近发现在keil编译的时候，出现莫名的问题，貌似代码有被优化掉的问题，后来查了下相关的资料，貌似懂了点。我选择的是默认的default优化方式，上网看了下，默认的是level2级别优化，最后选择level0就没有问题了下面是网上找的资料，介绍了优化功能介绍Get

2、tingtheBestOptimizedCodeforyourEmbeddedApplication ARMCompilationTools TheARMCompilationToolsaretheonlycompilationtoolsco-developedwiththeARMprocessors,andspecifically designedtooptimallysupporttheARMarchitecture.Theyarearesultof20yearsofdevelopment,andarerecogniz

3、edasthe industry-leadingCandC++compilationtoolsfortheARM,Thumb,andThumb-2instructionssets. TheARMCompilationtoolsconsistof: • TheARMCompiler,whichenablesyoutocompileCandC++code.Itisanoptimizingcompiler,andfeatures command-lineoptionstoenableyoutocontrolthelevelofo

4、ptimization • LinkerandUtilities,whichassignaddressesandlayoutsectionsofcodetoformafinalimage • Aselectionoflibraries,includingtheISOstandardClibraries,andtheMicroLIBClibrarywhichisoptimizedfor embeddedapplications • Assembler,whichgeneratesmachinecodeinstructions

5、from ARM,ThumborThumb-2assembly-level sourcecode  CompilerOptionsforEmbeddedApplications  TheARMCompilationToolsincludeanumberofcompileroptimizationstohelpyoubesttargetyourcodeforyourchosen microcontrollerdeviceand applicationarea.  TheycanbeaccessedfromwithinµVis

6、ionbyclickingonProject– OptionsforTarget. Theoptionsdescribedthisdocument canbefoundontheTarget and C/C++ tabs of the OptionsforTargets dialog.  MDKCompilerOptimizations  • Cross-Module Optimization takesinformationfromapriorbuildandusesittoplaceUNUSEDfunctionsint

7、otheir ownELFsectioninthecorrespondingobjectfile.ThisoptionisalsoknownasLinkerFeedback,andrequiresyouto buildyourapplicationtwicetotakeadvantageofitforreducedcodesize.  Cross-ModuleOptimizationhasbeenshowntoreducecodesize,byremovingunusedfunctionsfromyourapplicati

8、on.It canalsoimprovetheperformance ofyourapplication,byallowingmodulestoshareinlinecode.  • The MicroLIB Clibrary hasbeenoptimizedtoreducethesizeofembed