KMOVW (K, K) - Latency

Experiment 1

• Instruction: KMOVW K2, K1
• Chain instruction: KMOVW K1, K2
• Code:

     0:	c5 f8 90 d1          	kmovw  k2,k1
     4:	c5 f8 90 ca          	kmovw  k1,k2
  

• 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: 2.01
  • Reference cycles: 0.62
  • UOPS_EXECUTED.THREAD: 2.0

Experiment 2

• Instruction: KMOVW K2, K1
• Chain instructions: KMOVQ K1, K2;KMOVQ K1, K1;KMOVQ K1, K1;KMOVQ K1, K1;KMOVQ K1, K1
• Chain latency: 5
• Code:

     0:	c5 f8 90 d1          	kmovw  k2,k1
     4:	c4 e1 f8 90 ca       	kmovq  k1,k2
     9:	c4 e1 f8 90 c9       	kmovq  k1,k1
     e:	c4 e1 f8 90 c9       	kmovq  k1,k1
    13:	c4 e1 f8 90 c9       	kmovq  k1,k1
    18:	c4 e1 f8 90 c9       	kmovq  k1,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: 6.0
  • Core cycles: 5.99
  • Reference cycles: 2.07
  • UOPS_EXECUTED.THREAD: 6.0