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List:       kde-multimedia
Subject:    Re: configure check for SSE support in the assembler (#29700)
From:       Charles Samuels <charles () kde ! org>
Date:       2001-07-27 16:03:20
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On Friday 27 July 2001 08:21 am, Malte Starostik wrote:

> On Freitag, 27. Juli 2001 17:07, Charles Samuels wrote:
> > On Friday 27 July 2001 07:56 am, Malte Starostik wrote:
> > > On Freitag, 27. Juli 2001 16:17, Charles Samuels wrote:
> > > > On Friday 27 July 2001 05:52 am, Malte Starostik wrote:
> > > > > Please review, if it's okay, I'll do the same for kdemultimedia and
> > > > > where it's used in noatun etc.
> > > >
> > > > What's this for? I thought the whole reason we had the runtime check
> > > > was so that SSE would always be used, even if the user is using
> > > > binaries compiled on a non-sse system..?
> > >
> > > There seem to be quite a few users with old GNU as that doesn't
> > > understand those opcodes regardless of what the hardware supports. They
> > > simply get compile errors now...
> >
> > Is this a workaround for _that_ problem, or are you only allowing it on
> > SSE systems?  Perhaps a --disable-sse option or something of the likes?
>
> All it does is to #define HAVE_X86_SSE according to whether the assembler
> groks SSE insns. The symbol will still be defined if the build machine is a
> 386, and the actual use of SSE is left to the runtime check.
> If the CPU and kernel can use it is not subject of this test, it's just to
> avoid compile errors on setups with an old assembler. I even had a report
> from a gcc 3.0 user who got
Ok.  then I approve :)

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