aaron.ballman added inline comments.
================ Comment at: include/clang/Basic/AttrDocs.td:2650 + Software Pipelining optimization is a technique used to optimize loops by + utilizing instructions level parallelism. It reorders loop instructions to + overlap iterations. As the result next iteration started before previous ---------------- instructions level -> instruction-level ================ Comment at: include/clang/Basic/AttrDocs.td:2651 + utilizing instructions level parallelism. It reorders loop instructions to + overlap iterations. As the result next iteration started before previous + have finished. The Modulo Scheduling technique creates schedule for one ---------------- As a result, the next iteration starts before the previous iteration has finished. ================ Comment at: include/clang/Basic/AttrDocs.td:2652-2654 + have finished. The Modulo Scheduling technique creates schedule for one + iteration such that when repeating at regular interval no inter-iteration + dependence violated. This constant interval(in cycles) between the start ---------------- The module scheduling technique creates a schedule for one iteration such that when repeating at regular intervals, no inter-iteration dependencies are violated. ================ Comment at: include/clang/Basic/AttrDocs.td:2655 + dependence violated. This constant interval(in cycles) between the start + of iterations called initiation interval. Cycles number of one iteration + of newly generated loop matches with Initiation Interval. For further ---------------- is called the initiation interval. I can't quite parse the second sentence, though. Is it trying to say that the initiation interval is the number of cycles for a single iteration of the optimized loop? ================ Comment at: include/clang/Basic/AttrDocs.td:2676 + the software pipeliner to try the specified initiation interval. + If schedule found the resulting loop iteration would have specified + cycle count. The positive number greater than zero can be specified: ---------------- I'm can't quite parse this sentence either. Is it trying to say that the scheduler will try to find a loop iteration cycle count that most-closely matches the specified initiation interval? ================ Comment at: include/clang/Basic/AttrDocs.td:2677 + If schedule found the resulting loop iteration would have specified + cycle count. The positive number greater than zero can be specified: + ---------------- The initiation interval must be a positive number greater than zero. CHANGES SINCE LAST ACTION https://reviews.llvm.org/D55710/new/ https://reviews.llvm.org/D55710 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
