From: Tulio Magno Quites Machado Filho <tuliom@ascii.art.br>
To: Florian Weimer <fweimer@redhat.com>,
Paul Zimmermann <Paul.Zimmermann@inria.fr>
Cc: libc-alpha@sourceware.org
Subject: Re: use of fma
Date: Wed, 28 Apr 2021 12:00:29 -0300 [thread overview]
Message-ID: <87im46zc6q.fsf@linux.ibm.com> (raw)
In-Reply-To: <87sg3ake7i.fsf@oldenburg.str.redhat.com>
Florian Weimer via Libc-alpha <libc-alpha@sourceware.org> writes:
> * Paul Zimmermann:
>
>> However, on PowerPC __FP_FAST_FMA is defined without -march=native:
>>
>> pzimmermann@drac-12:~$ gcc -O2 -g -dM -E -xc /dev/null | grep -q __FP_FAST_FMA
>> pzimmermann@drac-12:~$ echo $?
>> 0
>
> I assume that this is powerpc64le, which has a POWER8 baseline. The
> switch to little endian neatly eliminated requirements for backwards
> compatibility.
Side note: single and double-precision multiply-add have been available since
the PPC ISA and POWER1 ISA respectively.
So, they're also available by default on powerpc64 and powerpc builds
supporting hw fpu.
--
Tulio Magno
next prev parent reply other threads:[~2021-04-28 15:18 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-28 7:23 Paul Zimmermann
2021-04-28 8:25 ` Florian Weimer
2021-04-28 8:42 ` Paul Zimmermann
2021-04-28 9:06 ` Florian Weimer
2021-04-28 17:29 ` Joseph Myers
2021-04-28 15:00 ` Tulio Magno Quites Machado Filho [this message]
2021-04-28 15:18 ` Paul Zimmermann
2021-04-28 15:45 ` Tulio Magno Quites Machado Filho
2021-04-28 17:46 ` Joseph Myers
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