ADD (M8, I8) - Port Usage (IACA 3.0)


With blocking instructions for port 4:

Throughput Analysis Report
--------------------------
Block Throughput: 11.00 Cycles       Throughput Bottleneck: Backend
Loop Count:  22
Port Binding In Cycles Per Iteration:
--------------------------------------------------------------------------------------------------
|  Port  |   0   -  DV   |   1   |   2   -  D    |   3   -  D    |   4   |   5   |   6   |   7   |
--------------------------------------------------------------------------------------------------
| Cycles |  0.3     0.0  |  0.3  |  4.0     0.0  |  4.0     1.0  | 11.0  |  0.3  |  0.2  |  4.0  |
--------------------------------------------------------------------------------------------------

| Num Of   |                    Ports pressure in cycles                         |      |
|  Uops    |  0  - DV    |  1   |  2  -  D    |  3  -  D    |  4   |  5   |  6   |  7   |
-----------------------------------------------------------------------------------------
|   2^     |             |      | 1.0         |             | 1.0  |      |      |      | mov qword ptr [r14+0x40], r8
|   2^     |             |      |             | 1.0         | 1.0  |      |      |      | mov qword ptr [r14+0x48], r8
|   2^     |             |      |             |             | 1.0  |      |      | 1.0  | mov qword ptr [r14+0x50], r8
|   2^     |             |      | 1.0         |             | 1.0  |      |      |      | mov qword ptr [r14+0x58], r8
|   2^     |             |      |             | 1.0         | 1.0  |      |      |      | mov qword ptr [r14+0x60], r8
|   2^     |             |      |             |             | 1.0  |      |      | 1.0  | mov qword ptr [r14+0x68], r8
|   2^     |             |      | 1.0         |             | 1.0  |      |      |      | mov qword ptr [r14+0x70], r8
|   2^     |             |      |             | 1.0         | 1.0  |      |      |      | mov qword ptr [r14+0x78], r8
|   2^     |             |      |             |             | 1.0  |      |      | 1.0  | mov qword ptr [r14+0x80], r8
|   2^     |             |      | 1.0         |             | 1.0  |      |      |      | mov qword ptr [r14+0x88], r8
|   4^     | 0.3         | 0.3  |             | 1.0     1.0 | 1.0  | 0.3  | 0.2  | 1.0  | 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: 5.51 Cycles       Throughput Bottleneck: Backend
Loop Count:  38
Port Binding In Cycles Per Iteration:
--------------------------------------------------------------------------------------------------
|  Port  |   0   -  DV   |   1   |   2   -  D    |   3   -  D    |   4   |   5   |   6   |   7   |
--------------------------------------------------------------------------------------------------
| Cycles |  0.3     0.0  |  0.3  |  5.5     5.5  |  5.5     5.5  |  1.0  |  0.3  |  0.2  |  1.0  |
--------------------------------------------------------------------------------------------------

| Num Of   |                    Ports pressure in cycles                         |      |
|  Uops    |  0  - DV    |  1   |  2  -  D    |  3  -  D    |  4   |  5   |  6   |  7   |
-----------------------------------------------------------------------------------------
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm0, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm1, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm2, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm3, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm4, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm5, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm6, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm7, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm8, xmmword ptr [r14+0x40]
|   1^     |             |      | 0.5     0.5 | 0.5     0.5 |      |      |      |      | lddqu xmm9, xmmword ptr [r14+0x40]
|   4^     | 0.3         | 0.3  | 0.5     0.5 | 0.5     0.5 | 1.0  | 0.3  | 0.2  | 1.0  | add byte ptr [r14], 0x2
Total Num Of Uops: 14
⇨ One μop that can only use ports {2, 3}

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

Throughput Analysis Report
--------------------------
Block Throughput: 3.58 Cycles       Throughput Bottleneck: FrontEnd
Loop Count:  22
Port Binding In Cycles Per Iteration:
--------------------------------------------------------------------------------------------------
|  Port  |   0   -  DV   |   1   |   2   -  D    |   3   -  D    |   4   |   5   |   6   |   7   |
--------------------------------------------------------------------------------------------------
| Cycles |  4.0     0.0  |  4.0  |  0.7     0.7  |  0.6     0.6  |  1.0  |  4.0  |  1.0  |  0.7  |
--------------------------------------------------------------------------------------------------

