CRC32 (R64, R64)

Experiment 1

Instruction: CRC32 R8, R9

Code:

   0:	f2 4d 0f 38 f1 c1    	crc32  r8,r9

Init:
```
VZEROALL
```
Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 3.0
- Reference cycles: 1.54
- UOPS_EXECUTED.THREAD: 1.0

Experiment 2

Instruction: CRC32 R8, R9
Chain instructions: MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
Chain latency: 7

Code:

   0:	f2 4d 0f 38 f1 c1    	crc32  r8,r9
   6:	4d 63 c0             	movsxd r8,r8d
   9:	4d 63 c0             	movsxd r8,r8d
   c:	4d 63 c0             	movsxd r8,r8d
   f:	4d 63 c0             	movsxd r8,r8d
  12:	4d 63 c0             	movsxd r8,r8d
  15:	4d 63 c0             	movsxd r8,r8d
  18:	4d 63 c0             	movsxd r8,r8d

Init:
```
VZEROALL
```
Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 10.0
- Reference cycles: 8.21
- UOPS_EXECUTED.THREAD: 8.0

Experiment 3 (with clean upper 32 bits)

Instruction: CRC32 R8, R9

Code:

   0:	f2 4d 0f 38 f1 c1    	crc32  r8,r9

Init:
```
VZEROALL;
MOV R9D, R9D;
```
Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 3.0
- Reference cycles: 1.54
- UOPS_EXECUTED.THREAD: 1.0

Experiment 4 (with clean upper 32 bits)

Instruction: CRC32 R8, R9
Chain instructions: MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
Chain latency: 7

Code:

   0:	f2 4d 0f 38 f1 c1    	crc32  r8,r9
   6:	4d 63 c0             	movsxd r8,r8d
   9:	4d 63 c0             	movsxd r8,r8d
   c:	4d 63 c0             	movsxd r8,r8d
   f:	4d 63 c0             	movsxd r8,r8d
  12:	4d 63 c0             	movsxd r8,r8d
  15:	4d 63 c0             	movsxd r8,r8d
  18:	4d 63 c0             	movsxd r8,r8d

Init:
```
VZEROALL;
MOV R9D, R9D;
```
Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 10.0
- Reference cycles: 8.21
- UOPS_EXECUTED.THREAD: 8.0

Experiment 1

Instruction: CRC32 R9, R8
Chain instructions: MOVSX R8, R9D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D;MOVSX R8, R8D
Chain latency: 7

Code:

   0:	f2 4d 0f 38 f1 c8    	crc32  r9,r8
   6:	4d 63 c1             	movsxd r8,r9d
   9:	4d 63 c0             	movsxd r8,r8d
   c:	4d 63 c0             	movsxd r8,r8d
   f:	4d 63 c0             	movsxd r8,r8d
  12:	4d 63 c0             	movsxd r8,r8d
  15:	4d 63 c0             	movsxd r8,r8d
  18:	4d 63 c0             	movsxd r8,r8d

Init:
```
VZEROALL
```
Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 10.01
- Reference cycles: 7.19
- UOPS_EXECUTED.THREAD: 8.0

Experiment 2

Instruction: CRC32 R9, R8
Chain instruction: CRC32 R8, R9

Code:

   0:	f2 4d 0f 38 f1 c8    	crc32  r9,r8
   6:	f2 4d 0f 38 f1 c1    	crc32  r8,r9

Init:
```
VZEROALL
```
Show nanoBench command
Results:
- Instructions retired: 2.0
- Core cycles: 6.0
- Reference cycles: 4.88
- UOPS_EXECUTED.THREAD: 2.0

Experiment 3 (with dependency-breaking instructions)

Instruction: CRC32 R9, R8
Chain instructions: CRC32 R8, R9;MOV R9, 0

Code:

   0:	f2 4d 0f 38 f1 c8    	crc32  r9,r8
   6:	f2 4d 0f 38 f1 c1    	crc32  r8,r9
   c:	49 c7 c1 00 00 00 00 	mov    r9,0x0

Init:
```
VZEROALL
```
Show nanoBench command
Results:
- Instructions retired: 3.0
- Core cycles: 6.01
- Reference cycles: 4.62
- UOPS_EXECUTED.THREAD: 3.0

CRC32 (R64, R64) - Latency

Operands

Latency operand 1 → 1: 3

Latency operand 2 → 1: 3

Latency operand 1 → 1: 3

Experiment 1

Experiment 2

Experiment 3 (with clean upper 32 bits)

Experiment 4 (with clean upper 32 bits)

Latency operand 2 → 1: 3

Experiment 1

Experiment 2

Experiment 3 (with dependency-breaking instructions)