search for: brpomkuynea

Hi all, Can anyone tell me the current state of instruction scheduling in LLVM, i.e. what all internal scheduling algorithms and whether constraint solving methods are used in LLVM for a single issue processor ? Please let me know if anyone has any information about it. Thanks, Siddharth -------------- next part -------------- An HTML attachment was scrubbed... URL:

...htfoward to specify special constraints, like bypassing. It's fairly easy to extend certain opcodes with predicates (callbacks) that depend on immediate values or any other arbtrary info. See Javed and Florian's tutorial on the "new" machine model: https://www.youtube.com/watch?v=brpomKUynEA Itineraries are not strictly more powerful. The original motivation for the new machine description is that there were important issue constraints that weren't being correctly modeled by the itineraries. The only advantage of itineraries that I'm aware of is that, for instructions that use...

...CV[7] and give us some suggestion, thanks a lot! [1] https://en.wikipedia.org/wiki/Compilers:_Principles,_Techniques,_and_Tools [2] https://llvm.org/devmtg/2014-10/Slides/Estes-MISchedulerTutorial.pdf [3] https://llvm.org/devmtg/2016-09/slides/Absar-SchedulingInOrder.pdf [4] https://youtu.be/brpomKUynEA [5] https://github.com/lowRISC/riscv-llvm/issues/27 [6] https://riscv.org/wp-content/uploads/2016/01/Wed1345-RISCV-Workshop-3-BOOM.pdf [7] http://lists.llvm.org/pipermail/llvm-dev/2018-January/120098.html -- Regards, Leslie Zhai - https://reviews.llvm.org/p/xiangzhai/

Hi, What is the best way to model a scheduler for a VLIW in-order architecture? I've looked at the Hexagon and R600 architectures and they are using itineraries. I wanted to understand the benefit in using itineraries over the per operand scheduling. I also found this thread from almost 2 years ago: http://lists.llvm.org/pipermail/llvm-dev/2016-April/098763.html At that time it seemed the