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3-106 Vol. 2A CLC—Clear Carry Flag
INSTRUCTION SET REFERENCE, A-M
CLC—Clear Carry Flag
Description
Clears the CF flag in the EFLAGS register. Operation is the same in all non-64-bit
modes and 64-bit mode.
Operation
CF ← 0;
Flags Affected
The CF flag is set to 0. The OF, ZF, SF, AF, and PF flags are unaffected.
Exceptions (All Operating Modes)
#UD If the LOCK prefix is used.
Opcode Instruction 64-Bit
Mode
Compat/
Leg Mode
Description
F8 CLC Valid Valid Clear CF flag.
- Software Developer’s Manual 1
- Vol. 2A v 5
- Vol. 2A vii 7
- Vol. 2A ix 9
- Vol. 2A xi 11
- Vol. 2A xiii 13
- Vol. 2A xv 15
- Vol. 2A xvii 17
- Vol. 2A xix 19
- CONTENTS 20
- CHAPTER 1 21
- ABOUT THIS MANUAL 21
- 1-2 Vol. 2A 22
- 1.3 NOTATIONAL CONVENTIONS 23
- 1.3.1 Bit and Byte Order 24
- 1.3.3 Instruction Operands 26
- 1.3.5 Segmented Addressing 26
- 1.3.6 Exceptions 27
- 1.4 RELATED LITERATURE 28
- Vol. 2A 1-9 29
- 1-10 Vol. 2A 30
- CHAPTER 2 31
- INSTRUCTION FORMAT 31
- • Group 2 32
- • Group 3 32
- • Group 4 32
- 2.1.2 Opcodes 33
- 2.1.3 ModR/M and SIB Bytes 34
- Vol. 2A 2-5 35
- 2-6 Vol. 2A 36
- Vol. 2A 2-7 37
- 2-8 Vol. 2A 38
- 2.2.1 REX Prefixes 39
- 2.2.1.1 Encoding 40
- 5UUU %EEE 41
- 2-12 Vol. 2A 42
- 2.2.1.3 Displacement 43
- 2.2.1.5 Immediates 44
- • Near branches 45
- CHAPTER 3 47
- 3-2 Vol. 2A 48
- 3-4 Vol. 2A 50
- Vol. 2A 3-5 51
- 3-6 Vol. 2A 52
- 3.1.1.7 Operation Section 53
- 3-8 Vol. 2A 54
- Vol. 2A 3-9 55
- 3-10 Vol. 2A 56
- Vol. 2A 3-11 57
- Intrinsics API 58
- Technology Intrinsics 58
- Vol. 2A 3-13 59
- 3-14 Vol. 2A 60
- Vol. 2A 3-15 61
- 3-16 Vol. 2A 62
- Vol. 2A 3-17 63
- 3.2 INSTRUCTIONS (A-M) 64
- ADC—Add with Carry 73
- Vol. 2A 3-35 81
- Vol. 2A 3-39 85
- Vol. 2A 3-41 87
- xmm2/m128[63:0]; 92
- AND—Logical AND 99
- Description 100
- Operation 100
- Flags Affected 100
- Protected Mode Exceptions 100
- Real-Address Mode Exceptions 100
- Virtual-8086 Mode Exceptions 101
- Compatibility Mode Exceptions 101
- 64-Bit Mode Exceptions 101
- Point Values 102
- Floating-Point Values 106
- Vol. 2A 3-65 111
- BSF—Bit Scan Forward 115
- BSR—Bit Scan Reverse 117
- BSWAP—Byte Swap 119
- BT—Bit Test 121
- BTC—Bit Test and Complement 124
- BTR—Bit Test and Reset 127
- BTS—Bit Test and Set 130
- CALL—Call Procedure 133
- Vol. 2A 3-89 135
- Vol. 2A 3-91 137
- -byte call gate 138
- = 16 *) 140
- Vol. 2A 3-95 141
- ≠ CPL) 142
- Vol. 2A 3-97 143
- ≠ DPL of code segment 144
- Vol. 2A 3-99 145
- Vol. 2A 3-105 151
- CLC—Clear Carry Flag 152
- CLD—Clear Direction Flag 153
- CLFLUSH—Flush Cache Line 154
- Vol. 2A 3-109 155
- CLI — Clear Interrupt Flag 156
