mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-02-01 05:01:59 +01:00
0e6a699715
Currently, we have some confusion in the codebase regarding the meaning of LocationSize::unknown(): Some parts (including most of BasicAA) assume that LocationSize::unknown() only allows accesses after the base pointer. Some parts (various callers of AA) assume that LocationSize::unknown() allows accesses both before and after the base pointer (but within the underlying object). This patch splits up LocationSize::unknown() into LocationSize::afterPointer() and LocationSize::beforeOrAfterPointer() to make this completely unambiguous. I tried my best to determine which one is appropriate for all the existing uses. The test changes in cs-cs.ll in particular illustrate a previously clearly incorrect AA result: We were effectively assuming that argmemonly functions were only allowed to access their arguments after the passed pointer, but not before it. I'm pretty sure that this was not intentional, and it's certainly not specified by LangRef that way. Differential Revision: https://reviews.llvm.org/D91649
The LLVM Compiler Infrastructure ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.