MOV_89 (R32, R32) - Latency

Operands

Operand 1 (w): Register (EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI, R8D, R9D, R10D, R11D, R12D, R13D, R14D, R15D)
Operand 2 (r): Register (EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI, R8D, R9D, R10D, R11D, R12D, R13D, R14D, R15D)

Latency operand 2 → 1: 0

Latency operand 2 → 1, with the same register for different operands: 1

Latency operand 2 → 1: 0

Experiment 1

Instruction: {load} MOV R9D, R8D
Chain instructions: MOVSX R8, R9D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
Chain latency: 5

Code:

   0:	45 89 c1             	mov    r9d,r8d
   3:	4d 63 c1             	movsxd r8,r9d
   6:	4d 63 c0             	movsxd r8,r8d
   9:	4d 63 c0             	movsxd r8,r8d
   c:	4d 63 c0             	movsxd r8,r8d
   f:	4d 63 c0             	movsxd r8,r8d

Show nanoBench command
Results:
- Instructions retired: 6.0
- Core cycles: 5.0
- Reference cycles: 4.25
- UOPS_EXECUTED.THREAD: 5.0

Latency operand 2 → 1, with the same register for different operands: 1

Experiment 2 (with the same register for different operands)

Instruction: {load} MOV R8D, R8D

Code:

   0:	45 89 c0             	mov    r8d,r8d

Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 1.0
- Reference cycles: 1.0
- UOPS_EXECUTED.THREAD: 1.0

Experiment 3 (with the same register for different operands)

Instruction: {load} MOV R8D, R8D
Chain instructions: MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
Chain latency: 5

Code:

   0:	45 89 c0             	mov    r8d,r8d
   3:	4d 63 c0             	movsxd r8,r8d
   6:	4d 63 c0             	movsxd r8,r8d
   9:	4d 63 c0             	movsxd r8,r8d
   c:	4d 63 c0             	movsxd r8,r8d
   f:	4d 63 c0             	movsxd r8,r8d

Show nanoBench command
Results:
- Instructions retired: 6.0
- Core cycles: 6.0
- Reference cycles: 4.75
- UOPS_EXECUTED.THREAD: 6.0