PNaCl translator: combine insertelement / extractelement patterns generated by the toolchain into s…

tools/pnacl-llc/pnacl-llc.cpp

 //===-- pnacl-llc.cpp - PNaCl-specific llc: pexe ---> nexe  ---------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // pnacl-llc: the core of the PNaCl translator, compiling a pexe into a nexe.
@@ skipping 402 matching lines @@
 
   // Add the intrinsic resolution pass. It assumes ABI-conformant code.
   PM->add(createResolvePNaClIntrinsicsPass());
 
   // Add an appropriate TargetLibraryInfo pass for the module's triple.
   TargetLibraryInfo *TLI = new TargetLibraryInfo(TheTriple);
   if (DisableSimplifyLibCalls)
     TLI->disableAllFunctions();
   PM->add(TLI);
 
+  // Allow subsequent passes to better optimize vector instructions.
+  // This pass uses the TargetLibraryInfo above.
+  PM->add(createCombineVectorInstructionsPass());
+
   // Add intenal analysis passes from the target machine.
   Target.addAnalysisPasses(*PM.get());
 
   // Add the target data from the target machine, if it exists, or the module.
   if (const DataLayout *TD = Target.getDataLayout())
     PM->add(new DataLayout(*TD));
   else
     PM->add(new DataLayout(mod));
 
   // Ask the target to add backend passes as necessary. We explicitly ask it
@@ skipping 324 matching lines @@
   return 0;
 }
 
 int main(int argc, char **argv) {
 #if defined(__native_client__)
   return srpc_main(argc, argv);
 #else
   return llc_main(argc, argv);
 #endif // __native_client__
 }