ADD (AL, I8) - Throughput and Uops

With unroll_count=500 and no inner loop

• Code:

     0:	04 02                	add    al,0x2
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.0
  • Core cycles: 1.0
  • Reference cycles: 1.01
  • RS_UOPS_DISPATCHED: 1.0
  • UOPS_PORT_0: 0.34
  • UOPS_PORT_1: 0.34
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 0.33

With loop_count=1000 and unroll_count=10

• Code:

     0:	04 02                	add    al,0x2
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.2
  • Core cycles: 1.05
  • Reference cycles: 1.05
  • RS_UOPS_DISPATCHED: 1.2
  • UOPS_PORT_0: 0.41
  • UOPS_PORT_1: 0.34
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 0.44

With loop_count=100 and unroll_count=100

• Code:

     0:	04 02                	add    al,0x2
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.02
  • Core cycles: 1.0
  • Reference cycles: 1.0
  • RS_UOPS_DISPATCHED: 1.02
  • UOPS_PORT_0: 0.34
  • UOPS_PORT_1: 0.34
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 0.34

With additional dependency-breaking instructions

With unroll_count=500 and no inner loop

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	04 02                	add    al,0x2
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 0.66
  • Reference cycles: 0.66
  • RS_UOPS_DISPATCHED: 2.0
  • UOPS_PORT_0: 0.66
  • UOPS_PORT_1: 0.67
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 0.67

With loop_count=1000 and unroll_count=10

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	04 02                	add    al,0x2
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.2
  • Core cycles: 0.73
  • Reference cycles: 0.73
  • RS_UOPS_DISPATCHED: 2.2
  • UOPS_PORT_0: 0.73
  • UOPS_PORT_1: 0.73
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 0.73

With loop_count=100 and unroll_count=100

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	04 02                	add    al,0x2
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.02
  • Core cycles: 0.68
  • Reference cycles: 0.68
  • RS_UOPS_DISPATCHED: 2.02
  • UOPS_PORT_0: 0.67
  • UOPS_PORT_1: 0.67
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 0.67