a3d182bfe3
The i386 psABI specifies that `__float128` has 16 byte alignment and must be passed on the stack; however, LLVM currently stores it in a stack slot that has an offset of 4. Add a custom lowering to correct this alignment to 16-byte. i386 does not specify an `__int128`, but it seems reasonable to keep the same behavior as `__float128` so this is changed as well. There also isn't a good way to distinguish whether a set of four registers came from an integer or a float. The main test demonstrating this change is `store_perturbed` in `llvm/test/CodeGen/X86/i128-fp128-abi.ll`. Referenced ABI: https://gitlab.com/x86-psABIs/i386-ABI/-/wikis/uploads/14c05f1b1e156e0e46b61bfa7c1df1e2/intel386-psABI-2020-08-07.pdf Fixes: https://github.com/llvm/llvm-project/issues/77401 (cherry picked from commit a78a0f8d204393a0cce367b63395bad90311c1b8)
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.