This bachelor thesis deals with support of automatic vectorization of code in the LLVM compilation framework and with extension of Codix processor model of SIMD instructions. As a result, LLVM is able to create reports about the process of auto-vectorization and it is possible to use special pragma directives to provide the compiler with additional information for optimizations of programs. Also a way of providing information about architectures of processors created using development environment Codasip Framework, needed for more effective vectorization, is introduced and implemented. Finally a set of integer vector instructions and related new registers for Codix is chosen and added to the model
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