ADC (AX, I16) - Latency

Experiment 1

• Instruction: ADC AX, 256
• Chain instructions: MOVSX RAX, AX;MOVSX RAX, EAX;MOVSX RAX, EAX;MOVSX RAX, EAX;MOVSX RAX, EAX
• Chain latency: 5
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	48 0f bf c0          	movsx  rax,ax
     8:	48 63 c0             	movsxd rax,eax
     b:	48 63 c0             	movsxd rax,eax
     e:	48 63 c0             	movsxd rax,eax
    11:	48 63 c0             	movsxd rax,eax
  

• Show nanoBench command
• Results:
  • MPERF: 5.1
  • APERF: 6.0
  • UOPS: 6.0

Experiment 2

• Instruction: ADC AX, 256
• Code:

     0:	66 15 00 01          	adc    ax,0x100
  

• Show nanoBench command
• Results:
  • MPERF: 0.96
  • APERF: 1.0
  • UOPS: 1.0

Experiment 3 (with dependency-breaking instructions)

• Instruction: ADC AX, 256
• Chain instruction: TEST R15, R15
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	4d 85 ff             	test   r15,r15
  

• Show nanoBench command
• Results:
  • MPERF: 0.84
  • APERF: 1.0
  • UOPS: 2.0

Experiment 1

• Instruction: ADC AX, 256
• Chain instructions: CMOVC R15W, R15W;MOVSX RAX, R15W;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX
• Chain latency: 6
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	66 45 0f 42 ff       	cmovb  r15w,r15w
     9:	49 0f bf c7          	movsx  rax,r15w
     d:	48 0f bf c0          	movsx  rax,ax
    11:	48 0f bf c0          	movsx  rax,ax
    15:	48 0f bf c0          	movsx  rax,ax
    19:	48 0f bf c0          	movsx  rax,ax
  

• Show nanoBench command
• Results:
  • MPERF: 5.94
  • APERF: 7.0
  • UOPS: 7.0

Experiment 2

• Instruction: ADC AX, 256
• Chain instructions: CMOVZ R15W, R15W;MOVSX RAX, R15W;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX
• Chain latency: 6
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	66 45 0f 44 ff       	cmove  r15w,r15w
     9:	49 0f bf c7          	movsx  rax,r15w
     d:	48 0f bf c0          	movsx  rax,ax
    11:	48 0f bf c0          	movsx  rax,ax
    15:	48 0f bf c0          	movsx  rax,ax
    19:	48 0f bf c0          	movsx  rax,ax
  

• Show nanoBench command
• Results:
  • MPERF: 6.06
  • APERF: 7.0
  • UOPS: 7.0

Experiment 3

• Instruction: ADC AX, 256
• Chain instructions: CMOVS R15W, R15W;MOVSX RAX, R15W;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX
• Chain latency: 6
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	66 45 0f 48 ff       	cmovs  r15w,r15w
     9:	49 0f bf c7          	movsx  rax,r15w
     d:	48 0f bf c0          	movsx  rax,ax
    11:	48 0f bf c0          	movsx  rax,ax
    15:	48 0f bf c0          	movsx  rax,ax
    19:	48 0f bf c0          	movsx  rax,ax
  

• Show nanoBench command
• Results:
  • MPERF: 5.7
  • APERF: 7.0
  • UOPS: 7.0

Experiment 4

• Instruction: ADC AX, 256
• Chain instructions: CMOVO R15W, R15W;MOVSX RAX, R15W;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX
• Chain latency: 6
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	66 45 0f 40 ff       	cmovo  r15w,r15w
     9:	49 0f bf c7          	movsx  rax,r15w
     d:	48 0f bf c0          	movsx  rax,ax
    11:	48 0f bf c0          	movsx  rax,ax
    15:	48 0f bf c0          	movsx  rax,ax
    19:	48 0f bf c0          	movsx  rax,ax
  

• Show nanoBench command
• Results:
  • MPERF: 5.88
  • APERF: 7.0
  • UOPS: 7.0

Experiment 5

• Instruction: ADC AX, 256
• Chain instructions: CMOVP R15W, R15W;MOVSX RAX, R15W;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX
• Chain latency: 6
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	66 45 0f 4a ff       	cmovp  r15w,r15w
     9:	49 0f bf c7          	movsx  rax,r15w
     d:	48 0f bf c0          	movsx  rax,ax
    11:	48 0f bf c0          	movsx  rax,ax
    15:	48 0f bf c0          	movsx  rax,ax
    19:	48 0f bf c0          	movsx  rax,ax
  

• Show nanoBench command
• Results:
  • MPERF: 6.0
  • APERF: 7.0
  • UOPS: 7.0

Experiment 1

• Instruction: ADC AX, 256
• Chain instructions: MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX;MOVSX RAX, AX;TEST AX, AX
• Chain latency: 5
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	48 0f bf c0          	movsx  rax,ax
     8:	48 0f bf c0          	movsx  rax,ax
     c:	48 0f bf c0          	movsx  rax,ax
    10:	48 0f bf c0          	movsx  rax,ax
    14:	66 85 c0             	test   ax,ax
  

• Show nanoBench command
• Results:
  • MPERF: 5.1
  • APERF: 6.0
  • UOPS: 6.0

Experiment 2

• Instruction: ADC AX, 256
• Chain instruction: TEST AX, AX
• Chain latency: 1
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	66 85 c0             	test   ax,ax
  

• Show nanoBench command
• Results:
  • MPERF: 1.68
  • APERF: 2.0
  • UOPS: 2.0

Experiment 3 (with dependency-breaking instructions)

• Instruction: ADC AX, 256
• Chain instructions: TEST AX, AX;;MOV AX, 0
• Chain latency: 1
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	66 85 c0             	test   ax,ax
     7:	66 b8 00 00          	mov    ax,0x0
  

• Show nanoBench command
• Results:
  • MPERF: 1.74
  • APERF: 2.06
  • UOPS: 3.0

Experiment 1

• Instruction: ADC AX, 256
• Chain instructions: CMC;CMC;CMC;CMC
• Chain latency: 4
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	f5                   	cmc    
     5:	f5                   	cmc    
     6:	f5                   	cmc    
     7:	f5                   	cmc    
  

• Show nanoBench command
• Results:
  • MPERF: 4.32
  • APERF: 5.0
  • UOPS: 5.0

Experiment 2

• Instruction: ADC AX, 256
• Code:

     0:	66 15 00 01          	adc    ax,0x100
  

• Show nanoBench command
• Results:
  • MPERF: 0.9
  • APERF: 1.0
  • UOPS: 1.0

Experiment 3 (with dependency-breaking instructions)

• Instruction: ADC AX, 256
• Chain instruction: MOV AX, 0
• Code:

     0:	66 15 00 01          	adc    ax,0x100
     4:	66 b8 00 00          	mov    ax,0x0
  

• Show nanoBench command
• Results:
  • MPERF: 1.62
  • APERF: 2.0
  • UOPS: 2.0