On Sun, Feb 23, 2014 at 8:59 PM, Paul E. McKenney
wrote:
> On Sun, Feb 23, 2014 at 05:35:28PM -0800, Linus Torvalds wrote:
>>
>> But "q = p->next" is ordered by how something can alias "p->next", not by
>> 'q'!
>>
>> There is no need to restrict anything but 'p' for all of this to work.
>
> I can
On Sun, Feb 23, 2014 at 05:35:28PM -0800, Linus Torvalds wrote:
> On Sun, Feb 23, 2014 at 5:16 PM, Paul E. McKenney
> wrote:
> >>
> >> (a) we've said 'q' is restricted, so there is no aliasing between q
> >> and the pointers b/c. So the compiler is free to move those accesses
> >> around the "q =
On Sun, Feb 23, 2014 at 5:16 PM, Paul E. McKenney
wrote:
>>
>> (a) we've said 'q' is restricted, so there is no aliasing between q
>> and the pointers b/c. So the compiler is free to move those accesses
>> around the "q = p->next" access.
>
> Ah, if I understand you, very good!
>
> My example int
On Sun, Feb 23, 2014 at 11:31:25AM -0800, Linus Torvalds wrote:
> On Sat, Feb 22, 2014 at 10:34 PM, Paul E. McKenney
> wrote:
> >
> > Adding and subtracting integers to/from a RCU-protected pointer makes
> > sense to me.
>
> Ack. And that's normal "access to an object" behavior anyway.
And cover
Snapshot gcc-4.9-20140223 is now available on
ftp://gcc.gnu.org/pub/gcc/snapshots/4.9-20140223/
and on various mirrors, see http://gcc.gnu.org/mirrors.html for details.
This snapshot has been generated from the GCC 4.9 SVN branch
with the following options: svn://gcc.gnu.org/svn/gcc/trunk
When generating code for a two address machine (like x86) I'm
trying to peephole sequences for commutative operations like
(destination registers on left)
1.addRm,Rn
2.ld Rn,Rm
to
1. addRn,Rm
I have defined this peephole2
define_peephole2
[
(parallel
On Sat, Feb 22, 2014 at 10:34 PM, Paul E. McKenney
wrote:
>
> Adding and subtracting integers to/from a RCU-protected pointer makes
> sense to me.
Ack. And that's normal "access to an object" behavior anyway.
> Adding and subtracting integers to/from an RCU-protected integer makes
> sense in man
Matthew Fortune writes:
> All,
>
> Imagination Technologies would like to introduce the design of an O32
> ABI extension for MIPS to allow it to be used in conjunction with MIPS
> FPUs having 64-bit floating-point registers. This is a wide-reaching
> design that involves changes to all components
On Sat, Feb 22, 2014 at 07:50:35PM -0800, Linus Torvalds wrote:
> On Sat, Feb 22, 2014 at 4:39 PM, Paul E. McKenney
> wrote:
> >
> > Agreed, by far the most frequent use is "->" to dereference and assignment
> > to store into a local variable. The other operations where the kernel
> > expects ord
