Systems, Methods, And Computer Products For Compiler Support For Aggressive Safe Load Speculation

摘要

Systems, methods and computer products for compiler support for aggressive safe load speculation. Exemplary embodiments include a method for aggressive safe load speculation for a compiler in a computer system, the method including building a control flow graph, identifying both countable and non-countable loops, gathering a set of candidate loops for load speculation, for each candidate loop in the set of candidate loops gathered for load speculation performing computing an estimate of the iteration count, delay cycles, and code size, performing a profitability analysis and determine an unroll factor based on the delay cycles and the code size, transforming the loop by generating a prologue loop to achieve data alignment and an unrolled main loop with loop directives, indicating which loads can safely be executed speculatively and performing low-level instruction on the generated unrolled main loop.