Compiler Software Pipelining Initiation Interval Reduction

The patent segments the loop body into multiple instruction groups (G1, G2, G3, etc.) that can be executed in parallel across different iterations. By dividing the loop body into independent instruction groups with proper dependence handling, the compiler can schedule instructions from different groups to execute simultaneously, reducing the initiation interval while respecting hardware resource constraints and data dependence relations.

The patent performs preliminary analysis of data dependence relations and hardware resource constraints before generating the final instruction schedule. The compiler identifies loop-carried dependences and resource conflicts in advance, then pre-arranges instruction grouping and scheduling strategies that minimize the initiation interval while ensuring all constraints are satisfied during parallel execution.

The patent applies different scheduling strategies to different instruction groups based on their specific resource requirements and dependence characteristics. Each instruction group is analyzed locally to determine its resource profile, and scheduling decisions are made tailored to each group's needs rather than applying a uniform scheduling approach, thereby reducing resource conflicts while maintaining parallel execution efficiency.

The patent introduces instruction groups as intermediary units between individual instructions and iterations. These groups act as mediators that bundle related instructions together, manage resource allocation within the group, and coordinate with other groups to reduce overall resource conflicts. The grouping mechanism provides an intermediate level of abstraction that simplifies resource coordination during parallel execution.