* LD/ST Immediate has no individual control over src/dest zeroing,
whereas LD/ST Indexed does.
-* LD/ST Immediate has no Saturated Pack/Unpack (Arithmetic Mode does)
-* LD/ST Indexed has no Pack/Unpack, whereas LD/ST Immediate does.
+* Post-Increment is not possible with Saturation or Data-Dependent Fail-First
These are not insurmountable problems: there do exist workarounds.
For example it is possible to set up Matrix REMAP to perform the same