[RFC] Ripple: A Compiler-Interpreted API for Efficient SIMD Programming TL;DR We have been working on Ripple, a lean addition to LLVM to support Single-Program, Multiple-Data (SPMD) and loop-annotation-based parallel programming for SIMD hardware. We propose a parallel programming API to support these two models, which departs from GPU-style SPMD programming, in that block computations of different dimensions (including 0) can coexist in the same function. This makes it easier to explicitly expr...