func Swap(a, b int) (int, int)

+----------+
|          |
|  stack   |
|  cRED    |              call frame
+----------+             +-----------+ <-=-arg+argsize(FP)
|  stack   | <--------=- | argsize   | <------------------------+argsize
|          |             | cPNK      |                          :
|call frame|             +-----------+ <-=-arg+0(FP)            |
|    |     |             | cAAA      |                          |
|    |     |             +-----------+ <-=-tmp-0(SP)            |
|cRED|     | <--------=- | framesize | <---------+framesize     |
|    v     |             | cRED      |           :              |
+----------+ <-=-0(SP)   +-----------+ <-=-0(SP) |              |
|  cAAA    |                                     |              |
|  unused  |                                     |              |
|          |                                     |              |
+----------+                                     |              |
|   cGRE   |                                     |              |
|   heap   |                                     |              |
|          |             +------+------------+------------+---+------+
+----------+             |      |            |            |   |      |
|   cBLU   |    +-----=- | TEXT | ·Swap(SB), | $framesize | - | 32   |
|   data   |    |        | cYEL | cYEL       | cRED       |   | cRED |
+----------+    |        +------+------------+------------+---+------+
|   cYEL   | <--+TEXT                   |
|   text   |                            :
+----------+ <--------------------------+SB