XCHG (R64, R64) - Throughput and Uops (IACA 2.3)

With different registers for different operands

With 1 independent instruction

Throughput Analysis Report
--------------------------
Block Throughput: 0.95 Cycles       Throughput Bottleneck: FrontEnd

Port Binding In Cycles Per Iteration:
---------------------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |  6   |  7   |
---------------------------------------------------------------------------------------
| Cycles | 0.2    0.0  | 0.2  | 0.0    0.0  | 0.0    0.0  | 0.0  | 0.2  | 0.2  | 0.0  |
---------------------------------------------------------------------------------------


| Num Of |                    Ports pressure in cycles                     |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |  6  |  7  |    |
---------------------------------------------------------------------------------
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r8, r9
Total Num Of Uops: 1

With 6 independent instructions

Throughput Analysis Report
--------------------------
Block Throughput: 1.50 Cycles       Throughput Bottleneck: FrontEnd

Port Binding In Cycles Per Iteration:
---------------------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |  6   |  7   |
---------------------------------------------------------------------------------------
| Cycles | 1.5    0.0  | 1.5  | 0.0    0.0  | 0.0    0.0  | 0.0  | 1.5  | 1.5  | 0.0  |
---------------------------------------------------------------------------------------


| Num Of |                    Ports pressure in cycles                     |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |  6  |  7  |    |
---------------------------------------------------------------------------------
|   1    | 0.5       |     |           |           |     | 0.5 |     |     | CP | xchg r8, r9
|   1    |           | 0.5 |           |           |     |     | 0.5 |     | CP | xchg r10, r11
|   1    | 0.5       |     |           |           |     | 0.5 |     |     | CP | xchg r12, r13
|   1    |           | 0.5 |           |           |     |     | 0.5 |     | CP | xchg r14, rbx
|   1    | 0.5       |     |           |           |     | 0.5 |     |     | CP | xchg rcx, rdx
|   1    |           | 0.5 |           |           |     |     | 0.5 |     | CP | xchg rdi, rsi
Total Num Of Uops: 6

With the same register for for different operands

With 1 independent instruction

Throughput Analysis Report
--------------------------
Block Throughput: 0.95 Cycles       Throughput Bottleneck: FrontEnd

Port Binding In Cycles Per Iteration:
---------------------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |  6   |  7   |
---------------------------------------------------------------------------------------
| Cycles | 0.2    0.0  | 0.2  | 0.0    0.0  | 0.0    0.0  | 0.0  | 0.2  | 0.2  | 0.0  |
---------------------------------------------------------------------------------------


| Num Of |                    Ports pressure in cycles                     |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |  6  |  7  |    |
---------------------------------------------------------------------------------
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r8, r8
Total Num Of Uops: 1

With 13 independent instructions

Throughput Analysis Report
--------------------------
Block Throughput: 3.25 Cycles       Throughput Bottleneck: FrontEnd

Port Binding In Cycles Per Iteration:
---------------------------------------------------------------------------------------
|  Port  |  0   -  DV  |  1   |  2   -  D   |  3   -  D   |  4   |  5   |  6   |  7   |
---------------------------------------------------------------------------------------
| Cycles | 3.2    0.0  | 3.2  | 0.0    0.0  | 0.0    0.0  | 0.0  | 3.2  | 3.2  | 0.0  |
---------------------------------------------------------------------------------------


| Num Of |                    Ports pressure in cycles                     |    |
|  Uops  |  0  - DV  |  1  |  2  -  D  |  3  -  D  |  4  |  5  |  6  |  7  |    |
---------------------------------------------------------------------------------
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r8, r8
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r9, r9
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r10, r10
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r11, r11
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r12, r12
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r13, r13
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg r14, r14
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg rbx, rbx
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg rcx, rcx
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg rdx, rdx
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg rdi, rdi
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg rsi, rsi
|   1    | 0.2       | 0.2 |           |           |     | 0.2 | 0.2 |     | CP | xchg rbp, rbp
Total Num Of Uops: 13