KMOVD (K, R32) - Latency

Experiment 1

• Instruction: KMOVD K1, R8D
• Chain instruction: KMOVB R8D, K1
• Chain latency: ≥1
• Code:

     0:	c4 c1 7b 92 c8       	kmovd  k1,r8d
     5:	c5 79 93 c1          	kmovb  r8d,k1
  

• Init:

  MOV R15, 10000;
  L: VADDPS YMM0, YMM1, YMM1;
  VADDPS YMM0, YMM1, YMM1;
  DEC R15;
  JNZ L;
  VZEROALL

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 4.0
  • Reference cycles: 1.24
  • UOPS_EXECUTED.THREAD: 2.0

Experiment 2

• Instruction: KMOVD K1, R8D
• Chain instruction: KMOVD R8D, K1
• Chain latency: ≥1
• Code:

     0:	c4 c1 7b 92 c8       	kmovd  k1,r8d
     5:	c5 7b 93 c1          	kmovd  r8d,k1
  

• Init:

  MOV R15, 10000;
  L: VADDPS YMM0, YMM1, YMM1;
  VADDPS YMM0, YMM1, YMM1;
  DEC R15;
  JNZ L;
  VZEROALL

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 4.0
  • Reference cycles: 1.4
  • UOPS_EXECUTED.THREAD: 2.0

Experiment 3

• Instruction: KMOVD K1, R8D
• Chain instruction: KMOVQ R8, K1
• Chain latency: ≥1
• Code:

     0:	c4 c1 7b 92 c8       	kmovd  k1,r8d
     5:	c4 61 fb 93 c1       	kmovq  r8,k1
  

• Init:

  MOV R15, 10000;
  L: VADDPS YMM0, YMM1, YMM1;
  VADDPS YMM0, YMM1, YMM1;
  DEC R15;
  JNZ L;
  VZEROALL

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 4.0
  • Reference cycles: 1.34
  • UOPS_EXECUTED.THREAD: 2.0

Experiment 4

• Instruction: KMOVD K1, R8D
• Chain instruction: KMOVW R8D, K1
• Chain latency: ≥1
• Code:

     0:	c4 c1 7b 92 c8       	kmovd  k1,r8d
     5:	c5 78 93 c1          	kmovw  r8d,k1
  

• Init:

  MOV R15, 10000;
  L: VADDPS YMM0, YMM1, YMM1;
  VADDPS YMM0, YMM1, YMM1;
  DEC R15;
  JNZ L;
  VZEROALL

• Show nanoBench command
• Results:
  • Instructions retired: 2.0
  • Core cycles: 4.0
  • Reference cycles: 1.4
  • UOPS_EXECUTED.THREAD: 2.0