From: Alexander Monakov <amonakov@ispras.ru>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH v2] x86-64: Optimize strcmp/wcscmp with AVX2
Date: Fri, 01 Jun 2018 15:30:00 -0000 [thread overview]
Message-ID: <alpine.LNX.2.20.13.1806011824140.1892@monopod.intra.ispras.ru> (raw)
In-Reply-To: <CAMe9rOpKpR6pOLkxyMuTPBA1zSx4MmYYsTOwHz5pTxjdR57p1A@mail.gmail.com>
On Fri, 1 Jun 2018, H.J. Lu wrote:
> Please mention strncmp and wcsncmp in commit subject. OK with this
> change.
Many Intel CPUs reduce operating frequency upon encountering AVX code,
and some have a "spin-up" period when frequency is not yet changed and
AVX code runs at reduced throughput. Thus, why is this change not
detrimental in practice, doesn't it slow down all code (including other
programs running on the same core) as soon as a program makes a call to strcmp?
Alexander
next prev parent reply other threads:[~2018-06-01 15:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-29 18:53 leonardo.sandoval.gonzalez
2018-06-01 14:46 ` H.J. Lu
2018-06-01 15:30 ` Alexander Monakov [this message]
2018-06-01 20:23 ` Leonardo Sandoval
2018-06-02 7:46 ` Alexander Monakov
2018-06-02 11:37 ` Florian Weimer
2018-06-04 14:14 ` Leonardo Sandoval
2018-06-05 10:14 ` Alexander Monakov
2018-06-05 14:02 ` Leonardo Sandoval
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