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Re: DFA Instruction Output for VLIW
- From: Dan Towner <dant at picochip dot com>
- To: Vladimir Makarov <vmakarov at redhat dot com>
- Cc: law at redhat dot com, gcc at gcc dot gnu dot org
- Date: Mon, 17 Jun 2002 13:29:28 +0100
- Subject: Re: DFA Instruction Output for VLIW
- Organization: picoChip Designs Ltd.
- References: <19883.1024080201@porcupine.cygnus.com> <3D0A3F53.71C62A96@redhat.com>
Vlad,
> You could use dfa pipeline hazard recognizer on final phase (see macro
> FINAL_PRESCAN_INSN) to find start of a new VLIW insn and get an
> execution unit used by the insn. In this case you should describe such
> units as (define_query_cpu_unit).
How do I query an instruction rtx to find out which EU it uses? I've
looked through the documentation, but can't find a description anywhere,
nor can I find another target which uses the query operation either.
Thanks,
Dan.
=============================================================================
Daniel Towner
picoChip Designs Ltd., Riverside Buildings, 108, Walcot Street, BATH,
BA1 5BG
dant@picochip.com
07786 702589