BZHI (R32, R32, R32)

With unroll_count=500 and no inner loop

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 0.29
- APERF: 0.31
- UOPS: 1.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=10

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 0.35
- APERF: 0.4
- UOPS: 1.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=100

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 0.42
- APERF: 0.48
- UOPS: 1.02
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 4 independent instructions

With unroll_count=200 and no inner loop

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 1.16
- APERF: 1.34
- UOPS: 4.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=2

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 1.73
- APERF: 2.0
- UOPS: 5.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=20

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 1.83
- APERF: 2.1
- UOPS: 4.1
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 8 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d
  14:	c4 42 28 f5 f1       	bzhi   r14d,r9d,r10d
  19:	c4 c2 28 f5 d9       	bzhi   ebx,r9d,r10d
  1e:	c4 c2 28 f5 c9       	bzhi   ecx,r9d,r10d
  23:	c4 c2 28 f5 d1       	bzhi   edx,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 2.32
- APERF: 2.67
- UOPS: 8.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=1

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d
  14:	c4 42 28 f5 f1       	bzhi   r14d,r9d,r10d
  19:	c4 c2 28 f5 d9       	bzhi   ebx,r9d,r10d
  1e:	c4 c2 28 f5 c9       	bzhi   ecx,r9d,r10d
  23:	c4 c2 28 f5 d1       	bzhi   edx,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 3.47
- APERF: 3.99
- UOPS: 10.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=10

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d
  14:	c4 42 28 f5 f1       	bzhi   r14d,r9d,r10d
  19:	c4 c2 28 f5 d9       	bzhi   ebx,r9d,r10d
  1e:	c4 c2 28 f5 c9       	bzhi   ecx,r9d,r10d
  23:	c4 c2 28 f5 d1       	bzhi   edx,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 3.66
- APERF: 4.21
- UOPS: 8.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With 11 independent instructions

With unroll_count=100 and no inner loop

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d
  14:	c4 42 28 f5 f1       	bzhi   r14d,r9d,r10d
  19:	c4 c2 28 f5 d9       	bzhi   ebx,r9d,r10d
  1e:	c4 c2 28 f5 c9       	bzhi   ecx,r9d,r10d
  23:	c4 c2 28 f5 d1       	bzhi   edx,r9d,r10d
  28:	c4 c2 28 f5 f9       	bzhi   edi,r9d,r10d
  2d:	c4 c2 28 f5 f1       	bzhi   esi,r9d,r10d
  32:	c4 c2 28 f5 e9       	bzhi   ebp,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 2.89
- APERF: 3.42
- UOPS: 11.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=1

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d
  14:	c4 42 28 f5 f1       	bzhi   r14d,r9d,r10d
  19:	c4 c2 28 f5 d9       	bzhi   ebx,r9d,r10d
  1e:	c4 c2 28 f5 c9       	bzhi   ecx,r9d,r10d
  23:	c4 c2 28 f5 d1       	bzhi   edx,r9d,r10d
  28:	c4 c2 28 f5 f9       	bzhi   edi,r9d,r10d
  2d:	c4 c2 28 f5 f1       	bzhi   esi,r9d,r10d
  32:	c4 c2 28 f5 e9       	bzhi   ebp,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 3.49
- APERF: 4.0
- UOPS: 13.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=10

Code:

   0:	c4 42 28 f5 c1       	bzhi   r8d,r9d,r10d
   5:	c4 42 28 f5 d9       	bzhi   r11d,r9d,r10d
   a:	c4 42 28 f5 e1       	bzhi   r12d,r9d,r10d
   f:	c4 42 28 f5 e9       	bzhi   r13d,r9d,r10d
  14:	c4 42 28 f5 f1       	bzhi   r14d,r9d,r10d
  19:	c4 c2 28 f5 d9       	bzhi   ebx,r9d,r10d
  1e:	c4 c2 28 f5 c9       	bzhi   ecx,r9d,r10d
  23:	c4 c2 28 f5 d1       	bzhi   edx,r9d,r10d
  28:	c4 c2 28 f5 f9       	bzhi   edi,r9d,r10d
  2d:	c4 c2 28 f5 f1       	bzhi   esi,r9d,r10d
  32:	c4 c2 28 f5 e9       	bzhi   ebp,r9d,r10d

Init:

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

Show nanoBench command
Results:
- MPERF: 4.45
- APERF: 5.11
- UOPS: 11.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With the same register for for different operands

With unroll_count=500 and no inner loop

Code:

   0:	c4 42 38 f5 c0       	bzhi   r8d,r8d,r8d

Init:

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

Show nanoBench command
Results:
- MPERF: 0.88
- APERF: 1.0
- UOPS: 1.0
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=1000 and unroll_count=10

Code:

   0:	c4 42 38 f5 c0       	bzhi   r8d,r8d,r8d

Init:

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

Show nanoBench command
Results:
- MPERF: 0.87
- APERF: 1.0
- UOPS: 1.2
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

With loop_count=100 and unroll_count=100

Code:

   0:	c4 42 38 f5 c0       	bzhi   r8d,r8d,r8d

Init:

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

Show nanoBench command
Results:
- MPERF: 0.87
- APERF: 1.0
- UOPS: 1.02
- FpuPipeAssignment.Total0: 0.0
- FpuPipeAssignment.Total1: 0.0
- FpuPipeAssignment.Total2: 0.0
- FpuPipeAssignment.Total3: 0.0
- DIV_CYCLES: 0.0

BZHI (R32, R32, R32) - Throughput and Uops

With different registers for different operands

With 1 independent instruction

With unroll_count=500 and no inner loop

With loop_count=1000 and unroll_count=10

With loop_count=100 and unroll_count=100

With 4 independent instructions

With unroll_count=200 and no inner loop

With loop_count=1000 and unroll_count=2

With loop_count=100 and unroll_count=20

With 8 independent instructions

With unroll_count=100 and no inner loop

With loop_count=1000 and unroll_count=1

With loop_count=100 and unroll_count=10

With 11 independent instructions

With unroll_count=100 and no inner loop

With loop_count=1000 and unroll_count=1

With loop_count=100 and unroll_count=10

With the same register for for different operands

With unroll_count=500 and no inner loop

With loop_count=1000 and unroll_count=10

With loop_count=100 and unroll_count=100