valid_alu_i
bool valid_alu_i(u8 op, s32 imm);
if (!valid_alu_i(BPF_OP(code), imm)) {
if (!valid_alu_i(BPF_OP(code), imm)) {
if (!valid_alu_i(BPF_OP(code), imm)) {
if (!valid_alu_i(BPF_OP(code), imm)) {