fill the vector with zeroes, even when it is not needed (as for
platforms with conservative GC or for arrays of unboxed objectes) and
is performed later explicitely.
+
+(This is harder than it might look at first glance, as MAKE-ARRAY is smart
+enough to eliminate something like ':initial-element 0'. Such an optimization
+is valid if the vector is being allocated in the heap, but not if it is being
+allocated on the stack. You could remove this optimization, but that makes
+the heap-allocated case somewhat slower...)
--------------------------------------------------------------------------------
#28
a. Accessing raw slots in structure instances is more inefficient than
Obviously, it would be better if a) we only performed one MOV prior to
all three comparisons or b) eliminated the necessity of the MOV(s)
altogether. The former option is probably easier than the latter.
+
+--------------------------------------------------------------------------------
+#37
+
+Dynamic extent allocation doesn't currently work for one-element lists,
+since there's a source transform from (LIST X) to (CONS X NIL).
+