| Num Of   |                    Ports pressure in cycles                         |      |
|  Uops    |  0  - DV    |  1   |  2  -  D    |  3  -  D    |  4   |  5   |  6   |  7   |
-----------------------------------------------------------------------------------------
|   1      | 1.0         |      |             |             |      |      |      |      | blendpd xmm0, xmm1, 0x2
|   1      |             | 1.0  |             |             |      |      |      |      | blendpd xmm2, xmm1, 0x2
|   1      |             |      |             |             |      | 1.0  |      |      | blendpd xmm3, xmm1, 0x2
|   1      | 1.0         |      |             |             |      |      |      |      | blendpd xmm4, xmm1, 0x2
|   1      |             | 1.0  |             |             |      |      |      |      | blendpd xmm5, xmm1, 0x2
|   1      |             |      |             |             |      | 1.0  |      |      | blendpd xmm6, xmm1, 0x2
|   1      | 1.0         |      |             |             |      |      |      |      | blendpd xmm7, xmm1, 0x2
|   1      |             | 1.0  |             |             |      |      |      |      | blendpd xmm8, xmm1, 0x2
|   1      |             |      |             |             |      | 1.0  |      |      | blendpd xmm9, xmm1, 0x2
|   1      | 1.0         |      |             |             |      |      |      |      | blendpd xmm10, xmm1, 0x2
|   1      |             | 1.0  |             |             |      |      |      |      | blendpd xmm11, xmm1, 0x2
|   1      |             |      |             |             |      | 1.0  |      |      | blendpd xmm12, xmm1, 0x2
|   4^     |             |      | 0.7     0.7 | 0.6     0.6 | 1.0  |      | 1.0  | 0.7  | add byte ptr [r14], 0x2
Total Num Of Uops: 16

With blocking instructions for ports {2, 3, 7}:

Throughput Analysis Report
--------------------------
Block Throughput: 13.00 Cycles       Throughput Bottleneck: Backend
Loop Count:  22
Port Binding In Cycles Per Iteration:
--------------------------------------------------------------------------------------------------
|  Port  |   0   -  DV   |   1   |   2   -  D    |   3   -  D    |   4   |   5   |   6   |   7   |
--------------------------------------------------------------------------------------------------
| Cycles |  0.3     0.0  |  0.3  |  4.7     0.7  |  4.6     0.6  | 13.0  |  0.3  |  0.2  |  4.7  |
--------------------------------------------------------------------------------------------------

| Num Of   |                    Ports pressure in cycles                         |      |
|  Uops    |  0  - DV    |  1   |  2  -  D    |  3  -  D    |  4   |  5   |  6   |  7   |
-----------------------------------------------------------------------------------------
|   2^     |             |      | 0.3         | 0.3         | 1.0  |      |      | 0.4  | mov qword ptr [r14+0x40], r8
|   2^     |             |      | 0.4         | 0.3         | 1.0  |      |      | 0.3  | mov qword ptr [r14+0x48], r8
|   2^     |             |      | 0.3         | 0.4         | 1.0  |      |      | 0.3  | mov qword ptr [r14+0x50], r8
|   2^     |             |      | 0.3         | 0.3         | 1.0  |      |      | 0.4  | mov qword ptr [r14+0x58], r8
|   2^     |             |      | 0.4         | 0.3         | 1.0  |      |      | 0.3  | mov qword ptr [r14+0x60], r8
|   2^     |             |      | 0.3         | 0.4         | 1.0  |      |      | 0.3  | mov qword ptr [r14+0x68], r8
|   2^     |             |      | 0.3         | 0.3         | 1.0  |      |      | 0.4  | mov qword ptr [r14+0x70], r8
|   2^     |             |      | 0.4         | 0.3         | 1.0  |      |      | 0.3  | mov qword ptr [r14+0x78], r8
|   2^     |             |      | 0.3         | 0.4         | 1.0  |      |      | 0.3  | mov qword ptr [r14+0x80], r8
|   2^     |             |      | 0.3         | 0.3         | 1.0  |      |      | 0.4  | mov qword ptr [r14+0x88], r8
|   2^     |             |      | 0.4         | 0.3         | 1.0  |      |      | 0.3  | mov qword ptr [r14+0x90], r8
|   2^     |             |      | 0.3         | 0.4         | 1.0  |      |      | 0.3  | mov qword ptr [r14+0x98], r8
|   4^     | 0.3         | 0.3  | 0.7     0.7 | 0.6     0.6 | 1.0  | 0.3  | 0.2  | 0.7  | add byte ptr [r14], 0x2
Total Num Of Uops: 28
⇨ One μop that can only use ports {2, 3, 7}

With blocking instructions for ports {0, 1, 5, 6}:

