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: 4.0
  • Reference cycles: 1.32
  • UOPS_EXECUTED.THREAD: 5.0
  • RETIRE_SLOTS: 5.0
  • UOPS_MITE: 4.0
  • UOPS_MS: 1.0
  • UOPS_PORT_0: 0.0
  • UOPS_PORT_1: 0.5
  • UOPS_PORT_5: 0.5
  • UOPS_PORT_6: 1.0
  • UOPS_PORT_23: 1.0
  • UOPS_PORT_49: 1.0
  • UOPS_PORT_78: 1.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • UOPS_MITE>=1: 1.0

With unroll_count=500, no inner loop, and 1 NOP

• Code:

     0:	a4                   	movs   BYTE PTR es:[rdi],BYTE PTR ds:[rsi]
     1:	90                   	nop
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 5.0
  • Reference cycles: 1.66
  • UOPS_EXECUTED.THREAD: 5.0
  • RETIRE_SLOTS: 6.0
  • UOPS_MITE: 5.0
  • UOPS_MS: 1.0
  • UOPS_PORT_0: 0.5
  • UOPS_PORT_1: 0.5
  • UOPS_PORT_5: 0.5
  • UOPS_PORT_6: 0.5
  • UOPS_PORT_23: 1.0
  • UOPS_PORT_49: 1.0
  • UOPS_PORT_78: 1.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • UOPS_MITE>=1: 2.0

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: 1.36
  • UOPS_EXECUTED.THREAD: 5.1
  • RETIRE_SLOTS: 5.1
  • UOPS_MITE: 4.1
  • UOPS_MS: 1.0
  • UOPS_PORT_0: 0.1
  • UOPS_PORT_1: 0.5
  • UOPS_PORT_5: 0.5
  • UOPS_PORT_6: 1.0
  • UOPS_PORT_23: 1.0
  • UOPS_PORT_49: 1.0
  • UOPS_PORT_78: 1.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • UOPS_MITE>=1: 1.1

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: 1.33
  • UOPS_EXECUTED.THREAD: 5.01
  • RETIRE_SLOTS: 5.01
  • UOPS_MITE: 4.01
  • UOPS_MS: 1.0
  • UOPS_PORT_0: 0.01
  • UOPS_PORT_1: 0.5
  • UOPS_PORT_5: 0.5
  • UOPS_PORT_6: 1.0
  • UOPS_PORT_23: 1.0
  • UOPS_PORT_49: 1.0
  • UOPS_PORT_78: 1.0
  • DIV_CYCLES: 0.0
  • ILD_STALL.LCP: 0.0
  • UOPS_MITE>=1: 1.01