Function not work with Design compiler

Hello,everyone.

I meet the problem when I optimize my design using Design compiler. (dc_shell version - G-2012.06)

The detail error message is shown as the attached file.

View attachment syn_log.txt

Why did that happen? How to deal with it?

Note: I was confused that does the error caused by no initial value of register is settled in the RTL code.
(I don't have a reset signal due to the specific application and I don't care the initial value/state of each register.)

More information is available as
View attachment syn_tcl.txt

Any help is highly appreciated.

I suppose to post the message on board directly.
Here is the message

Name Total
--------------------------------------------------------------------------------
Inputs/Outputs 29
Unconnected ports (LINT-28) 29

Cells 6
Connected to power or ground (LINT-32) 6

Nets 22
Unloaded nets (LINT-2) 22
--------------------------------------------------------------------------------

Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_17' driven by pin 'rem_65/quotient[0]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_16' driven by pin 'rem_65/quotient[1]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_15' driven by pin 'rem_65/quotient[2]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_14' driven by pin 'rem_65/quotient[3]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_13' driven by pin 'rem_65/quotient[4]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_12' driven by pin 'rem_65/quotient[5]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_11' driven by pin 'rem_65/quotient[6]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_10' driven by pin 'rem_65/quotient[7]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_9' driven by pin 'rem_65/quotient[8]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_8' driven by pin 'rem_65/quotient[9]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_7' driven by pin 'rem_65/quotient[10]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_6' driven by pin 'rem_65/quotient[11]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_5' driven by pin 'rem_65/quotient[12]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_4' driven by pin 'rem_65/quotient[13]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_3' driven by pin 'rem_65/quotient[14]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_2' driven by pin 'rem_65/quotient[15]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'SYNOPSYS_UNCONNECTED_1' driven by pin 'rem_65/quotient[16]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'rem_65/SYNOPSYS_UNCONNECTED_5' driven by pin 'rem_65/u_div_u_add_PartRem_0_0/SUM[11]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'rem_65/SYNOPSYS_UNCONNECTED_4' driven by pin 'rem_65/u_div_u_add_PartRem_0_1/SUM[11]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'rem_65/SYNOPSYS_UNCONNECTED_3' driven by pin 'rem_65/u_div_u_add_PartRem_0_2/SUM[11]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'rem_65/SYNOPSYS_UNCONNECTED_2' driven by pin 'rem_65/u_div_u_add_PartRem_0_3/SUM[11]' has no loads. (LINT-2)
Warning: In design 'UPC', net 'rem_65/SYNOPSYS_UNCONNECTED_1' driven by pin 'rem_65/u_div_u_add_PartRem_0_4/SUM[11]' has no loads. (LINT-2)
Warning: In design 'UPC_DW_div_uns_0', port 'b[0]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'divide_by_0' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[16]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[15]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[14]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[13]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[12]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[10]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[9]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[8]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[7]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[6]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[5]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[4]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[3]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[2]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[1]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW_div_uns_0', port 'quotient[0]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_7', port 'B[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_7', port 'SUM[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_8', port 'B[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_8', port 'SUM[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_9', port 'B[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_9', port 'SUM[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_10', port 'B[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_10', port 'SUM[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_11', port 'B[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC_DW01_add_11', port 'SUM[11]' is not connected to any nets. (LINT-28)
Warning: In design 'UPC', a pin on submodule 'rem_65' is connected to logic 1 or logic 0. (LINT-32)
Pin 'b[0]' is connected to logic 1.
Warning: In design 'UPC_DW_div_uns_0', a pin on submodule 'u_div_u_add_PartRem_0_4' is connected to logic 1 or logic 0. (LINT-32)
Pin 'B[11]' is connected to logic 1.
Warning: In design 'UPC_DW_div_uns_0', a pin on submodule 'u_div_u_add_PartRem_0_3' is connected to logic 1 or logic 0. (LINT-32)
Pin 'B[11]' is connected to logic 1.
Warning: In design 'UPC_DW_div_uns_0', a pin on submodule 'u_div_u_add_PartRem_0_2' is connected to logic 1 or logic 0. (LINT-32)
Pin 'B[11]' is connected to logic 1.
Warning: In design 'UPC_DW_div_uns_0', a pin on submodule 'u_div_u_add_PartRem_0_1' is connected to logic 1 or logic 0. (LINT-32)
Pin 'B[11]' is connected to logic 1.
Warning: In design 'UPC_DW_div_uns_0', a pin on submodule 'u_div_u_add_PartRem_0_0' is connected to logic 1 or logic 0. (LINT-32)
Pin 'B[11]' is connected to logic 1.
1
exit

Thank you...