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 look at the asm code of my project and there more points where > optimization could be achived. - maybe I can convince someone to give it > a try - as I am not an expert to do this ;) > > for example an optimized _divulong routine - which should be > interessting as the STM8 has a hardware divder instruction. > > I also make use of _strncmp which could be optimzed but maybe that is > not so promising. > > I also noted some parts which could be optimized via peeps.def: > > > 000052 F6 [ 1] 126 ld a, (x) > 000053 97 [ 1] 127 ld xl, a > 128 ; rx_ringbuffer.c: 65: rx_tail++; > 000054 72 5Cu01u01 [ 1] 129 inc _rx_tail+0 > 130 ; rx_ringbuffer.c: 67: return temp; > 000058 9F [ 1] 131 ld a, xl > 000059 81 [ 4] 132 ret > > > => I think that the "131 ld a,xl" instruction could be omited - but I > have no Idea how to craft a peephole definition for this case. > > > best wishes, Georg > ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
