[llvm-dev] Question about Hexagon VLIWResourceModel::reserveResources (original) (raw)
陳韋任 via llvm-dev llvm-dev at lists.llvm.org
Fri Apr 21 08:22:47 PDT 2017
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Hi All,
I am reading Hexagon's VLIW scheduler source code, and have a question about VLIWResourceModel::reserveResources.
From what I understand, it checks if a SU can be put in current Packet. Intuitively, if current Packet is full, isResourceAvailable should return false immediately. However, I see the code below:
// If packet is now full, reset the state so in the next cycle // we start fresh. if (Packet.size() >= SchedModel->getIssueWidth()) { ResourcesModel->clearResources(); savePacket(); Packet.clear(); TotalPackets++; startNewCycle = true; }
I don't see reserveResources check if the Packet is full already, and it seems possible that we have Packet.size >= SchedModel->getIssueWidth(). Is the Packet valid?
Thanks.
Regards, chenwj
-- Wei-Ren Chen (陳韋任) Homepage: https://people.cs.nctu.edu.tw/~chenwj
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