This is the mail archive of the
mailing list for the GCC project.
Re: RFC: Memory SSA. A redesign of the virtual operand scheme.
- From: Andrew Pinski <pinskia at physics dot uc dot edu>
- To: dnovillo at redhat dot com (Diego Novillo)
- Cc: gcc at gcc dot gnu dot org
- Date: Wed, 8 Mar 2006 15:05:06 -0500 (EST)
- Subject: 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
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.