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Re: Ada and the TREE_COMPLEXITY field on struct tree_exp
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- To: stevenb dot gcc at gmail dot com
- Cc: ebotcazou at libertysurf dot fr, gcc at gcc dot gnu dot org
- Date: Thu, 18 Jan 2007 07:11:50 EST
- Subject: Re: Ada and the TREE_COMPLEXITY field on struct tree_exp
- References: <200701180921.34004.steven@gcc.gnu.org>
> Ada is the last user of the tree_exp->complexity field. Removing
> this field should reduce GCC's memory usage by about 5% on a 64 bit
> host. Could an Ada maintainer see if it possible to remove the use
> of this field? I would think it shouldn't be too hard --
> TREE_COMPLEXITY is used only inside ada/decl.c. But I haven't been
> able to figure out myself yet how to avoid using TREE_COMPLEXITY there...
It's just being used as a cache to avoid recomputing a value. My
suggestion would be to replace it with a hash table. It'll tend to keep nodes
around a little more than usual, but that should be a tiny cost.