RSP

RSP is an acronym that may refer to different concepts in different domains. In computing, RSP most commonly denotes the 64-bit stack pointer register in the x86-64 architecture. The RSP register holds the address of the top of the program stack and is updated by stack operations such as push and pop. It plays a central role in function calling conventions, stack frame layout, and interrupt handling. In 32-bit mode, the corresponding register is ESP, while in 64-bit mode the register is RSP. Programmers interact with RSP indirectly via assembly or compiler-generated code, and its value is critical for correct program flow and memory access.

In other contexts, RSP can stand for a variety of terms, including organizational names, program titles, or technical protocols. Because it is an acronym with multiple uses, the exact meaning of RSP should be determined from the surrounding text or glossary in any given document.

If you encounter RSP in a specific field, consult domain-specific references to determine the intended definition. This article aims to identify the most common usage in computing while acknowledging other potential meanings.