字节对齐

TDS不支持字节对齐规则。

TDS does not support byte alignment rules .

当应用程序移植到不同平台时字节对齐（alignment）问题经常出现，稍有差错就有可能导致buserror等内存错误。

At the same time , byte alignment problems may arise when transplant application from one platform to another . An incaution often causes bus error and other memory error .

采用字节对齐的索引压缩技术，不但可以有效地减少索引占用的磁盘空间，而且可以加快检索时间，索引的空间和时间效率都得以提高。

The index efficiency of space and time is improved by these methods .

为进行字节对齐，十六进制数据的位数必须为偶数

Hex data must have an even number of digits in order to be byte aligned

这意味着字将是4字节对齐的，半字将是2字节对齐的，而字节则不需要对齐。

That means that words will be4-byte aligned , halfwords will be2-byte aligned , and bytes don 't have to be aligned at all .

在下一篇文章中我们将更详细地介绍这方面的内容，但是对于大部分DMA传输来说，都必须按照16字节边界对齐，并且大小应该是16字节的整数倍。

We will deal with this more in a later article , but for the most part DMA transfers must be aligned to a16-byte boundary and be sized as a multiple of16 bytes .

所有堆栈的值都必须是双字（8个字节）对齐的，整个帧应该是4字（16个字节）对齐的。

All stack values must be doubleword ( 8-byte ) aligned , and the whole frame should be quadword ( 16-byte ) aligned .

不管是传入的参数还是通过其他方式获得的地址，DMA的目标地址必须要与缓存线路（16字节）进行对齐。

Whether it 's an argument passed in or an address gotten some other way , the DMA targets must be aligned on cache lines ( 16 bytes ) .

优化的传输是128的整数倍，它们都在128字节边界上对齐。

Optimal transfers are multiples of128 bytes that are on128-byte boundaries .

在这个示例中，结构s以8个字节为单位进行对齐，s.var2变量同样也是如此。

In this example , the structure s is aligned to an8-byte boundary , and so is the s.var2 variable .

然而，对于2的任意次幂，这会确保不论您的初值是什么，所生成的值都是对多个字节的倍数而对齐的。

However , for any power of two , this will give you a guarantee that no matter what your starting value is , the resulting value will be aligned to a multiple of that many bytes .

现代的体系架构（Pentium及更新的体系架构）更喜欢将“longdouble”按照8字节或16字节进行对齐。

Modern architectures ( Pentium and newer ) would prefer " long double " to be aligned to an8-or16-byte boundary .

该方法采用设置特殊序列码作为定界符，设计一种类似帧同步的字节边界检测与字节边界对齐模块，检测数据包有效数据的起始点，实现定位误码比对。

In the comparison , a special sequence code is adopted as delimiter . A byte boundary measurement and alignment similar to the frame synchronizing is designed to check the effective data beginning in a burst and accomplish error bit comparison .

记住，传输16字节或更多字节的DMA在SPE和PPE上必须是16字节的整数倍，并按照16字节边界进行对齐。

Remember that DMA transfers of16 bytes or more must be in16-byte multiples and aligned to16-byte boundaries on both the SPE and the PPE .