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In practice, Clang is a drop-in replacement for GCC. [24] Clang's developers aim to reduce memory footprint and increase compiling speed compared to other compilers, such as GCC. In October 2007, they report that Clang compiled the Carbon libraries more than twice as fast as GCC, while using about one-sixth GCC's memory and disk space. [25]
Whether particular optimizations can and should be applied may depend on the characteristics of the target machine. Some compilers such as GCC and Clang parameterize machine-dependent factors so that they can be used to optimize for different machines. [7] Target CPU architecture. Number of registers: Registers can be used to optimize for ...
The AMD Optimizing C/C++ Compiler (AOCC) is an optimizing C/C++ and Fortran compiler suite from AMD targeting 32-bit and 64-bit Linux platforms. [1] [2] It is a proprietary fork of LLVM + Clang with various additional patches to improve performance for AMD's Zen microarchitecture in Epyc, and Ryzen microprocessors.
Whole program optimization (WPO) is the compiler optimization of a program using information about all the modules in the program. Normally, optimizations are performed on a per module, "compiland", basis; but this approach, while easier to write and test and less demanding of resources during the compilation itself, does not allow certainty about the safety of a number of optimizations such ...
Some features of C11 are supported by the GCC starting with version 4.6, [16] Clang starting with version 3.1, [17] IBM XL C starting with version 12.1, [18] and Microsoft Visual C++ starting with VS 2019 (16.8) [19] in September 2020.
GCC and clang requires explicit target_clones labels in the code to "clone" functions, [20] while ICC does so automatically (under the command-line option /Qax). The Rust programming language also supports FMV. The setup is similar to GCC and Clang in that the code defines what instruction sets to compile for, but cloning is manually done via ...
However, as of clang 12.0.0 and gcc 11.1, this loop fusion and redundant allocation removal does not occur - even on the highest optimization level. [ 7 ] [ 8 ] Some languages specifically targeted towards numerical computing such as Julia might have the concept of loop fusion built into it at a high level, where the compiler will notice ...
Apple was a significant user of LLVM-GCC through Xcode 4.x (2013). [44] [45] This use of the GCC frontend was considered mostly a temporary measure, but with the advent of Clang and advantages of LLVM and Clang's modern and modular codebase (as well as compilation speed), is mostly obsolete.