On 7/20/05, Simon Strandman <[EMAIL PROTECTED]> wrote:
> Denis Vlasenko skrev:
>
> >
> >Why do you care? I bet that differences between i686 code and pentium4 code
> >are well below noise level.
> >--
> >vda
> >
> For x86_64 the flags -mno-sse -mno-mmx -mno-sse2 -mno-3dnow are always
> used for
Denis Vlasenko skrev:
On Wednesday 20 July 2005 12:25, Ivan Yosifov wrote:
Also, I believe that the -march=pentium4 option /was/ actually used up
until kernel 2.6.10 where it was dropped because of a risk that some
versions of gcc would cause the kernel to use SSE registers for data
On Wed, 2005-07-20 at 13:38 +0300, Denis Vlasenko wrote:
> On Wednesday 20 July 2005 12:25, Ivan Yosifov wrote:
> > > > > Also, I believe that the -march=pentium4 option /was/ actually used up
> > > > > until kernel 2.6.10 where it was dropped because of a risk that some
> > > > > versions of gcc
On Wednesday 20 July 2005 12:25, Ivan Yosifov wrote:
> > > > Also, I believe that the -march=pentium4 option /was/ actually used up
> > > > until kernel 2.6.10 where it was dropped because of a risk that some
> > > > versions of gcc would cause the kernel to use SSE registers for data
> > > >
>
>
> > > Also, I believe that the -march=pentium4 option /was/ actually used up
> > > until kernel 2.6.10 where it was dropped because of a risk that some
> > > versions of gcc would cause the kernel to use SSE registers for data
> > > movement (which is a no-no).
> > >
> >
> > You seem
>> https://www.redhat.com/archives/fedora-devel-list/2005-January/msg00742.html
>
>Interesting.
This may seem reasonable for a Linux distribution, but less for those who
compile kernelballs just for themselves.
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On Wed, 2005-07-20 at 11:23 +0300, Ivan Yosifov wrote:
> On Wed, 2005-07-20 at 09:03 +0100, Kerin Millar wrote:
> > On Tue, 19 Jul 2005 21:35:51 +0300, Ivan Yosifov wrote:
> >
> > Also, I believe that the -march=pentium4 option /was/ actually used up
> > until kernel 2.6.10 where it was
On Wed, 2005-07-20 at 09:03 +0100, Kerin Millar wrote:
> On Tue, 19 Jul 2005 21:35:51 +0300, Ivan Yosifov wrote:
>
>
>
> > -march implies -mtune and also implies thing like -msse2 for the
> > instruction set where applicable.
> > I think -march=pentium4 is equivalent to -mmmx -msse -msse2
> >
>Also, I believe that the -march=pentium4 option /was/ actually used up
>until kernel 2.6.10 where it was dropped because of a risk that some
>versions of gcc would cause the kernel to use SSE registers for data
>movement (which is a no-no).
In that case, -mno-sse should have been used.
Jan
On Tue, 19 Jul 2005 21:35:51 +0300, Ivan Yosifov wrote:
> -march implies -mtune and also implies thing like -msse2 for the
> instruction set where applicable.
> I think -march=pentium4 is equivalent to -mmmx -msse -msse2
> -mtune=pentium4 ( if I have not fogotten anything ).
> Pentium4
On Tue, 19 Jul 2005 21:35:51 +0300, Ivan Yosifov wrote:
snip
-march implies -mtune and also implies thing like -msse2 for the
instruction set where applicable.
I think -march=pentium4 is equivalent to -mmmx -msse -msse2
-mtune=pentium4 ( if I have not fogotten anything ).
Pentium4
Also, I believe that the -march=pentium4 option /was/ actually used up
until kernel 2.6.10 where it was dropped because of a risk that some
versions of gcc would cause the kernel to use SSE registers for data
movement (which is a no-no).
In that case, -mno-sse should have been used.
Jan
On Wed, 2005-07-20 at 09:03 +0100, Kerin Millar wrote:
On Tue, 19 Jul 2005 21:35:51 +0300, Ivan Yosifov wrote:
snip
-march implies -mtune and also implies thing like -msse2 for the
instruction set where applicable.
I think -march=pentium4 is equivalent to -mmmx -msse -msse2
On Wed, 2005-07-20 at 11:23 +0300, Ivan Yosifov wrote:
On Wed, 2005-07-20 at 09:03 +0100, Kerin Millar wrote:
On Tue, 19 Jul 2005 21:35:51 +0300, Ivan Yosifov wrote:
snip
Also, I believe that the -march=pentium4 option /was/ actually used up
until kernel 2.6.10 where it was dropped
https://www.redhat.com/archives/fedora-devel-list/2005-January/msg00742.html
Interesting.
This may seem reasonable for a Linux distribution, but less for those who
compile kernelballs just for themselves.
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To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of
snip
Also, I believe that the -march=pentium4 option /was/ actually used up
until kernel 2.6.10 where it was dropped because of a risk that some
versions of gcc would cause the kernel to use SSE registers for data
movement (which is a no-no).
