Unnecessary Push/Pop

[britlion]

Straight to assembler, without O3 -

Code:

SUB pokethis(value as uByte)
poke @label+1,value
return

label:
asm
LD A,0 ; This will be poked.
end asm
END SUB

Turns the relevant part into:

Code:

_pokethis:
    push ix
    ld ix, 0
    add ix, sp
    ld hl, __LABEL__label
    inc hl
    push hl
    ld a, (ix+5)
    pop hl
    ld (hl), a
    jp _pokethis__leave
__LABEL__label:
#line 6
        LD A,00

With O3, it does certainly see the optimization, showing that the optimizer module is very impressive!:

Code:

_pokethis:
    push ix
    ld ix, 0
    add ix, sp
    ld hl, __LABEL__label
    inc hl
    ld a, (ix+5)
    ld (hl), a
    jp _pokethis__leave

The other thing that I'm curious about (as I noted in the other post, with this code in it), is that it doesn't load HL with [@label+1] - it loads it with @label, and then does inc HL. This isn't optimized by -O3.