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RE: -fno-tree-cselim not working?
On 26 October 2007 17:28, Andrew Haley wrote:
> Richard Guenther writes:
> > >
> > > This is legal POSIX threads code: counter is not accessed when we do
> > > not hold the mutex. According to POSIX we do not have to declare
> > > volatile memory that we only access when we hold a mutex.
> > I hope we're not trying to support such w/o volatile counter.
> I think we have to: not just for POSIX, but for the Linux kernel too.
> > Whatever POSIX says, this would pessimize generic code too much.
> We don't have to do it for non-threaded code.
I certainly won't object to any move to prohibit the
read-conditional-add-write (and related) optimisation(s) when compiling with
an option that explicitly specifies that we are compiling multi-threaded code.
Can't think of a witty .sigline today....