From: Andi Kleen <andi@firstfloor.org>
To: Roel Kluin <roel.kluin@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>,
"David S. Miller" <davem@davemloft.net>,
Mikael Pettersson <mikpe@it.uu.se>,
penberg@cs.helsinki.fi, Brian Gerst <brgerst@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-crypto@vger.kernel.org, Herbert@gondor.apana.org.au
Subject: Re: [PATCH v2] compiler: prevent dead store elimination
Date: Tue, 2 Mar 2010 13:24:22 +0100 [thread overview]
Message-ID: <20100302122421.GB19208@basil.fritz.box> (raw)
In-Reply-To: <4B8A8D17.2040208@gmail.com>
>
> >> +#define ARRAY_PREVENT_DSE(p, n)
> >
> > Who says the Intel compiler doesn't need this?
>
> There was a comment in include/linux/compiler-intel.h that it's not supported.
That's true for the ia64 version, but not for the x86 version which supports
gcc compatible inline assembler. So on x86 you can use it. On Itanium
it probably would need some other compiler built in.
Also in any case some form of memory clobber is needed because it'll surely
do dead-store-optimization.
-Andi
next prev parent reply other threads:[~2010-03-02 12:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-27 20:47 [PATCH v1] compiler: prevent dead store elimination Roel Kluin
2010-02-28 9:55 ` Andi Kleen
2010-02-28 15:34 ` [PATCH v2] " Roel Kluin
2010-03-01 9:29 ` Mikael Pettersson
2010-03-02 12:17 ` Andi Kleen
2010-03-03 23:16 ` [PATCH v3] " Roel Kluin
2010-03-02 12:24 ` Andi Kleen [this message]
2010-03-01 0:36 ` [PATCH v1] " Bill Davidsen
2010-03-01 5:15 ` Arjan van de Ven
2010-03-01 9:32 ` Mikael Pettersson
2010-03-01 9:33 ` Alexey Dobriyan
2010-03-01 22:27 ` Andi Kleen
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