[Tblgen][MCA] Add the ability to mark groups as LoadQueue and StoreQu…

…eue. NFCI

Before this patch, users were not allowed to optionally mark processor resource
groups as load/store queues. That is because tablegen class MemoryQueue was
originally declared as expecting a ProcResource template argument (instead of a
more generic ProcResourceKind).

That was an oversight, since the original intention from D54957 was to let user
mark any processor resource as either load/store queue.  This patch adds the
ability to use processor resource groups in MemoryQueue definitions. This is not
a user visible change.

Differential Revision: https://reviews.llvm.org/D66810

llvm-svn: 370091

llvm/include/llvm/Target/TargetSchedule.td

@@ -563,10 +563,10 @@ class RetireControlUnit<int bufferSize, int retirePerCycle> {
 
 // Base class for Load/StoreQueue.  It is used to identify processor resources
 // which describe load/store queues in the LS unit.
-class MemoryQueue<ProcResource PR> {
-  ProcResource QueueDescriptor = PR;
+class MemoryQueue<ProcResourceKind PR> {
+  ProcResourceKind QueueDescriptor = PR;
   SchedMachineModel SchedModel = ?;
 }
 
-class LoadQueue<ProcResource LDQueue> : MemoryQueue<LDQueue>;
-class StoreQueue<ProcResource STQueue> : MemoryQueue<STQueue>;
+class LoadQueue<ProcResourceKind LDQueue> : MemoryQueue<LDQueue>;
+class StoreQueue<ProcResourceKind STQueue> : MemoryQueue<STQueue>;

llvm/lib/MCA/HardwareUnits/LSUnit.cpp

@@ -29,12 +29,12 @@ LSUnitBase::LSUnitBase(const MCSchedModel &SM, unsigned LQ, unsigned SQ,
     const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo();
     if (!LQSize && EPI.LoadQueueID) {
       const MCProcResourceDesc &LdQDesc = *SM.getProcResource(EPI.LoadQueueID);
-      LQSize = LdQDesc.BufferSize;
+      LQSize = std::max(0, LdQDesc.BufferSize);
     }
 
     if (!SQSize && EPI.StoreQueueID) {
       const MCProcResourceDesc &StQDesc = *SM.getProcResource(EPI.StoreQueueID);
-      SQSize = StQDesc.BufferSize;
+      SQSize = std::max(0, StQDesc.BufferSize);
     }
   }
 }