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Re: User directed Function Multiversioning (MV) via Function Overloading

From: Andi Kleen <andi at firstfloor dot org>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: Sriraman Tallam <tmsriram at google dot com>, gcc at gcc dot gnu dot org, Xinliang David Li <davidxl at google dot com>
Date: Wed, 07 Mar 2012 07:39:54 -0800
Subject: Re: User directed Function Multiversioning (MV) via Function Overloading
References: <CAAs8HmzhXa9WrJt7To=UCGM_aCFmY0F2XFKkTLVt8UogX0hs2g@mail.gmail.com> <CAFiYyc2y723JNi9e77s3dhbMP6VC50Px354aGQe1w459jUoV5Q@mail.gmail.com>

Richard Guenther <richard.guenther@gmail.com> writes:
>
> I don't like specifying 'arch' at all.  Instead you _always_ want architecture
> feature tests, not architecture tests.  Because, does amdfam10 also cover
> bdver1?  [it can't! bdver1 does no longer have 3dnow! but that's entirely
> surprising for a user]

There's still a case for checking for specific models: some micro
architectures prefer specific code paths over others, without
necessarily using special features.

-Andi
-- 
ak@linux.intel.com -- Speaking for myself only

References:
- User directed Function Multiversioning (MV) via Function Overloading
  - From: Sriraman Tallam
- Re: User directed Function Multiversioning (MV) via Function Overloading
  - From: Richard Guenther

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