MOVSB - Throughput and Uops

With unroll_count=500 and no inner loop

• Code:

     0:	a4                   	movs   BYTE PTR es:[rdi],BYTE PTR ds:[rsi]
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.0
  • Core cycles: 3.97
  • Reference cycles: 3.32
  • UOPS_RETIRED.ANY: 5.0
  • RETIRE_SLOTS: 5.0
  • UOPS_MS: 1.0
  • UOPS_PORT_0: 0.65
  • UOPS_PORT_1: 0.65
  • UOPS_PORT_2: 1.0
  • UOPS_PORT_3: 1.0
  • UOPS_PORT_4: 1.01
  • 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:	a4                   	movs   BYTE PTR es:[rdi],BYTE PTR ds:[rsi]
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.2
  • Core cycles: 4.1
  • Reference cycles: 3.42
  • UOPS_RETIRED.ANY: 5.2
  • RETIRE_SLOTS: 5.2
  • UOPS_MS: 1.0
  • UOPS_PORT_0: 0.7
  • UOPS_PORT_1: 0.7
  • UOPS_PORT_2: 1.0
  • UOPS_PORT_3: 1.0
  • UOPS_PORT_4: 1.0
  • UOPS_PORT_5: 0.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • INST_DECODED.DEC0: 1.0

With loop_count=100 and unroll_count=100

• Code:

     0:	a4                   	movs   BYTE PTR es:[rdi],BYTE PTR ds:[rsi]
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.02
  • Core cycles: 4.01
  • Reference cycles: 3.34
  • UOPS_RETIRED.ANY: 5.02
  • RETIRE_SLOTS: 5.02
  • UOPS_MS: 1.0
  • UOPS_PORT_0: 0.66
  • UOPS_PORT_1: 0.66
  • UOPS_PORT_2: 1.0
  • UOPS_PORT_3: 1.0
  • UOPS_PORT_4: 1.0
  • UOPS_PORT_5: 0.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • INST_DECODED.DEC0: 1.0