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Re: RFC: Memory SSA. A redesign of the virtual operand scheme.


I notice in your PDF, you have:
Since alias analysis results are often conservative, may-alias sets my contain tens
and enve hundreds of symbols.

Is there a reason why not tune the aliasing anaysis to return more liberal results
instead of changing the representation?

>From looking at Tramp3D, I found (and filed) a case where the aliasing anaysis
was too conservative.  Also that was the only case I could find and it would
reduce the VOPs for this testcase after fixing this issue.  I filed this as
PR 26609.

I can look at the other testcases you mention and find more cases where
aliasing analysis is very conservative and file the bugs for them.  This
seems like a better plan than just changing the representation to work
around the fact the may-alias sets are big.

Thanks,
Andrew Pinski


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