search for: predcost

We'd like to be able to vary the latency of our load instructions based on what address space is being loaded from. I was thinking I could do this by overriding getOperandLatency in our target, but I'm wondering if the addrspace info is available when instructions are scheduled? For example, I have this in our llvm IR: %0 = load i32 addrspace(4)* @answer, align 4 store i32 %0, i32*

...TENTION: Out of tree targets! (I will also send out an email later to LLVMDev) This means, if your target implements unsigned getInstrLatency(const InstrItineraryData *ItinData, const MachineInstr *MI, unsigned *PredCost); and returns a value for "PredCost", you now also need to implement unsigned getPredictationCost(const MachineInstr *MI); (if your target uses the IfConversion.cpp pass) Best, Arnold

On Tue, Nov 17, 2015 at 11:15 AM, Krzysztof Parzyszek < kparzysz at codeaurora.org> wrote: > On 11/17/2015 12:26 PM, Rail Shafigulin wrote: > >> >> I tried setting >> let mayLoad = 1 { >> class InstrLD .... { >> } >> } >> >> But that didn't seem to work. When I looked at the debug output the >> latency for the load

...*UseMI, unsigned UseIdx) const; virtual unsigned TargetInstrInfo::getInstrLatency(const InstrItineraryData *ItinData, const MachineInstr *MI, unsigned *PredCost = 0) const; Example: def CortexA8Model : SchedMachineModel { ... let Itineraries = CortexA8Itineraries; } If you don't actually have any itineraries defined in you target's Schedule.td files, you need to define some dummy itinerary with at least one entry. Something like this may w...