cpu: Add instruction opclass histogram to minor

src/cpu/minor/execute.cc

@@ -849,6 +849,8 @@ Execute::doInstCommitAccounting(MinorDynInstPtr inst)
     thread->numOp++;
     thread->numOps++;
     cpu.stats.numOps++;
+    cpu.stats.committedInstType[inst->id.threadId]
+                               [inst->staticInst->opClass()]++;
 
     /* Set the CP SeqNum to the numOps commit number */
     if (inst->traceData)

src/cpu/minor/stats.cc

@@ -82,6 +82,13 @@ MinorStats::regStats(const std::string &name, BaseCPU &baseCpu)
         .desc("IPC: instructions per cycle")
         .precision(6);
     ipc = numInsts / baseCpu.numCycles;
+
+    committedInstType
+        .init(baseCpu.numThreads, Enums::Num_OpClass)
+        .name(name + ".op_class")
+        .desc("Class of committed instruction")
+        .flags(Stats::total | Stats::pdf | Stats::dist);
+    committedInstType.ysubnames(Enums::OpClassStrings);
 }
 
 };

src/cpu/minor/stats.hh

@@ -76,6 +76,9 @@ class MinorStats
     Stats::Formula cpi;
     Stats::Formula ipc;
 
+    /** Number of instructions by type (OpClass) */
+    Stats::Vector2d committedInstType;
+
   public:
     MinorStats();