From: Florian Weimer <fweimer@redhat.com>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org, gcc@gcc.gnu.org,
libc-alpha@sourceware.org, Paul E Murphy <murphyp@linux.ibm.com>
Subject: Re: [PATCH Linux] powerpc: add documentation for HWCAPs
Date: Tue, 24 May 2022 11:52:00 +0200 [thread overview]
Message-ID: <87ee0juukf.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <20220524093828.505575-1-npiggin@gmail.com> (Nicholas Piggin's message of "Tue, 24 May 2022 19:38:28 +1000")
* Nicholas Piggin:
> +2. Facilities
> +-------------
> +The Power ISA uses the term "facility" to describe a class of instructions,
> +registers, interrupts, etc. The presence or absence of a facility indicates
> +whether this class is available to be used, but the specifics depend on the
> +ISA version. For example, if the VSX facility is available, the VSX
> +instructions that can be used differ between the v3.0B and v3.1B ISA
> +verstions.
The 2.07 ISA manual also has categories. ISA 3.0 made a lot of things
mandatory. It may make sense to clarify that feature bits for mandatory
aspects of the ISA are still set, to help with backwards compatibility.
Thanks,
Florian
next prev parent reply other threads:[~2022-05-24 9:52 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-24 9:38 Nicholas Piggin
2022-05-24 9:52 ` Florian Weimer [this message]
2022-05-24 18:32 ` Segher Boessenkool
2022-07-15 1:17 ` Nicholas Piggin
2022-07-15 14:35 ` Segher Boessenkool
2022-05-24 17:38 ` Segher Boessenkool
2022-07-15 1:00 ` Nicholas Piggin
2023-06-06 14:49 ` Passing the complex args in the GPR's Umesh Kalappa
2023-06-06 14:58 ` Andrew Pinski
2023-06-06 15:05 ` Umesh Kalappa
2023-06-06 15:16 ` Andrew Pinski
2023-06-06 16:42 ` Segher Boessenkool
2023-06-06 17:07 ` Umesh Kalappa
2023-06-06 17:33 ` David Edelsohn
2023-06-07 13:17 ` Michael Matz
2023-06-06 17:18 ` Joseph Myers
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