You seem right. I fetched a
On Wednesday 20 July 2005 12:25, Ivan Yosifov wrote:
Also, I believe that the -march=pentium4 option /was/ actually used up
until kernel 2.6.10 where it was dropped because of a risk that some
versions of gcc would cause the kernel to use SSE registers for data
movement (which is a
On Wed, 2005-07-20 at 13:38 +0300, Denis Vlasenko wrote:
On Wednesday 20 July 2005 12:25, Ivan Yosifov wrote:
Also, I believe that the -march=pentium4 option /was/ actually used up
until kernel 2.6.10 where it was dropped because of a risk that some
versions of gcc would cause the
Denis Vlasenko skrev:
On Wednesday 20 July 2005 12:25, Ivan Yosifov wrote:
Also, I believe that the -march=pentium4 option /was/ actually used up
until kernel 2.6.10 where it was dropped because of a risk that some
versions of gcc would cause the kernel to use SSE registers for data
On 7/20/05, Simon Strandman [EMAIL PROTECTED] wrote:
Denis Vlasenko skrev:
Why do you care? I bet that differences between i686 code and pentium4 code
are well below noise level.
--
vda
For x86_64 the flags -mno-sse -mno-mmx -mno-sse2 -mno-3dnow are always
used for compilation. Why
On Tue, 2005-07-19 at 22:15 +0200, Jan Engelhardt wrote:
> >AFAIK it's not possible to use SSE and MME in kernel mode, since these
> >registers aren't preserved (it would be expensive).
>
> Floating point is anyway a no-no in the kernel.
However, there are a few exceptions like mmx_memcpy.
Lee
>AFAIK it's not possible to use SSE and MME in kernel mode, since these
>registers aren't preserved (it would be expensive).
Floating point is anyway a no-no in the kernel.
Jan Engelhardt
--
| Alphagate Systems, http://alphagate.hopto.org/
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Ivan Yosifov <[EMAIL PROTECTED]> wrote:
> -march implies -mtune and also implies thing like -msse2 for the
> instruction set where applicable.
> I think -march=pentium4 is equivalent to -mmmx -msse -msse2
> -mtune=pentium4 ( if I have not fogotten anything ).
> Pentium4 supports things like sse2
On Tue, 2005-07-19 at 19:52 +0200, Jan Engelhardt wrote:
> >Hello,
> >
> >If I set the CPU type to be amd64 in kernel config, the kernel is built
> >with -march=k8. If I set it to be k6, the kernel is built with
> >-march=k6. If I set the CPU type to be Pentium4, the kernel is built
> >with
>Hello,
>
>If I set the CPU type to be amd64 in kernel config, the kernel is built
>with -march=k8. If I set it to be k6, the kernel is built with
>-march=k6. If I set the CPU type to be Pentium4, the kernel is built
>with -march=i686 -mtune=pentium4. Why is not the for-P4 kernel built
>with
Hello,
If I set the CPU type to be amd64 in kernel config, the kernel is built
with -march=k8. If I set it to be k6, the kernel is built with
-march=k6. If I set the CPU type to be Pentium4, the kernel is built
with -march=i686 -mtune=pentium4. Why is not the for-P4 kernel built
with
Hello,
If I set the CPU type to be amd64 in kernel config, the kernel is built
with -march=k8. If I set it to be k6, the kernel is built with
-march=k6. If I set the CPU type to be Pentium4, the kernel is built
with -march=i686 -mtune=pentium4. Why is not the for-P4 kernel built
with
Hello,
If I set the CPU type to be amd64 in kernel config, the kernel is built
with -march=k8. If I set it to be k6, the kernel is built with
-march=k6. If I set the CPU type to be Pentium4, the kernel is built
with -march=i686 -mtune=pentium4. Why is not the for-P4 kernel built
with
On Tue, 2005-07-19 at 19:52 +0200, Jan Engelhardt wrote:
Hello,
If I set the CPU type to be amd64 in kernel config, the kernel is built
with -march=k8. If I set it to be k6, the kernel is built with
-march=k6. If I set the CPU type to be Pentium4, the kernel is built
with -march=i686
Ivan Yosifov [EMAIL PROTECTED] wrote:
-march implies -mtune and also implies thing like -msse2 for the
instruction set where applicable.
I think -march=pentium4 is equivalent to -mmmx -msse -msse2
-mtune=pentium4 ( if I have not fogotten anything ).
Pentium4 supports things like sse2 and mmx
AFAIK it's not possible to use SSE and MME in kernel mode, since these
registers aren't preserved (it would be expensive).
Floating point is anyway a no-no in the kernel.
Jan Engelhardt
--
| Alphagate Systems, http://alphagate.hopto.org/
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On Tue, 2005-07-19 at 22:15 +0200, Jan Engelhardt wrote:
AFAIK it's not possible to use SSE and MME in kernel mode, since these
registers aren't preserved (it would be expensive).
Floating point is anyway a no-no in the kernel.
However, there are a few exceptions like mmx_memcpy.
Lee
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