MUL (R64) - Throughput and Uops

With unroll_count=500 and no inner loop

• Code:

     0:	49 f7 e0             	mul    r8
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.0
  • Core cycles: 4.08
  • Reference cycles: 3.4
  • UOPS_RETIRED.ALL: 2.0
  • UOPS_MS: 0.0

With loop_count=1000 and unroll_count=10

• Code:

     0:	49 f7 e0             	mul    r8
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.2
  • Core cycles: 4.1
  • Reference cycles: 3.45
  • UOPS_RETIRED.ALL: 2.2
  • UOPS_MS: 0.0

With loop_count=100 and unroll_count=100

• Code:

     0:	49 f7 e0             	mul    r8
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.02
  • Core cycles: 4.1
  • Reference cycles: 3.46
  • UOPS_RETIRED.ALL: 2.02
  • UOPS_MS: 0.0

With additional dependency-breaking instructions

With unroll_count=500 and no inner loop

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	49 f7 e0             	mul    r8
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 1.06
  • Reference cycles: 0.81
  • UOPS_RETIRED.ALL: 3.0
  • UOPS_MS: 0.0

With loop_count=1000 and unroll_count=10

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	49 f7 e0             	mul    r8
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.2
  • Core cycles: 1.11
  • Reference cycles: 0.94
  • UOPS_RETIRED.ALL: 3.2
  • UOPS_MS: 0.0

With loop_count=100 and unroll_count=100

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	49 f7 e0             	mul    r8
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.02
  • Core cycles: 1.08
  • Reference cycles: 0.9
  • UOPS_RETIRED.ALL: 3.02
  • UOPS_MS: 0.0