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Re: [tree-ssa] New regressions as of 2003-11-04
- From: Andrew MacLeod <amacleod at redhat dot com>
- To: Jeff Law <law at redhat dot com>
- Cc: 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>, JanHubicka <jh at suse dot cz>, gcc mailing list <gcc at gcc dot gnu dot org>
- Date: 04 Nov 2003 16:59:58 -0500
- Subject: Re: [tree-ssa] New regressions as of 2003-11-04
- References: <200311042155.hA4LtQvf017601@speedy.slc.redhat.com>
On Tue, 2003-11-04 at 16:55, law@redhat.com wrote:
> In message <1067981299.7039.71.camel@p4>, Andrew MacLeod writes:
> >Has remove_useless_stmts_and_vars_cond() been modified since/during
> >lowering?
> The code to handle this kind of stuff certainly hasn't been changed
> in any significant way.
>
> > it pretty much has to be since there is never anything
> >actually *IN* the arms now, so it oughta be looking in the target block,
> >and it wouild pick this up wouldn't it?
> Right. The only difficulty is you don't have easy access to the
> target block in that code since your CFG is potentially horked.
>
> [ Then again, maybe the lowering changes mean the CFG isn't horked
> anymore.. I haven't though much about that. ]
>
Well, SSA->normal doesn't hork anything... So it should be fine coming
out of there.
Although its about to not be pure GIMPLE any more coming out of SSA :-),
but then I dont think you were depending on anything like that...
Andrew