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Date: Sun, 15 Dec 2019 16:51:27 -0500
From: Jeffrey Walton <>
Subject: Re: max_align_t mess on i386

On Sun, Dec 15, 2019 at 3:03 PM Alexander Monakov <> wrote:
> ...
> [SNIP] Which makes those bit positions available for flags
> associated with the pointer, if you can arrange for them to be masked off
> to use the pointer itself.

Be careful of those tricks. I believe they are called Tagged Pointers.

Aarch64 was doing it for a while. It caused a lot of problems in
practice. It was breaking diagnostic tools. It was also holding up the
porting of some libraries.

See, for example,
and .


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