Throughput Analysis Report
--------------------------
Block Throughput: 4.53 Cycles       Throughput Bottleneck: FrontEnd
Loop Count:  22
Port Binding In Cycles Per Iteration:
--------------------------------------------------------------------------------------------------
|  Port  |   0   -  DV   |   1   |   2   -  D    |   3   -  D    |   4   |   5   |   6   |   7   |
--------------------------------------------------------------------------------------------------
| Cycles |  4.3     0.0  |  4.3  |  0.7     0.7  |  0.6     0.6  |  1.0  |  4.3  |  4.2  |  0.7  |
--------------------------------------------------------------------------------------------------

| Num Of   |                    Ports pressure in cycles                         |      |
|  Uops    |  0  - DV    |  1   |  2  -  D    |  3  -  D    |  4   |  5   |  6   |  7   |
-----------------------------------------------------------------------------------------
|   1      | 0.3         | 0.3  |             |             |      | 0.3  | 0.2  |      | mov bh, 0x0
|   1      | 0.2         | 0.3  |             |             |      | 0.3  | 0.3  |      | mov ch, 0x0
|   1      | 0.3         | 0.2  |             |             |      | 0.3  | 0.3  |      | mov dh, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.2  | 0.3  |      | mov ah, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.3  | 0.2  |      | mov bh, 0x0
|   1      | 0.2         | 0.3  |             |             |      | 0.3  | 0.3  |      | mov ch, 0x0
|   1      | 0.3         | 0.2  |             |             |      | 0.3  | 0.3  |      | mov dh, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.2  | 0.3  |      | mov ah, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.3  | 0.2  |      | mov bh, 0x0
|   1      | 0.2         | 0.3  |             |             |      | 0.3  | 0.3  |      | mov ch, 0x0
|   1      | 0.3         | 0.2  |             |             |      | 0.3  | 0.3  |      | mov dh, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.2  | 0.3  |      | mov ah, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.3  | 0.2  |      | mov bh, 0x0
|   1      | 0.2         | 0.3  |             |             |      | 0.3  | 0.3  |      | mov ch, 0x0
|   1      | 0.3         | 0.2  |             |             |      | 0.3  | 0.3  |      | mov dh, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.2  | 0.3  |      | mov ah, 0x0
|   4^     | 0.3         | 0.3  | 0.7     0.7 | 0.6     0.6 | 1.0  | 0.3  | 0.2  | 0.7  | add byte ptr [r14], 0x2
Total Num Of Uops: 20
⇨ One μop that can only use ports {0, 1, 5, 6}

With an indexed addressing mode


With blocking instructions for port 4:

Throughput Analysis Report
--------------------------
Block Throughput: 11.00 Cycles       Throughput Bottleneck: Backend
Loop Count:  22
Port Binding In Cycles Per Iteration:
--------------------------------------------------------------------------------------------------
|  Port  |   0   -  DV   |   1   |   2   -  D    |   3   -  D    |   4   |   5   |   6   |   7   |
--------------------------------------------------------------------------------------------------
| Cycles |  0.3     0.0  |  0.3  |  4.0     1.0  |  4.0     1.0  | 11.0  |  0.3  |  0.2  |  4.0  |
--------------------------------------------------------------------------------------------------

| Num Of   |                    Ports pressure in cycles                         |      |
|  Uops    |  0  - DV    |  1   |  2  -  D    |  3  -  D    |  4   |  5   |  6   |  7   |
-----------------------------------------------------------------------------------------
|   2^     |             |      |             |             | 1.0  |      |      | 1.0  | mov qword ptr [r14+0x40], r8
|   2^     |             |      |             | 1.0         | 1.0  |      |      |      | mov qword ptr [r14+0x48], r8
|   2^     |             |      |             |             | 1.0  |      |      | 1.0  | mov qword ptr [r14+0x50], r8
|   2^     |             |      | 1.0         |             | 1.0  |      |      |      | mov qword ptr [r14+0x58], r8
|   2^     |             |      |             | 1.0         | 1.0  |      |      |      | mov qword ptr [r14+0x60], r8
|   2^     |             |      |             |             | 1.0  |      |      | 1.0  | mov qword ptr [r14+0x68], r8
|   2^     |             |      | 1.0         |             | 1.0  |      |      |      | mov qword ptr [r14+0x70], r8
|   2^     |             |      |             | 1.0         | 1.0  |      |      |      | mov qword ptr [r14+0x78], r8
|   2^     |             |      |             |             | 1.0  |      |      | 1.0  | mov qword ptr [r14+0x80], r8
|   2^     |             |      | 1.0         |             | 1.0  |      |      |      | mov qword ptr [r14+0x88], r8
|   4      | 0.3         | 0.3  | 1.0     1.0 | 1.0     1.0 | 1.0  | 0.3  | 0.2  |      | 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
Loop Count:  22
Port Binding In Cycles Per Iteration:
--------------------------------------------------------------------------------------------------
|  Port  |   0   -  DV   |   1   |   2   -  D    |   3   -  D    |   4   |   5   |   6   |   7   |
--------------------------------------------------------------------------------------------------
| Cycles |  0.3     0.0  |  0.3  |  6.0     6.0  |  6.0     6.0  |  1.0  |  0.3  |  0.2  |  0.0  |
--------------------------------------------------------------------------------------------------

