MUL (R32) - Throughput and Uops

With unroll_count=500 and no inner loop

• Code:

     0:	41 f7 e0             	mul    r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.0
  • Core cycles: 4.0
  • Reference cycles: 2.43
  • TOPDOWN_RETIRING.ALL: 2.0
  • UOPS_MS: 0.0

With loop_count=1000 and unroll_count=10

• Code:

     0:	41 f7 e0             	mul    r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.2
  • Core cycles: 4.0
  • Reference cycles: 2.43
  • TOPDOWN_RETIRING.ALL: 2.2
  • UOPS_MS: 0.0

With loop_count=100 and unroll_count=100

• Code:

     0:	41 f7 e0             	mul    r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 1.02
  • Core cycles: 4.0
  • Reference cycles: 2.43
  • TOPDOWN_RETIRING.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:	41 f7 e0             	mul    r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 2.0
  • Reference cycles: 1.2
  • TOPDOWN_RETIRING.ALL: 3.0
  • UOPS_MS: 0.0

With loop_count=1000 and unroll_count=10

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	41 f7 e0             	mul    r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.2
  • Core cycles: 2.0
  • Reference cycles: 1.21
  • TOPDOWN_RETIRING.ALL: 3.2
  • UOPS_MS: 0.0

With loop_count=100 and unroll_count=100

• Code:

     0:	48 31 c0             	xor    rax,rax
     3:	41 f7 e0             	mul    r8d
  

• Show nanoBench command
• Results:
  • Instructions retired: 2.02
  • Core cycles: 2.0
  • Reference cycles: 1.21
  • TOPDOWN_RETIRING.ALL: 3.02
  • UOPS_MS: 0.0