- Vol. 2A 3-111 157
- < 3) AND (VME = 1) 157
- Vol. 2A 3-113 159
- CMC—Complement Carry Flag 161
- CMOVcc—Conditional Move 162
- Vol. 2A 3-117 163
- Vol. 2A 3-119 165
- CMP—Compare Two Operands 169
- Vol. 2A 3-127 173
- Vol. 2A 3-135 181
- Vol. 2A 3-139 185
- CMPXCHG—Compare and Exchange 196
- Values and Set EFLAGS 202
- CPUID—CPU Identification 208
- Vol. 2A 3-163 209
- Vol. 2A 3-165 211
- Vol. 2A 3-167 213
- • Model — 1111B 215
- • Family — 0101B 215
- • Processor Type — 00B 215
- Processor 01B 216
- Vol. 2A 3-171 217
- OM16524b 218
- Vol. 2A 3-173 219
- ('; 220
- Vol. 2A 3-175 221
- Vol. 2A 3-177 223
- Vol. 2A 3-179 225
- -μop, 8-way set associative 226
- Vol. 2A 3-181 227
- How Brand Strings Work 228
- Vol. 2A 3-183 229
- III Xeon 230
- Vol. 2A 3-187 233
- Vol. 2A 3-189 235
- Packed Doubleword Integers 241
- Vol. 2A 3-197 243
- Vol. 2A 3-215 261
- Doubleword Integer 265
- Floating-Point Value 271
- Vol. 2A 3-233 279
- Vol. 2A 3-245 291
- Quadword 301
- Vol. 2A 3-257 303
- > 9) or AF = 1) 303
- Vol. 2A 3-259 305
- DEC—Decrement by 1 307
- Vol. 2A 3-263 309
- DIV—Unsigned Divide 310
- Table 3-20. DIV Action 311
- Vol. 2A 3-271 317
- Vol. 2A 3-273 319
- Vol. 2A 3-279 325
- ELSE IF StackSize = 32 329
- ELSE (* StackSize = 16 *) 329
- 1 to (NestingLevel - 1) 329
- F2XM1—Compute 2 332
- FABS—Absolute Value 334
- FADD/FADDP/FIADD—Add 336
- = FADDP 337
- FPU Flags Affected 338
- Floating-Point Exceptions 338
- Table 3-24. FBSTP Results 342
- FCHS—Change Sign 345
- FCLEX/FNCLEX—Clear Exceptions 347
- Set EFLAGS 355
- Vol. 2A 3-311 357
- FCOS—Cosine 358
- Vol. 2A 3-313 359
- FDIV/FDIVP/FIDIV—Divide 362
- Vol. 2A 3-317 363
- = FDIVP 364
- = FIDIVR 367
- = FDIVRP 368
- FICOM/FICOMP—Compare Integer 371
- = FICOMP 372
- FILD—Load Integer 374
- Vol. 2A 3-333 379
- FIST/FISTP—Store Integer 380
- = FISTP 381
- ← not roundup; 1 ← roundup 381
- Vol. 2A 3-337 383
- Numeric Exceptions 385
- Real Address Mode Exceptions 385
- Virtual 8086 Mode Exceptions 385
- FLD—Load Floating Point Value 387
- Vol. 2A 3-345 391
- FMUL/FMULP/FIMUL—Multiply 397
- = FMULP 398
- FNOP—No Operation 401
- FPATAN—Partial Arctangent 402
- Vol. 2A 3-357 403
- FPREM—Partial Remainder 405
- Vol. 2A 3-361 407
- FPREM1—Partial Remainder 408
- FPTAN—Partial Tangent 411
- FRNDINT—Round to Integer 414
- FRSTOR—Restore x87 FPU State 416
- FSCALE—Scale 423
- 3-378 Vol. 2A FSCALE—Scale 424
- FSIN—Sine 425
- 3-380 Vol. 2A FSIN—Sine 426
- FSINCOS—Sine and Cosine 427
- FSQRT—Square Root 430
- Vol. 2A 3-391 437
- Vol. 2A 3-393 439
- FSUB/FSUBP/FISUB—Subtract 444
- = result) 445
- − DEST; FI; 449
- FSUBRP 450
- FTST—TEST 452
