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Re: [i386, patch, RFC] HLE support in GCC

From: Andi Kleen <andi at firstfloor dot org>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: Andi Kleen <andi at firstfloor dot org>, Kirill Yukhin <kirill dot yukhin at gmail dot com>, Jakub Jelinek <jakub at redhat dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Tue, 10 Apr 2012 22:20:20 +0200
Subject: Re: [i386, patch, RFC] HLE support in GCC
References: <CAGs3Rfu6kiQhDPXy_QmEyKzs-FXPO9i74VUEUPoHX0WiEaz_iA@mail.gmail.com> <20120307111008.GK16117@tyan-ft48-01.lab.bos.redhat.com> <CAMe9rOqC1fckmVN9MOXWMhG-2jhHYtGCsrXCdT4ZDgp1J39Msw@mail.gmail.com> <CAGs3Rft_0Cs6v3AP_LH2tbbqrym5rf1A4MJ+6fn1T37=BEzrbw@mail.gmail.com> <CAMe9rOqKWyfumpjuLyNGwAxdfzU9XmMDcj0vq4t1CefKJZtg5w@mail.gmail.com> <20120308150912.GS16117@tyan-ft48-01.lab.bos.redhat.com> <CAGs3RftVUdWy=jqfonJFLsyuT6mWjm_0Bdc2Dqjgtd9qNGDRXA@mail.gmail.com> <CAMe9rOrw5mNk=0NX3C74x4v1yEFy7VMTex6QDTEvE1UX+E6P4w@mail.gmail.com> <m2d37f1r6g.fsf@firstfloor.org> <CAMe9rOrW58bXLZJ5SyvAevKTURikTxz=2eYxDq98sbV6iF4ENg@mail.gmail.com>

> If it is the case, can we generate HLE RELEASE/ACQUIRE
> prefix automatically for C++ atomics via -mhle command line option.
> Then you don't need to modify the source codes to enable HLE support.

No, for HLE someone needs to decide whether HLE is beneficial for a given
lock.  There are cases where it is not or even wrong (e.g. if there is no
matching unlock)

-Andi

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

Follow-Ups:
- Re: [i386, patch, RFC] HLE support in GCC
  - From: Kirill Yukhin

References:
- Re: [i386, patch, RFC] HLE support in GCC
  - From: Kirill Yukhin
- Re: [i386, patch, RFC] HLE support in GCC
  - From: H.J. Lu
- Re: [i386, patch, RFC] HLE support in GCC
  - From: Andi Kleen
- Re: [i386, patch, RFC] HLE support in GCC
  - From: H.J. Lu

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