replace { ld a, %1 ld %2, a } by { mov %2, %1 } if notUsed('a')Does the rule need anything else? Something to assert that the %1 and %2 source/destination addresses are 'longmem' (or 'shortmem')? Some way of determining if any following instructions rely on N/Z flags (e.g. JRNE)?
I don’t use stm8, but when I looked through it’s constraint functions, I saw that it allows things like notUsed('z')
And after a quick look into the OP codes, it looks like %1 and %2 could also be XH/YH/XL/YL/SP, which doesn’t seem to be supported by mov.
-- Freundliche Grüße / Yours sincerely Sebastian Riedel _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
