ADD (M8, I8) - Port Usage (IACA 2.3)


With blocking instructions for port 4:

Throughput Analysis Report
--------------------------
Block Throughput: 11.00 Cycles       Throughput Bottleneck: Backend. Port4

Port Binding In Cycles Per Iteration:
-------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |
-------------------------------------------------------------------------
| Cycles | 0.3    0.0  | 0.3  | 6.0    0.5  | 6.0    0.5  | 11.0 | 0.3  |
-------------------------------------------------------------------------


| Num Of |              Ports pressure in cycles               |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |    |
---------------------------------------------------------------------
|   2^   |           |     | 0.5       | 0.5       | 1.0 |     | CP | mov qword ptr [r14+0x40], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x48], r8
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x50], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x58], r8
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x60], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x68], r8
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x70], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x78], r8
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x80], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x88], r8
|   4^   | 0.3       | 0.3 | 1.5   0.5 | 0.5   0.5 | 1.0 | 0.3 | CP | add byte ptr [r14], 0x2
Total Num Of Uops: 24
⇨ One μop that can only use port 4

With blocking instructions for ports {2, 3}:

Throughput Analysis Report
--------------------------
Block Throughput: 6.00 Cycles       Throughput Bottleneck: Backend. PORT2_AGU, PORT3_AGU

Port Binding In Cycles Per Iteration:
-------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |
-------------------------------------------------------------------------
| Cycles | 0.3    0.0  | 0.3  | 6.0    5.5  | 6.0    5.5  | 1.0  | 0.3  |
-------------------------------------------------------------------------


| Num Of |              Ports pressure in cycles               |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |    |
---------------------------------------------------------------------
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm0, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm1, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm2, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm3, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm4, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm5, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm6, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm7, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm8, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm9, xmmword ptr [r14+0x40]
|   4^   | 0.3       | 0.3 | 1.0   0.5 | 1.0   0.5 | 1.0 | 0.3 | CP | add byte ptr [r14], 0x2
Total Num Of Uops: 14
⇨ 2 μops that can only use ports {2, 3}

With blocking instructions for ports {0, 1, 5}:

Throughput Analysis Report
--------------------------
Block Throughput: 4.35 Cycles       Throughput Bottleneck: Backend. Port0, Port1, Port5

Port Binding In Cycles Per Iteration:
-------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |
-------------------------------------------------------------------------
| Cycles | 4.3    0.0  | 4.3  | 1.0    0.5  | 1.0    0.5  | 1.0  | 4.3  |
-------------------------------------------------------------------------


| Num Of |              Ports pressure in cycles               |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |    |
---------------------------------------------------------------------
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm0, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm2, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm3, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm4, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm5, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm6, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm7, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm8, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm9, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm10, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm11, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm12, xmm1
|   4^   | 0.3       | 0.3 | 1.0   0.5 | 1.0   0.5 | 1.0 | 0.3 | CP | add byte ptr [r14], 0x2
Total Num Of Uops: 16
⇨ One μop that can only use ports {0, 1, 5}

With an indexed addressing mode


With blocking instructions for port 4:

Throughput Analysis Report
--------------------------
Block Throughput: 11.00 Cycles       Throughput Bottleneck: Backend. Port4

Port Binding In Cycles Per Iteration:
-------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |
-------------------------------------------------------------------------
| Cycles | 0.3    0.0  | 0.3  | 6.0    0.5  | 6.0    0.5  | 11.0 | 0.3  |
-------------------------------------------------------------------------


| Num Of |              Ports pressure in cycles               |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |    |
---------------------------------------------------------------------
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x40], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x48], r8
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x50], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x58], r8
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x60], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x68], r8
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x70], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x78], r8
|   2^   |           |     | 1.0       |           | 1.0 |     | CP | mov qword ptr [r14+0x80], r8
|   2^   |           |     |           | 1.0       | 1.0 |     | CP | mov qword ptr [r14+0x88], r8
|   4    | 0.3       | 0.3 | 1.0   0.5 | 1.0   0.5 | 1.0 | 0.3 | CP | add byte ptr [r14+r13*1], 0x2
Total Num Of Uops: 24
⇨ One μop that can only use port 4

With blocking instructions for ports {2, 3}:

Throughput Analysis Report
--------------------------
Block Throughput: 6.00 Cycles       Throughput Bottleneck: Backend. PORT2_AGU, PORT3_AGU

Port Binding In Cycles Per Iteration:
-------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |
-------------------------------------------------------------------------
| Cycles | 0.3    0.0  | 0.3  | 6.0    5.5  | 6.0    5.5  | 1.0  | 0.3  |
-------------------------------------------------------------------------


| Num Of |              Ports pressure in cycles               |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |    |
---------------------------------------------------------------------
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm0, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm1, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm2, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm3, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm4, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm5, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm6, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm7, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm8, xmmword ptr [r14+0x40]
|   1    |           |     | 0.5   0.5 | 0.5   0.5 |     |     | CP | lddqu xmm9, xmmword ptr [r14+0x40]
|   4    | 0.3       | 0.3 | 1.0   0.5 | 1.0   0.5 | 1.0 | 0.3 | CP | add byte ptr [r14+r13*1], 0x2
Total Num Of Uops: 14
⇨ 2 μops that can only use ports {2, 3}

With blocking instructions for ports {0, 1, 5}:

Throughput Analysis Report
--------------------------
Block Throughput: 4.35 Cycles       Throughput Bottleneck: FrontEnd

Port Binding In Cycles Per Iteration:
-------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |
-------------------------------------------------------------------------
| Cycles | 4.3    0.0  | 4.3  | 1.0    0.5  | 1.0    0.5  | 1.0  | 4.3  |
-------------------------------------------------------------------------


| Num Of |              Ports pressure in cycles               |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |    |
---------------------------------------------------------------------
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm0, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm2, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm3, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm4, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm5, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm6, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm7, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm8, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm9, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm10, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm11, xmm1
|   1    | 0.3       | 0.3 |           |           |     | 0.3 | CP | movq xmm12, xmm1
|   4    | 0.3       | 0.3 | 1.0   0.5 | 1.0   0.5 | 1.0 | 0.3 | CP | add byte ptr [r14+r13*1], 0x2
Total Num Of Uops: 16
⇨ One μop that can only use ports {0, 1, 5}