pco, pygen: generate string representations of enum elements

Signed-off-by: Simon Perretta <simon.perretta@imgtec.com>
Acked-by: Frank Binns <frank.binns@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32258>

src/imagination/pco/pco_common.h.py

@@ -34,6 +34,23 @@ enum ${enum.name} {
    % endfor
 };
 
+static inline
+const char *${enum.name}_str(enum ${enum.name} val) {
+   switch (val) {
+   % for cname, _, string in enum.elems.values():
+      % if string is not None:
+   case ${cname}:
+      return "${string}";
+      % endif
+   % endfor
+
+   default:
+      break;
+   }
+
+   unreachable();
+}
+
 % endfor
 /** Enum validation. */
 % for enum in enums.values():

src/imagination/pco/pco_isa.py

@@ -4,11 +4,11 @@
 from pco_pygen_common import *
 
 OP_PHASE = enum_type('op_phase', [
-   ('ctrl', 0),
    ('0', 0),
+   ('ctrl', 0),
    ('1', 1),
-   ('2', 2),
    ('2_pck', 2),
+   ('2', 2),
    ('2_tst', 3),
    ('2_mov', 4),
    ('backend', 5),

src/imagination/pco/pco_pygen_common.py

@@ -87,9 +87,14 @@ def enum_type(name, elems, is_bitset=False, num_bits=None, *args, **kwargs):
       assert isinstance(elem, str) and isinstance(value, int) and isinstance(string, str)
 
       assert not num_bits or val_fits_in_bits(value, num_bits), f'Element "{elem}" in elem "{name}" with value "{value}" does not fit into {num_bits} bits.'
+      # Collect valid values, ensure that elements with repeated values only have one string set.
       if is_bitset:
+         if (_valid_valmask & value) != 0:
+            string = None
          _valid_valmask |= value
       else:
+         if value in _valid_vals:
+            string = None
          _valid_vals.add(value)
 
       assert elem not in _elems.keys(), f'Duplicate element "{elem}" in enum "".'