是专门用来编译1比1与位操作汇编指令的一个跨平台的方式有C函数和宏？ [英] Are there C functions or macros specifically designed to compile 1 to 1 with assembly instructions for bit manipulations in a cross-platform manner?

问题描述

我已经得到了包括仿真（如果你看看我的历史后，你会看到多远我来！）一个项目，我希望做伪二进制翻译使用C和与打优化和/或编译器使用C code，它编译我的switch语句内容到一个单一的汇编指令，主要用于非常标准的指令，例如 MOV S，添加， SR 等简单的位操作和算术指令。我希望能在同一时间为ARM和x86-64做到这一点，写少它在这两个组件成为可能。

I've got a project involving emulation (If you look at my post history, you'll see how far I've come!) and I'm looking to do pseudo-binary-translation using C and playing with the optimizers and/or compilers to use C code that compiles my switch statement contents to a single assembly instruction, primarily for very standard instructions such as movs, add, SR and other simple bit manipulations and arithmetic instructions. I'm hoping to do this for ARM and x86-64 at the same time, writing as little of it in both assemblies as possible.

如果我所描述的东西不存在，那么我想知道是否有某种汇编语言，我可以用它来写我的code，然后编译组装成的x86-64和ARM的。

If the thing I'm describing doesn't exist, then I wonder if there's some sort of "assembly language" that I can use to write my code and then compile that assembly into x86-64 and ARM.

推荐答案

要清楚地回答这一部分：

To clearly answer this part:

...然后我不知道是否有某种汇编语言的，我可以
  用它来写我的code，然后编译成汇编和X86-64
  ARM。

... then I wonder if there's some sort of "assembly language" that I can use to write my code and then compile that assembly into x86-64 and ARM.

这正是 LLVM IR 是目标定位。

该LLVM重新presentation目标是重量轻，低层次的，而
  作为前pressive，打字，并在同一时间可扩展的。它的目的是
  是各种各样的万能的IR，由是在足够低的水平
  高层次的想法，可以清晰地映射到它（类似于如何
  微处理器是万能IR的，这让很多源语言
  被映射到它们）。

The LLVM representation aims to be light-weight and low-level while being expressive, typed, and extensible at the same time. It aims to be a "universal IR" of sorts, by being at a low enough level that high-level ideas may be cleanly mapped to it (similar to how microprocessors are "universal IR’s", allowing many source languages to be mapped to them).

有关例如：

您可以重新present这个C函数

You can represent this C function

int mul_add(int x, int y, int z) {
  return x * y + z;
}

本LLVM IR

with this LLVM IR

define i32 @mul_add(i32 %x, i32 %y, i32 %z) {
entry:
  %tmp = mul i32 %x, %y
  %tmp2 = add i32 %tmp, %z
  ret i32 %tmp2
}

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