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Re: [tree-ssa] New regressions as of 2003-11-04
- From: law at redhat dot com
- To: Andrew MacLeod <amacleod at redhat dot com>
- Cc: Jan Hubicka <jh at suse dot cz>, Diego Novillo <dnovillo at redhat dot com>, Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>, Daniel Berlin <dberlin at dberlin dot org>, gcc mailing list <gcc at gcc dot gnu dot org>
- Date: Mon, 10 Nov 2003 11:54:39 -0700
- Subject: Re: [tree-ssa] New regressions as of 2003-11-04
- Reply-to: law at redhat dot com
In message <1068041513.14345.952.camel@p4>, Andrew MacLeod writes:
>remove_useless_stmts_and_vars_cond could keep the cfg updated if it
>wanted to. It didnt before becuase it was thrown away immediately
>aftewards, so what was the point. Now perhaps there is a point.
Correct. Nothing after remove_useless_stmts_and_vars cared about the CFG
and by not doing silly work, remove_useless_stmts_and_vars actually improved
compilation times and kept the code reasonably simple.
So one thing we need to look at before we go and make that code CFG aware
is whether or not it's actually going to be a good thing from the various
angles, including the ability to eliminate obviously useless statements
created by the out-of-ssa translation, compile time concerns, the need to
actually eliminate all the empty statements, etc etc.
Jeff