BSF (R64, R64)

With unroll_count=500 and no inner loop

Code:

   0:	4d 0f bc c1          	bsf    r8,r9

Show nanoBench command
Results:
- MPERF: 2.53
- APERF: 3.0
- UOPS: 6.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=10

Code:

   0:	4d 0f bc c1          	bsf    r8,r9

Show nanoBench command
Results:
- MPERF: 2.53
- APERF: 3.0
- UOPS: 6.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=100

Code:

   0:	4d 0f bc c1          	bsf    r8,r9

Show nanoBench command
Results:
- MPERF: 2.51
- APERF: 3.0
- UOPS: 6.02
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 4 independent instructions

With unroll_count=200 and no inner loop

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9

Show nanoBench command
Results:
- MPERF: 10.05
- APERF: 12.0
- UOPS: 24.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=2

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9

Show nanoBench command
Results:
- MPERF: 10.04
- APERF: 12.01
- UOPS: 25.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=20

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9

Show nanoBench command
Results:
- MPERF: 10.12
- APERF: 12.01
- UOPS: 24.1
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 8 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9
  10:	4d 0f bc e9          	bsf    r13,r9
  14:	4d 0f bc f1          	bsf    r14,r9
  18:	49 0f bc d9          	bsf    rbx,r9
  1c:	49 0f bc c9          	bsf    rcx,r9

Show nanoBench command
Results:
- MPERF: 20.4
- APERF: 24.0
- UOPS: 48.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=1

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9
  10:	4d 0f bc e9          	bsf    r13,r9
  14:	4d 0f bc f1          	bsf    r14,r9
  18:	49 0f bc d9          	bsf    rbx,r9
  1c:	49 0f bc c9          	bsf    rcx,r9

Show nanoBench command
Results:
- MPERF: 20.09
- APERF: 24.02
- UOPS: 50.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=10

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9
  10:	4d 0f bc e9          	bsf    r13,r9
  14:	4d 0f bc f1          	bsf    r14,r9
  18:	49 0f bc d9          	bsf    rbx,r9
  1c:	49 0f bc c9          	bsf    rcx,r9

Show nanoBench command
Results:
- MPERF: 20.22
- APERF: 24.02
- UOPS: 48.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 12 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9
  10:	4d 0f bc e9          	bsf    r13,r9
  14:	4d 0f bc f1          	bsf    r14,r9
  18:	49 0f bc d9          	bsf    rbx,r9
  1c:	49 0f bc c9          	bsf    rcx,r9
  20:	49 0f bc d1          	bsf    rdx,r9
  24:	49 0f bc f9          	bsf    rdi,r9
  28:	49 0f bc f1          	bsf    rsi,r9
  2c:	49 0f bc e9          	bsf    rbp,r9

Show nanoBench command
Results:
- MPERF: 30.06
- APERF: 36.0
- UOPS: 72.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=1

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9
  10:	4d 0f bc e9          	bsf    r13,r9
  14:	4d 0f bc f1          	bsf    r14,r9
  18:	49 0f bc d9          	bsf    rbx,r9
  1c:	49 0f bc c9          	bsf    rcx,r9
  20:	49 0f bc d1          	bsf    rdx,r9
  24:	49 0f bc f9          	bsf    rdi,r9
  28:	49 0f bc f1          	bsf    rsi,r9
  2c:	49 0f bc e9          	bsf    rbp,r9

Show nanoBench command
Results:
- MPERF: 30.17
- APERF: 36.02
- UOPS: 74.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=10

Code:

   0:	4d 0f bc c1          	bsf    r8,r9
   4:	4d 0f bc d1          	bsf    r10,r9
   8:	4d 0f bc d9          	bsf    r11,r9
   c:	4d 0f bc e1          	bsf    r12,r9
  10:	4d 0f bc e9          	bsf    r13,r9
  14:	4d 0f bc f1          	bsf    r14,r9
  18:	49 0f bc d9          	bsf    rbx,r9
  1c:	49 0f bc c9          	bsf    rcx,r9
  20:	49 0f bc d1          	bsf    rdx,r9
  24:	49 0f bc f9          	bsf    rdi,r9
  28:	49 0f bc f1          	bsf    rsi,r9
  2c:	49 0f bc e9          	bsf    rbp,r9

Show nanoBench command
Results:
- MPERF: 30.17
- APERF: 36.02
- UOPS: 72.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With the same register for for different operands

With 1 independent instruction

With unroll_count=500 and no inner loop

Code:

   0:	4d 0f bc c0          	bsf    r8,r8

Show nanoBench command
Results:
- MPERF: 2.54
- APERF: 3.0
- UOPS: 6.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=10

Code:

   0:	4d 0f bc c0          	bsf    r8,r8

Show nanoBench command
Results:
- MPERF: 2.53
- APERF: 3.01
- UOPS: 6.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=100

Code:

   0:	4d 0f bc c0          	bsf    r8,r8

Show nanoBench command
Results:
- MPERF: 2.64
- APERF: 3.13
- UOPS: 6.02
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 4 independent instructions

With unroll_count=200 and no inner loop

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11

Show nanoBench command
Results:
- MPERF: 10.08
- APERF: 12.0
- UOPS: 24.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=2

