projects / pdp8.git / blame
| Commit | Line | Data |
|---|---|---|
| 81e70d48 PH |
1 | / -+-+-+-+-+ \ e H P S H F T . R A \ e -+-+-+-+-+\r |
| 2 | /\r | |
| 3 | / F4 INTEGER FUNCTION SHIFT (CNT,VAR)\r | |
| 4 | /\r | |
| 5 | / PERFORMS A LOGICAL LEFT OR RIGHT SHIFT WITH THE SECOND PARAMETER VAR.\r | |
| 6 | / THE INTEGER CNT WITH -37<CNT<37 SPECIFIES THE NUMBER AND DIRECTION OF\r | |
| 7 | / THE SHIFTS TO PERFORM.\r | |
| 8 | / IF CNT IS LESS THAN 0 THEN SHIFT PERFORMS A LEFT SHIFT, ELSE A RIGHT ONE\r | |
| 9 | / THE PARAMETERS CNT AND VAR REMAIN UNCHANGED.\r | |
| 10 | /\r | |
| 11 | / HARDWARE: LAB8/E, KE8-E, HARD/SOFT FPP12\r | |
| 12 | /\r | |
| 13 | / VER 0.0 20-AUG-80 HA *\r | |
| 14 | /\r | |
| 15 | \r | |
| 16 | / SHIFT ROUTINE\r | |
| 17 | / I=SHIFT (CNT,VAR)\r | |
| 18 | / IF CNT > 0 THEN DO A LOGICAL RIGHT SHIFT ELSE\r | |
| 19 | / LOGICAL LEFT SHIFT\r | |
| 20 | / VAR IS THE VARIABLE TO BE SHIFTED\r | |
| 21 | /\r | |
| 22 | SECT #SHIFT\r | |
| 23 | ENTRY SHIFT\r | |
| 24 | BASE 0\r | |
| 25 | TWO, 0\r | |
| 26 | 2\r | |
| 27 | TMPX, ORG .+2\r | |
| 28 | /\r | |
| 29 | /\r | |
| 30 | SHIFT, STARTD\r | |
| 31 | FLDA 10*3 / GET RETURN ADR AND\r | |
| 32 | FSTA GOBAK / STORE INTO GOBAK\r | |
| 33 | FLDA 0\r | |
| 34 | FADD TWO\r | |
| 35 | FSTA TMPX\r | |
| 36 | FSTA 3\r | |
| 37 | FLDA% 3\r | |
| 38 | FSTA 3\r | |
| 39 | STARTF\r | |
| 40 | FLDA% 3 / FIRST PARAM. --> FAC\r | |
| 41 | SETX X0\r | |
| 42 | ATX X1 / CONVERT INTO INTEGER AND STORE INTO CNT\r | |
| 43 | STARTD\r | |
| 44 | FLDA TMPX\r | |
| 45 | FADD TWO\r | |
| 46 | FSTA 3\r | |
| 47 | FLDA% 3\r | |
| 48 | FSTA 3\r | |
| 49 | STARTF\r | |
| 50 | FLDA% 3\r | |
| 51 | FSTA VAR\r | |
| 52 | TRAP4 SHIFT8 / KE8-E DOES THE WORK\r | |
| 53 | FLDA VAR\r | |
| 54 | GOBAK, JA .-.\r | |
| 55 | /\r | |
| 56 | /\r | |
| 57 | SECT8 #SHIF8\r | |
| 58 | X0, ORG .+2 / DEFINE THE X REG. BASE\r | |
| 59 | X1= 1\r | |
| 60 | CNT= X0+X1\r | |
| 61 | REMAIN, ORG .+1 / NUMBER OF SHIFTS LESS THAN 12 (REMAINDER OF CNT/12 )\r | |
| 62 | REP, ORG .+1 / NUMBER OF 12 BIT SHIFTS\r | |
| 63 | VAR, ORG .+3\r | |
| 64 | TMP1, ORG .+1\r | |
| 65 | TMP2, ORG .+1\r | |
| 66 | C1, 014 / 12\r | |
| 67 | /\r | |
| 68 | / KE8-E INSTRUCTIONS\r | |
| 69 | SHL= 07413\r | |
| 70 | CIA= 07041\r | |
| 71 | SWAB= 07431\r | |
| 72 | SWBA= 07447\r | |
| 73 | DST= 07445\r | |
| 74 | LSR= 07417\r | |
| 75 | CAM= 07621\r | |
| 76 | SWP= 07521\r | |
| 77 | DVI= 07407\r | |
| 78 | MQL= 07421\r | |
| 79 | MQA= 07501\r | |
| 80 | ACL= 07701\r | |
| 81 | CDI= 06203\r | |
| 82 | /\r | |
| 83 | SHIFT8, .-.\r | |
| 84 | SWAB / KE8-E --> MODE B, CLEAR AC!\r | |
| 85 | TAD CNT\r | |
| 86 | SMA CLA / IF CNT > 0 THEN GO TO RIGHTSHIFT ELSE\r | |
| 87 | JMP RSHIFT\r | |
| 88 | TAD CNT\r | |
| 89 | CIA\r | |
| 90 | DCA CNT / CONVERT TO POSITIVE NUMBER\r | |
| 91 | JMS SHIFT0 / SET UP REPEAT COUNTERS\r | |
| 92 | JMP LOOP1 / THERE ARE SOME 12 BIT SHIFTS TO DO\r | |
| 93 | JMP LOOP2 / THERE ARE NO 12 BIT SHIFTS\r | |
| 94 | LOOP1, TAD C1\r | |
