KMOVW (R32, K) - Latency

Experiment 1

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

     0:	c5 78 93 c1          	kmovw  r8d,k1
     4:	c4 c1 79 92 c8       	kmovb  k1,r8d
  

• 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: 3.89
  • UOPS_EXECUTED.THREAD: 2.0

Experiment 2

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

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

• 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: 2.92
  • UOPS_EXECUTED.THREAD: 2.0

Experiment 3

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

     0:	c5 78 93 c1          	kmovw  r8d,k1
     4:	c4 c1 fb 92 c8       	kmovq  k1,r8
  

• 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: 3.16
  • UOPS_EXECUTED.THREAD: 2.0

Experiment 4

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

     0:	c5 78 93 c1          	kmovw  r8d,k1
     4:	c4 c1 78 92 c8       	kmovw  k1,r8d
  

• 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: 3.65
  • UOPS_EXECUTED.THREAD: 2.0