WARNING:Xst:382 - Register reg1 is equivalent to reg2.
Register reg1 equivalent to reg2 has been removed.
WARNING:Xst:1710 - FF/Latch reg (without init value) is constant in block block.
WARNING:Xst 1293 - FF/Latch reg is constant in block block.
WARNING:Xst:1291 - FF/Latch reg is unconnected in block block.
WARNING:Xst:1426 - The value init of the FF/Latch reg hinders the constant cleaning in the block block. You could achieve better results by setting this init to value.