[rvm-research] Getting the higher order 32 bits of a 32x32 bit multiplication

Hi

I've managed to make some modifications to the optimizing compiler in the
Simplifier class, related with optimization of division by constants. But
I'm having a problem which is preventing me from continuing my work. I need
to do a multiplication of 2 32 bit numbers and get the higher order 32 bits
resulting from that multiplication. I'm using the operator INT_MUL (and
I've used LONG_MUL too) to do the multiplication, which gets converted into
IA32_IMUL2. But what goes into the register I've allocated for the result
are the lower order 32 bits of the multiplication, and I can't figure out
where the other 32 bits are, or how I can access them.
So does anyone know how I can obtain those bits?

Any help would be much appreciated.

Thanks
-- 
Ricardo Coelho
Student at Instituto Superior Técnico

------------------------------------------------------------------------------
One dashboard for servers and applications across Physical-Virtual-Cloud 
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y

_______________________________________________
Jikesrvm-researchers mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/jikesrvm-researchers