| Num Of   |                    Ports pressure in cycles                         |      |
|  Uops    |  0  - DV    |  1   |  2  -  D    |  3  -  D    |  4   |  5   |  6   |  7   |
-----------------------------------------------------------------------------------------
|   1^     |             |      | 1.0     1.0 |             |      |      |      |      | lddqu xmm0, xmmword ptr [r14+0x40]
|   1^     |             |      |             | 1.0     1.0 |      |      |      |      | lddqu xmm1, xmmword ptr [r14+0x40]
|   1^     |             |      | 1.0     1.0 |             |      |      |      |      | lddqu xmm2, xmmword ptr [r14+0x40]
|   1^     |             |      |             | 1.0     1.0 |      |      |      |      | lddqu xmm3, xmmword ptr [r14+0x40]
|   1^     |             |      | 1.0     1.0 |             |      |      |      |      | lddqu xmm4, xmmword ptr [r14+0x40]
|   1^     |             |      |             | 1.0     1.0 |      |      |      |      | lddqu xmm5, xmmword ptr [r14+0x40]
|   1^     |             |      | 1.0     1.0 |             |      |      |      |      | lddqu xmm6, xmmword ptr [r14+0x40]
|   1^     |             |      |             | 1.0     1.0 |      |      |      |      | lddqu xmm7, xmmword ptr [r14+0x40]
|   1^     |             |      | 1.0     1.0 |             |      |      |      |      | lddqu xmm8, xmmword ptr [r14+0x40]
|   1^     |             |      |             | 1.0     1.0 |      |      |      |      | lddqu xmm9, xmmword ptr [r14+0x40]
|   4      | 0.3         | 0.3  | 1.0     1.0 | 1.0     1.0 | 1.0  | 0.3  | 0.2  |      | 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, 6}:

Throughput Analysis Report
--------------------------
Block Throughput: 5.00 Cycles       Throughput Bottleneck: Dependency chains
Loop Count:  22
Port Binding In Cycles Per Iteration:
--------------------------------------------------------------------------------------------------
|  Port  |   0   -  DV   |   1   |   2   -  D    |   3   -  D    |   4   |   5   |   6   |   7   |
--------------------------------------------------------------------------------------------------
| Cycles |  4.3     0.0  |  4.3  |  1.0     1.0  |  1.0     1.0  |  1.0  |  4.3  |  4.2  |  0.0  |
--------------------------------------------------------------------------------------------------

| Num Of   |                    Ports pressure in cycles                         |      |
|  Uops    |  0  - DV    |  1   |  2  -  D    |  3  -  D    |  4   |  5   |  6   |  7   |
-----------------------------------------------------------------------------------------
|   1      | 0.3         | 0.3  |             |             |      | 0.3  | 0.2  |      | mov bh, 0x0
|   1      | 0.2         | 0.3  |             |             |      | 0.3  | 0.3  |      | mov ch, 0x0
|   1      | 0.3         | 0.2  |             |             |      | 0.3  | 0.3  |      | mov dh, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.2  | 0.3  |      | mov ah, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.3  | 0.2  |      | mov bh, 0x0
|   1      | 0.2         | 0.3  |             |             |      | 0.3  | 0.3  |      | mov ch, 0x0
|   1      | 0.3         | 0.2  |             |             |      | 0.3  | 0.3  |      | mov dh, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.2  | 0.3  |      | mov ah, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.3  | 0.2  |      | mov bh, 0x0
|   1      | 0.2         | 0.3  |             |             |      | 0.3  | 0.3  |      | mov ch, 0x0
|   1      | 0.3         | 0.2  |             |             |      | 0.3  | 0.3  |      | mov dh, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.2  | 0.3  |      | mov ah, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.3  | 0.2  |      | mov bh, 0x0
|   1      | 0.2         | 0.3  |             |             |      | 0.3  | 0.3  |      | mov ch, 0x0
|   1      | 0.3         | 0.2  |             |             |      | 0.3  | 0.3  |      | mov dh, 0x0
|   1      | 0.3         | 0.3  |             |             |      | 0.2  | 0.3  |      | mov ah, 0x0
|   4      | 0.3         | 0.3  | 1.0     1.0 | 1.0     1.0 | 1.0  | 0.3  | 0.2  |      | add byte ptr [r14+r13*1], 0x2
Total Num Of Uops: 20
⇨ One μop that can only use ports {0, 1, 5, 6}