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RET

Pops the top qword from the stack into the instruction pointer (RIP), effectively returning from a procedure.

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

In 64-bit mode, the instruction pops a qword from the stack. In compatibility mode, the behavior depends on the operand size override; if the operand size is 32-bit, it pops a dword and zero-extends the upper 32 bits of RIP.

The stack pointer (RSP) is incremented by 8 bytes (or 4 bytes in compatibility mode with a 32-bit operand size) after the return address is popped. If the stack pointer is not properly aligned or if the value popped from the stack is non-canonical, a general-protection exception (#GP) SHALL occur.

When using RET n, the instruction pops the return address and then adds n bytes to the stack pointer (RSP). This is used to clean up arguments passed on the stack (callee cleanup). The immediate n MUST be a byte.