RFC: combine simplification change: 2-for-2-with-lesser-cost

[Steven Bosscher]

On Dec 20, 2005 10:50 AM, Hans-Peter Nilsson
<hans-peter.nilsson@axis.com> wrote:
> The actual code should be simple; I just want to check that
> there's consensus on the actual change before doing it.
>
> Thoughts?

You really have to wonder if cleaning up this jump is a job combine
should be doing.  I would have thought we'd clean this up _before_
combine (and no, I don't mean the tree optimizers, but e.g. CSE, or jump
bypassing (even though the latter doesn't work for critical edges)). Are
there other cases, you think, where we fail to combine 2 insns into 2
cheaper ones??
 
Gr.
Steven