lui

The RISC-V instruction that puts a number into the upper part of a register, ready for addi to fill in the low 12 bits.

lui rd, imm20 writes imm20 << 12, sign-extended to 64 bits on RV64, to rd; lui followed by addi builds any 32-bit signed constant (the li pseudo-instruction expands to such sequences).

Examples

lui a0, 0x12345 sets a0 to 0x12345000; addi a0, a0, 0x678 then gives 0x12345678.