LZCNT (R64, R64)

With unroll_count=500 and no inner loop

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9

Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 16.0
- Reference cycles: 16.0
- UOPS_RETIRED.ANY: 10.0
- UOPS_MS: 10.0

With loop_count=1000 and unroll_count=10

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9

Show nanoBench command
Results:
- Instructions retired: 1.2
- Core cycles: 16.1
- Reference cycles: 16.1
- UOPS_RETIRED.ANY: 10.2
- UOPS_MS: 10.0

With loop_count=100 and unroll_count=100

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9

Show nanoBench command
Results:
- Instructions retired: 1.02
- Core cycles: 16.01
- Reference cycles: 16.01
- UOPS_RETIRED.ANY: 10.02
- UOPS_MS: 10.0

With 4 independent instructions

With unroll_count=200 and no inner loop

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9

Show nanoBench command
Results:
- Instructions retired: 4.0
- Core cycles: 64.0
- Reference cycles: 63.99
- UOPS_RETIRED.ANY: 40.0
- UOPS_MS: 40.0

With loop_count=1000 and unroll_count=2

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9

Show nanoBench command
Results:
- Instructions retired: 5.0
- Core cycles: 64.51
- Reference cycles: 64.51
- UOPS_RETIRED.ANY: 41.0
- UOPS_MS: 40.01

With loop_count=100 and unroll_count=20

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9

Show nanoBench command
Results:
- Instructions retired: 4.1
- Core cycles: 64.06
- Reference cycles: 64.06
- UOPS_RETIRED.ANY: 40.1
- UOPS_MS: 40.01

With 8 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9
  14:	f3 4d 0f bd e9       	lzcnt  r13,r9
  19:	f3 4d 0f bd f1       	lzcnt  r14,r9
  1e:	f3 49 0f bd d9       	lzcnt  rbx,r9
  23:	f3 49 0f bd c9       	lzcnt  rcx,r9

Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 128.0
- Reference cycles: 128.01
- UOPS_RETIRED.ANY: 80.0
- UOPS_MS: 80.0

With loop_count=1000 and unroll_count=1

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9
  14:	f3 4d 0f bd e9       	lzcnt  r13,r9
  19:	f3 4d 0f bd f1       	lzcnt  r14,r9
  1e:	f3 49 0f bd d9       	lzcnt  rbx,r9
  23:	f3 49 0f bd c9       	lzcnt  rcx,r9

Show nanoBench command
Results:
- Instructions retired: 10.0
- Core cycles: 129.02
- Reference cycles: 129.02
- UOPS_RETIRED.ANY: 82.0
- UOPS_MS: 80.03

With loop_count=100 and unroll_count=10

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9
  14:	f3 4d 0f bd e9       	lzcnt  r13,r9
  19:	f3 4d 0f bd f1       	lzcnt  r14,r9
  1e:	f3 49 0f bd d9       	lzcnt  rbx,r9
  23:	f3 49 0f bd c9       	lzcnt  rcx,r9

Show nanoBench command
Results:
- Instructions retired: 8.2
- Core cycles: 128.12
- Reference cycles: 128.12
- UOPS_RETIRED.ANY: 80.2
- UOPS_MS: 80.03

With 12 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9
  14:	f3 4d 0f bd e9       	lzcnt  r13,r9
  19:	f3 4d 0f bd f1       	lzcnt  r14,r9
  1e:	f3 49 0f bd d9       	lzcnt  rbx,r9
  23:	f3 49 0f bd c9       	lzcnt  rcx,r9
  28:	f3 49 0f bd d1       	lzcnt  rdx,r9
  2d:	f3 49 0f bd f9       	lzcnt  rdi,r9
  32:	f3 49 0f bd f1       	lzcnt  rsi,r9
  37:	f3 49 0f bd e9       	lzcnt  rbp,r9

Show nanoBench command
Results:
- Instructions retired: 12.0
- Core cycles: 192.0
- Reference cycles: 191.97
- UOPS_RETIRED.ANY: 120.0
- UOPS_MS: 120.0

