POLSCA: Polyhedral high-level synthesis with compiler transformations

Polyhedral optimization can parallelize nested affine loops for high-level synthesis (HLS), but polyhedral tools are HLS-agnostic and can worsen performance. Moreover, HLS tools require user directives which can produce unreadable polyhedral- transformed code. To address these two challenges, we present POLSCA, a compiler framework that improves polyhedral HLS workflow by automatic code transformation. POLSCA decom- poses a design before polyhedral optimization to balance code complexity and parallelism, while revising memory interfaces of polyhedral-transformed code to make partitioning explicit for HLS tools; it enables designs to benefit more easily from polyhedral optimization. Experiments on Polybench/C show that POLSCA designs are 1.5 times faster on average compared with baseline designs generated directly from applying HLS on C code