好的，各位观众，欢迎来到今天的“编译器内部大冒险”！今天咱们不玩虚的，直接钻进编译器的心脏，看看它到底是怎么把我们辛辛苦苦写的 C++ 代码，变成机器能懂的二进制指令的。别害怕，虽然听起来很高深，但其实也挺有趣的，前提是咱们得找对路。
今天的主题是“C++ 编译器内部表示（IR）分析：LLVM IR / GCC RTL 的阅读与优化”。简单来说，就是研究编译器在翻译 C++ 代码的过程中，产生的中间语言（IR），以及如何利用这些中间语言来提升程序的性能。
第一站：为什么要有中间语言？
想象一下，你要把中文小说翻译成法语，但你只会英语。怎么办？找个懂中文和英语的翻译，先把中文翻译成英语，然后再找个懂英语和法语的翻译，把英语翻译成法语。
编译器也是一样的道理。C++ 是一种高级语言，直接翻译成机器码太复杂了。所以编译器会先把它翻译成一种中间语言，这种语言比 C++ 更接近机器码，但又不像机器码那样难以理解。不同的编译器使用不同的中间语言。常见的有 LLVM IR 和 GCC RTL。
这样做的好处是：
- 解耦： 前端（C++ 编译器）只需要关心如何把 C++ 翻译成 IR，后端（代码生成器）只需要关心如何把 IR 翻译成机器码。这样，前端和后端可以独立开发，互不影响。
- 优化： 可以在 IR 上进行各种优化，比如死代码消除、循环展开等等。这些优化可以提高程序的性能。
- 可移植性： 同样的 IR 可以被翻译成不同的机器码，从而实现跨平台编译。
第二站：初探 LLVM IR
LLVM IR (Intermediate Representation) 是 LLVM 项目中使用的一种中间语言。它是一种静态单赋值（SSA）的 IR，这意味着每个变量只会被赋值一次。
咱们来看一个简单的 C++ 例子：
int add(int a, int b) {
return a + b;
}用 Clang 编译成 LLVM IR：
clang -S -emit-llvm add.cpp -o add.ll打开 add.ll 文件，你可能会看到类似这样的内容：
; ModuleID = 'add.cpp'
source_filename = "add.cpp"
target datalayout = "e-m:e-p270:32:32-p271:32:32-i64:64-i128:128-f80:128-fp128:128-n64:64-S128"
target triple = "x86_64-pc-linux-gnu"
; Function Attrs: noinline nounwind optnone uwtable
define dso_local i32 @_Z3addii(i32 %0, i32 %1) #0 {
%3 = alloca i32, align 4
%4 = alloca i32, align 4
store i32 %0, i32* %3, align 4
store i32 %1, i32* %4, align 4
%5 = load i32, i32* %3, align 4
%6 = load i32, i32* %4, align 4
%7 = add nsw i32 %5, %6
ret i32 %7
}
attributes #0 = { noinline nounwind optnone uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
!llvm.module.flags = !{!0, !1, !2}
!llvm.ident = !{!3}
!0 = !{i32 2, !"SDK Version", [8 x i8] c"12.3.10"}
!1 = !{i32 2, !"Dwarf Version", i32 4}
!2 = !{i32 1, !"Debug Info Version", i32 7}
!3 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git 79c1620c6c9920c9a2e52b6589e7a074535f7e9f)"}别被吓到，咱们慢慢来。
define dso_local i32 @_Z3addii(i32 %0, i32 %1) #0: 定义了一个名为_Z3addii的函数，它接受两个i32(32 位整数) 类型的参数%0和%1，并返回一个i32类型的值。_Z3addii是 C++ 函数add的名字修饰（name mangling）后的结果。#0是一个属性组的引用，包含了函数的各种属性。%3 = alloca i32, align 4: 在栈上分配一块 4 字节的内存，用于存储一个i32类型的值。%3是一个局部变量，指向这块内存的地址。alloca指令用于在栈上分配内存。- *`store i32 %0, i32 %3, align 4
**: 将%0的值存储到%3指向的内存中。store` 指令用于将一个值存储到内存中。 - *`%5 = load i32, i32 %3, align 4
**: 从%3指向的内存中加载一个i32类型的值，并将其存储到%5中。load` 指令用于从内存中加载一个值。 %7 = add nsw i32 %5, %6: 将%5和%6的值相加，并将结果存储到%7中。add指令用于执行加法运算。nsw(no signed wrap) 标志表示如果加法运算导致有符号溢出，则结果是未定义的。ret i32 %7: 返回%7的值。ret指令用于从函数返回。
LLVM IR 的关键概念：
| 概念 | 解释 |
|---|---|
| 指令 | 执行具体操作的代码，比如 add, load, store, ret。 |
| 基本块 | 一系列指令的序列，只有一个入口和一个出口。 |
| 函数 | 一系列的指令和基本块的集合，定义了一个可调用的代码单元。 |
| 模块 | 包含所有代码的顶层结构，可以包含多个函数、全局变量等等。 |
| 变量 | 用 % 开头的标识符，代表寄存器或栈上的内存位置。LLVM IR 是 SSA 形式，每个变量只被赋值一次。 |
| 类型 | i32 (32位整数), i8* (指向 8 位整数的指针), float (浮点数) 等等。 |
第三站：GCC RTL
RTL (Register Transfer Language) 是 GCC (GNU Compiler Collection) 使用的一种中间语言。它比 LLVM IR 更接近机器码，更底层。RTL 主要描述了数据如何在寄存器之间传输，以及如何执行算术和逻辑运算。
同样的 C++ 代码：
int add(int a, int b) {
return a + b;
}用 GCC 编译成 RTL：
gcc -O1 -fverbose-asm -fdump-rtl-expand add.cpp这会生成一个名为 add.cpp.15.expand 的文件，其中包含了 RTL 代码。内容会很长，节选关键部分：
;; Function add (add, funcdef_no 0, decl_uid 106)
;; 3037 insns (difference between insn numbers is constant: 10)
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