CMP (R32, I32) - Latency

Experiment 1

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

     0:	41 81 f8 00 00 00 01 	cmp    r8d,0x1000000
     7:	45 0f 48 ff          	cmovs  r15d,r15d
     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:
  • MPERF: 5.74
  • APERF: 7.0
  • UOPS: 7.0

Experiment 2

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

     0:	41 81 f8 00 00 00 01 	cmp    r8d,0x1000000
     7:	45 0f 4a ff          	cmovp  r15d,r15d
     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:
  • MPERF: 5.67
  • APERF: 7.0
  • UOPS: 7.0

Experiment 3

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

     0:	41 81 f8 00 00 00 01 	cmp    r8d,0x1000000
     7:	45 0f 44 ff          	cmove  r15d,r15d
     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:
  • MPERF: 5.67
  • APERF: 7.0
  • UOPS: 7.0

Experiment 4

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

     0:	41 81 f8 00 00 00 01 	cmp    r8d,0x1000000
     7:	45 0f 40 ff          	cmovo  r15d,r15d
     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:
  • MPERF: 5.74
  • APERF: 7.0
  • UOPS: 7.0

Experiment 5

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

     0:	41 81 f8 00 00 00 01 	cmp    r8d,0x1000000
     7:	45 0f 42 ff          	cmovb  r15d,r15d
     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:
  • MPERF: 5.74
  • APERF: 7.0
  • UOPS: 7.0