s1 (RISC-V)

risc-v

Definition

s1 ( RISC-V)

s1 is the RISC-V integer register x9. It is a saved register and must preserve its value across function calls according to the RISC-V calling convention.

Saved registers like s1 are used to hold values that must survive across function calls, allowing a called function to use the register without corrupting data that the caller depends upon.