[PATCH] simplify-rtx.c: Change BITSIZE to UNIT_PRECISION in simplification

[John Darrington]

On Wed, Jul 03, 2019 at 04:32:54PM -0600, Jeff Law wrote:

     John, I assume you're doing this for an out of tree port (s12z?)?

That is correct.

     Otherwise it'd also be useful if you could include a test which triggers
     the assert.

Once I have the other aspects of the port sorted out I can create a test
case (although it wouldn't be necessary because it happens building
libgcc).
     
     If you could confirm that Richard's suggestion of using
     GET_MODE_PRECISION rather than GET_MODE_UNIT_PRECISION works it'd be
     appreciated.

I had wondered about the difference between the two.   Unfortunately, 
neither are mentioned in gccint.texinfo   - I ended up deciding upon
GET_MOE_UNIT_PRECISION because there is a similar situation a few lines
above in simplify-rtx.c which uses it.   

If GET_MODE_UNIT_PRECISION is inappropriate, then please change it.


Regards,

John

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