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Date: Wed, 14 Feb 2024 09:03:21 -0500
From: Rich Felker <>
To: Thorsten Glaser <>
Subject: Re: PAC/BTI Support on aarch64

On Wed, Feb 14, 2024 at 01:32:13PM +0000, Thorsten Glaser wrote:
> Markus Wichmann dixit:
> >According to Intel, the ENDBR64 instruction decodes as NOP on older
> >processors.
> That’s unfortunately only true for processors manufactored by Intel.
> There exist 686-class CPUs that don’t handle these and other long nops
> so it’s best omitted on generic, as in not -march=native, builds.

Lovely. So yet another reason the Intel thing sounds unusable in
practice while the ARM thing seems very reasonable to support...

Since you mentioned 686-class which are 32-bit, is the same true for
x86_64, or is the situation better there?


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