Date: Sun, 15 Dec 2019 16:51:27 -0500 From: Jeffrey Walton <noloader@...il.com> To: musl@...ts.openwall.com Subject: Re: max_align_t mess on i386 On Sun, Dec 15, 2019 at 3:03 PM Alexander Monakov <amonakov@...ras.ru> 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, https://releases.llvm.org/6.0.0/tools/clang/docs/HardwareAssistedAddressSanitizerDesign.html and https://bugzilla.mozilla.org/show_bug.cgi?id=1143022 . Jeff
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