XCHG (R64, R64)

With unroll_count=500 and no inner loop

Code:

   0:	4d 87 c8             	xchg   r8,r9

Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 3.57
- Reference cycles: 3.74
- UOPS_RETIRED.ALL: 3.0
- UOPS_MS: 3.0

With loop_count=1000 and unroll_count=10

Code:

   0:	4d 87 c8             	xchg   r8,r9

Show nanoBench command
Results:
- Instructions retired: 1.2
- Core cycles: 3.29
- Reference cycles: 3.38
- UOPS_RETIRED.ALL: 3.2
- UOPS_MS: 3.0

With loop_count=100 and unroll_count=100

Code:

   0:	4d 87 c8             	xchg   r8,r9

Show nanoBench command
Results:
- Instructions retired: 1.02
- Core cycles: 3.55
- Reference cycles: 3.64
- UOPS_RETIRED.ALL: 3.02
- UOPS_MS: 3.0

With 4 independent instructions

With unroll_count=200 and no inner loop

Code:

   0:	4d 87 c8             	xchg   r8,r9
   3:	4d 87 da             	xchg   r10,r11
   6:	4d 87 ec             	xchg   r12,r13
   9:	49 87 de             	xchg   r14,rbx

Show nanoBench command
Results:
- Instructions retired: 4.0
- Core cycles: 14.22
- Reference cycles: 14.4
- UOPS_RETIRED.ALL: 12.0
- UOPS_MS: 12.0

With loop_count=1000 and unroll_count=2

Code:

   0:	4d 87 c8             	xchg   r8,r9
   3:	4d 87 da             	xchg   r10,r11
   6:	4d 87 ec             	xchg   r12,r13
   9:	49 87 de             	xchg   r14,rbx

Show nanoBench command
Results:
- Instructions retired: 5.0
- Core cycles: 12.27
- Reference cycles: 12.54
- UOPS_RETIRED.ALL: 13.0
- UOPS_MS: 12.0

With loop_count=100 and unroll_count=20

Code:

   0:	4d 87 c8             	xchg   r8,r9
   3:	4d 87 da             	xchg   r10,r11
   6:	4d 87 ec             	xchg   r12,r13
   9:	49 87 de             	xchg   r14,rbx

Show nanoBench command
Results:
- Instructions retired: 4.1
- Core cycles: 13.95
- Reference cycles: 14.32
- UOPS_RETIRED.ALL: 12.1
- UOPS_MS: 12.0

With 6 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	4d 87 c8             	xchg   r8,r9
   3:	4d 87 da             	xchg   r10,r11
   6:	4d 87 ec             	xchg   r12,r13
   9:	49 87 de             	xchg   r14,rbx
   c:	48 87 d1             	xchg   rcx,rdx
   f:	48 87 f7             	xchg   rdi,rsi

Show nanoBench command
Results:
- Instructions retired: 6.0
- Core cycles: 21.36
- Reference cycles: 21.6
- UOPS_RETIRED.ALL: 18.0
- UOPS_MS: 18.0

With loop_count=1000 and unroll_count=2

Code:

   0:	4d 87 c8             	xchg   r8,r9
   3:	4d 87 da             	xchg   r10,r11
   6:	4d 87 ec             	xchg   r12,r13
   9:	49 87 de             	xchg   r14,rbx
   c:	48 87 d1             	xchg   rcx,rdx
   f:	48 87 f7             	xchg   rdi,rsi

Show nanoBench command
Results:
- Instructions retired: 7.0
- Core cycles: 18.53
- Reference cycles: 18.97
- UOPS_RETIRED.ALL: 19.0
- UOPS_MS: 18.0

With loop_count=100 and unroll_count=20

Code:

   0:	4d 87 c8             	xchg   r8,r9
   3:	4d 87 da             	xchg   r10,r11
   6:	4d 87 ec             	xchg   r12,r13
   9:	49 87 de             	xchg   r14,rbx
   c:	48 87 d1             	xchg   rcx,rdx
   f:	48 87 f7             	xchg   rdi,rsi

Show nanoBench command
Results:
- Instructions retired: 6.1
- Core cycles: 21.44
- Reference cycles: 21.96
- UOPS_RETIRED.ALL: 18.1
- UOPS_MS: 18.0

With the same register for for different operands

With 1 independent instruction

With unroll_count=500 and no inner loop

Code:

   0:	4d 87 c0             	xchg   r8,r8

Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 3.57
- Reference cycles: 3.65
- UOPS_RETIRED.ALL: 3.0
- UOPS_MS: 3.0

With loop_count=1000 and unroll_count=10

Code:

   0:	4d 87 c0             	xchg   r8,r8

Show nanoBench command
Results:
- Instructions retired: 1.2
- Core cycles: 3.1
- Reference cycles: 3.18
- UOPS_RETIRED.ALL: 3.2
- UOPS_MS: 3.0

With loop_count=100 and unroll_count=100

Code:

   0:	4d 87 c0             	xchg   r8,r8

Show nanoBench command
Results:
- Instructions retired: 1.02
- Core cycles: 3.54
- Reference cycles: 3.63
- UOPS_RETIRED.ALL: 3.02
- UOPS_MS: 3.0

