asm volatile statement reordering

[Jeffrey Walton]

On Tue, Oct 17, 2017 at 3:58 AM, Andrew Haley <aph@redhat.com> wrote:
> On 17/10/17 08:32, Jeffrey Walton wrote:
>> GCC guesses wrong on occasion. It will remove code that has value that
>> but does not produce an output because the language does not allow us
>> to express it.
>>
>> The C language lacks what we need to express what we need to do. Its a
>> failure of the C (and C++) committees. Its not a GCC failure.
>
> I disagree.  If you want a bunch of asms to execute in a particular
> order, add a memory clobber or some dependencies.  It's not difficult
> once you have the understanding.  In this particular case, fixing it
> is trivial, and there are many ways to do it.

Forgive my ignorance... How does one do it without ASM and in a
cross-platform fashion?

Jeff