static void emit_alu_r32()

in net/bpf_jit_comp32.c [511:562]

• 50 lines of code
• 14 McCabe index (conditional complexity)

static void emit_alu_r32(const s8 *dst, const s8 *src,
			 struct rv_jit_context *ctx, const u8 op)
{
	const s8 *tmp1 = bpf2rv32[TMP_REG_1];
	const s8 *tmp2 = bpf2rv32[TMP_REG_2];
	const s8 *rd = bpf_get_reg32(dst, tmp1, ctx);
	const s8 *rs = bpf_get_reg32(src, tmp2, ctx);

	switch (op) {
	case BPF_MOV:
		emit(rv_addi(lo(rd), lo(rs), 0), ctx);
		break;
	case BPF_ADD:
		emit(rv_add(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_SUB:
		emit(rv_sub(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_AND:
		emit(rv_and(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_OR:
		emit(rv_or(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_XOR:
		emit(rv_xor(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_MUL:
		emit(rv_mul(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_DIV:
		emit(rv_divu(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_MOD:
		emit(rv_remu(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_LSH:
		emit(rv_sll(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_RSH:
		emit(rv_srl(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_ARSH:
		emit(rv_sra(lo(rd), lo(rd), lo(rs)), ctx);
		break;
	case BPF_NEG:
		emit(rv_sub(lo(rd), RV_REG_ZERO, lo(rd)), ctx);
		break;
	}

	bpf_put_reg32(dst, rd, ctx);
}