Short Circuit Evaluation

src/IceTargetLoweringX86BaseImpl.h

 //===- subzero/src/IceTargetLoweringX86BaseImpl.h - x86 lowering -*- C++ -*-==//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 429 matching lines @@
 
   // Merge Alloca instructions, and lay out the stack.
   static constexpr bool SortAndCombineAllocas = true;
   Func->processAllocas(SortAndCombineAllocas);
   Func->dump("After Alloca processing");
 
   if (getFlags().getEnableExperimental()) {
     Func->localCSE();
     Func->dump("After Local CSE");
   }
+  if (getFlags().getEnableShortCircuit()) {
+    Func->shortCircuitJumps();
+    Func->dump("After Short Circuiting");
+  }
 
   if (!getFlags().getEnablePhiEdgeSplit()) {
     // Lower Phi instructions.
     Func->placePhiLoads();
     if (Func->hasError())
       return;
     Func->placePhiStores();
     if (Func->hasError())
       return;
     Func->deletePhis();
@@ skipping 89 matching lines @@
   Func->contractEmptyNodes();
   Func->reorderNodes();
 
   // Shuffle basic block order if -reorder-basic-blocks is enabled.
   Func->shuffleNodes();
 
   // Branch optimization.  This needs to be done just before code emission. In
   // particular, no transformations that insert or reorder CfgNodes should be
   // done after branch optimization. We go ahead and do it before nop insertion
   // to reduce the amount of work needed for searching for opportunities.
+

[Jim Stichnoth, 2016/06/27 22:41:59]

I would remove this newline.

[manasijm, 2016/06/27 22:56:32]

Done.

   Func->doBranchOpt();
   Func->dump("After branch optimization");
 
   // Nop insertion if -nop-insertion is enabled.
   Func->doNopInsertion();
 
   // Mark nodes that require sandbox alignment
   if (NeedSandboxing) {
     Func->markNodesForSandboxing();
   }
@@ skipping 7459 matching lines @@
         emitGlobal(*Var, SectionSuffix);
       }
     }
   } break;
   }
 }
 } // end of namespace X86NAMESPACE
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX86BASEIMPL_H