CMP (R64, I32) - Latency

Experiment 1

• Instruction: CMP R8, 16777216
• Chain instructions: CMOVO R15, R15;MOVSX R8, R15D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
• Chain latency: 6
• Code:

     0:	49 81 f8 00 00 00 01 	cmp    r8,0x1000000
     7:	4d 0f 40 ff          	cmovo  r15,r15
     b:	4d 63 c7             	movsxd r8,r15d
     e:	4d 63 c0             	movsxd r8,r8d
    11:	4d 63 c0             	movsxd r8,r8d
    14:	4d 63 c0             	movsxd r8,r8d
    17:	4d 63 c0             	movsxd r8,r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 7.0
  • Core cycles: 7.0
  • Reference cycles: 5.35
  • UOPS_EXECUTED.THREAD: 7.0

Experiment 2

• Instruction: CMP R8, 16777216
• Chain instructions: CMOVS R15, R15;MOVSX R8, R15D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
• Chain latency: 6
• Code:

     0:	49 81 f8 00 00 00 01 	cmp    r8,0x1000000
     7:	4d 0f 48 ff          	cmovs  r15,r15
     b:	4d 63 c7             	movsxd r8,r15d
     e:	4d 63 c0             	movsxd r8,r8d
    11:	4d 63 c0             	movsxd r8,r8d
    14:	4d 63 c0             	movsxd r8,r8d
    17:	4d 63 c0             	movsxd r8,r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 7.0
  • Core cycles: 7.0
  • Reference cycles: 5.35
  • UOPS_EXECUTED.THREAD: 7.0

Experiment 3

• Instruction: CMP R8, 16777216
• Chain instructions: CMOVC R15, R15;MOVSX R8, R15D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
• Chain latency: 6
• Code:

     0:	49 81 f8 00 00 00 01 	cmp    r8,0x1000000
     7:	4d 0f 42 ff          	cmovb  r15,r15
     b:	4d 63 c7             	movsxd r8,r15d
     e:	4d 63 c0             	movsxd r8,r8d
    11:	4d 63 c0             	movsxd r8,r8d
    14:	4d 63 c0             	movsxd r8,r8d
    17:	4d 63 c0             	movsxd r8,r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 7.0
  • Core cycles: 7.0
  • Reference cycles: 5.11
  • UOPS_EXECUTED.THREAD: 7.0

Experiment 4

• Instruction: CMP R8, 16777216
• Chain instructions: CMOVP R15, R15;MOVSX R8, R15D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
• Chain latency: 6
• Code:

     0:	49 81 f8 00 00 00 01 	cmp    r8,0x1000000
     7:	4d 0f 4a ff          	cmovp  r15,r15
     b:	4d 63 c7             	movsxd r8,r15d
     e:	4d 63 c0             	movsxd r8,r8d
    11:	4d 63 c0             	movsxd r8,r8d
    14:	4d 63 c0             	movsxd r8,r8d
    17:	4d 63 c0             	movsxd r8,r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 7.0
  • Core cycles: 7.0
  • Reference cycles: 5.6
  • UOPS_EXECUTED.THREAD: 7.0

Experiment 5

• Instruction: CMP R8, 16777216
• Chain instructions: CMOVZ R15, R15;MOVSX R8, R15D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
• Chain latency: 6
• Code:

     0:	49 81 f8 00 00 00 01 	cmp    r8,0x1000000
     7:	4d 0f 44 ff          	cmove  r15,r15
     b:	4d 63 c7             	movsxd r8,r15d
     e:	4d 63 c0             	movsxd r8,r8d
    11:	4d 63 c0             	movsxd r8,r8d
    14:	4d 63 c0             	movsxd r8,r8d
    17:	4d 63 c0             	movsxd r8,r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 7.0
  • Core cycles: 7.0
  • Reference cycles: 5.84
  • UOPS_EXECUTED.THREAD: 7.0