MOVBE (R32, M32) - 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): Memory

Latency operand 2 → 1 (address, base register): 5

Latency operand 2 → 1 (address, index register): 5

Latency operand 2 → 1 (memory): ≤7

Latency operand 2 → 1 (address, base register): 5

Experiment 1

Instruction: MOVBE R8D, dword ptr [R14]
Chain instructions: MOVSX R8, R8D;XOR R14, R8;XOR R14, R8;XOR R14, R8;XOR R14, R8
Chain latency: 5

Code:

   0:	45 0f 38 f0 06       	movbe  r8d,DWORD PTR [r14]
   5:	4d 63 c0             	movsxd r8,r8d
   8:	4d 31 c6             	xor    r14,r8
   b:	4d 31 c6             	xor    r14,r8
   e:	4d 31 c6             	xor    r14,r8
  11:	4d 31 c6             	xor    r14,r8

Show nanoBench command
Results:
- MPERF: 8.61
- APERF: 9.99
- UOPS: 6.0

Latency operand 2 → 1 (address, index register): 5

Experiment 1

Instruction: MOVBE R8D, dword ptr [R14+R13]
Chain instructions: MOVSX R8, R8D;XOR R13, R8;XOR R13, R8;XOR R13, R8;XOR R13, R8
Chain latency: 5

Code:

   0:	47 0f 38 f0 04 2e    	movbe  r8d,DWORD PTR [r14+r13*1]
   6:	4d 63 c0             	movsxd r8,r8d
   9:	4d 31 c5             	xor    r13,r8
   c:	4d 31 c5             	xor    r13,r8
   f:	4d 31 c5             	xor    r13,r8
  12:	4d 31 c5             	xor    r13,r8

Init:
```
XOR R13, R13
```
Show nanoBench command
Results:
- MPERF: 8.61
- APERF: 9.99
- UOPS: 6.0

Latency operand 2 → 1 (memory): ≤7

Experiment 1

Instruction: MOVBE R8D, dword ptr [R14]
Chain instructions: MOVSX R12, R8D;MOVSX R12, R12d;MOVSX R12, R12d;MOVSX R12, R12d;mov [R14], R12D
Chain latency: ≥5

Code:

   0:	45 0f 38 f0 06       	movbe  r8d,DWORD PTR [r14]
   5:	4d 63 e0             	movsxd r12,r8d
   8:	4d 63 e4             	movsxd r12,r12d
   b:	4d 63 e4             	movsxd r12,r12d
   e:	4d 63 e4             	movsxd r12,r12d
  11:	45 89 26             	mov    DWORD PTR [r14],r12d

Show nanoBench command
Results:
- MPERF: 10.26
- APERF: 11.99
- UOPS: 6.0