zero (RISC-V)

risc-v

Definition

zero ( RISC-V)

zero is the RISC-V integer register x0, which is hard-wired to the constant value . It is a read-only register; any attempt to write to zero is ignored by hardware.

The register serves two primary purposes: providing a constant zero for computational operations and enabling the implementation of the mv pseudoinstruction by allowing reads of the value . All integer arithmetic operations that require a zero operand read from zero rather than requiring an explicit immediate.