| 95 | DCA I1 / INSERT 12 BIT SHIFT INSTRUCTION\r | |
| 96 | JMS SHIFT2\r | |
| 97 | ISZ REP\r | |
| 98 | JMP LOOP1\r | |
| 99 | LOOP2, TAD REMAIN / SHIFT THE REMAINING BITS\r | |
| 100 | SNA / IF THERE ARE NO SHIFT'S LEFT THEN WE GO HOME\r | |
| 101 | JMP HOME\r | |
| 102 | DCA I1\r | |
| 103 | JMS SHIFT2\r | |
| 104 | CDI\r | |
| 105 | JMP% SHIFT8\r | |
| 106 | /\r | |
| 107 | /\r | |
| 108 | RSHIFT, JMS SHIFT0 / SET UP REPEAT COUNTERS\r | |
| 109 | JMP ROOP1\r | |
| 110 | JMP ROOP2\r | |
| 111 | ROOP1, TAD C1\r | |
| 112 | DCA I3\r | |
| 113 | JMS SHIFT4\r | |
| 114 | ISZ REP\r | |
| 115 | JMP ROOP1\r | |
| 116 | ROOP2, TAD REMAIN\r | |
| 117 | SNA / TEST IF THERE ARE REMAINING BITS TO SHIFT\r | |
| 118 | JMP HOME\r | |
| 119 | DCA I3\r | |
| 120 | JMS SHIFT4\r | |
| 121 | HOME,\r | |
| 122 | CDI\r | |
| 123 | JMP% SHIFT8 / HOME TO MAMA\r | |
| 124 | /\r | |
| 125 | /\r | |
| 126 | SHIFT0, .-. / SET UP REPEAT COUNTERS\r | |
| 127 | TAD CNT\r | |
| 128 | SWBA / KE8E --> A, AC --> MQ\r | |
| 129 | MQL\r | |
| 130 | DVI\r | |
| 131 | 014\r | |
| 132 | DCA REMAIN\r | |
| 133 | ACL\r | |
| 134 | DCA REP\r | |
| 135 | SWAB / RESET KE8-E\r | |
| 136 | TAD REP\r | |
| 137 | SNA\r | |
| 138 | ISZ SHIFT0 / SECOND POINT OF RETURN\r | |
| 139 | CIA\r | |
| 140 | DCA REP\r | |
| 141 | JMP% SHIFT0\r | |
| 142 | /\r | |
| 143 | /\r | |
| 144 | SHIFT1, .-. / LOGICAL LEFT SHIFT FOR I1 POSITIONS AC & MQ\r | |
| 145 | MQL\r | |
| 146 | SHL\r | |
| 147 | I1, .-.\r | |
| 148 | JMP% SHIFT1\r | |
| 149 | /\r | |
| 150 | /\r | |
| 151 | SHIFT2, .-. / SHIFT VAR BY I1 POSITIONS TO THE LEFT\r | |
| 152 | TAD VAR+2\r | |
| 153 | JMS SHIFT1\r | |
| 154 | DCA TMP1 / SAVE OVERFLOW\r | |
| 155 | MQA\r | |
| 156 | DCA VAR+2 / STORE THIRD WORD OF RESULT\r | |
| 157 | /\r | |
| 158 | TAD VAR+1\r | |
| 159 | JMS SHIFT1\r | |
| 160 | DCA TMP2 / SAVE OVERFLOW\r | |
| 161 | TAD TMP1\r | |
| 162 | MQA / INSERT OVERFLOW OF WORD # 3\r | |
| 163 | DCA VAR+1 / STORE SECOND WORD OF RESULT\r | |
| 164 | /\r | |
| 165 | \r TAD VAR / SHIFT FIRST WORD\r | |
| 166 | JMS SHIFT1\r | |
| 167 | CLA\r | |
| 168 | TAD TMP2\r | |
| 169 | MQA\r | |
| 170 | DCA VAR\r | |
| 171 | JMP% SHIFT2\r | |
| 172 | /\r | |
| 173 | /\r | |
| 174 | SHIFT3, .-. / LOGICAL SHIFT RIGHT BY I3 BITS\r | |
| 175 | SWP / CLEAR MQ\r | |
| 176 | CLA SWP\r | |
| 177 | LSR\r | |
| 178 | I3, .-.\r | |
| 179 | JMP% SHIFT3\r | |
| 180 | /\r | |
| 181 | /\r | |
| 182 | SHIFT4, .-. / LOGICAL SHIFT RIGHT VAR BY I3 BITS AC & MQ\r | |
| 183 | CAM\r | |
| 184 | TAD VAR\r | |
| 185 | JMS SHIFT3\r | |
| 186 | DCA VAR\r | |
| 187 | ACL\r | |
| 188 | DCA TMP1\r | |
| 189 | /\r | |
| 190 | TAD VAR+1\r | |
| 191 | JMS SHIFT3\r | |
| 192 | SWP\r | |
| 193 | DCA TMP2\r | |
| 194 | TAD TMP1\r | |
| 195 | MQA\r | |
| 196 | DCA VAR+1\r | |
| 197 | /\r | |
| 198 | TAD VAR+2\r | |
| 199 | JMS SHIFT3\r | |
| 200 | MQL\r | |
| 201 | TAD TMP2\r | |
| 202 | MQA\r | |
| 203 | DCA VAR+2\r | |
| 204 | JMP% SHIFT4\r | |
| 205 | END\r | |
| 206 | \1a\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0 |