[pypy-dev] PPC backend design questions

[David Edelsohn]

Attached is a new patch that corrects the PPC fields.

The only simple way I can think of handling the 64 bit immediate shift
field is by adding a keyword argument to Field to ignore overlap.
Expressing the details of the field splitting will be complicated and
doesn't seem worth it.

Is there a preference for the current patch that explicitly performs
the conversion or a new argument to ignore overlap?

Thanks, David
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