Fangrui Song ca5b3a0f51 [MC] Remove SetUsed on isUndefined and getFragment
Due to the known limitations of .set reassignment (see
https://sourceware.org/PR288), we use diagnostics to reject patterns
that could lead to errors (ae7ac010594f693fdf7b3ab879e196428d961e75 2009-06)).

This code gets refined multiple times, see:

* 9b4a824217f1fe23f83045afe7521acb791bc2d0 (2010-05) `IsUsedInExpr`
* 46c79ef1132607aead144dfda0f26aa8b065214f (2010-11) renamed `IsUsedInExpr` to `IsUsed`

The related `SetUsed` bit seems unnecessary nowadays.
2025-04-13 00:53:29 -07:00
2025-04-12 23:35:49 -07:00
2025-01-28 19:48:43 -08:00

The LLVM Compiler Infrastructure

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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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Consult the Getting Started with LLVM page for information on building and running LLVM.

For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

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Description
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
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