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For x86, the halt instruction is defined as a terminator instruction. When building the CFG, the instruction sequence following the hlt instruction is treated as an independent MBB. Since there is no jump information, the predecessor of this MBB cannot be identified, and it is considered an unreachable MBB that will be removed. Using this fix, the instruction sequences before and after hlt are refused to be placed in different blocks.
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.
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