[RFA] Code gen improvement for sim-decode.scm

[Frank Ch. Eigler]

Hi -

On Wed, Dec 06, 2000 at 11:40:18PM +1100, Ben Elliston wrote:
: The following patch improves the generated extraction code -- such that an
: `insn' variable is not defined for instructions that have zero ifields.
: [...]

Are you convinced that nothing can possibly use that variable
except ifield extraction?  Is the improvement to generated code
merely the removal of a gcc warning?  (It should be able to
zap an unused variable, resulting in no performance difference.)

- FChE
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