search for: checkresourcelimit

Hi, In ConvergingScheduler::checkResourceLimits on line 1535 of MachineScheduler.cpp setLatencyPolicy is called as follows: // Set ReduceLatency to true if needed. Bot.setLatencyPolicy(TopCand.Policy); Top.setLatencyPolicy(BotCand.Policy); So the Bot scheduling boundary is used to set the latency policy of the Top candidate and the...

...del->mustBeginGroup(SU->getInstr())) ||        (!isTop() && SchedModel->mustEndGroup(SU->getInstr())))) , which also per the same lines makes me think that this is intended for the instruction stream management, or (1). There is also the fact that IsResourceLimited =       checkResourceLimit(SchedModel->getLatencyFactor(), getCriticalCount(),                          getScheduledLatency()); , which is to me admittedly hard to grasp, but it seems that the scheduled latency (std::max(ExpectedLatency, CurrCycle)) affects the resource heuristic so that if scheduled latency is low e...

...r())) || > (!isTop() && SchedModel->mustEndGroup(SU->getInstr())))) > > , which also per the same lines makes me think that this is intended for the instruction stream management, or (1). > > There is also the fact that > > IsResourceLimited = > checkResourceLimit(SchedModel->getLatencyFactor(), getCriticalCount(), > getScheduledLatency()); > > , which is to me admittedly hard to grasp, but it seems that the scheduled latency (std::max(ExpectedLatency, CurrCycle)) > affects the resource heuristic so that if scheduled...

Hi Andy, Thanks for the explanations. Yes AMDGPU is in-order and has MicroOpBufferSize = 1. Re "issue limited" and instruction groups: could it make sense to disable the generic scheduler's detection of issue limitation on in-order CPUs, or on CPUs that don't define instruction groups, or some similar condition? Something like: --- a/lib/CodeGen/MachineScheduler.cpp +++