base:advanced_optimizing
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision | ||
| base:advanced_optimizing [2016-06-19 09:47] – [Forming terms] bitbreaker | base:advanced_optimizing [2017-03-04 22:25] – [DCP/ISC] monte_carlos | ||
|---|---|---|---|
| Line 1154: | Line 1154: | ||
| Another good use can be made if you want to do a inc/dec ($xx),y what is actually not available. So here isc/dcp ($xx),y will help you out, as it is also available for the indirect y adressing mode. | Another good use can be made if you want to do a inc/dec ($xx),y what is actually not available. So here isc/dcp ($xx),y will help you out, as it is also available for the indirect y adressing mode. | ||
| + | f.e.: | ||
| + | |||
| + | < | ||
| + | ldy #.. | ||
| + | lda (zp),y | ||
| + | clc | ||
| + | adc #.. | ||
| + | sta (zp),y | ||
| + | bcc + | ||
| + | iny | ||
| + | isc (zp),y | ||
| + | + | ||
| + | </ | ||
| + | |||
| + | or | ||
| + | |||
| + | < | ||
| + | ldy #.. | ||
| + | lda (zp),y | ||
| + | sec | ||
| + | sbc #.. | ||
| + | sta (zp),y | ||
| + | bcs + | ||
| + | iny | ||
| + | dcp (zp),y | ||
| + | + | ||
| + | </ | ||
| For decrementing a 16 bit pointer it is also of good use: | For decrementing a 16 bit pointer it is also of good use: | ||
base/advanced_optimizing.txt · Last modified: 2024-03-03 11:06 by bitbreaker