Incorrect code generated when the default value is set in the vector of control registers

If somebody sets the default value to a bitfield in the vector of control registers, the initialization code is generated incorrectly. Many thanks to Esteban Rubio from CBM team for finding that bug. The problem may be recreated in the "test" demo design by setting the repetition count to "1" and adding a default value to one of the bitfields in X2 register in block1.xml:

  <creg name="X2" stb="1" reps="1">
    <field name="B1" width="1" desc="Start the operation" trigger="1" />
    <field name="B2" width="1" desc="Start the operation" default="0" />
    <field name="B3" width="1" desc="Start the operation" trigger="1" />....
  </creg>

Then we get the following error in GHDL compilation:

ghdl -a -g --work=general_cores -C  --std=93c --ieee=standard general-cores/modules/wishbone/wb_register/xwb_register.vhd
ghdl -a -g --work=agwb -C  --std=93c --ieee=standard gen/agwb_pkg.vhd
ghdl -a -g --work=agwb -C  --std=93c --ieee=standard gen/MAIN_const_pkg.vhd
ghdl -a -g --work=agwb -C  --std=93c --ieee=standard gen/SYS1_pkg.vhd
ghdl -a -g --work=agwb -C  --std=93c --ieee=standard gen/SYS1.vhd
gen/SYS1.vhd:44:60:error: can't match function call with type array type "ut_x2_array"
  signal int_X2_o : ut_X2_array(g_X2_size - 1 downto 0) := to_X2(std_logic_vector(to_unsigned(0,3))); -- Hex value: 0x0
                                                           ^
gen/SYS1.vhd:122:21:error: can't match function call with type array type "ut_x2_array"
        int_X2_o <= to_X2(std_logic_vector(to_unsigned(0,3))); -- Hex value: 0x0
                    ^
ghdl:error: compilation error

The problem does not occur if the number of repetitions (reps) is higher than 1.

wzab / agwb

Incorrect code generated when the default value is set in the vector of control registers #64