style/efficiency question

style/efficiency question

[W. Wesley Groleau x4923]

Does anyone have a clear recent (1992 or later) example of a situation
where it was not possible to generate a CASE statement that was more
efficient than an IF/THEN/ELSIF/... ?

Don't bother with examples of CASE that are more efficient--almost
everyone knows these exist.

-- 
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    Wes Groleau, Hughes Defense Communications, Fort Wayne, IN USA
Senior Software Engineer - AFATDS                  Tool-smith Wanna-be
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Re: style/efficiency question

[Stephen Leake]

W. Wesley Groleau x4923 wrote:
> 
> Does anyone have a clear recent (1992 or later) example of a situation
> where it was not possible to generate a CASE statement that was more
> efficient than an IF/THEN/ELSIF/... ?

Do you mean time efficient or space efficient? 

gcc uses if/then/else for case statements with small numbers of choices.

Certainly if there are only two cases, an if/then/else is likely to be
both more efficient in both time and space.

If the case choices are sparsely distributed, you either build a big
sparse jump table (space inefficient), or use a compressed table of some
sort (time inefficient). 

-- 
- Stephe