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:
  • MPERF: 0.84
  • APERF: 1.0
  • UOPS: 1.0
  • FpuPipeAssignment.Total0: 0.0
  • FpuPipeAssignment.Total1: 0.0
  • FpuPipeAssignment.Total2: 0.0
  • FpuPipeAssignment.Total3: 0.0
  • FpuPipeAssignment.Total4: 0.0
  • FpuPipeAssignment.Total5: 0.0
  • DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=10

• Code:

     0:	04 02                	add    al,0x2
  

• Show nanoBench command
• Results:
  • MPERF: 0.8
  • APERF: 1.0
  • UOPS: 1.1
  • FpuPipeAssignment.Total0: 0.0
  • FpuPipeAssignment.Total1: 0.0
  • FpuPipeAssignment.Total2: 0.0
  • FpuPipeAssignment.Total3: 0.0
  • FpuPipeAssignment.Total4: 0.0
  • FpuPipeAssignment.Total5: 0.0
  • DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=100

• Code:

     0:	04 02                	add    al,0x2
  

• Show nanoBench command
• Results:
  • MPERF: 0.8
  • APERF: 1.0
  • UOPS: 1.01
  • FpuPipeAssignment.Total0: 0.0
  • FpuPipeAssignment.Total1: 0.0
  • FpuPipeAssignment.Total2: 0.0
  • FpuPipeAssignment.Total3: 0.0
  • FpuPipeAssignment.Total4: 0.0
  • FpuPipeAssignment.Total5: 0.0
  • DIV_CYCLES: 0.0

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:
  • MPERF: 0.37
  • APERF: 0.5
  • UOPS: 2.0
  • FpuPipeAssignment.Total0: 0.0
  • FpuPipeAssignment.Total1: 0.0
  • FpuPipeAssignment.Total2: 0.0
  • FpuPipeAssignment.Total3: 0.0
  • FpuPipeAssignment.Total4: 0.0
  • FpuPipeAssignment.Total5: 0.0
  • DIV_CYCLES: 0.0

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:
  • MPERF: 0.28
  • APERF: 0.35
  • UOPS: 2.1
  • FpuPipeAssignment.Total0: 0.0
  • FpuPipeAssignment.Total1: 0.0
  • FpuPipeAssignment.Total2: 0.0
  • FpuPipeAssignment.Total3: 0.0
  • FpuPipeAssignment.Total4: 0.0
  • FpuPipeAssignment.Total5: 0.0
  • DIV_CYCLES: 0.0

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:
  • MPERF: 0.27
  • APERF: 0.34
  • UOPS: 2.01
  • FpuPipeAssignment.Total0: 0.0
  • FpuPipeAssignment.Total1: 0.0
  • FpuPipeAssignment.Total2: 0.0
  • FpuPipeAssignment.Total3: 0.0
  • FpuPipeAssignment.Total4: 0.0
  • FpuPipeAssignment.Total5: 0.0
  • DIV_CYCLES: 0.0