- = SRC: C3, C2, C0 ← 100; 455
- = FUCOMP 455
- = FUCOMPP 455
- FXAM—ExamineModR/M 457
- Non-64-Bit Mode Operation 464
- Memory Region 464
- Memory Region (Contd.) 465
- Vol. 2A 3-421 467
- IA-32e Mode Operation 469
- Default OperandSize 470
- Default OperandSize (Contd.) 471
- Implementation Note 474
- FYL2X—Compute y ∗ log 477
- FYL2XP1—Compute y ∗ log 479
- Exceptions 486
- HLT—Halt 489
- − xmm1[127:64]; 492
- − xmm2/m128[127:64]; 492
- If the LOCK prefix is used 494
- − xmm1[63:32]; 496
- −xmm1[127:96]; 496
- − xmm2/m128[63:32]; 496
- − xmm2/m128[127:96]; 496
- IDIV—Signed Divide 499
- = 8 (* Word/byte operation *) 500
- IMUL—Signed Multiply 503
- IN—Input from Port 508
- Vol. 2A 3-463 509
- INC—Increment by 1 510
- Table 3-56. Decision Table 518
- = 1, task gate *) 520
- Vol. 2A 3-475 521
- Vol. 2A 3-477 523
- ≠ DPL of code segment 525
- = 0; FI; 525
- Vol. 2A 3-485 531
- INVLPG—Invalidate TLB Entry 534
- IRET/IRETD—Interrupt Return 536
- Vol. 2A 3-493 539
- Vol. 2A 3-495 541
- Vol. 2A 3-497 543
- Jcc—Jump if Condition Is Met 547
- Vol. 2A 3-503 549
- JMP—Jump 554
- Vol. 2A 3-509 555
- • A task switch 556
- 3-512 Vol. 2A JMP—Jump 558
- Vol. 2A 3-513 559
- 3-514 Vol. 2A JMP—Jump 560
- Vol. 2A 3-517 563
- LAR—Load Access Rights Byte 566
- ≠ conforming code segment 568
- Implementation Notes 570
- LDMXCSR—Load MXCSR Register 573
- = NULL and ( (RPL = 3) or 576
- ≠ 3 and RPL ≠ CPL) ) 576
- Vol. 2A 3-531 577
- LEA—Load Effective Address 581
- = 16 and AddressSize = 16 582
- = 16 and AddressSize = 32 582
- = 32 and AddressSize = 16 582
- = 32 and AddressSize = 32 582
- = 16 and AddressSize = 64 582
- = 32 and AddressSize = 64 583
- = 64 and AddressSize = 64 583
- Vol. 2A 3-539 585
- LFENCE—Load Fence 586
- Vol. 2A 3-545 591
- LMSW—Load Machine Status Word 593
- LSL—Load Segment Limit 604
- = 64 (* REX.W used *) 606
- LTR—Load Task Register 608
- Vol. 2A 3-563 609
- Vol. 2A 3-569 615
- > SRC[31:0]); FI; 620
- > SRC[127:96]) 620
- = SNaN) 623
- = SNaN) THEN SRC[31:0]; FI; 626
- MFENCE—Memory Fence 629
- < SRC[63:0]) 630
- > SRC[31:0]) 633
- < SRC[127:96]) 633
- = SNaN) THEN SRC[63:0]; FI; 636
- Vol. 2A 3-597 643
- MOV—Move 645
- Vol. 2A 3-609 655
- #UD If CR0.EM[bit 2] = 1 658
- If CR4.OSFXSR[bit 9] = 0 658
- Vol. 2A 3-619 665
- Vol. 2A 3-637 683
- #UD If CR0.EM[bit 2] = 1 697
- Non-Temporal Hint 700
- MOVQ—Move Quadword 709
- String to String 714
- MOVZX—Move with Zero-Extend 739
- MUL—Unsigned Multiply 741
- Vol. 2A 3-701 747
- Vol. 2A 3-703 749
- Vol. 2A 3-707 753
- Vol. 2A 3-709 755
- MWAIT—Monitor Wait 756
- MWAIT for Power Management 757
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