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Re: Patch for automaton based pipeline hazard recognizer (part #1).
- To: Vladimir Makarov <vmakarov at redhat dot com>
- Subject: Re: Patch for automaton based pipeline hazard recognizer (part #1).
- From: Bernd Schmidt <bernds at cambridge dot redhat dot com>
- Date: Thu, 22 Feb 2001 15:53:58 +0000 (GMT)
- Cc: <gcc-patches at gcc dot gnu dot org>
On Tue, 20 Feb 2001, Vladimir Makarov wrote:
>
> As for minimal cost, the current scheduler doesn't take into account
> that there are processors where insn latency is zero (of course
> logically). We could make that the scheduler using old pipeline
> interface also could be adequate to such processors.
What are the problems with that? I just ran into a case where priority()
would take exponential time, but other than that I don't see any problems.
The ia64 machine description has a few insns with zero latency.
Bernd