SFENCE - 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 | 3.7 0.0 | 3.6 0.0 | 11.0 | 0.3 | 0.2 | 3.7 |
--------------------------------------------------------------------------------------------------
| 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^ | 0.3 | 0.3 | 0.4 | 0.3 | 1.0 | 0.3 | 0.2 | 0.3 | sfence
Total Num Of Uops: 22
⇨ One μop that can only use port '4'
With blocking instructions for ports {'2', '3', '7'}:
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 | 3.7 0.0 | 3.6 0.0 | 11.0 | 0.3 | 0.2 | 3.7 |
--------------------------------------------------------------------------------------------------
| 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^ | 0.3 | 0.3 | 0.4 | 0.3 | 1.0 | 0.3 | 0.2 | 0.3 | sfence
Total Num Of Uops: 22
⇨ One μop that can only use ports {'2', '3', '7'}
With blocking instructions for ports {'0', '1', '5', '6'}:
Throughput Analysis Report
--------------------------
Block Throughput: 3.00 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 | 2.8 0.0 | 2.7 | 0.3 0.0 | 0.4 0.0 | 1.0 | 2.7 | 2.7 | 0.3 |
--------------------------------------------------------------------------------------------------
| Num Of | Ports pressure in cycles | |
| Uops | 0 - DV | 1 | 2 - D | 3 - D | 4 | 5 | 6 | 7 |
-----------------------------------------------------------------------------------------
| 1 | 0.3 | 0.2 | | | | 0.3 | 0.3 | | mov bh, 0x0
| 1 | 0.3 | 0.3 | | | | 0.2 | 0.3 | | mov ch, 0x0
| 1 | 0.3 | 0.3 | | | | 0.3 | 0.2 | | mov dh, 0x0
| 1 | 0.2 | 0.3 | | | | 0.3 | 0.3 | | mov ah, 0x0
| 1 | 0.3 | 0.2 | | | | 0.3 | 0.3 | | mov bh, 0x0
| 1 | 0.3 | 0.3 | | | | 0.2 | 0.3 | | mov ch, 0x0
| 1 | 0.3 | 0.3 | | | | 0.3 | 0.2 | | mov dh, 0x0
| 1 | 0.2 | 0.3 | | | | 0.3 | 0.3 | | mov ah, 0x0
| 1 | 0.3 | 0.2 | | | | 0.3 | 0.3 | | mov bh, 0x0
| 1 | 0.3 | 0.3 | | | | 0.2 | 0.3 | | mov ch, 0x0
| 2^ | 0.3 | 0.3 | 0.3 | 0.4 | 1.0 | 0.3 | 0.2 | 0.3 | sfence
Total Num Of Uops: 12
⇨ One μop that can only use ports {'0', '1', '5', '6'}