forked from OSchip/llvm-project
4d20cc21c7
AtomicCmpSwapWithSuccess is legalised into an AtomicCmpSwap plus a comparison. This requires an extension of the value which, by default, is a zero-extension. When we later lower AtomicCmpSwap into a PseudoCmpXchg32 and then expanded in RISCVExpandPseudoInsts.cpp, the lr.w instruction does a sign-extension. This mismatch of extensions causes the comparison to fail when the compared value is negative. This change overrides TargetLowering::getExtendForAtomicOps for RISC-V so it does a sign-extension instead. Differential Revision: https://reviews.llvm.org/D58829 Patch by Ferran Pallarès Roca. llvm-svn: 355869 |
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README.txt
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.