With loop_count=1000 and unroll_count=1

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9
  14:	f3 4d 0f bd e9       	lzcnt  r13,r9
  19:	f3 4d 0f bd f1       	lzcnt  r14,r9
  1e:	f3 49 0f bd d9       	lzcnt  rbx,r9
  23:	f3 49 0f bd c9       	lzcnt  rcx,r9
  28:	f3 49 0f bd d1       	lzcnt  rdx,r9
  2d:	f3 49 0f bd f9       	lzcnt  rdi,r9
  32:	f3 49 0f bd f1       	lzcnt  rsi,r9
  37:	f3 49 0f bd e9       	lzcnt  rbp,r9

Show nanoBench command
Results:
- Instructions retired: 14.0
- Core cycles: 193.02
- Reference cycles: 193.02
- UOPS_RETIRED.ANY: 122.0
- UOPS_MS: 120.03

With loop_count=100 and unroll_count=10

Code:

   0:	f3 4d 0f bd c1       	lzcnt  r8,r9
   5:	f3 4d 0f bd d1       	lzcnt  r10,r9
   a:	f3 4d 0f bd d9       	lzcnt  r11,r9
   f:	f3 4d 0f bd e1       	lzcnt  r12,r9
  14:	f3 4d 0f bd e9       	lzcnt  r13,r9
  19:	f3 4d 0f bd f1       	lzcnt  r14,r9
  1e:	f3 49 0f bd d9       	lzcnt  rbx,r9
  23:	f3 49 0f bd c9       	lzcnt  rcx,r9
  28:	f3 49 0f bd d1       	lzcnt  rdx,r9
  2d:	f3 49 0f bd f9       	lzcnt  rdi,r9
  32:	f3 49 0f bd f1       	lzcnt  rsi,r9
  37:	f3 49 0f bd e9       	lzcnt  rbp,r9

Show nanoBench command
Results:
- Instructions retired: 12.2
- Core cycles: 192.13
- Reference cycles: 192.14
- UOPS_RETIRED.ANY: 120.2
- UOPS_MS: 120.03

With the same register for for different operands

With 1 independent instruction

With unroll_count=500 and no inner loop

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8

Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 17.0
- Reference cycles: 17.0
- UOPS_RETIRED.ANY: 10.0
- UOPS_MS: 10.0

With loop_count=1000 and unroll_count=10

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8

Show nanoBench command
Results:
- Instructions retired: 1.2
- Core cycles: 17.0
- Reference cycles: 17.0
- UOPS_RETIRED.ANY: 10.2
- UOPS_MS: 10.0

With loop_count=100 and unroll_count=100

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8

Show nanoBench command
Results:
- Instructions retired: 1.02
- Core cycles: 17.0
- Reference cycles: 17.0
- UOPS_RETIRED.ANY: 10.02
- UOPS_MS: 10.0

With 4 independent instructions

With unroll_count=200 and no inner loop

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11

Show nanoBench command
Results:
- Instructions retired: 4.0
- Core cycles: 64.0
- Reference cycles: 64.01
- UOPS_RETIRED.ANY: 40.0
- UOPS_MS: 40.0

With loop_count=1000 and unroll_count=2

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11

Show nanoBench command
Results:
- Instructions retired: 5.0
- Core cycles: 64.51
- Reference cycles: 64.51
- UOPS_RETIRED.ANY: 41.0
- UOPS_MS: 40.01

With loop_count=100 and unroll_count=20

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11

Show nanoBench command
Results:
- Instructions retired: 4.1
- Core cycles: 64.06
- Reference cycles: 64.06
- UOPS_RETIRED.ANY: 40.1
- UOPS_MS: 40.01

With 8 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11
  14:	f3 4d 0f bd e4       	lzcnt  r12,r12
  19:	f3 4d 0f bd ed       	lzcnt  r13,r13
  1e:	f3 4d 0f bd f6       	lzcnt  r14,r14
  23:	f3 48 0f bd db       	lzcnt  rbx,rbx

Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 128.0
- Reference cycles: 127.98
- UOPS_RETIRED.ANY: 80.0
- UOPS_MS: 80.0

