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From: Ulrich Drepper <drepper@gmail.com>
Date: Wed, 20 Apr 2016 14:25:00 -0000
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Subject: Re: Library auditing interface stability?
To: "Carlos O'Donell" <carlos@redhat.com>
Cc: GNU C Library <libc-alpha@sourceware.org>
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On Tue, Apr 19, 2016 at 5:03 PM, Carlos O'Donell <carlos@redhat.com> wrote:
> In particular the La_*_regs and La_*_retval which contains
> additional registers as we expand the supported ISAs.

la_version is there to preserve unlimited backward compatibility.