Index mapping: Difference between revisions

Revision as of 00:59, 29 April 2020

Revision as of 17:56, 11 May 2020

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Roger Sayle gives an example<ref>{{cite journal|last1=Sayle|first1=Roger Anthony|title=A Superoptimizer Analysis of Multiway Branch Code Generation|journal=Proceedings of the GCC Developers' Summit|date=June 17, 2008|pages=103–116|url=https://www.nextmovesoftware.com/technology/SwitchOptimization.pdf|accessdate=26 November 2015}}</ref> of eliminating a [[multiway branch]] caused by a [[switch statement]]:

<sourcesyntaxhighlight lang="c++">

inline bool HasOnly30Days(int m)

{

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}

}

</syntaxhighlight>

</source>

Which can be replaced with a table lookup:

<sourcesyntaxhighlight lang="c++">

inline bool HasOnly30Days(int m)

{

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return T[m-1];

}

</syntaxhighlight>

</source>

==See also==