Does MSVC c++ compiler convert a switch statement to a lookup table to improve efficiency?

Asked Dec 19 '19 at 22:49

Active Dec 19 '19 at 23:37

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Does MSVC compiler (Microsoft Visual Studio) does any optimization such as converting to a look-up or hash table for switch-case statements?

edited Dec 19 '19 at 23:37

Nicol Bolas

asked Dec 19 '19 at 22:49

A. Mashreghi

https://learn.microsoft.com/en-us/cpp/build/reference/fa-fa-listing-file?view=vs-2019 – Hans Passant Dec 19 '19 at 23:14
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I would be shocked and awed if it didn't – Mooing Duck Dec 19 '19 at 23:43
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As someone who has had to decompile VS generated code I can assure you it does do switch tables and other optimisations such as 2 level switch tables, etc. – Mike Vine Dec 19 '19 at 23:47
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https://gcc.godbolt.org/z/EDNynm – Raymond Chen Dec 20 '19 at 00:48
yes of course. It can also [generate a bit lookup table](https://stackoverflow.com/q/26124620/995714) – phuclv Dec 06 '22 at 16:44

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