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Re: Using __builtin_expect (likely/unlikely macros)

From: Eli Zaretskii
Subject: Re: Using __builtin_expect (likely/unlikely macros)
Date: Sat, 20 Apr 2019 19:18:49 +0300

> Cc: address@hidden, address@hidden
> From: Paul Eggert <address@hidden>
> Date: Sat, 20 Apr 2019 09:11:30 -0700
> Eli Zaretskii wrote:
> > I consider 1.3% performance improvement as insignificant for all
> > practical purposes.
> When I'm talking about performance measurements I try to use the word 
> "significant" in its usual scientific sense 
> <https://en.wikipedia.org/wiki/Statistical_significance>.

Of course.  I didn't mean to imply that the improvement was
insignificant statistically, only that it's insignificant in practice.

> Agreed that 1.3% is no big deal by itself, but if one can make a series of 
> 1.3% 
> performance improvements that build on each other, their effects multiply and 
> the overall effort has worthwhile practical benefits.

Sure, but the effect on code readability also multiplies, right?

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