Subzero: Add rudimentary statistics on generated code.

src/IceCfgNode.cpp

 //===- subzero/src/IceCfgNode.cpp - Basic block (node) implementation -----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the CfgNode class, including the complexities
@@ skipping 465 matching lines @@
   for (InstList::const_iterator I = Insts.begin(), E = Insts.end(); I != E;
        ++I) {
     Inst *Inst = *I;
     if (Inst->isDeleted())
       continue;
     // Here we detect redundant assignments like "mov eax, eax" and
     // suppress them.
     if (Inst->isRedundantAssign())
       continue;
     (*I)->emit(Func);
+    // Update emitted instruction count, plus fill/spill count for
+    // Variable operands without a physical register.
+    if (uint32_t Count = (*I)->getEmitInstCount()) {

[jvoung (off chromium), 2014/09/17 01:21:12]

At some point we'll have to have a convention for omitting code from Release
builds.

+      Func->getContext()->statsUpdateEmitted(Count);
+      if (Variable *Dest = (*I)->getDest()) {
+        if (!Dest->hasReg())
+          Func->getContext()->statsUpdateFills();
+      }
+      for (SizeT S = 0; S < (*I)->getSrcSize(); ++S) {
+        if (Variable *Src = llvm::dyn_cast<Variable>((*I)->getSrc(S))) {
+          if (!Src->hasReg())
+            Func->getContext()->statsUpdateSpills();
+        }
+      }
+    }
   }
 }
 
 void CfgNode::dump(Cfg *Func) const {
   Func->setCurrentNode(this);
   Ostream &Str = Func->getContext()->getStrDump();
   Liveness *Liveness = Func->getLiveness();
   if (Func->getContext()->isVerbose(IceV_Instructions)) {
     Str << getName() << ":\n";
   }
@@ skipping 54 matching lines @@
          I != E; ++I) {
       if (I != OutEdges.begin())
         Str << ", ";
       Str << "%" << (*I)->getName();
     }
     Str << "\n";
   }
 }
 
 } // end of namespace Ice