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Re: some tree-ssa vs mainline stats
- From: law at redhat dot com
- To: Andrew MacLeod <amacleod at redhat dot com>
- Cc: Steven Bosscher <s dot bosscher at student dot tudelft dot nl>, Dan Nicolaescu <dann at ics dot uci dot edu>, gcc mailing list <gcc at gcc dot gnu dot org>
- Date: Fri, 20 Jun 2003 13:52:10 -0600
- Subject: Re: some tree-ssa vs mainline stats
- Reply-to: law at redhat dot com
In message <1056137390.28175.8.camel@p4>, Andrew MacLeod writes:
>On Fri, 2003-06-20 at 10:32, law@redhat.com wrote:
>>
>> >
>> >I don't suppose that the gimplifier knows when its done with a
>> >temporary? They aren't live past a stmt boundry are they?
>> It doesn't know. I don't think an are life past the original
>> statement boundary when we're done with gimplifying. However
>> be aware that we have a formal temporary table now and try
>> to ensure that every time we evaluate a pure expression the
>> destination is the same formal temporary.
>>
>But presumably, if nothing is live out a stmt, all the temporaries are
>available after every stmt, so the same ones ought to be available for
>the next stmt which is the same...
Right, but I'm pretty sure that we don't want to start using the same
formal temporary for different expressions.
Jeff