LLVM LANGREF PDF

Function types are also used to indicate the arguments and results of operations. Unlike fixed-size integers, it cannot be used as an element of vector, tensor or memref type rationale. Rationale: integers of platform-specific bit widths are practical to express sizes, dimensionalities and subscripts. Integer types have a designated width and may have signedness semantics. TODO: Need to decide on a representation for quantized integers initial thoughts.

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Despite its name, LLVM has little to do with traditional virtual machines. The name "LLVM" itself is not an acronym; it is the full name of the project.

LLVM began as a research project at the University of Illinois , with the goal of providing a modern, SSA-based compilation strategy capable of supporting both static and dynamic compilation of arbitrary programming languages. Since then, LLVM has grown to be an umbrella project consisting of a number of subprojects, many of which are being used in production by a wide variety of commercial and open source projects as well as being widely used in academic research.

The LLVM Core libraries are well documented , and it is particularly easy to invent your own language or port an existing compiler to use LLVM as an optimizer and code generator. It is also blazing fast and much more memory efficient than GDB at loading symbols. The MLIR subproject is a novel approach to building reusable and extensible compiler infrastructure.

MLIR aims to address software fragmentation, improve compilation for heterogeneous hardware, significantly reduce the cost of building domain specific compilers, and aid in connecting existing compilers together. The polly project implements a suite of cache-locality optimizations as well as auto-parallelism and vectorization using a polyhedral model.

The libclc project aims to implement the OpenCL standard library. The klee project implements a "symbolic virtual machine" which uses a theorem prover to try to evaluate all dynamic paths through a program in an effort to find bugs and to prove properties of functions. A major feature of klee is that it can produce a testcase in the event that it detects a bug. The LLD project is a new linker. That is a drop-in replacement for system linkers and runs much faster. A major strength of LLVM is its versatility, flexibility, and reusability, which is why it is being used for such a wide variety of different tasks: everything from doing light-weight JIT compiles of embedded languages like Lua to compiling Fortran code for massive super computers.

As much as everything else, LLVM has a broad and friendly community of people who are interested in building great low-level tools. For information on how to send in a patch, get commit access, and copyright and license topics, please see the LLVM Developer Policy. LLVM is publicly available under an open source License. This award is given by ACM to one software system worldwide every year. LLVM is in highly distinguished company!

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