Re: [BK+PATCH] remove __constant_memcpy

From: Arjan van de Ven (arjanv@redhat.com)
Date: Thu Apr 17 2003 - 03:46:47 EST

On Thu, 2003-04-17 at 04:06, Linus Torvalds wrote:
> On Wed, 16 Apr 2003, Jeff Garzik wrote:
> >
> > gcc's __builtin_memcpy performs the same function (and more) as the
> > kernel's __constant_memcpy. So, let's remove __constant_memcpy, and let
> > the compiler do it.
>
> Please don't.
>
> There's no way gcc will EVER get the SSE2 cases right. It just cannot do
> it. In fact, I live in fear that we will have to turn off the compiler
> intrisics entirely some day just because there is always the worry that
> gcc will start using FP.

it can do that ANYWAY for all kinds of things.
We really should ask the gcc folks to add a
-fdontyoudareusefloatingpoint flag (well different name probably) to
make sure it never ever will generate FP code. (would also help catch
abusers of FP code in the kernel as a bonus ;)


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