| 1 | @ Shift by zero. |
| 2 | SSSTN | PUSH +1 |
| 3 | SSSSN | PUSH 0 |
| 4 | NSTTSTTSSN | JSR > 101100 (rshift) |
| 5 | NSTTTTTSTN | JSR > 111101 (debug:printsignednumber) |
| 6 | |
| 7 | @ Shift by one, positive sign extension. |
| 8 | SSSTSN | PUSH +2 |
| 9 | SSSTN | PUSH +1 |
| 10 | NSTTSTTSSN | JSR > 101100 (rshift) |
| 11 | NSTTTTTSTN | JSR > 111101 (debug:printsignednumber) |
| 12 | |
| 13 | @ Shift by four, positive sign extension. |
| 14 | SSSTSSSSN | PUSH +16 |
| 15 | SSSTSSN | PUSH +4 |
| 16 | NSTTSTTSSN | JSR > 101100 (rshift) |
| 17 | NSTTTTTSTN | JSR > 111101 (debug:printsignednumber) |
| 18 | |
| 19 | @ Shift by one, negative sign extension. |
| 20 | @ -9223372036854775805 = 1000000000000000000000000000000000000000000000000000000000000011 |
| 21 | @ -4611686018427387903 = 1100000000000000000000000000000000000000000000000000000000000001 |
| 22 | SSTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTSTN | PUSH -9223372036854775805 |
| 23 | SSSTN | PUSH +1 |
| 24 | NSTTSTTSSN | JSR > 101100 (rshift) |
| 25 | NSTTTTTSTN | JSR > 111101 (debug:printsignednumber) |
| 26 | |
| 27 | @ Shift by four, negative sign extension |
| 28 | @ -9223372036854775638 = 1000000000000000000000000000000000000000000000000000000010101010 |
| 29 | @ -576460752303423478 = 1111100000000000000000000000000000000000000000000000000000001010 |
| 30 | SSTSTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTSTSTSTTSN | PUSH -9223372036854775638 |
| 31 | SSSTSSN | PUSH +4 |
| 32 | NSTTSTTSSN | JSR > 101100 (rshift) |
| 33 | NSTTTTTSTN | JSR > 111101 (debug:printsignednumber) |
| 34 | |
| 35 | @ Test for special case: rshift(-1) = -1 |
| 36 | SSTTN | PUSH -1 |
| 37 | SSSTN | PUSH +1 |
| 38 | NSTTSTTSSN | JSR > 101100 (rshift) |
| 39 | NSTTTTTSTN | JSR > 111101 (debug:printsignednumber) |
| 40 | |
| 41 | @ Shift a single 1 in the MSb into all ones |
| 42 | SSTTSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSN | PUSH -(2^63) |
| 43 | SSSTTTTTTN | PUSH +63 |
| 44 | NSTTSTTSSN | JSR > 101100 (rshift) |
| 45 | NSTTTTTSTN | JSR > 111101 (debug:printsignednumber) |
| 46 | |
| 47 | @ All done. |
| 48 | NNN | DIE |
| 49 | |
| 50 | #include <logic.pvvs> |
| 51 | #include <debug.pvvs> |