LLVM LLVM is a compiler infrastructure designed for compile-time, link-time, runtime, and
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linux programming language compiler linux compiler program optimization LLVM

LLVM Description

LLVM is a compiler infrastructure designed for compile-time, link-time, runtime, and LLVM is a compiler infrastructure designed for compile-time, link-time, runtime, and "idle-time" optimization of programs from arbitrary programming languages. LLVM currently supports compilation of C++ and C programs, using front-ends derived from gcc 3.4.There is a demonstration front end, Stacker, which provides a simple forth-like language. Work is currently under way to provide a Java class file front-end, as well as other significant improvements.- A compilation strategy designed to enable effective program optimization across the entire lifetime of a program. LLVM supports effective optimization at compile time, link-time (particularly interprocedural), run-time and offline (i.e., after software is installed), while remaining transparent to developers and maintaining compatibility with existing build scripts.- A virtual instruction set - LLVM is a low-level object code representation that uses simple RISC-like instructions, but provides rich, language-independent, type information and dataflow (SSA) information about operands. This combination enables sophisticated transformations on object code, while remaining light-weight enough to be attached to the executable. This combination is key to allowing link-time, run-time, and offline transformations.- A compiler infrastructure - LLVM is also a collection of source code that implements the language and compilation strategy. The primary components of the LLVM infrastructure are a GCC-based C & C++ front-end, a link-time optimization framework with a growing set of global and interprocedural analyses and transformations, static back-ends for the X86, PowerPC, IA-64, Alpha, & SPARC V9 architectures, a back-end which emits portable C code, and a Just-In-Time compiler for X86, PowerPC, and SPARC V9 processors.LLVM does not imply things that you would expect from a high-level virtual machine. It does not require garbage collection or run-time code generation (In fact, LLVM makes a great static compiler!). Note that optional LLVM components can be used to build high-level virtual machines and other systems that need these services.LLVM is a robust system, particularly well suited for developing new mid-level language-independent analyses and optimizations of all sorts, including those that require extensive interprocedural analysis.LLVM is also a great target for front-end development for conventional or research programming languages, including those which require compile-time, link-time, or run-time optimization for effective implementation, proper tail calls or garbage collection.We have an incomplete list of projects which have used LLVM for various purposes, showing that you can get up-and-running quickly with LLVM, giving time to do interesting things, even if you only have a semester in a University course. We also have a list of ideas for projects in LLVM. What's New in This Release: · Clang now has a new driver, which is focused on providing a GCC-compatible interface. · The X86-64 ABI is now supported, including support for the Apple 64-bit Objective-C runtime and zero cost exception handling. · Precompiled header support is now implemented. · Objective-C support is significantly improved beyond LLVM 2.4, supporting many features, such as Objective-C Garbage Collection. · Variable length arrays are now fully supported. · C99 designated initializers are now fully supported. · Clang now includes all major compiler headers, including a redesigned tgmath.h and several more intrinsic headers. · Many many bugs are fixed and many features have been added.

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