BSR (R64, R64)

With unroll_count=500 and no inner loop

Code:

   0:	4d 0f bd c1          	bsr    r8,r9

Show nanoBench command
Results:
- MPERF: 3.49
- APERF: 4.0
- 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 bd c1          	bsr    r8,r9

Show nanoBench command
Results:
- MPERF: 3.49
- APERF: 4.0
- 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 bd c1          	bsr    r8,r9

Show nanoBench command
Results:
- MPERF: 3.49
- APERF: 4.0
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9

Show nanoBench command
Results:
- MPERF: 13.94
- APERF: 16.0
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9

Show nanoBench command
Results:
- MPERF: 13.95
- APERF: 16.0
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9

Show nanoBench command
Results:
- MPERF: 13.95
- APERF: 16.0
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9
  10:	4d 0f bd e9          	bsr    r13,r9
  14:	4d 0f bd f1          	bsr    r14,r9
  18:	49 0f bd d9          	bsr    rbx,r9
  1c:	49 0f bd c9          	bsr    rcx,r9

Show nanoBench command
Results:
- MPERF: 27.88
- APERF: 32.0
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9
  10:	4d 0f bd e9          	bsr    r13,r9
  14:	4d 0f bd f1          	bsr    r14,r9
  18:	49 0f bd d9          	bsr    rbx,r9
  1c:	49 0f bd c9          	bsr    rcx,r9

Show nanoBench command
Results:
- MPERF: 27.91
- APERF: 32.01
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9
  10:	4d 0f bd e9          	bsr    r13,r9
  14:	4d 0f bd f1          	bsr    r14,r9
  18:	49 0f bd d9          	bsr    rbx,r9
  1c:	49 0f bd c9          	bsr    rcx,r9

Show nanoBench command
Results:
- MPERF: 27.91
- APERF: 32.01
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9
  10:	4d 0f bd e9          	bsr    r13,r9
  14:	4d 0f bd f1          	bsr    r14,r9
  18:	49 0f bd d9          	bsr    rbx,r9
  1c:	49 0f bd c9          	bsr    rcx,r9
  20:	49 0f bd d1          	bsr    rdx,r9
  24:	49 0f bd f9          	bsr    rdi,r9
  28:	49 0f bd f1          	bsr    rsi,r9
  2c:	49 0f bd e9          	bsr    rbp,r9

Show nanoBench command
Results:
- MPERF: 41.82
- APERF: 48.0
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9
  10:	4d 0f bd e9          	bsr    r13,r9
  14:	4d 0f bd f1          	bsr    r14,r9
  18:	49 0f bd d9          	bsr    rbx,r9
  1c:	49 0f bd c9          	bsr    rcx,r9
  20:	49 0f bd d1          	bsr    rdx,r9
  24:	49 0f bd f9          	bsr    rdi,r9
  28:	49 0f bd f1          	bsr    rsi,r9
  2c:	49 0f bd e9          	bsr    rbp,r9

Show nanoBench command
Results:
- MPERF: 41.85
- APERF: 48.01
- 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 bd c1          	bsr    r8,r9
   4:	4d 0f bd d1          	bsr    r10,r9
   8:	4d 0f bd d9          	bsr    r11,r9
   c:	4d 0f bd e1          	bsr    r12,r9
  10:	4d 0f bd e9          	bsr    r13,r9
  14:	4d 0f bd f1          	bsr    r14,r9
  18:	49 0f bd d9          	bsr    rbx,r9
  1c:	49 0f bd c9          	bsr    rcx,r9
  20:	49 0f bd d1          	bsr    rdx,r9
  24:	49 0f bd f9          	bsr    rdi,r9
  28:	49 0f bd f1          	bsr    rsi,r9
  2c:	49 0f bd e9          	bsr    rbp,r9

Show nanoBench command
Results:
- MPERF: 41.85
- APERF: 48.01
- 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 bd c0          	bsr    r8,r8

