Texas Instruments TMS320C67X/C67X+ DSP Uživatelský manuál Strana 129
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Hodnocené. / 5. Na základě hodnocení zákazníků
Branch Using a Displacement B
3-69 Instruction SetSPRU733
Branch Using a Displacement
B
Syntax B (.unit) label
.unit = .S1 or .S2
Compatibility C62x, C64x, C67x, and C67x+ CPU
Opcode
31 29 28 27 76543210
creg z cst21 0 0 1 0 0 s p
3 1 21 1 1
Opcode map field used... For operand type... Unit
cst21 scst21 .S1, .S2
Description A 21-bit signed constant, cst21, is shifted left by 2 bits and is added to the
address of the first instruction of the fetch packet that contains the branch
instruction. The result is placed in the program fetch counter (PFC). The
assembler/linker automatically computes the correct value for cst21 by the
following formula:
cst21 = (label − PCE1)
>> 2
If two branches are in the same execute packet and both are taken, behavior
is undefined.
Two conditional branches can be in the same execute packet if one branch
uses a displacement and the other uses a register, IRP, or NRP. As long as only
one branch has a true condition, the code executes in a well-defined way.
Execution if (cond) cst21
<< 2 + PCE1 → PFC
else nop
Notes:
1) PCE1 (program counter) represents the address of the first instruction
in the fetch packet in the E1 stage of the pipeline. PFC is the program
fetch counter.
2) The execute packets in the delay slots of a branch cannot be interrupted.
This is true regardless of whether the branch is taken.
3) See section 3.5.2 on page 3-18 for information on branching into the
middle of an execute packet.
- TMS320C67x/C67x+ DSP 1
- CPU and Instruction Set 1
- Reference Guide 1
- Read This First 3
- Trademarks 4
- Contents 10
- Examples 17
- CPU Data Paths and Control 27
- 2.1 Introduction 28
- Data path A 29
- Data path B 29
- 2.4 Register File Cross Paths 32
- 2.6 Data Address Paths 33
- 2.7 Control Register File 33
- Control Register File 45
- Field Descriptions 50
- Instruction Set 61
- 3-9Instruction SetSPRU733 69
- (e−1023) 73
- 3.4 Delay Slots 74
- 3.5 Parallel Operations 76
- 3.5.1 Example Parallel Code 78
- 3.6 Conditional Operations 79
- 3.7 Resource Constraints 80
- Resource Constraints 81
- 3-21Instruction SetSPRU733 81
- Instruction Set3-22 SPRU733 82
- 3-23Instruction SetSPRU733 83
- Instruction Set3-24 SPRU733 84
- 3-25Instruction SetSPRU733 85
- Instruction Set3-26 SPRU733 86
- 3-27Instruction SetSPRU733 87
- Instruction Set3-28 SPRU733 88
- 3.8 Addressing Modes 90
- Addressing Modes 91
- 3-31Instruction SetSPRU733 91
- LDW .D1 *++A4[9],A1 91
- Instruction Set3-32 SPRU733 92
- ADDAH .D1 A4,A1,A4 92
- 3.9 Instruction Compatibility 94
- 3.10 Instruction Descriptions 94
- 3-35 Instruction SetSPRU733 95