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11

Show nanoBench command
Results:
- MPERF: 10.11
- APERF: 12.01
- UOPS: 25.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=20

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11

Show nanoBench command
Results:
- MPERF: 10.12
- APERF: 12.01
- UOPS: 24.1
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 8 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11
  10:	4d 0f bc e4          	bsf    r12,r12
  14:	4d 0f bc ed          	bsf    r13,r13
  18:	4d 0f bc f6          	bsf    r14,r14
  1c:	48 0f bc db          	bsf    rbx,rbx

Show nanoBench command
Results:
- MPERF: 20.28
- APERF: 24.0
- UOPS: 48.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=1

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11
  10:	4d 0f bc e4          	bsf    r12,r12
  14:	4d 0f bc ed          	bsf    r13,r13
  18:	4d 0f bc f6          	bsf    r14,r14
  1c:	48 0f bc db          	bsf    rbx,rbx

Show nanoBench command
Results:
- MPERF: 20.23
- APERF: 24.02
- UOPS: 50.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=10

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11
  10:	4d 0f bc e4          	bsf    r12,r12
  14:	4d 0f bc ed          	bsf    r13,r13
  18:	4d 0f bc f6          	bsf    r14,r14
  1c:	48 0f bc db          	bsf    rbx,rbx

Show nanoBench command
Results:
- MPERF: 20.09
- APERF: 24.02
- UOPS: 48.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 13 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11
  10:	4d 0f bc e4          	bsf    r12,r12
  14:	4d 0f bc ed          	bsf    r13,r13
  18:	4d 0f bc f6          	bsf    r14,r14
  1c:	48 0f bc db          	bsf    rbx,rbx
  20:	48 0f bc c9          	bsf    rcx,rcx
  24:	48 0f bc d2          	bsf    rdx,rdx
  28:	48 0f bc ff          	bsf    rdi,rdi
  2c:	48 0f bc f6          	bsf    rsi,rsi
  30:	48 0f bc ed          	bsf    rbp,rbp

Show nanoBench command
Results:
- MPERF: 33.0
- APERF: 39.0
- UOPS: 78.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=1

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11
  10:	4d 0f bc e4          	bsf    r12,r12
  14:	4d 0f bc ed          	bsf    r13,r13
  18:	4d 0f bc f6          	bsf    r14,r14
  1c:	48 0f bc db          	bsf    rbx,rbx
  20:	48 0f bc c9          	bsf    rcx,rcx
  24:	48 0f bc d2          	bsf    rdx,rdx
  28:	48 0f bc ff          	bsf    rdi,rdi
  2c:	48 0f bc f6          	bsf    rsi,rsi
  30:	48 0f bc ed          	bsf    rbp,rbp

Show nanoBench command
Results:
- MPERF: 32.66
- APERF: 39.02
- UOPS: 80.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=10

Code:

   0:	4d 0f bc c0          	bsf    r8,r8
   4:	4d 0f bc c9          	bsf    r9,r9
   8:	4d 0f bc d2          	bsf    r10,r10
   c:	4d 0f bc db          	bsf    r11,r11
  10:	4d 0f bc e4          	bsf    r12,r12
  14:	4d 0f bc ed          	bsf    r13,r13
  18:	4d 0f bc f6          	bsf    r14,r14
  1c:	48 0f bc db          	bsf    rbx,rbx
  20:	48 0f bc c9          	bsf    rcx,rcx
  24:	48 0f bc d2          	bsf    rdx,rdx
  28:	48 0f bc ff          	bsf    rdi,rdi
  2c:	48 0f bc f6          	bsf    rsi,rsi
  30:	48 0f bc ed          	bsf    rbp,rbp

Show nanoBench command
Results:
- MPERF: 32.86
- APERF: 39.02
- UOPS: 78.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

BSF (R64, R64) - Throughput and Uops

With different registers for different operands

With 1 independent instruction

With unroll_count=500 and no inner loop

With loop_count=1000 and unroll_count=10

With loop_count=100 and unroll_count=100

With 4 independent instructions

With unroll_count=200 and no inner loop

With loop_count=1000 and unroll_count=2

With loop_count=100 and unroll_count=20

With 8 independent instructions

With unroll_count=100 and no inner loop

With loop_count=1000 and unroll_count=1

With loop_count=100 and unroll_count=10

With 12 independent instructions

With unroll_count=100 and no inner loop

With loop_count=1000 and unroll_count=1

With loop_count=100 and unroll_count=10

With the same register for for different operands

With 1 independent instruction

With unroll_count=500 and no inner loop

With loop_count=1000 and unroll_count=10

With loop_count=100 and unroll_count=100

With 4 independent instructions

With unroll_count=200 and no inner loop

With loop_count=1000 and unroll_count=2

With loop_count=100 and unroll_count=20

With 8 independent instructions

With unroll_count=100 and no inner loop

With loop_count=1000 and unroll_count=1

With loop_count=100 and unroll_count=10

With 13 independent instructions

With unroll_count=100 and no inner loop

With loop_count=1000 and unroll_count=1

With loop_count=100 and unroll_count=10