in net/bpf_jit.h [832:843]
static inline void emit_addi(u8 rd, u8 rs, s32 imm, struct rv_jit_context *ctx)
{
if (rvc_enabled() && rd == RV_REG_SP && rd == rs && is_10b_int(imm) && imm && !(imm & 0xf))
emitc(rvc_addi16sp(imm), ctx);
else if (rvc_enabled() && is_creg(rd) && rs == RV_REG_SP && is_10b_uint(imm) &&
!(imm & 0x3) && imm)
emitc(rvc_addi4spn(rd, imm), ctx);
else if (rvc_enabled() && rd && rd == rs && imm && is_6b_int(imm))
emitc(rvc_addi(rd, imm), ctx);
else
emit(rv_addi(rd, rs, imm), ctx);
}