docs: def _is_noop_block(arch, block):
          """
          Check if the block is a no-op block by checking VEX statements.
  
          :param block: The VEX block instance.
          :return: True if the entire block is a single-byte or multi-byte nop instruction, False otherwise.
          :rtype: bool
          """
  
          if arch.name == "MIPS32":
              if arch.memory_endness == "Iend_BE":
                  MIPS32_BE_NOOPS = {
                      b"\x00\x20\x08\x25",  # move $at, $at
                  }
                  insns = set(block.bytes[i:i+4] for i in range(0, block.size, 4))
                  if MIPS32_BE_NOOPS.issuperset(insns):
                      return True
  
          # Fallback
          # the block is a noop block if it only has IMark statements
  
          if all((type(stmt) is pyvex.IRStmt.IMark) for stmt in block.vex.statements):
              return True
          return False