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Re: Conditional TODOs on SSA-CCP
- From: Jan Hubicka <hubicka at ucw dot cz>
- To: Jan Hubicka <jh at suse dot cz>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Wed, 17 Jan 2007 12:26:01 +0100
- Subject: Re: Conditional TODOs on SSA-CCP
- References: <20070117105545.GA26837@kam.mff.cuni.cz>
> Hi,
> this patch updates ssa-ccp to return update flags conditionally. As an extra
> I've removed removal of unreferenced vars that might happen quite rarely (such
^^ added
> as for optimized out uninitalized locals) but it probably should still be
> handled if we don't want to rely on some later pass unconditinally cleaning up.
The hidden dependency was what caused David's bootstrap to break after
DCE change. My plan is to add removal of unreferenced vars to early
passes that can do it and also make cfgcleanup to drop in the TODO as
needed since removal of dead basic blocks is common source of making
variables unused.
Honza