bits
| bit manipulation |
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| CPUID | official mnemonic |
operation | description | example | better mnemonic from description |
better mnemonic from operation |
| TBM | BLCS | X | (X+1) | turn on rightmost 0-bit | 10101011 => 10101111 | BM SET RM0 | ADD1OR |
| BMI | BLSR | X & (X-1) | turn off rightmost 1-bit -- test if X is 2^n | 10101000 => 10100000 | BM CLR RM1 | SUB1AND |
| TBM | BLCFILL | X & (X+1) | right-propagate rightmost 0-bit -- test if X is 2^n-1 | 10100111 => 10100000 | BM RPR RM0 | ADD1AND |
| TBM | BLSFILL | X | (X-1) | right-propagate rightmost 1-bit | 10101000 => 10101111 | BM RPR RM1 | SUB1OR |
| TBM | BLCMSK | X ^ (X+1) | form mask of rightmost 0 and trailing 1s | 10101011 => 00000111 | BM FM RM0 T1S | ADD1XOR |
| BMI | BLSMSK | X ^ (X-1) | form mask of rightmost 1 and trailing 0s | 10101000 => 00001111 | BM FM RM1 T0S | SUB1XOR |
| BMI | BLSI | X & -X | form mask of rightmost 1-bit | 10100100 => 00000100 | BM FM RM1 | NEGAND |
| TBM | BLCIC | ~X & (X+1) | form mask of rightmost 0-bit | 10101011 => 00000100 | BM FM RM0 | ADD1ANDN |
| TBM | TZMSK | ~X & (X-1) | form mask of trailing 0s | 10101000 => 00000111 | BM FM T0S | SUB1ANDN |
| TBM | BLCI | X | ~(X+1) | form complemented mask of rightmost 0-bit | 10101011 => 11111011 | BM FCM RM0 | ADD1NOTOR |
| TBM | BLSIC | ~X | (X-1) | form complemented mask of rightmost 1-bit | 10101100 => 11111011 | BM FCM RM1 | SUB1ORN |
| TBM | T1MSKC | ~X | (X+1) | form complemented mask of trailing 1s | 10101011 => 11111100 | BM FCM T1S | ADD1ORN |
| binary logical operations |
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| 1 | 1 | 0 | 0 | input X | Accu Mem Both Compl Zero One |
|
| 1 | 0 | 1 | 0 | input Y | ||
| bits | operation | instruction | PDP-10 | |||
| 0 | 0 | 0 | 0 | 0 | 0 | SETZ |
| 1 | 0 | 0 | 0 | X & Y | AND | AND |
| 0 | 1 | 0 | 0 | X & ~Y | ANDNBMI | ANDCA |
| 1 | 1 | 0 | 0 | X | X | SETM |
| 0 | 0 | 1 | 0 | ~X & Y | ANDNBMI | ANDCM |
| 1 | 0 | 1 | 0 | Y | Y | SETA |
| 0 | 1 | 1 | 0 | X ^ Y | XOR | XOR |
| 1 | 1 | 1 | 0 | X | Y | OR | IOR |
| 0 | 0 | 0 | 1 | ~(X | Y) | NORn/a | ANDCB |
| 1 | 0 | 0 | 1 | ~(X ^ Y) | NXORn/a | EQV |
| 0 | 1 | 0 | 1 | ~Y | NOT | SETCA |
| 1 | 1 | 0 | 1 | X | ~Y | ORN=NANDNn/a | ORCA |
| 0 | 0 | 1 | 1 | ~X | NOT | SETCM |
| 1 | 0 | 1 | 1 | ~X | Y | ORN=NANDNn/a | ORCM |
| 0 | 1 | 1 | 1 | ~(X & Y) | NANDn/a | ORCB |
| 1 | 1 | 1 | 1 | 1 | 1 | SETO |
© 1996-2024 by Christian Ludloff. All rights reserved. Use at your own risk.