On Wed, Oct 24, 2012 at 12:36 PM, Eric Decker <cire...@gmail.com> wrote:
>
>
> On Tue, Oct 23, 2012 at 11:14 PM, mind entropy <mindentr...@gmail.com>wrote:
>
>> Hi,
>>
>> I was reading the mspgcc manual (
>>
>> http://www.eecs.harvard.edu/~konrad/projects/motetrack/mspgcc-manual-20031127.pdf
>> )
>> and on Pg 39 its written as
>>
>
> I believe there is a more up to date version but I'm not usre where it
> lives. Perhaps Peter can point to it?
>
>
>>
>> "If you execute
>> while ((long) a & 0x80000l);
>> the program will hang, unless ’a’ is declared volatile. So, do it!"
>>
> With optimization a will be put into a register (actually two registers
> since it is a long) and loaded once.
>
> If a is declared as a volatile, that tells the toolchain that a can change
> out from underneath any assumptions
> made about contents. This forces the compiler to reload a into a register
> each iteration.
>
Its loaded once during the start of the iteration right? Theoretically
if there is no change from outside is there a point
in making it volatile? i.e. if that loop block is the only thing in
the loop?
If it applies to long then it should apply to double and float also
right?
>
>> I did not get it. Why should it hang?
>>
>> Thanks,
>> Gautam.
>>
>>
>> ------------------------------------------------------------------------------
>> Everyone hates slow websites. So do we.
>> Make your web apps faster with AppDynamics
>> Download AppDynamics Lite for free today:
>> http://p.sf.net/sfu/appdyn_sfd2d_oct
>> _______________________________________________
>> Mspgcc-users mailing list
>> Mspgcc-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/mspgcc-users
>>
>>
>
>
> --
> Eric B. Decker
> Senior (over 50 :-) Researcher
>
>
>
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_sfd2d_oct
_______________________________________________
Mspgcc-users mailing list
Mspgcc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mspgcc-users
