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Re: Using __builtin_expect (likely/unlikely macros)

From: Paul Eggert
Subject: Re: Using __builtin_expect (likely/unlikely macros)
Date: Sat, 20 Apr 2019 09:11:30 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

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>.

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.

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