Checks ordering: nop vs trap

[ajayvreddy]

Hi,
I have a very basic question as to what should take higher precedence.
If no instruction is performed for a certain configuration but it has illegal values for some other field. What should happen.

eg. for Vector reduction Operations, the spec mentions that: If vl=0, no operation is performed and the destination register is not updated..

so, for EEW >64 (illegal) and vl =0, should it take an exception or nop.