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| <h1> words/doplusloop.asm </h1> |
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| <pre> |
| ; ( n1 -- ) |
| ; R(llimit counter -- limit counter+n1|) |
| ; runtime of +loop |
| ;VE_DOPLUSLOOP: |
| ; .db 7, "(+loop)" |
| ; .dw VE_HEAD |
| ; .set VE_HEAD = VE_DOPLUSLOOP |
| XT_DOPLUSLOOP: |
| .dw PFA_DOPLUSLOOP |
| PFA_DOPLUSLOOP: |
| pop zl |
| pop zh |
| add zl, tosl |
| adc zh, tosh |
| loadtos |
| PFA_DOPLUSLOOP4: ; entry point for (loop) |
| pop temp2 |
| pop temp3 |
| cp zl, temp2 |
| cpc zh, temp3 |
| sbrs tosh, 7 ; if msb is set, increment is negative. in that case skip the next instruction |
| rjmp PFA_DOPLUSLOOP2 ; jump to test for positive overflow |
| brlt PFA_DOPLUSLOOP1 ; exit if underflow |
| rjmp PFA_DOPLUSLOOP3 |
| PFA_DOPLUSLOOP2: |
| brge PFA_DOPLUSLOOP1 ; exit if overflow |
| PFA_DOPLUSLOOP3: |
| ; next iteration |
| push temp3 |
| push temp2 |
| push zh |
| push zl |
| rjmp PFA_DOBRANCH ; read next cell from dictionary and jump to its destination |
| PFA_DOPLUSLOOP1: |
| pop temp0 |
| pop temp1 ; remove leave destination |
| adiw xl, 1 ; skip branch-back address |
| rjmp DO_NEXT |
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