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Re: COND_EXPR lowering patch
- From: Andrew MacLeod <amacleod at redhat dot com>
- To: Jeff Law <law at redhat dot com>
- Cc: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>, gcc mailing list <gcc at gcc dot gnu dot org>
- Date: 26 Aug 2003 15:43:41 -0400
- Subject: Re: COND_EXPR lowering patch
- References: <200308261902.h7QJ2Q7D004706@speedy.slc.redhat.com>
On Tue, 2003-08-26 at 15:02, law@redhat.com wrote:
>
>
> >SSA->Normal eliminates all the PHI
> >nodes, so these empty control structures become fair game if the
> >elements of the PHI node coalesced together and no code was inserted
> >into the empty control blocks....
> OK. I see. I'm not sure how much this happens now that we collapse
> useless control statements, even when there's a PHI in the pdom. If it
> still happens, then, yes I see how it would be useful.
>
Its probably not worth it for now then, I'll just disable the flow
removal code in dce and leave it as the lightweight version then...
Andrew