On Wed, 3 Nov 2021, Kito Cheng wrote:

> >  Also are we missing explicit test coverage here?  Or is it supposed to
> > be covered by the generic tests here or there already (I'm not familiar
> > with the details of the ISA extension to tell offhand), as long as the
> > extension has been enabled for the target tested, and it is just that
> > the problem has slipped through somehow?
> 
> Cost model is not easy to test (at least to me :p), I usually verify
> that by check the dump of combine pass to make sure the cost is right.

 Fair enough.  Note that intermediate dumps can be used for automatic 
verification too, with `scan-tree-dump', `scan-rtl-dump', etc. (I guess 
you probably knew that already).  I know that writing a good test case 
can be tricky.

  Maciej

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