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Re: commit "Request is_utf8_char_slow() be inlined" has no message

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November 25, 2012 08:24
Re: commit "Request is_utf8_char_slow() be inlined" has no message
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Karl Williamson wrote:
> On 11/25/2012 07:30 AM, bulk88 wrote:
>> why? There is no commit message. How did you come to that decision?
> I did not expand on the commit's subject line, because when it came to 
> write it, I couldn't think of anything that wasn't effectively just a 
> repeat of the subject line.
> Perhaps I made the wrong decision.  In looking at it today, I think I 
> could have added the adjective "wrapper function" to it to make it clear 
> that there is no real meat in the to-be-inlined function.
> I presumed that the audience would know that inlining speeds things up 
> by avoiding function call overhead, and hence in general is a "good" 
> thing.  And I presumed that they knew that the downside of inlining is 
> expansion of the memory occupied by the program.  And so, it would have 
> been better to alleviate that concern by mentioning that the affected 
> function is just a wrapper, and hence its inlining doesn't appreciably 
> change the size of the code.

What is your cost benefit cutoff for inlining?

Is S_is_utf8_char_slow unconditionally called? Is S_is_utf8_char_slow 
hot (profiler or benchmark or educated guess or experience)? Was it used 
in so few places (I counted 3) the overhead of the call would exceed 
inlining it?

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