Hi,
gcc-4.7.2 adds exception handling constructs (try/finally block) for
pointer and array variables. These variables are CLOBBERed in the
finally block.
What is the meaning and use of CLOBBER? In which cases is it required?
What will happen if gcc does not CLOBBER these variables (e.g.
gcc-4.6.2
On Wed, 2013-05-29 at 10:06 -0400, Ryan Johnson wrote:
> On 29/05/2013 9:41 AM, Ian Lance Taylor wrote:
> > On Tue, May 28, 2013 at 9:02 PM, Ryan Johnson
> > wrote:
> >> Maybe I misunderstood... there's currently a (very small) cache
> >> (unwind-dw2-fde-dip.c) that lives behind the loader mutex.
On Tue, 2013-05-28 at 20:30 +0200, Florian Weimer wrote:
> On 05/28/2013 08:09 PM, Václav Zeman wrote:
>
> > If the bottleneck is really in glibc, then you should probably ask them
> > to fix it. Could the mutex be changed rwlock instead?
>
> rwlocks don't eliminate hardware contention, so I doub
On Thu, May 30, 2013 at 11:21:08AM +0200, Torvald Riegel wrote:
> On Tue, 2013-05-28 at 20:30 +0200, Florian Weimer wrote:
> > On 05/28/2013 08:09 PM, Václav Zeman wrote:
> >
> > > If the bottleneck is really in glibc, then you should probably ask them
> > > to fix it. Could the mutex be changed r
Is there any documentation for what gcc does with branch prediction
information it gets from profiling? I am interested in this for
modern Pentium processors where you can no longer give hints.
Specifically I am interested in whether there are in fact any
optimisations that work reliably from thi
On Thu, 2013-05-30 at 11:28 +0200, Jakub Jelinek wrote:
> On Thu, May 30, 2013 at 11:21:08AM +0200, Torvald Riegel wrote:
> > On Tue, 2013-05-28 at 20:30 +0200, Florian Weimer wrote:
> > > On 05/28/2013 08:09 PM, Václav Zeman wrote:
> > >
> > > > If the bottleneck is really in glibc, then you shou
On Thu, 30 May 2013 11:04:55 +0800, Chung-Ju Wu wrote:
> 2013/5/30 Michael Witten :
>> It would probably be a good idea to mention:
>>
>> contrib/download_prerequisites
>>
>> on this page:
>>
>> http://gcc.gnu.org/install/prerequisites.html
>>
>> and probably on this page:
>>
>> http://gcc.g
> Is there any documentation for what gcc does with branch prediction
> information it gets from profiling? I am interested in this for
> modern Pentium processors where you can no longer give hints.
The profile feedback drives optimizations (i.e. decision what to optimize for
speed and what for
Thank you for this. My question was about something more specific
however. I am interested specifically in branch prediction. For
example one could add __builtin_expect or the compiler can use the
information it finds in its profiling. How is this information used
by gcc to provide optimised ass
On 05/30/2013 03:03 PM, Raphael Clifford wrote:
> Thank you for this. My question was about something more specific
> however. I am interested specifically in branch prediction. For
> example one could add __builtin_expect or the compiler can use the
> information it finds in its profiling. How
On Thu, May 30, 2013 at 9:41 AM, Michael Witten wrote:
> That wiki information should be incorporated into what that wiki page
> calls `the official installation docs', and the rest of it should
> probably be thrown out as superfluous.
I agree that information about GCC is randomly spread betwee
--prefix=/usr/snp
--with-gnu-as --with-gnu-ld --enable-languages=fortran
--disable-libmudflap --disable-multilib --disable-nls --with-arch=native
--with-tune=native
Thread model: posix
gcc version 4.7.4 20130530 (prerelease) (GCC)
augmented by this single change:
toon@super:~/compilers/g
ER=/usr/snp/libexec/gcc/x86_64-unknown-linux-gnu/4.7.4/lto-wrapper
> Target: x86_64-unknown-linux-gnu
> Configured with: ../gcc-4_7-branch/configure --prefix=/usr/snp --with-gnu-as
> --with-gnu-ld --enable-languages=fortran --disable-libmudflap
> --disable-multilib --disable-nls --w
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México D.F. 13 y 14 de JUNIO 2013
Gestión, Coordinación e Integración del Almacén en entornos SAP
14 horas de formación intensiva con un programa diseñado a su medida que le
ofrece la formación que profesionales como Ud. demandan.
*
On Thu, May 30, 2013 at 2:07 AM, Vini Kanvar wrote:
>
> gcc-4.7.2 adds exception handling constructs (try/finally block) for
> pointer and array variables. These variables are CLOBBERed in the
> finally block.
I'm not sure what you mean by this. An example might help.
> What is the meaning and
On Thu, May 30, 2013 at 3:31 PM, Ian Lance Taylor wrote:
> On Thu, May 30, 2013 at 2:07 AM, Vini Kanvar wrote:
>>
>> gcc-4.7.2 adds exception handling constructs (try/finally block) for
>> pointer and array variables. These variables are CLOBBERed in the
>> finally block.
>
> I'm not sure what yo
Snapshot gcc-4.8-20130530 is now available on
ftp://gcc.gnu.org/pub/gcc/snapshots/4.8-20130530/
and on various mirrors, see http://gcc.gnu.org/mirrors.html for details.
This snapshot has been generated from the GCC 4.8 SVN branch
with the following options: svn://gcc.gnu.org/svn/gcc/branches
On 29/05/2013 4:13 AM, Richard Biener wrote:
On Wed, May 29, 2013 at 2:47 AM, Ian Lance Taylor wrote:
On Mon, May 27, 2013 at 3:20 PM, Ryan Johnson
wrote:
I have a large C++ app that throws exceptions to unwind anywhere from 5-20
stack frames when an error prevents the request from being serv
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