georg,
1. could please show a piece of c code which can be compiled to the redundant
asm ? as simple & short as possible.
2. you are welcome to create patch tickets on sourceforge with any stm8
optimized functions.
ben
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在 2014-10-02 22:57:08，"Georg Ottinger" 写道：
>ok - aft
ok - after figuring out that A is 8Bit wide (what i should have expected
on an 8Bit arch) - i have two proposals for Peephole optimizations.
1.)
ld a,(x)
ld xl,a
inc (direct)
ld a,xl
ret
to
ld a,(x)
inc (direct)
ret
2.)
ld xl, a
ld a, xh
to
rlwa (rotate word left through accumulator)
(unde
hmm ...
is ld a, (x) on stm8 a byte wise operation???
Am 2014-10-02 um 16:10 schrieb Georg Ottinger:
> I just figured out that
> s
> ld a,(x)
> ld xl, a
> ld a, xl
>
> acutally is usefull code - to zero the Upper Byte of A
>
>
>
> Am 2014-10-02 um 16:03 schrieb Georg Ottinger:
>> congrats
I just figured out that
ld a,(x)
ld xl, a
ld a, xl
acutally is usefull code - to zero the Upper Byte of A
Am 2014-10-02 um 16:03 schrieb Georg Ottinger:
> congrats to Ben Shi - his lastest patch - just shrunk my firmware from
> 4210 Bytes to 4039 Bytes thanks to _mullong_stm8
>
> I had a
