RFR(L) 8034198: Cleanup and re-factorize PhaseChaitin::build_ifg_physical()

[Rickard Bäckman]

Just a few comments on the C++ parts. I haven't verified that the logic
is still the same.

1) It seems like there are a couple of functions that could be created
in the new Pressure class to avoid code duplication. One example is the
check_for_high_pressure_block method.

2) All places that checks lrg._is_float also check lrg._is_vector. That
check could be made into a boolean method on the LRG instead. The same
for is_UP() & mask_size().

3) To make code more generic the int_pressure and float_pressure
instances could be passed the INTPRESSURE and FLOATPRESSURE and keep
those as instance variables.

Good work.

/R

On 01/14, Niclas Adlertz wrote:
> Hi all,
> 
> This is a first step to clean up the register allocator in C2. In this change we have divided the very long method build_ifg_physical() into many smaller ones, making it easier to see the steps when building the IFG (and computing the block pressure).
> We have also cleaned up old comments and improved old code, both by better naming and by simplifying expressions.
> I personally think that the easiest way to review this change is to have the old and new ifg.cpp side by side, and start from build_ifg_physical().
> The next step is to create a new class for these methods, isolating them and removing them from PhaseChaitin.
> WEBREV: http://cr.openjdk.java.net/~adlertz/JDK-8031498/webrev00/
> BUG: https://bugs.openjdk.java.net/browse/JDK-8031498
> 
> Kind Regards,
> Niclas Adlertz
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