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 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
