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伙计们，我确信这是一个愚蠢的问题，但是我认为有一种方法可以使编译器预做数学与#define语句相关联。例如：#define x 10#define y(adder)(x+adder)C code:dummy=y(50)编译器将预添加x(10)+50。所以MCU执行的实际代码是dummy=60，而不是dummy=10+50我希望这是有意义的。
以上来自于百度翻译 以下为原文 Guys I am sure this is a silly question, but I thought there was a way to make the compiler pre-do math associated with #define statements. for instance: #define x 10 #define y(adder) (x+adder) C code: dummy = y(50) Where the compiler would pre-add the x(10) + 50. So the actual code executed by the MCU is dummy = 60 instead of dummy = 10 + 50 I hope that makes sense. Thanks in advance, Dave P 
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我相信多年前，当我真正读到文学作品时，它说它会，但我很好奇，如果我必须为此设置任何选项。我想我可以只对它进行编码，然后看看拆卸列表。但是如果它不做我所期望的，我应该做什么设置来实现这一目标呢？
以上来自于百度翻译 以下为原文 I believe years ago when I actually read the literature that it said it would but I was curious if I have to set any options to do so. I guess I can just code it, then look at the disassembly listing. But it if does not do what I expect, what settings should I do to make that happen? |
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也许我只是过度的资源意识，但我的问题背后的想法是尽可能地优化。这个例子“哑＝50 +X”只是一个基本的例子。在现实世界中，我想计算一组索引，如果有的话，这些索引可能变化甚微。它将在程序时间内改变，而不是运行时。如果它改变了，我希望它在引用的地方动态地改变。为了限制开销和浪费的MCU内存，最好让编译器进行预计算，这样CPU就不必再进行其他添加，或者在运行时预计算一次索引并将其存储在RAM中的情况下使用额外的ram。
以上来自于百度翻译 以下为原文 Maybe I am just over-resource conscious, but the idea behind my questions is to optimize as much as possible. The example "dummy = 50 + x" was just a basic example. In the real world case I want to calculate a set of indexes that may change very little if ever. It would be changed during program time, not run-time. If it does change I want it to change dynamically everywhere they are referenced. To limit both overhead and wasted MCU memory it would be nice to have the compiler pre-calculate so that the CPU doesn't have to do yet another add, or use extra ram in the case where this index would be pre-calculated once at run time, and stored in RAM. |
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