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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Q: What is default architecture for code produced by native
 compiler?
Date: Thu, 26 Aug 2021 09:57:38 +0300
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To: Arthur Miller <arthur.miller@live.com>
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 (message from Arthur Miller on Thu, 26 Aug 2021 01:26:30 +0200)
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> From: Arthur Miller <arthur.miller@live.com>
> Cc: akrl@sdf.org,  emacs-devel@gnu.org
> Date: Thu, 26 Aug 2021 01:26:30 +0200
> 
> > I'm also curious why you want to mess with that.  Do you use the
> > equivalent GCC switches when compiling Emacs?  If so, why?
> Yes, I do, I compile Emacs with -O3 -march=native and -mcpu=native
> 
> Hopefully gcc will emit some AVX instructions where possible. I haven't
> dissasembled Emacs binary so I don't know how big is difference between generic
> and native.

Well, I suggest that you do look into the differences between the
produced code, and try to measure the effect on the speed of Emacs.

Btw, -O3 is not recommended, as it frequently produces a slower Emacs.