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Re: Proposed major change to combine
- To: tege at swox dot com
- Subject: Re: Proposed major change to combine
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- Date: Thu, 8 Mar 01 10:38:40 EST
- Cc: gcc at gcc dot gnu dot org
Whenever three insns are cheaper than two insns,
the three insns would be better.
We currently have no metric that would tell us that: I don't think
adding up rtx_cost of all the SET_SRC expressions is meant for that
sort of purpose. Moreover, it seems unlikely for modern machines.
Can you give an example?