From: Richard Henderson <rth@redhat.com>
To: harsha.jagasia@amd.com
Cc: gcc-patches@gcc.gnu.org, hubicka@ucw.cz, ubizjak@gmail.com,
hjl.tools@gmail.com, Changpeng.Fang@amd.com
Subject: Re: AVX generic mode tuning discussion.
Date: Tue, 12 Jul 2011 22:29:00 -0000 [thread overview]
Message-ID: <4E1CC32B.3060004@redhat.com> (raw)
In-Reply-To: <20110712212201.23194.45716.sendpatchset@gccpike4.amd.com>
On 07/12/2011 02:22 PM, harsha.jagasia@amd.com wrote:
> We would like to propose changing AVX generic mode tuning to generate 128-bit
> AVX instead of 256-bit AVX.
You indicate a 3% reduction on bulldozer with avx256.
How does avx128 compare to -mno-avx -msse4.2?
Will the next AMD generation have a useable avx256?
I'm not keen on the idea of generic mode being tune
for a single processor revision that maybe shouldn't
actually be using avx at all.
r~
next prev parent reply other threads:[~2011-07-12 21:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-12 22:26 harsha.jagasia
2011-07-12 22:29 ` Richard Henderson [this message]
2011-07-13 8:49 ` Richard Guenther
2011-07-13 9:07 ` Jakub Jelinek
2011-07-21 21:37 ` Jagasia, Harsha
2013-01-07 18:24 ` FW: " Jagasia, Harsha
[not found] ` <873A3B0C5474B84F92B91855BCB4FE1625438297@sausexdag01.amd.com>
2013-01-08 11:22 ` Richard Biener
2011-07-21 21:18 ` Jagasia, Harsha
[not found] ` <63EE40A00BA43F49B85FACBB03F078B60821086630@sausexmbp02.amd.com>
2011-10-31 21:21 ` Jagasia, Harsha
2011-11-01 9:47 ` Richard Guenther
2011-11-02 17:17 ` Jagasia, Harsha
2011-11-02 20:50 ` Richard Guenther
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