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Another way to tag instructions...
- From: Alan Lehotsky <apl at alum dot mit dot edu>
- To: dant at picochip dot com
- Cc: gcc at gcc dot gnu dot org
- Date: Thu, 20 Jun 2002 15:31:15 -0400
- Subject: Another way to tag instructions...
One more way to do what you want occurred to me...
Add a new define_insn that uses an UNSPEC (so it can't match anything
by accident. insert the UNSPEC insns into the instruction stream to
mark the end of a VLIW schedule group.
This requires NO modification to shared GCC source (all the changes
are in your target.md and target.c files) but does depend on either
"look-ahead" (the emitter for the last real instruction has to look
forward to see if there's a VLIW-barrier immediately following) or on
whatever semantics you need to indicate the end of a compacted
instruction being simple enough....
-- Al
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