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decodetree: Document the usefulness of argument sets 

Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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Richard Henderson 2019-02-27 18:34:38 -08:00
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docs/devel/decodetree.rst
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@ -69,6 +69,13 @@ with each of the fields being one of the member arguments.
If ``!extern`` is specified, the backing structure is assumed
to have been already declared, typically via a second decoder.
Argument sets are useful when one wants to define helper functions
for the translator functions that can perform operations on a common
set of arguments. This can ensure, for instance, that the ``AND``
pattern and the ``OR`` pattern put their operands into the same named
structure, so that a common ``gen_logic_insn`` may be able to handle
the operations common between the two.
Argument set examples::
&reg3 ra rb rc