absolute addressing

简明释义

绝对编址;

英英释义

例句

1.In assembly language programming, using absolute addressing 绝对寻址 allows the programmer to specify the exact memory location of a variable.

在汇编语言编程中，使用绝对寻址 absolute addressing 允许程序员指定变量的确切内存位置。

2.When writing low-level code, you might prefer absolute addressing 绝对寻址 for direct memory manipulation.

在编写低级代码时，你可能会选择绝对寻址 absolute addressing 以便直接操作内存。

3.The difference between absolute addressing 绝对寻址 and relative addressing is crucial in understanding how programs access data.

理解程序如何访问数据时，绝对寻址 absolute addressing 和相对寻址之间的区别至关重要。

4.In debugging, knowing whether a function uses absolute addressing 绝对寻址 can help pinpoint memory-related errors.

在调试中，知道一个函数是否使用绝对寻址 absolute addressing 可以帮助定位与内存相关的错误。

5.The CPU can execute instructions faster when absolute addressing 绝对寻址 is used because it doesn't require additional calculations.

当使用绝对寻址 absolute addressing 时，CPU可以更快地执行指令，因为它不需要额外的计算。

作文

In the realm of computer science, understanding various addressing modes is crucial for efficient programming and memory management. One such mode is absolute addressing, which plays a significant role in how programs access data stored in memory. To grasp the concept of absolute addressing, we must first recognize its definition: 绝对寻址 refers to a method where the address of the data is specified explicitly in the instruction itself. This means that the instruction contains the exact location in memory where the data can be found, rather than relying on any form of relative positioning or indirect addressing.The primary advantage of absolute addressing is its simplicity and directness. When a program uses this addressing mode, it can quickly locate the data it needs without additional calculations or references. For example, if a program needs to access a variable stored at memory address 0x0040, the instruction will directly refer to that address. This leads to faster execution times, as the CPU can retrieve the required data without navigating through complex addressing schemes.However, absolute addressing also has its limitations. One significant drawback is its lack of flexibility. Since the address is hard-coded into the instruction, any changes to the memory layout or the relocation of data would necessitate modifications to the program code. This can make programs less portable and harder to maintain, especially in larger applications where data may frequently change locations in memory.In contrast to absolute addressing, other addressing modes such as relative addressing or indexed addressing offer more flexibility. Relative addressing allows the program to specify an address in relation to a certain point, often the current instruction pointer, making the code easier to relocate or adapt to different memory layouts. Indexed addressing, on the other hand, uses a base address and an index value to calculate the final address, which can be particularly useful in handling arrays and data structures.Despite its limitations, absolute addressing is still used in various situations, particularly in low-level programming and embedded systems where performance is critical and the memory layout is known and fixed. In such cases, the benefits of rapid access to data can outweigh the downsides of rigidity. Furthermore, understanding absolute addressing is essential for programmers working with assembly language or interfacing directly with hardware, as it provides insights into how the CPU interacts with memory.In conclusion, absolute addressing is a fundamental concept in computer architecture that facilitates direct access to memory locations. While it offers efficiency and simplicity, it also poses challenges in terms of flexibility and maintainability. As technology evolves and programming paradigms shift, the relevance of absolute addressing may vary, but its foundational principles remain integral to understanding how computers operate at a low level. By mastering this concept, programmers can enhance their skills and optimize their code for better performance and reliability.

在计算机科学领域，理解各种寻址模式对于高效编程和内存管理至关重要。其中一种模式是绝对寻址，它在程序如何访问存储在内存中的数据方面起着重要作用。要理解绝对寻址的概念，我们首先必须认识到它的定义：绝对寻址指的是一种方法，其中数据的地址在指令中明确指定。这意味着指令包含了数据可以在内存中找到的确切位置，而不是依赖于任何形式的相对定位或间接寻址。绝对寻址的主要优点是简单直接。当程序使用这种寻址模式时，它可以快速定位所需的数据，而无需额外的计算或引用。例如，如果程序需要访问存储在内存地址0x0040的变量，指令将直接引用该地址。这导致执行时间更快，因为CPU可以在没有复杂寻址方案的情况下检索所需的数据。然而，绝对寻址也有其局限性。一个显著的缺点是缺乏灵活性。由于地址是硬编码到指令中，因此对内存布局或数据重新定位的任何更改都需要对程序代码进行修改。这可能使得程序变得不那么可移植，并且在大型应用程序中更难维护，因为数据的位置可能会频繁变动。与绝对寻址相比，其他寻址模式如相对寻址或索引寻址提供了更多的灵活性。相对寻址允许程序以某个点为参考（通常是当前指令指针）来指定地址，使得代码更容易重新定位或适应不同的内存布局。而索引寻址则使用基地址和索引值来计算最终地址，这在处理数组和数据结构时尤其有用。尽管存在局限性，绝对寻址仍然在各种情况下被使用，特别是在低级编程和嵌入式系统中，在这些情况下性能至关重要且内存布局是已知且固定的。在这种情况下，快速访问数据的好处可能超过了刚性的缺点。此外，理解绝对寻址对于从事汇编语言编程或直接与硬件接口的程序员来说至关重要，因为它提供了CPU如何与内存交互的深入见解。总之，绝对寻址是计算机体系结构中的一个基本概念，它促进了对内存位置的直接访问。虽然它提供了效率和简单性，但在灵活性和可维护性方面也面临挑战。随着技术的发展和编程范式的变化，绝对寻址的相关性可能会有所不同，但其基础原则仍然是理解计算机如何在低级别操作的关键。通过掌握这一概念，程序员可以提升他们的技能，优化代码以实现更好的性能和可靠性。