ad2905e52c
Alternative instructions in the Linux kernel may modify control flow in a function. As such, it is unsafe to optimize functions with alternative instructions until we properly support CFG alternatives. Previously, we marked functions with alt instructions before the emission, but that could be too late if we remove or replace instructions with alternatives. We could have marked functions as non-simple immediately after reading .altinstructions, but it's nice to be able to view functions after CFG is built. Thus assign the non-simple status after building CFG.
The LLVM Compiler Infrastructure
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called "LLVM". This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
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