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From: "rearnsha at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113257] -march=native or -mcpu=native are ineffective,
 but -march=native -mcpu=native works on arm64 M2 Ultra
Date: Mon, 08 Jan 2024 10:49:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113257

--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
For -mcpu=3Dnative, the manual says:

Additionally on native AArch64 GNU/Linux systems the value
@samp{native} tunes performance to the host system.  This option has no eff=
ect
if the compiler is unable to recognize the processor of the host system.

With similar working for -march=3Dnative

Since nobody has contributed patches to recognize the Apple Silicon cores, I
suspect that is the source of the problem.=