IF-CONVERSION CONTROLLED BY INSTRUCTION SCHEDULING

摘要

Architectures having predicated (conditional) execution of instructions, can benefit from a compiler optimization called IF-conversion. As a result of IF-conversion, the code which previously was on different branches of one or more conditions, now coexist on the same execution path, but having different predicates. To avoid decreasing code performances, IF-conversion can be controlled through another compiler optimization, called Instruction Scheduling. Instruction Scheduling and IF-conversion can improve code performances by getting a better scheduling on the hyperblocks than on the separate blocks in the control-flow paths and by establishing if applying the IF-conversion would be beneficial.