forked from OSchip/llvm-project
fde8eb00e1
We can't leave undef vector element constants as-is, it is a miscompile, so we need to sanitize them. We have two vectors (C and ~C): * We can't replace undef with 0 in both of them * We can't replace undef with 0 in only one of them * We could replace undef with -1 in both of them * We could replace undef with -1 in only one(!) of them * We could replace undef with -1 in one and 0 in another one of them. Therefore, it seems best to go with the last option, since otherwise we'd loose knowledge that C and ~C have no common bits set, which seems more important than preserving partial undef knowledge. Fixes https://bugs.llvm.org/show_bug.cgi?id=45955 |
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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.