mip.vssip is a shadow of hvip.vssip (rw shadow)
mip.vstip is a shadow of hvip.vstip
mip.vseip is a shadow of hvip.vseip
mip.sgeip is a shadow of hip.sgeip
hip.vssip is a shadow of hvip.vssip (rw shadow)
hip.vstip is a shadow of hvip.vstip
hip.vseip is a shadow of hvip.vseip
adding hip.sgeip as a ro_variable subfield
the above set of shadows apply to vsip as well.

Add Indexed reg support

Signed-off-by: S Pawan Kumar <pawan.kumar@incoresemi.com>

support for X-extension parsing

documentation clean up

Isa regex improvements issue 104

Updated instructions in new-extensions.rst to reflect that new extensions need to be added to constants.py

Refactored Z extensions into a list which is then joined into the isa_regex string to avoid repetition

* adding new function to get a legal value  from a warl node

This function is used to return a legal value for a given set of dependency_vals. If the dependency_vals is empty and self.dependencies        is not empty, then the first legal string is picked and the assignment-string substring is dierctly evaluated to get a legal value.

* Bump version: 3.1.2 → 3.2.0

* adding new function to get a legal value  from a warl node

This function is used to return a legal value for a given set of dependency_vals. If the dependency_vals is empty and self.dependencies        is not empty, then the first legal string is picked and the assignment-string substring is dierctly evaluated to get a legal value.

* Bump version: 3.1.2 → 3.2.0

we use the curly braces to indicate the the index of the register that needs to be used in checking the dependency values

* if the value being tested is out of bounds, then skip with error immediately

* Bump version: 3.1.1 → 3.1.2

* Bump version: 3.1.0 → 3.1.1

* revert to ctg doc requirements

ignore sphinx build and fix python package dependencies