[gimple] assignments to volatile

[Mark Mitchell]

Michael Matz wrote:

>> Would you be willing to make a Wiki page with this information on it?
> 
> http://gcc.gnu.org/wiki/VolatileAccessComparison

Thanks!  This is a big help.

I filled in rows for RealView 3.1 and RealView 4.0 and for Visual C++
2010.  It looks like RealView behaves like ICC, which isn't too
surprising given that they are both EDG-based compilers.  On the other
Visual C++ behaves like the current 4.6 trunk.  So, we certainly do not
have agreement across implementors as to what behavior is right.

I'd like to see what some of the other embedded compilers like Green
Hills, CodeWarrior, IAR, and Keil do.

One thing that I'm confused about is that Nathan reported inconsistency
between the constant and non-constant cases.  But, while your table
shows that for GCC 3.3, it doesn't show it for the current 4.6 trunk.
Nathan, are we missing something in the test cases relative to the
inconsistency you reported?

Thanks,

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
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