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The AAPCS treats small structs and homogeneous floating (or vector) aggregates specially, and guarantees they either get passed as a contiguous block of registers, or prevent any future use of those registers and get passed on the stack. This concept can fit quite neatly into LLVM's own type system, mapping an HFA to [N x float] and so on, and small structs to [N x i64]. Doing so allows front-ends to emit AAPCS compliant code without having to duplicate the register counting logic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222903 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.