Function enc_cmp_test

src/codec.cpp:1853–1880

CMP / TEST: share the bin-op encoding but only write flag context.

    // CMP / TEST: share the bin-op encoding but only write flag context.
    static void enc_cmp_test(BytecodeBuilder& o, const IRInsn& i, const VMConfig& v, const Codec* self) {
        o.u8(v.opcode_for(self->family()));
        if (std::holds_alternative<VirReg>(i.ops[0])) {
            o.u8(0);
            enc_slot(o, v, get_op<VirReg>(i, 0));
        }
        else {
            o.u8(1);
            const auto& im = get_op<Imm>(i, 0);
            enc_imm_n(o, im.value, 8);
        }

        if (std::holds_alternative<VirReg>(i.ops[1])) {
            o.u8(0);
            enc_slot(o, v, get_op<VirReg>(i, 1));
        }
        else if (std::holds_alternative<Imm>(i.ops[1])) {
            o.u8(1);
            const auto& im = get_op<Imm>(i, 1);
            enc_imm_n(o, im.value, 8);
        }
        else {
            o.u8(2);
            enc_mem(o, v, get_op<Mem>(i, 1));
        }

        o.u8(static_cast<std::uint8_t>(width_bytes(i.width)));
    }

    static void emit_cmp_test_handler(X64Emitter& e, const VMConfig& vm, bool is_test) {
        const auto& r = vm.dispatcher_regs();