With 4 independent instructions

With unroll_count=200 and no inner loop

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11

Show nanoBench command
Results:
- Instructions retired: 4.0
- Core cycles: 14.23
- Reference cycles: 14.4
- UOPS_RETIRED.ALL: 12.0
- UOPS_MS: 12.0

With loop_count=1000 and unroll_count=2

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11

Show nanoBench command
Results:
- Instructions retired: 5.0
- Core cycles: 12.27
- Reference cycles: 12.57
- UOPS_RETIRED.ALL: 13.0
- UOPS_MS: 12.0

With loop_count=100 and unroll_count=20

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11

Show nanoBench command
Results:
- Instructions retired: 4.1
- Core cycles: 13.96
- Reference cycles: 14.3
- UOPS_RETIRED.ALL: 12.1
- UOPS_MS: 12.0

With 8 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11
   c:	4d 87 e4             	xchg   r12,r12
   f:	4d 87 ed             	xchg   r13,r13
  12:	4d 87 f6             	xchg   r14,r14
  15:	48 87 db             	xchg   rbx,rbx

Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 28.56
- Reference cycles: 29.12
- UOPS_RETIRED.ALL: 24.0
- UOPS_MS: 24.0

With loop_count=1000 and unroll_count=1

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11
   c:	4d 87 e4             	xchg   r12,r12
   f:	4d 87 ed             	xchg   r13,r13
  12:	4d 87 f6             	xchg   r14,r14
  15:	48 87 db             	xchg   rbx,rbx

Show nanoBench command
Results:
- Instructions retired: 10.0
- Core cycles: 24.53
- Reference cycles: 25.14
- UOPS_RETIRED.ALL: 26.0
- UOPS_MS: 24.0

With loop_count=100 and unroll_count=10

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11
   c:	4d 87 e4             	xchg   r12,r12
   f:	4d 87 ed             	xchg   r13,r13
  12:	4d 87 f6             	xchg   r14,r14
  15:	48 87 db             	xchg   rbx,rbx

Show nanoBench command
Results:
- Instructions retired: 8.2
- Core cycles: 27.84
- Reference cycles: 28.51
- UOPS_RETIRED.ALL: 24.2
- UOPS_MS: 24.0

With 13 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11
   c:	4d 87 e4             	xchg   r12,r12
   f:	4d 87 ed             	xchg   r13,r13
  12:	4d 87 f6             	xchg   r14,r14
  15:	48 87 db             	xchg   rbx,rbx
  18:	48 87 c9             	xchg   rcx,rcx
  1b:	48 87 d2             	xchg   rdx,rdx
  1e:	48 87 ff             	xchg   rdi,rdi
  21:	48 87 f6             	xchg   rsi,rsi
  24:	48 87 ed             	xchg   rbp,rbp

Show nanoBench command
Results:
- Instructions retired: 13.0
- Core cycles: 46.46
- Reference cycles: 47.36
- UOPS_RETIRED.ALL: 39.0
- UOPS_MS: 39.0

With loop_count=1000 and unroll_count=1

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11
   c:	4d 87 e4             	xchg   r12,r12
   f:	4d 87 ed             	xchg   r13,r13
  12:	4d 87 f6             	xchg   r14,r14
  15:	48 87 db             	xchg   rbx,rbx
  18:	48 87 c9             	xchg   rcx,rcx
  1b:	48 87 d2             	xchg   rdx,rdx
  1e:	48 87 ff             	xchg   rdi,rdi
  21:	48 87 f6             	xchg   rsi,rsi
  24:	48 87 ed             	xchg   rbp,rbp

Show nanoBench command
Results:
- Instructions retired: 15.0
- Core cycles: 40.54
- Reference cycles: 41.5
- UOPS_RETIRED.ALL: 41.0
- UOPS_MS: 39.0

With loop_count=100 and unroll_count=10

Code:

   0:	4d 87 c0             	xchg   r8,r8
   3:	4d 87 c9             	xchg   r9,r9
   6:	4d 87 d2             	xchg   r10,r10
   9:	4d 87 db             	xchg   r11,r11
   c:	4d 87 e4             	xchg   r12,r12
   f:	4d 87 ed             	xchg   r13,r13
  12:	4d 87 f6             	xchg   r14,r14
  15:	48 87 db             	xchg   rbx,rbx
  18:	48 87 c9             	xchg   rcx,rcx
  1b:	48 87 d2             	xchg   rdx,rdx
  1e:	48 87 ff             	xchg   rdi,rdi
  21:	48 87 f6             	xchg   rsi,rsi
  24:	48 87 ed             	xchg   rbp,rbp

Show nanoBench command
Results:
- Instructions retired: 13.2
- Core cycles: 46.52
- Reference cycles: 47.66
- UOPS_RETIRED.ALL: 39.2
- UOPS_MS: 39.0

XCHG (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 6 independent instructions

With unroll_count=100 and no inner loop

With loop_count=1000 and unroll_count=2

With loop_count=100 and unroll_count=20

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