You are already familiar with processing instructions because most XML documents start with the XML declaration, which is itself a special processing instruction.
您已经熟悉了处理指令，因为大多数XML文档都是以XML声明开始，该声明本身就是特殊的处理指令。
2
Also, you can use.align 3 to force a given instruction to start in a new fetch group (it will be padded with appropriate no-ops to align it properly).
An executable unit begins at the start of every basic block and at any instruction that corresponds to a line of source code that is different than the previous instruction.