GNU 汇编程序（Arm64）。宏参数引用中的括号

Question

我试图在 GNU 汇编程序中查找宏参数的任何信息括号语法。例如。我有以下代码：

    .macro      do_block, enc, in, rounds, rk, rkp, i
    eor     \in\().16b, \in\().16b, v15.16b
    ...

（取自here）

\in\().16b 中的括号是什么意思？在哪里可以找到此语法的文档？

Answer 1

好的，我找到了答案。这是转义宏参数名称的特殊语法。

来自documentation：

Note that since each of the macargs can be an identifier exactly as any other one permitted by the target architecture, there may be occasional problems if the target hand-crafts special meanings to certain characters when they occur in a special position. For example:

...

problems might occur with the period character (‘.’) which is often allowed inside opcode names (and hence identifier names). So for example constructing a macro to build an opcode from a base name and a length specifier like this:
.macro opcode base length
\base.\length
.endm
and invoking it as ‘opcode store l’ will not create a ‘store.l’ instruction but instead > generate some kind of error as the assembler tries to interpret the text \base.\length.

The string \() can be used to separate the end of a macro argument from the following text. eg:
    .macro opcode base length
    \base\().\length
    .endm

GNU 汇编程序（Arm64）。宏参数引用中的括号

GNU Assembler (Arm64). Parentheses in macro arguments references

gnu-assembler

arm64