Altera MAX 3064 CPLD weird problem

With regard to for loop in:

interrupt_trigger: PROCESS (rst_n, clk, irq_clr_reg) IS 
BEGIN
FOR i IN 0 to 6 LOOP
    IF (rst_n = '0' OR irq_clr_reg(i) = '1') THEN
       irq_trig_reg(i) <= '0';
    ELSIF (clk'EVENT AND clk = '1') THEN
          IF (irq_src_reg_posedge(i) = '1') THEN
               irq_trig_reg(i) <= '1';
          END IF;
    END IF;
END LOOP;
END PROCESS interrupt_trigger