[sdcc-devel] [ sdcc-Feature Requests-1156868 ] irq uses unneeded mov psw,#0x00

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Feature Requests item #1156868, was opened at 2005-03-04 18:58
Message generated for change (Tracker Item Submitted) made by Item Submitter
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Category: None
Group: None
Status: Open
Priority: 1
Submitted By: Frieder Ferlemann (frief)
Assigned to: Nobody/Anonymous (nobody)
Summary: irq uses unneeded mov psw,#0x00

Initial Comment:
The register bank is set to bank 0 although R0..R7 are
not used:


volatile data unsigned int countdown;
volatile bit flag;

void timer0_interrupt(void) interrupt 1
{
   if( countdown )
       countdown--;
   else
       flag = 1;
}



_timer0_interrupt:
        push    acc
        push    psw
        mov     psw,#0x00
;interrupt.c:6: if( countdown )
        mov     a,_countdown
        orl     a,(_countdown + 1)
        jz      00102$
00107$:
;interrupt.c:7: countdown--;
        dec     _countdown
        mov     a,#0xff
        cjne    a,_countdown,00108$
        dec     (_countdown + 1)
00108$:
        sjmp    00104$
00102$:
;interrupt.c:9: flag = 1;
        setb    _flag
00104$:
        pop     psw
        pop     acc
        reti


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