Am 28.03.2018 um 11:07 schrieb Eric Rullens: > Dear Philipp, > > I see you have been busy fighting the assembler (devil, details)... I also > could not get it to extract the high byte of a 24 bit word (.msb is not > available), but I could trick it into generating useful code like in the > example below. > > =================== > ; Write AC ah am al. > jpf _test2 > ; Change jpf (AC) into ld a, #ah (A6 ah). > . = . - 4 > .db 0xA6 > . = . + 1 > ; Bytes am al can be overwitten with subsequent instructions. > =================== > > The result file: > > =================== > 174 ; Write AC ah am al. > 010080 AC 01 00 94 [ 2] 175 jpf _test2 > 176 ; Change jpf (AC) into ld a, > #ah (A6 ah). > 00805C 177 . = . - 4 > 010080 A6 178 .db 0xA6 > 00805E 179 . = . + 1 > 180 ; Bytes am al can be > overwitten with subsequent instructions. > 181 ; test.c: 112: return x + 1; > 010082 .. .. [ 2] 182 ... > =================== > > A bit confusing to read, but it works for this little test. Do you think it > can also work with the code generator? > > Eric
It would work in the code generator. But it would require quite some complicated workarounds in the peephole optimizer. For now I hope that someone who knows the assembler better than me (e.g. Maarten, Ben) comes up with a simple solution (which might or might not include changes in the assembler). Philipp ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