With loop_count=1000 and unroll_count=1

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11
  14:	f3 4d 0f bd e4       	lzcnt  r12,r12
  19:	f3 4d 0f bd ed       	lzcnt  r13,r13
  1e:	f3 4d 0f bd f6       	lzcnt  r14,r14
  23:	f3 48 0f bd db       	lzcnt  rbx,rbx

Show nanoBench command
Results:
- Instructions retired: 10.0
- Core cycles: 129.02
- Reference cycles: 129.02
- UOPS_RETIRED.ANY: 82.0
- UOPS_MS: 80.03

With loop_count=100 and unroll_count=10

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11
  14:	f3 4d 0f bd e4       	lzcnt  r12,r12
  19:	f3 4d 0f bd ed       	lzcnt  r13,r13
  1e:	f3 4d 0f bd f6       	lzcnt  r14,r14
  23:	f3 48 0f bd db       	lzcnt  rbx,rbx

Show nanoBench command
Results:
- Instructions retired: 8.2
- Core cycles: 128.12
- Reference cycles: 128.12
- UOPS_RETIRED.ANY: 80.2
- UOPS_MS: 80.03

With 13 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11
  14:	f3 4d 0f bd e4       	lzcnt  r12,r12
  19:	f3 4d 0f bd ed       	lzcnt  r13,r13
  1e:	f3 4d 0f bd f6       	lzcnt  r14,r14
  23:	f3 48 0f bd db       	lzcnt  rbx,rbx
  28:	f3 48 0f bd c9       	lzcnt  rcx,rcx
  2d:	f3 48 0f bd d2       	lzcnt  rdx,rdx
  32:	f3 48 0f bd ff       	lzcnt  rdi,rdi
  37:	f3 48 0f bd f6       	lzcnt  rsi,rsi
  3c:	f3 48 0f bd ed       	lzcnt  rbp,rbp

Show nanoBench command
Results:
- Instructions retired: 13.0
- Core cycles: 208.0
- Reference cycles: 208.02
- UOPS_RETIRED.ANY: 130.0
- UOPS_MS: 130.0

With loop_count=1000 and unroll_count=1

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11
  14:	f3 4d 0f bd e4       	lzcnt  r12,r12
  19:	f3 4d 0f bd ed       	lzcnt  r13,r13
  1e:	f3 4d 0f bd f6       	lzcnt  r14,r14
  23:	f3 48 0f bd db       	lzcnt  rbx,rbx
  28:	f3 48 0f bd c9       	lzcnt  rcx,rcx
  2d:	f3 48 0f bd d2       	lzcnt  rdx,rdx
  32:	f3 48 0f bd ff       	lzcnt  rdi,rdi
  37:	f3 48 0f bd f6       	lzcnt  rsi,rsi
  3c:	f3 48 0f bd ed       	lzcnt  rbp,rbp

Show nanoBench command
Results:
- Instructions retired: 15.0
- Core cycles: 209.02
- Reference cycles: 209.02
- UOPS_RETIRED.ANY: 132.0
- UOPS_MS: 130.03

With loop_count=100 and unroll_count=10

Code:

   0:	f3 4d 0f bd c0       	lzcnt  r8,r8
   5:	f3 4d 0f bd c9       	lzcnt  r9,r9
   a:	f3 4d 0f bd d2       	lzcnt  r10,r10
   f:	f3 4d 0f bd db       	lzcnt  r11,r11
  14:	f3 4d 0f bd e4       	lzcnt  r12,r12
  19:	f3 4d 0f bd ed       	lzcnt  r13,r13
  1e:	f3 4d 0f bd f6       	lzcnt  r14,r14
  23:	f3 48 0f bd db       	lzcnt  rbx,rbx
  28:	f3 48 0f bd c9       	lzcnt  rcx,rcx
  2d:	f3 48 0f bd d2       	lzcnt  rdx,rdx
  32:	f3 48 0f bd ff       	lzcnt  rdi,rdi
  37:	f3 48 0f bd f6       	lzcnt  rsi,rsi
  3c:	f3 48 0f bd ed       	lzcnt  rbp,rbp

Show nanoBench command
Results:
- Instructions retired: 13.2
- Core cycles: 208.12
- Reference cycles: 208.12
- UOPS_RETIRED.ANY: 130.2
- UOPS_MS: 130.03

LZCNT (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