On 05/04/2015 11:07 AM, Vladimir Makarov wrote:
>>>
>>>So I could implement the output reloads in LRA, probably for the
>>> next GCC release. How to enable and mostly use it for multi-target
>>> code like the kernel is another question.
>> Pretty much all inline asm is in per arch code; so one
On 02/05/15 08:43 AM, Peter Zijlstra wrote:
On Fri, May 01, 2015 at 03:02:24PM -0400, Vladimir Makarov wrote:
Currently LRA is used by x86/x86-64, ARM, AARCH64, s390, and MIPS.
PPC, SH, and ARC are moving to LRA. All other targets are still
reload based.
So I could implement the output
On 05/02/2015 05:39 AM, Peter Zijlstra wrote:
> On Fri, May 01, 2015 at 01:49:52PM -0700, Linus Torvalds wrote:
>> On Fri, May 1, 2015 at 12:02 PM, Vladimir Makarov
>> wrote:
>>>
>>> GCC RA is a major reason to prohibit output operands for asm goto.
>>
>> Hmm.. Thinking some more about it, I th
On Fri, May 01, 2015 at 05:16:30PM +0200, Peter Zijlstra wrote:
> diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h
> index cfe3b954d5e4..bcf4fa77c04f 100644
> --- a/arch/x86/include/asm/bitops.h
> +++ b/arch/x86/include/asm/bitops.h
> @@ -313,6 +313,15 @@ static __always_
On Fri, May 01, 2015 at 03:02:24PM -0400, Vladimir Makarov wrote:
> Currently LRA is used by x86/x86-64, ARM, AARCH64, s390, and MIPS.
> PPC, SH, and ARC are moving to LRA. All other targets are still
> reload based.
>
> So I could implement the output reloads in LRA, probably for the
> next
On Fri, May 01, 2015 at 01:49:52PM -0700, Linus Torvalds wrote:
> On Fri, May 1, 2015 at 12:02 PM, Vladimir Makarov wrote:
> >
> > GCC RA is a major reason to prohibit output operands for asm goto.
>
> Hmm.. Thinking some more about it, I think that what would actually
> work really well at lea
On 01/05/15 04:49 PM, Linus Torvalds wrote:
On Fri, May 1, 2015 at 12:02 PM, Vladimir Makarov wrote:
GCC RA is a major reason to prohibit output operands for asm goto.
Hmm.. Thinking some more about it, I think that what would actually
work really well at least for the kernel is:
(a) all
On Fri, May 1, 2015 at 12:02 PM, Vladimir Makarov wrote:
>
> GCC RA is a major reason to prohibit output operands for asm goto.
Hmm.. Thinking some more about it, I think that what would actually
work really well at least for the kernel is:
(a) allow *memory* operands (ie "=m") as outputs and
On 01/05/15 12:33 PM, Jakub Jelinek wrote:
On Fri, May 01, 2015 at 09:03:32AM -0700, Linus Torvalds wrote:
PPS. Jakub, I see gcc5.1 still hasn't got output operands for asm goto;
is this something we can get 'fixed' ?
CCing Richard as author of asm goto and Vlad as register allocator
ma
* Peter Zijlstra wrote:
> On Fri, May 01, 2015 at 06:33:29PM +0200, Jakub Jelinek wrote:
> > On Fri, May 01, 2015 at 09:03:32AM -0700, Linus Torvalds wrote:
> > > > PPS. Jakub, I see gcc5.1 still hasn't got output operands for asm goto;
> > > > is this something we can get 'fixed' ?
> >
>
On Fri, May 01, 2015 at 06:33:29PM +0200, Jakub Jelinek wrote:
> On Fri, May 01, 2015 at 09:03:32AM -0700, Linus Torvalds wrote:
> > > PPS. Jakub, I see gcc5.1 still hasn't got output operands for asm goto;
> > > is this something we can get 'fixed' ?
>
> CCing Richard as author of asm goto a
On Fri, May 1, 2015 at 9:33 AM, Jakub Jelinek wrote:
>
> CCing Richard as author of asm goto and Vlad as register allocator
> maintainer. There are a few enhancement requests to support this, like
> http://gcc.gnu.org/PR59615 and http://gcc.gnu.org/PR52381 , but indeed the
> reason why no outputs
On Fri, May 01, 2015 at 09:03:32AM -0700, Linus Torvalds wrote:
> > PPS. Jakub, I see gcc5.1 still hasn't got output operands for asm goto;
> > is this something we can get 'fixed' ?
CCing Richard as author of asm goto and Vlad as register allocator
maintainer. There are a few enhancement re
On Fri, May 01, 2015 at 06:16:54PM +0200, Peter Zijlstra wrote:
> On Fri, May 01, 2015 at 09:03:32AM -0700, Linus Torvalds wrote:
> > On Fri, May 1, 2015 at 8:16 AM, Peter Zijlstra wrote:
> > >
> > > Since test_bit() doesn't actually have any output variables, we can use
> > > asm goto without hav
On Fri, May 01, 2015 at 09:03:32AM -0700, Linus Torvalds wrote:
> On Fri, May 1, 2015 at 8:16 AM, Peter Zijlstra wrote:
> > PPS. Jakub, I see gcc5.1 still hasn't got output operands for asm goto;
> > is this something we can get 'fixed' ?
>
> I suspect the problem is that now the particular
On Fri, May 01, 2015 at 09:03:32AM -0700, Linus Torvalds wrote:
> On Fri, May 1, 2015 at 8:16 AM, Peter Zijlstra wrote:
> >
> > Since test_bit() doesn't actually have any output variables, we can use
> > asm goto without having to add a memory clobber. This reduces the code
> > to something sensib
On Fri, May 1, 2015 at 8:16 AM, Peter Zijlstra wrote:
>
> Since test_bit() doesn't actually have any output variables, we can use
> asm goto without having to add a memory clobber. This reduces the code
> to something sensible:
Yes, looks good, except if we have anything that actually wants to us
17 matches
Mail list logo
