* the switch statement is the elwidth parameter
* the case statements are the PartitionPoints
* identifies which partitions are "blank" (padding)
+
+# SimdShape API
+
+SimdShape needs:
+
+* a constructor taking the following arguments:
+ - (optional) an integer vector width or a dictionary of vector widths
+ (the keys to be the "elwidth")
+ - (mandatory) a dictionary of "partition counts":
+ the keys to again be the "elwidth" and the values
+ to be the number of Vector Elements at that elwidth
+ - (optional) a "fixed width" which if given shall
+ auto-compute the dictionary of Vector Widths
+ - (mandatory) a "signed" boolean argument which defaults
+ to False
+* a suite of operators (`__add__`, etc) that shall take simple
+ integer arguments and perform the computations on *every*
+ one of the dictionary of Vector widths (examples below)
+* a "recalculate" function (currently known as layout() in
+ layout_experimeny.py) which
+* a function which computes and returns a suite of PartitionPoints
+ as well as an "Adapter" instance, for use by PartitionedSignal
+