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Re: 4 GCC regressions, 2 new, with your patch on 2002-07-18T09:56:17Z.
- From: Richard Henderson <rth at redhat dot com>
- To: Jan Hubicka <jh at suse dot cz>
- Cc: Geoff Keating <geoffk at geoffk dot org>, gcc-patches at gcc dot gnu dot org
- Date: Fri, 9 Aug 2002 18:33:24 -0700
- Subject: Re: 4 GCC regressions, 2 new, with your patch on 2002-07-18T09:56:17Z.
- References: <200207181329.g6IDT2F03232@maat.sfbay.redhat.com> <20020718200257.GD10794@atrey.karlin.mff.cuni.cz> <20020722010558.GB2484@atrey.karlin.mff.cuni.cz> <200207221204.g6MC4N814351@desire.geoffk.org> <20020722133957.GH2426@atrey.karlin.mff.cuni.cz> <200207221458.g6MEw2l14690@desire.geoffk.org> <20020725131411.GD30520@atrey.karlin.mff.cuni.cz> <jmd6t6doy2.fsf@desire.geoffk.org> <20020809091137.GG11271@atrey.karlin.mff.cuni.cz>
On Fri, Aug 09, 2002 at 11:11:37AM +0200, Jan Hubicka wrote:
> Really? I thought that the SSA on lowlevel RTL is no-no becuase of
> subregs and strict low parts etc. We need some CSE-like pass to cleanup
> after last code lowering stage in any stage and it should be global.
I think the argument goes that the bulk of the user code will
already have had global optimizations applied and that, hopefully,
there not have been hordes of code generated from the tree->rtl
lowering process that could benefit from global opts, only local.
It's something we'll have to experiment with, for sure.
r~