IDIV (R8l)

Experiment 1 (fast division)

Instruction: IDIV BL
Chain instructions: AND BL, AL; AND BL, CL; OR BL, CL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; ; MOV AX, R8W
Chain latency: 11

Code:

   0:	f6 fb                	idiv   bl
   2:	20 c3                	and    bl,al
   4:	20 cb                	and    bl,cl
   6:	08 cb                	or     bl,cl
   8:	08 db                	or     bl,bl
   a:	08 db                	or     bl,bl
   c:	08 db                	or     bl,bl
   e:	08 db                	or     bl,bl
  10:	08 db                	or     bl,bl
  12:	08 db                	or     bl,bl
  14:	08 db                	or     bl,bl
  16:	08 db                	or     bl,bl
  18:	66 44 89 c0          	mov    ax,r8w

Init:

MOV R8, 0;
MOV R9, 0;
MOV RCX, 1;
MOV BL, CL;
MOV RAX, R8;
MOV RDX, R9

Show nanoBench command
Results:
- Instructions retired: 13.0
- Core cycles: 23.03
- Reference cycles: 23.03
- RS_UOPS_DISPATCHED: 18.0

Experiment 2 (slow division)

Instruction: IDIV BL
Chain instructions: AND BL, AL; AND BL, CL; OR BL, CL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; OR BL, BL; ; MOV AX, R8W
Chain latency: 11

Code:

   0:	f6 fb                	idiv   bl
   2:	20 c3                	and    bl,al
   4:	20 cb                	and    bl,cl
   6:	08 cb                	or     bl,cl
   8:	08 db                	or     bl,bl
   a:	08 db                	or     bl,bl
   c:	08 db                	or     bl,bl
   e:	08 db                	or     bl,bl
  10:	08 db                	or     bl,bl
  12:	08 db                	or     bl,bl
  14:	08 db                	or     bl,bl
  16:	08 db                	or     bl,bl
  18:	66 44 89 c0          	mov    ax,r8w

Init:

MOV R8, 13057;
MOV R9, 0;
MOV RCX, 123;
MOV BL, CL;
MOV RAX, R8;
MOV RDX, R9

Show nanoBench command
Results:
- Instructions retired: 13.0
- Core cycles: 28.03
- Reference cycles: 28.04
- RS_UOPS_DISPATCHED: 18.0

Experiment 1 (fast division)

Instruction: IDIV BL
Chain instructions: AND AX, R8W; OR AX, R8W; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; ;
Chain latency: 10

Code:

   0:	f6 fb                	idiv   bl
   2:	66 44 21 c0          	and    ax,r8w
   6:	66 44 09 c0          	or     ax,r8w
   a:	66 09 c0             	or     ax,ax
   d:	66 09 c0             	or     ax,ax
  10:	66 09 c0             	or     ax,ax
  13:	66 09 c0             	or     ax,ax
  16:	66 09 c0             	or     ax,ax
  19:	66 09 c0             	or     ax,ax
  1c:	66 09 c0             	or     ax,ax
  1f:	66 09 c0             	or     ax,ax

Init:

MOV R8, 0;
MOV R9, 0;
MOV RCX, 1;
MOV BL, CL;
MOV RAX, R8;
MOV RDX, R9

Show nanoBench command
Results:
- Instructions retired: 11.0
- Core cycles: 22.22
- Reference cycles: 22.23
- RS_UOPS_DISPATCHED: 16.0

Experiment 2 (slow division)

Instruction: IDIV BL
Chain instructions: AND AX, R8W; OR AX, R8W; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; OR AX, AX; ;
Chain latency: 10

Code:

   0:	f6 fb                	idiv   bl
   2:	66 44 21 c0          	and    ax,r8w
   6:	66 44 09 c0          	or     ax,r8w
   a:	66 09 c0             	or     ax,ax
   d:	66 09 c0             	or     ax,ax
  10:	66 09 c0             	or     ax,ax
  13:	66 09 c0             	or     ax,ax
  16:	66 09 c0             	or     ax,ax
  19:	66 09 c0             	or     ax,ax
  1c:	66 09 c0             	or     ax,ax
  1f:	66 09 c0             	or     ax,ax

Init:

MOV R8, 13057;
MOV R9, 0;
MOV RCX, 123;
MOV BL, CL;
MOV RAX, R8;
MOV RDX, R9

Show nanoBench command
Results:
- Instructions retired: 11.0
- Core cycles: 27.22
- Reference cycles: 27.2
- RS_UOPS_DISPATCHED: 16.0

IDIV (R8l) - Latency

Operands

Latency operand 1 → 2: 12 ≤ lat ≤ 17

Latency operand 2 → 2: 12 ≤ lat ≤ 17

Latency operand 1 → 2: 12 ≤ lat ≤ 17

Experiment 1 (fast division)

Experiment 2 (slow division)

Latency operand 2 → 2: 12 ≤ lat ≤ 17

Experiment 1 (fast division)

Experiment 2 (slow division)