PHI: A Modern C++ Library for Parallel Pattern Composition

This paper presents the design of PHI, a modern C++ library that allows for the composable expression of parallel computation patterns. Building upon the principles of GrPPI, PHI introduces a range-like interface that enables for declarative composition of parallel patterns by means of a pipe-like syntax that better aligns with contemporary C++ idioms. Additionally, PHI's architecture aims to separate pattern composition from its execution, allowing for backend-agnostic implementations, and the potential to integrate various execution models.