Request for reviews (M): 7004555: Add new policy for one iteration loops

[Vladimir Kozlov]

Thank you, Tom

All fixed.
I moved flags to LoopNode class and renamed the rest of flags:

+  enum { Normal=0, Pre=1, Main=2, Post=3, PreMainPostFlagsMask=3,
+         MainHasNoPreLoop=4,
+         HasExactTripCount=8,
+         InnerLoop=16,
+         PartialPeelLoop=32,
+         PartialPeelFailed=64 };

-  enum { pre_post_main=0, inner_loop=8, partial_peel_loop=16, 
partial_peel_failed=32  };
-  enum { Normal=0, Pre=1, Main=2, Post=3, PrePostFlagsMask=3, 
Main_Has_No_Pre_Loop=4 };

Thanks,
Vladimir

Tom Rodriguez wrote:
> loopTransform.cpp:
> 
> bounderies -> boundaries
> 
> There's a use UseNewCode left behind
> 
> loopnode.hpp:
> 
> The relationship between the loop_flags enum in LoopNode and the one in CountedLoopNode is kind of obscure.  Could you declare them together so it's more obvious?
> 
> Otherwise it looks good.
> 
> tom
> 
> 
> On Apr 6, 2011, at 12:24 PM, Vladimir Kozlov wrote:
> 
>> http://cr.openjdk.java.net/~kvn/7004555/webrev
>>
>> Fixed 7004555: Add new policy for one iteration loops
>>
>> Add new policy for one iteration loops (mostly formal pre- loops) to fold exit condition and avoid going through do_maximally_unroll() as we do currently for such cases.
>> Move exact trip count calculation from policy_maximally_unroll() into separate method. Note, trip_count type is changed to unsigned int and its range is changed to [0, max_juint). Add new flag HasExactTripCount to indicate that loop's limits and trip count are constants.
>> Check for non overlaping init and limit values to avoid zero trip guard generation in remove_empty_loop.
>> Rename some CountedLoopNode flags.
>> Print loop iv range for counted loops dumps:
>>
>> Loop: N286/N193  predicated counted [0,2),+1
>