Transfers control from a procedure back to the instruction address saved on the stack.
“n bytes” is an optional number of bytes to release.
Far returns pop the IP followed by the CS, while near returns pop only the IP register.
Usage:
RET nBytes ; RETF nBytes ; RETN nBytes ;
Modifies flags:
none
| Clocks | Size | |||||
|---|---|---|---|---|---|---|
| Operands | 808x | 286 | 386 | 486 | Bytes | |
| retn | 16/20 | 11+m | 10+m | 5 | 1 | |
| retn immed | 20/24 | 11+m | 10+m | 5 | 3 | |
| retf | 26/34 | 15+m | 18+m | 13 | 1 | |
| retf (PM, same priv.) | - | - | 32+m | 18 | 1 | |
| retf (PM, lesser priv.) | - | - | 68 | 33 | 1 | |
| retf immed | 25/33 | 15+m | 18+m | 14 | 3 | |
| retf immed (PM, same priv.) | - | - | 32+m | 17 | 1 | |
| retf immed (PM, lesser priv.) | - | - | 68 | 33 | 1 | |