ADC (AL, 0) - Throughput and Uops

With unroll_count=500 and no inner loop

• Code:

     0:	14 00                	adc    al,0x0
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.0
  • Core cycles: 2.0
  • Reference cycles: 1.85
  • UOPS_RETIRED.ANY: 2.0
  • RETIRE_SLOTS: 2.0
  • UOPS_MS: 0.0
  • UOPS_PORT_0: 0.61
  • UOPS_PORT_1: 0.7
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 2.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • INST_DECODED.DEC0: 1.0

With loop_count=1000 and unroll_count=10

• Code:

     0:	14 00                	adc    al,0x0
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.2
  • Core cycles: 2.7
  • Reference cycles: 2.49
  • UOPS_RETIRED.ANY: 2.2
  • RETIRE_SLOTS: 2.2
  • UOPS_MS: 0.0
  • UOPS_PORT_0: 0.5
  • UOPS_PORT_1: 0.8
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 2.7
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • INST_DECODED.DEC0: 0.01

With loop_count=100 and unroll_count=100

• Code:

     0:	14 00                	adc    al,0x0
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.02
  • Core cycles: 2.07
  • Reference cycles: 1.91
  • UOPS_RETIRED.ANY: 2.02
  • RETIRE_SLOTS: 2.02
  • UOPS_MS: 0.0
  • UOPS_PORT_0: 0.62
  • UOPS_PORT_1: 0.69
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 0.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • INST_DECODED.DEC0: 1.0

With additional dependency-breaking instructions

With unroll_count=500 and no inner loop

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	14 00                	adc    al,0x0
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 1.0
  • Reference cycles: 0.91
  • UOPS_RETIRED.ANY: 3.0
  • RETIRE_SLOTS: 3.0
  • UOPS_MS: 0.0
  • UOPS_PORT_0: 1.01
  • UOPS_PORT_1: 1.0
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 0.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • INST_DECODED.DEC0: 1.0

With loop_count=1000 and unroll_count=10

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	14 00                	adc    al,0x0
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.2
  • Core cycles: 1.1
  • Reference cycles: 1.02
  • UOPS_RETIRED.ANY: 3.2
  • RETIRE_SLOTS: 3.2
  • UOPS_MS: 0.0
  • UOPS_PORT_0: 1.05
  • UOPS_PORT_1: 1.05
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 1.1
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • INST_DECODED.DEC0: 1.0

With loop_count=100 and unroll_count=100

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	14 00                	adc    al,0x0
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.02
  • Core cycles: 1.01
  • Reference cycles: 0.97
  • UOPS_RETIRED.ANY: 3.02
  • RETIRE_SLOTS: 3.02
  • UOPS_MS: 0.0
  • UOPS_PORT_0: 1.01
  • UOPS_PORT_1: 1.01
  • UOPS_PORT_2: 0.0
  • UOPS_PORT_3: 0.0
  • UOPS_PORT_4: 0.0
  • UOPS_PORT_5: 1.01
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • INST_DECODED.DEC0: 1.0