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Instruction Dispatch and Execution Resources 193
22007E/0—November 1999 AMD Athlon™ Processor x86 Code Optimization
CMP EAX, imm16/32 3Dh DirectPath
CMP mreg8, imm8 80h 11-111-xxx DirectPath
CMP mem8, imm8 80h mm-111-xxx DirectPath
CMP mreg16/32, imm16/32 81h 11-111-xxx DirectPath
CMP mem16/32, imm16/32 81h mm-111-xxx DirectPath
CMP mreg16/32, imm8 (sign extended) 83h 11-111-xxx DirectPath
CMP mem16/32, imm8 (sign extended) 83h mm-111-xxx DirectPath
CMPSB mem8,mem8 A6h VectorPath
CMPSW mem16, mem32 A7h VectorPath
CMPSD mem32, mem32 A7h VectorPath
CMPXCHG mreg8, reg8 0Fh B0h 11-xxx-xxx VectorPath
CMPXCHG mem8, reg8 0Fh B0h mm-xxx-xxx VectorPath
CMPXCHG mreg16/32, reg16/32 0Fh B1h 11-xxx-xxx VectorPath
CMPXCHG mem16/32, reg16/32 0Fh B1h mm-xxx-xxx VectorPath
CMPXCHG8B mem64 0Fh C7h mm-xxx-xxx VectorPath
CPUID 0Fh A2h VectorPath
CWD/CDQ 99h DirectPath
DAA 27h VectorPath
DAS 2Fh VectorPath
DEC EAX 48h DirectPath
DEC ECX 49h DirectPath
DEC EDX 4Ah DirectPath
DEC EBX 4Bh DirectPath
DEC ESP 4Ch DirectPath
DEC EBP 4Dh DirectPath
DEC ESI 4Eh DirectPath
DEC EDI 4Fh DirectPath
DEC mreg8 FEh 11-001-xxx DirectPath
DEC mem8 FEh mm-001-xxx DirectPath
DEC mreg16/32 FFh 11-001-xxx DirectPath
DEC mem16/32 FFh mm-001-xxx DirectPath
DIV AL, mreg8 F6h 11-110-xxx VectorPath
DIV AL, mem8 F6h mm-110-xxx VectorPath
Table 19. Integer Instructions (Continued)
Instruction Mnemonic
First
Byte
Second
Byte
ModR/M
Byte
Decode
Type