This book offers a comprehensive introduction to the RISC-V RVV extension and its integration
with LLVM-based compilers. It covers the LLVM VPlan-based Loop Vectorizer and SLP Vectorizer
along with additional insights into the clang frontend OpenMP support and RVV-specific clang
directives provided by SiFive. Given the limited information currently available on RVV and its
support in modern compilers this book fills a crucial gap. RVV introduces a unique approach to
vectorization-Vector Length Agnostic (VLA) vectorization-which stands out from the fixed
vectors of x86 and the runtime-defined yet fixed ARM-based SVE and SVE2 extensions. Readers
will gain an understanding of RVV-specific VLA-based vectorization support in LLVM-based
compilers which are still under development. The book also provides early insights into the
ongoing support for RVV in LLVM. What You'll Learn Gain foundational knowledge of RISC-V and
the RVV extension. Learn design and implementation of LLVM vectorizers. Learn to optimize
performance with RVV-specific clang directives. Explore the unique Vector Length Agnostic
(VLA) vectorization. Discover the differences between RVV and other vector extensions. Who
This Book Is For 1. For the engineers who would like to get more info about RISC-V in general
and RISC-V Vectorextension particularly. 2. For the developers trying to get the performance
using RVV. 3. For LLVM compiler developers trying or learn more about vectorization support in
LLVM.4. 4. For the students who learn new about RISC- V its extensions interested in
compiler development.