Show nanoBench command
Results:
- MPERF: 3.52
- APERF: 4.05
- 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 bd c0          	bsr    r8,r8

Show nanoBench command
Results:
- MPERF: 3.54
- APERF: 4.06
- 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 bd c0          	bsr    r8,r8

Show nanoBench command
Results:
- MPERF: 3.53
- APERF: 4.05
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11

Show nanoBench command
Results:
- MPERF: 13.94
- APERF: 16.0
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11

Show nanoBench command
Results:
- MPERF: 13.95
- APERF: 16.0
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11

Show nanoBench command
Results:
- MPERF: 13.95
- APERF: 16.0
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11
  10:	4d 0f bd e4          	bsr    r12,r12
  14:	4d 0f bd ed          	bsr    r13,r13
  18:	4d 0f bd f6          	bsr    r14,r14
  1c:	48 0f bd db          	bsr    rbx,rbx

Show nanoBench command
Results:
- MPERF: 27.88
- APERF: 32.0
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11
  10:	4d 0f bd e4          	bsr    r12,r12
  14:	4d 0f bd ed          	bsr    r13,r13
  18:	4d 0f bd f6          	bsr    r14,r14
  1c:	48 0f bd db          	bsr    rbx,rbx

Show nanoBench command
Results:
- MPERF: 27.9
- APERF: 32.01
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11
  10:	4d 0f bd e4          	bsr    r12,r12
  14:	4d 0f bd ed          	bsr    r13,r13
  18:	4d 0f bd f6          	bsr    r14,r14
  1c:	48 0f bd db          	bsr    rbx,rbx

Show nanoBench command
Results:
- MPERF: 27.9
- APERF: 32.01
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11
  10:	4d 0f bd e4          	bsr    r12,r12
  14:	4d 0f bd ed          	bsr    r13,r13
  18:	4d 0f bd f6          	bsr    r14,r14
  1c:	48 0f bd db          	bsr    rbx,rbx
  20:	48 0f bd c9          	bsr    rcx,rcx
  24:	48 0f bd d2          	bsr    rdx,rdx
  28:	48 0f bd ff          	bsr    rdi,rdi
  2c:	48 0f bd f6          	bsr    rsi,rsi
  30:	48 0f bd ed          	bsr    rbp,rbp

Show nanoBench command
Results:
- MPERF: 45.5
- APERF: 52.0
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11
  10:	4d 0f bd e4          	bsr    r12,r12
  14:	4d 0f bd ed          	bsr    r13,r13
  18:	4d 0f bd f6          	bsr    r14,r14
  1c:	48 0f bd db          	bsr    rbx,rbx
  20:	48 0f bd c9          	bsr    rcx,rcx
  24:	48 0f bd d2          	bsr    rdx,rdx
  28:	48 0f bd ff          	bsr    rdi,rdi
  2c:	48 0f bd f6          	bsr    rsi,rsi
  30:	48 0f bd ed          	bsr    rbp,rbp

Show nanoBench command
Results:
- MPERF: 45.34
- APERF: 52.01
- 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 bd c0          	bsr    r8,r8
   4:	4d 0f bd c9          	bsr    r9,r9
   8:	4d 0f bd d2          	bsr    r10,r10
   c:	4d 0f bd db          	bsr    r11,r11
  10:	4d 0f bd e4          	bsr    r12,r12
  14:	4d 0f bd ed          	bsr    r13,r13
  18:	4d 0f bd f6          	bsr    r14,r14
  1c:	48 0f bd db          	bsr    rbx,rbx
  20:	48 0f bd c9          	bsr    rcx,rcx
  24:	48 0f bd d2          	bsr    rdx,rdx
  28:	48 0f bd ff          	bsr    rdi,rdi
  2c:	48 0f bd f6          	bsr    rsi,rsi
  30:	48 0f bd ed          	bsr    rbp,rbp

Show nanoBench command
Results:
- MPERF: 45.34
- APERF: 52.01
- UOPS: 78.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

BSR (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