VRSQRTSS (XMM, XMM, XMM)

Experiment 1

Instruction: VRSQRTSS XMM0, XMM2, XMM1
Chain instructions: VORPS XMM2, XMM0, XMM0; VORPS XMM2, XMM2, XMM1; VANDPS XMM2, XMM2, XMM1; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2;
Chain latency: ≥7

Code:

   0:	c5 ea 52 c1          	vrsqrtss xmm0,xmm2,xmm1
   4:	c5 f8 56 d0          	vorps  xmm2,xmm0,xmm0
   8:	c5 e8 56 d1          	vorps  xmm2,xmm2,xmm1
   c:	c5 e8 54 d1          	vandps xmm2,xmm2,xmm1
  10:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  14:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  18:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  1c:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2

Init:

MOV R15, 10000;
L: VADDPS YMM0, YMM1, YMM1;
VADDPS YMM0, YMM1, YMM1;
DEC R15;
JNZ L;
VZEROALL;
MOV RAX, 0x72d30ff172d30ff1;
MOV [R14+0], RAX;
MOV [R14+8], RAX;
VMOVUPS XMM2, [R14];
VMOVUPS XMM1, [R14]

Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 12.73
- Reference cycles: 11.68
- UOPS_EXECUTED.THREAD: 8.0

Experiment 2

Instruction: VRSQRTSS XMM2, XMM2, XMM0

Code:

   0:	c5 ea 52 d0          	vrsqrtss xmm2,xmm2,xmm0

Init:

MOV R15, 10000;
L: VADDPS YMM0, YMM1, YMM1;
VADDPS YMM0, YMM1, YMM1;
DEC R15;
JNZ L;
VZEROALL;
MOV RAX, 0x3f8000003f800000;
MOV [R14+0], RAX;
MOV [R14+8], RAX;
VMOVUPS XMM2, [R14];
VMOVUPS XMM1, [R14]

Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 4.0
- Reference cycles: 3.65
- UOPS_EXECUTED.THREAD: 1.01

Experiment 3

Instruction: VRSQRTSS XMM0, XMM2, XMM1
Chain instructions: VORPS XMM2, XMM0, XMM0; VORPS XMM2, XMM2, XMM1; VANDPS XMM2, XMM2, XMM1; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2;
Chain latency: ≥7

Code:

   0:	c5 ea 52 c1          	vrsqrtss xmm0,xmm2,xmm1
   4:	c5 f8 56 d0          	vorps  xmm2,xmm0,xmm0
   8:	c5 e8 56 d1          	vorps  xmm2,xmm2,xmm1
   c:	c5 e8 54 d1          	vandps xmm2,xmm2,xmm1
  10:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  14:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  18:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  1c:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2

Init:

MOV R15, 10000;
L: VADDPS YMM0, YMM1, YMM1;
VADDPS YMM0, YMM1, YMM1;
DEC R15;
JNZ L;
VZEROALL;
MOV RAX, 0x3f8000003f800000;
MOV [R14+0], RAX;
MOV [R14+8], RAX;
VMOVUPS XMM2, [R14];
VMOVUPS XMM1, [R14]

Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 12.73
- Reference cycles: 11.68
- UOPS_EXECUTED.THREAD: 8.0

Experiment 1

Instruction: VRSQRTSS XMM0, XMM1, XMM2
Chain instructions: VORPS XMM2, XMM0, XMM0; VORPS XMM2, XMM2, XMM1; VANDPS XMM2, XMM2, XMM1; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2;
Chain latency: ≥7

Code:

   0:	c5 f2 52 c2          	vrsqrtss xmm0,xmm1,xmm2
   4:	c5 f8 56 d0          	vorps  xmm2,xmm0,xmm0
   8:	c5 e8 56 d1          	vorps  xmm2,xmm2,xmm1
   c:	c5 e8 54 d1          	vandps xmm2,xmm2,xmm1
  10:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  14:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  18:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  1c:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2

Init:

MOV R15, 10000;
L: VADDPS YMM0, YMM1, YMM1;
VADDPS YMM0, YMM1, YMM1;
DEC R15;
JNZ L;
VZEROALL;
MOV RAX, 0x72d30ff172d30ff1;
MOV [R14+0], RAX;
MOV [R14+8], RAX;
VMOVUPS XMM2, [R14];
VMOVUPS XMM1, [R14]

Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 12.78
- Reference cycles: 11.68
- UOPS_EXECUTED.THREAD: 8.0

Experiment 2

Instruction: VRSQRTSS XMM2, XMM0, XMM2

Code:

   0:	c5 fa 52 d2          	vrsqrtss xmm2,xmm0,xmm2

Init:

MOV R15, 10000;
L: VADDPS YMM0, YMM1, YMM1;
VADDPS YMM0, YMM1, YMM1;
DEC R15;
JNZ L;
VZEROALL;
MOV RAX, 0x3f8000003f800000;
MOV [R14+0], RAX;
MOV [R14+8], RAX;
VMOVUPS XMM2, [R14];
VMOVUPS XMM1, [R14]

Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 4.0
- Reference cycles: 3.65
- UOPS_EXECUTED.THREAD: 0.99

Experiment 3

Instruction: VRSQRTSS XMM0, XMM1, XMM2
Chain instructions: VORPS XMM2, XMM0, XMM0; VORPS XMM2, XMM2, XMM1; VANDPS XMM2, XMM2, XMM1; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2; VORPS XMM2, XMM2, XMM2;
Chain latency: ≥7

Code:

   0:	c5 f2 52 c2          	vrsqrtss xmm0,xmm1,xmm2
   4:	c5 f8 56 d0          	vorps  xmm2,xmm0,xmm0
   8:	c5 e8 56 d1          	vorps  xmm2,xmm2,xmm1
   c:	c5 e8 54 d1          	vandps xmm2,xmm2,xmm1
  10:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  14:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  18:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2
  1c:	c5 e8 56 d2          	vorps  xmm2,xmm2,xmm2

Init:

MOV R15, 10000;
L: VADDPS YMM0, YMM1, YMM1;
VADDPS YMM0, YMM1, YMM1;
DEC R15;
JNZ L;
VZEROALL;
MOV RAX, 0x3f8000003f800000;
MOV [R14+0], RAX;
MOV [R14+8], RAX;
VMOVUPS XMM2, [R14];
VMOVUPS XMM1, [R14]

Show nanoBench command
Results:
- Instructions retired: 8.0
- Core cycles: 12.37
- Reference cycles: 11.68
- UOPS_EXECUTED.THREAD: 8.0

VRSQRTSS (XMM, XMM, XMM) - Latency

Operands

Latency operand 2 → 1: ≤4

Latency operand 3 → 1: ≤4

Latency operand 2 → 1: ≤4

Experiment 1

Experiment 2

Experiment 3

Latency operand 3 → 1: ≤4

Experiment 1

Experiment 2

Experiment 3