mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-10 02:36:06 +00:00
2286ae542c
Because the PowerPC vmrgh* and vmrgl* instructions have a built-in big-endian bias, it is necessary to swap their inputs in little-endian mode when using them to implement a vector shuffle. This was previously missed in the vector LE implementation. There was already logic to distinguish between unary and "normal" vmrg* vector shuffles, so this patch extends that logic to use a third option: "swapped" vmrg* vector shuffles that are used for little endian in place of the "normal" ones. I've updated the vec-shuffle-le.ll test to check for the expected register ordering on the generated instructions. This bug was discovered when testing the LE and ELFv2 patches for safety if they were backported to 3.4. A different vectorization decision was made in 3.4 than on mainline trunk, and that exposed the problem. I've verified this fix takes care of that issue. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213915 91177308-0d34-0410-b5e6-96231b3b80d8
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for the Low Level Virtual Machine, 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're writing a package for LLVM, see docs/Packaging.rst for our suggestions.