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When I set optimize(9,size) to a interrupt function, which should be optimize for "Common Block Subroutines", but it wasn't! All interrupt funtions contain following duplicate blocks(see BOLD):
PUSH ACC PUSH B PUSH DPH PUSH DPL PUSH DPH1 PUSH DPL1 PUSH DPS MOV DPS,#00H PUSH PSW MOV PSW,#010H ;Depend on using. LCALL MyFunc POP PSW POP DPS POP DPL1 POP DPH1 POP DPL POP DPH POP B POP ACC RETI
Yes, you are right! The precdeing codes can't work correctly. I am so embarrassing to say such words: "everything is under control". So, it seems only LB2 could be optimize.
Your solution is good. Thank you again.