playground:reversing_bits_in_a_byte
Differences
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| playground:reversing_bits_in_a_byte [2020-02-12 16:42] – created icepic | playground:reversing_bits_in_a_byte [2020-02-14 22:46] – verz | ||
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| using X and Y for temporary storage and only short 2-cycle instructions in the loop. | using X and Y for temporary storage and only short 2-cycle instructions in the loop. | ||
| Of course a table lookup will be faster if you do this a lot in your code. | Of course a table lookup will be faster if you do this a lot in your code. | ||
| + | |||
| + | -- | ||
| + | this would be faster (enter with the value in .A, result in .A, .X will be 0) | ||
| + | < | ||
| + | ldx #8 | ||
| + | loop asl | ||
| + | ror $2 | ||
| + | dex | ||
| + | bne loop | ||
| + | lda $2 | ||
| + | |||
| + | rts | ||
| + | </ | ||
playground/reversing_bits_in_a_byte.txt · Last modified: 2020-03-12 13:05 by tlr