- 3-37 Instruction SetSPRU733 97
- 3 1 5 5 1 1 1 100
- 3 1 5 5 5 1 7 1 1 104
- 3 1 5 5 5 6 1 1 106
- 31 29 28 27 23 22 76543210 119
- 3 1 5 16 1 1 119
- 3 1 5 5 5 1 1 1 125
- Bitwise AND 127
- AND Bitwise AND 128
- Branch Using a Displacement 129
- B Branch Using a Displacement 130
- Branch Using a Register 131
- B Branch Using a Register 132
- 3-73 Instruction SetSPRU733 133
- Instruction Type Branch 134
- Delay Slots 5 134
- Pipeline 134
- 3-75 Instruction SetSPRU733 135
- Clear a Bit Field 137
- CLR Clear a Bit Field 138
- Example 1 CLR .S1 A1,4,19,A2 139
- Example 2 CLR .S2 B1,B3,B2 139
- .unit = .L1 or .L2 146
- > src2) 1 → dst 147
- Example 1 CMPGT .L1X A1,B1,A2 148
- Example 2 CMPGT .L1X A1,B1,A2 148
- Example 3 CMPGT .L1 8,A1,A2 148
- Example 4 CMPGT .L1X A1,B1,A2 148
- Unsigned 32-bit integer 154
- < src2) 1 → dst 156
- Example 1 CMPLT .L1 A1,A2,A3 157
- Example 2 CMPLT .L1 A1,A2,A3 157
- Example 3 CMPLT .L1 9,A1,A2 157
- Floating-Point Value 166
- With Truncation 168
- 3 1 5 5 5 5 1 1 170
- Instruction Type Single-cycle 172
- Delay Slots 0 172
- See Also EXTU 172
- Example 1 EXT .S1 A1,10,19,A2 172
- Example 2 EXT .S1 A1,A2,A3 172
- See Also EXT 175
- Example 2 EXTU .S1 A1,A2,A3 175
- Example INTDPU .L1 A4,A1:A0 180
- Register Offset 183
- Example LDB .D1 *−A5[4],A7 185
- 3 1 5 15 1 3 1 1 186
- 3 1 5 5 5 4 1 1 1 188
- 3 1 5 5 5 4 1 3 1 1 191
- Example LDH .D1 *++A4[A1],A8 193
- Example 1 LDW .D1 *A10,B1 198
- Example 2 LDW .D1 *A4++[1],A6 198
- Example 3 LDW .D1 *++A4[1],A6 198
- 3-139 Instruction SetSPRU733 199
- Instruction Type Load 200
- Delay Slots 4 200
- See Also LDB, LDH 200
- Leftmost Bit Detection 201
- LMBD Leftmost Bit Detection 202
- Signed 16 LSB 203
- Example 1 MPY .M1 A1,A2,A3 204
- Example 2 MPY .M1 13,A1,A2 204
- Signed 16 MSB 207
- Example MPYH .M1 A1,A2,A3 208
- Example MPYHL .M1 A1,A2,A3 210
- Unsigned 16 LSB 211
- Unsigned 16 MSB 213
- 32-Bit Into 32-Bit Result 217
- Functional Unit 218
- See Also MPYID 218
- 32-Bit Into 64-Bit Result 219
- See Also MPYI 220
- Example MPYLH .M1 A1,A2,A3 222
- Double-Precision 228
- Double-Precision Result 230
- MPYSP2DP 230
- See Also MPY, MPYU, MPYUS 233
- Example MPYU .M1 A1,A2,A3 235
- Example MPYUS .M1 A1,A2,A3 237
- Syntax MV (.unit) src2, dst 238
- Opcode .L unit 238
- Opcode .S unit 238
- 3 1 5 5 1 1 239
- 3 1 5 5 1 6 1 1 240
- MVK .S1 0x00008000X, A0 243
- MVK .S1 0xFFFF8000, A0 243
- Instruction Type Single cycle 244
- See Also MVKH, MVKL, MVKLH 244
- Example 1 244
- Example 2 MVK .D2 14,B8 244
- MVKH/MVKLH 245
- MVKL 0x12345678 246
- MVKH 0x12345678 246
- MVKL label 246
- MVKH label 246
- 31 29 28 27 23 22 7 6543210 247
- 3 1 5 5 1 7 1 1 249
- NOP No Operation 250
- No Operation 250
- Example 1 NOP 251
- Example 2 MVK .S1 1,A1 251
- NORM Normalize Integer 252
