The superblock: an effective technique for VLIW and superscalar compilation. The Journal of Supercomputing 7

Abstract. A compiler for VLIW and superscalar processors must expose sufficient instruction-level parallelism (ILP) to effectively utilize the parallel hardware. However, ILP within basic blocks is extremely limited for control-intensive programs. We have developed a set of techniques for exploiting ILP across basic block boundaries. These techniques are based on a novel structure called the superblock. The superblock enables the optimizer and scheduler toextract more ILP along the important execution paths by systematically removing constraints due to the unimportant paths. Superblock optimization a d scheduling have been implemented in the IMPACT-I compiler. This implementation gives us a unique opportunity to fully understand the issues involved inincorporat-ing these techniques into a real compiler. Superblock optimizations and scheduling are shown to be useful while taking into account avariety of architectural features