This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: [tree-ssa] Avoid nondeterminism in tree-ssanames
- From: Jan Hubicka <jh at suse dot cz>
- To: law at redhat dot com
- Cc: Jan Hubicka <jh at suse dot cz>, Geoff Keating <geoffk at geoffk dot org>,gcc-patches at gcc dot gnu dot org
- Date: Mon, 1 Dec 2003 17:33:06 +0100
- Subject: Re: [tree-ssa] Avoid nondeterminism in tree-ssanames
- References: <20031130134252.GB5334@kam.mff.cuni.cz> <200312011728.hB1HSDO3029939@speedy.slc.redhat.com>
> Please stop.
>
> 1. Re-using SSA_NAMES across different functions is a bad idea. Please let's
Why?
> not do that. The whole point of the SSA_NAME cache is to avoid silly
> GC allocations within the SSA path for a single function.
>
> 2. Long term SSA_NAME management needs to go away.
>
> 2a. First we need to be able to GC between the SSA passes.
>
> 2b. We need to be able to tell the GC system that a particular object
> is no longer being used and that the GC system should re-use that
> memory if it is convenient to do so.
>
>
>
>
> So rather than muck around making SSA_NAME (or PHI_NODE) management more
> complex, let's instead address the underlying GC issues.
OK, how would you propose to fix the problem with non-determinism in
short term?
This patch was meant as short term fix....
Honza
>
>
> Jeff
>
>
>
>