- Normalize Integer 252
- NOT Bitwise NOT 254
- Bitwise NOT 254
- Bitwise OR 255
- OR Bitwise OR 256
- 3-207 Instruction SetSPRU733 267
- SADD .L1X B2,A5:A4,A7:A6 267
- 2 cycles after instruction 267
- SET Set a Bit Field 270
- Set a Bit Field 270
- Arithmetic Shift Left 273
- SHL Arithmetic Shift Left 274
- Arithmetic Shift Right 275
- SHR Arithmetic Shift Right 276
- Logical Shift Right 277
- SHRU Logical Shift Right 278
- src2) << 1) → dst 279
- Example SMPY .M1 A1,A2,A3 280
- Example SMPYHL .M1 A1,A2,A3 283
- Example SMPYLH .M1 A1,A2,A3 285
- Shift Left With Saturation 292
- 02E3 031Ch 293
- Written baseR 297
- 31 29 28 27 23 22 876 43210 298
- 3 1 5 15 1 1 1 298
- 3-243 Instruction SetSPRU733 303
- /B15, src 304
- Instruction Type Store 304
- See Also STB, STW 304
- 3-247 Instruction SetSPRU733 307
- See Also STB, STH 308
- 3 1 5 5 5 1 6 1 1 310
- Example SUBAW .D1 A5,2,A3 317
- << 1) + 1 → dst 318
- << 1 → dst 318
- Example 1 SUBC .L1 A0,A1,A0 319
- Example 2 SUBC .L1 A0,A1,A0 319
- XOR Bitwise Exclusive OR 330
- Bitwise Exclusive OR 330
- ZERO Zero a Register 332
- Zero a Register 332
- Figure 4−1. Pipeline Stages 334
- 4.1.1 Fetch 334
- 4.1.2 Decode 335
- 4.1.3 Execute 337
- Figure 4−5. Pipeline Phases 338
- 4.2.3 Store Instructions 350
- Written baseR dst 352
- LDW .D1 *A4++,A3 353
- 4.2.5 Branch Instructions 354
- 4.2.7 Four-Cycle Instructions 357
- 4.2.8 INTDP Instruction 358
- 4.2.9 DP Compare Instructions 359
- 4.2.11 MPYI Instruction 361
- 4.2.12 MPYID Instruction 362
- 4.2.13 MPYDP Instruction 363
- 4.2.14 MPYSPDP Instruction 364
- 4.2.15 MPYSP2DP Instruction 365
- 4.3.1 .S-Unit Constraints 366
- 4.3.2 .M-Unit Constraints 372
- 4.3.3 .L-Unit Constraints 380
- Performance Considerations 388
- Pipeline4-56 SPRU733 388
- 4.4.2 Multicycle NOPs 390
- Delay slots of the branch 391
- 4.4.3 Memory Considerations 392
- Program DC E1 E2 E3 393
- Pipeline4-62 SPRU733 394
- Interrupts 396
- 5.1 Overview 397
- Overview 400
- 5-5InterruptsSPRU733 400
- Interrupts5-6 SPRU733 401
- 5-7InterruptsSPRU733 402
- Located Outside the IST 403
- 5-11InterruptsSPRU733 406
- 5.3.2 Status of Interrupts 409
- 5-17InterruptsSPRU733 412
- If an execute 413
- 5-19InterruptsSPRU733 414
- 5.5.1 General Performance 416
- 5.5.2 Pipeline Interaction 416
- 5.6.2 Nested Interrupts 418
- 5.6.4 Traps 421
- Instruction Compatibility 422
- 3-126 424
- 3-134 424
- 3-139 424
- 3-238 426
- 3-243 426
- 3-247 426
- Appendix A 434
- Appendix C 434
- register offset 436
- mode r y op 1 0 s p 438
- y op 1 1 s p 438
- Appendix D 439
- D.3 32-Bit Opcode Maps 442
- Appendix E 443
- E.3 32-Bit Opcode Maps 446
- Appendix F 447
- F.3 32-Bit Opcode Maps 450
- Appendix G 452
- G.3 32-Bit Opcode Maps 454
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