PUSH (R64) - Latency

Experiment 1

• Instruction: PUSH R8
• Chain instructions: MOV R8, [RSP];MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
• Chain latency: ≥5
• Code:

     0:	41 50                	push   r8
     2:	4c 8b 04 24          	mov    r8,QWORD PTR [rsp]
     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: 7.0
  • Reference cycles: 5.35
  • UOPS_EXECUTED.THREAD: 8.0

Experiment 1 (with R8=0)

• Instruction: PUSH R8
• Chain instructions: MOV R12, [RSP];MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;XOR RSP, R12; XOR RSP, R12
• Chain latency: ≥7
• Code:

     0:	41 50                	push   r8
     2:	4c 8b 24 24          	mov    r12,QWORD PTR [rsp]
     6:	4d 63 e4             	movsxd r12,r12d
     9:	4d 63 e4             	movsxd r12,r12d
     c:	4d 63 e4             	movsxd r12,r12d
     f:	4d 63 e4             	movsxd r12,r12d
    12:	4c 31 e4             	xor    rsp,r12
    15:	4c 31 e4             	xor    rsp,r12
  

• Init:

  MOV R8, 0

• Show nanoBench command
• Results:
  • Instructions retired: 8.0
  • Core cycles: 18.0
  • Reference cycles: 14.36
  • UOPS_EXECUTED.THREAD: 9.99

Experiment 2 (with R8=1)

• Instruction: PUSH R8
• Chain instructions: MOV R12, [RSP];MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;XOR RSP, R12; XOR RSP, R12
• Chain latency: ≥7
• Code:

     0:	41 50                	push   r8
     2:	4c 8b 24 24          	mov    r12,QWORD PTR [rsp]
     6:	4d 63 e4             	movsxd r12,r12d
     9:	4d 63 e4             	movsxd r12,r12d
     c:	4d 63 e4             	movsxd r12,r12d
     f:	4d 63 e4             	movsxd r12,r12d
    12:	4c 31 e4             	xor    rsp,r12
    15:	4c 31 e4             	xor    rsp,r12
  

• Init:

  MOV R8, 1

• Show nanoBench command
• Results:
  • Instructions retired: 8.0
  • Core cycles: 18.0
  • Reference cycles: 15.09
  • UOPS_EXECUTED.THREAD: 9.99

Experiment 3 (with R8=2)

• Instruction: PUSH R8
• Chain instructions: MOV R12, [RSP];MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;XOR RSP, R12; XOR RSP, R12
• Chain latency: ≥7
• Code:

     0:	41 50                	push   r8
     2:	4c 8b 24 24          	mov    r12,QWORD PTR [rsp]
     6:	4d 63 e4             	movsxd r12,r12d
     9:	4d 63 e4             	movsxd r12,r12d
     c:	4d 63 e4             	movsxd r12,r12d
     f:	4d 63 e4             	movsxd r12,r12d
    12:	4c 31 e4             	xor    rsp,r12
    15:	4c 31 e4             	xor    rsp,r12
  

• Init:

  MOV R8, 2

• Show nanoBench command
• Results:
  • Instructions retired: 8.0
  • Core cycles: 18.0
  • Reference cycles: 14.36
  • UOPS_EXECUTED.THREAD: 9.99

Experiment 4 (with additional nop, with R8=0)

• Instruction: PUSH R8
• Chain instructions: MOV R12, [RSP];MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;XOR RSP, R12; XOR RSP, R12;nop
• Chain latency: ≥7
• Code:

     0:	41 50                	push   r8
     2:	4c 8b 24 24          	mov    r12,QWORD PTR [rsp]
     6:	4d 63 e4             	movsxd r12,r12d
     9:	4d 63 e4             	movsxd r12,r12d
     c:	4d 63 e4             	movsxd r12,r12d
     f:	4d 63 e4             	movsxd r12,r12d
    12:	4c 31 e4             	xor    rsp,r12
    15:	4c 31 e4             	xor    rsp,r12
    18:	90                   	nop
  

• Init:

  MOV R8, 0

• Show nanoBench command
• Results:
  • Instructions retired: 9.0
  • Core cycles: 17.99
  • Reference cycles: 14.84
  • UOPS_EXECUTED.THREAD: 9.99

Experiment 5 (with additional nop, with R8=1)

• Instruction: PUSH R8
• Chain instructions: MOV R12, [RSP];MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;XOR RSP, R12; XOR RSP, R12;nop
• Chain latency: ≥7
• Code:

     0:	41 50                	push   r8
     2:	4c 8b 24 24          	mov    r12,QWORD PTR [rsp]
     6:	4d 63 e4             	movsxd r12,r12d
     9:	4d 63 e4             	movsxd r12,r12d
     c:	4d 63 e4             	movsxd r12,r12d
     f:	4d 63 e4             	movsxd r12,r12d
    12:	4c 31 e4             	xor    rsp,r12
    15:	4c 31 e4             	xor    rsp,r12
    18:	90                   	nop
  

• Init:

  MOV R8, 1

• Show nanoBench command
• Results:
  • Instructions retired: 9.0
  • Core cycles: 17.99
  • Reference cycles: 14.84
  • UOPS_EXECUTED.THREAD: 9.99

Experiment 6 (with additional nop, with R8=2)

• Instruction: PUSH R8
• Chain instructions: MOV R12, [RSP];MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;MOVSX R12, R12D;XOR RSP, R12; XOR RSP, R12;nop
• Chain latency: ≥7
• Code:

     0:	41 50                	push   r8
     2:	4c 8b 24 24          	mov    r12,QWORD PTR [rsp]
     6:	4d 63 e4             	movsxd r12,r12d
     9:	4d 63 e4             	movsxd r12,r12d
     c:	4d 63 e4             	movsxd r12,r12d
     f:	4d 63 e4             	movsxd r12,r12d
    12:	4c 31 e4             	xor    rsp,r12
    15:	4c 31 e4             	xor    rsp,r12
    18:	90                   	nop
  

• Init:

  MOV R8, 2

• Show nanoBench command
• Results:
  • Instructions retired: 9.0
  • Core cycles: 17.99
  • Reference cycles: 14.11
  • UOPS_EXECUTED.THREAD: 9.99