Handle ARM "ret void" and function alignment with proper padding.

src/IceClFlags.cpp

 //===- subzero/src/IceClFlags.cpp - Command line flags and parsing --------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines commandline flags parsing.
@@ skipping 93 matching lines @@
 
 cl::opt<bool> ShouldDoNopInsertion("nop-insertion",
                                    cl::desc("Randomly insert NOPs"),
                                    cl::init(false));
 
 cl::opt<bool>
     RandomizeRegisterAllocation("randomize-regalloc",
                                 cl::desc("Randomize register allocation"),
                                 cl::init(false));
 
+cl::opt<bool> SkipUnimplemented(
+    "skip-unimplemented",
+    cl::desc("Skip through unimplemented lowering code instead of aborting."),
+    cl::init(false));
+
 cl::opt<bool> SubzeroTimingEnabled(
     "timing", cl::desc("Enable breakdown timing of Subzero translation"));
 
 cl::opt<Ice::TargetArch> TargetArch(
     "target", cl::desc("Target architecture:"), cl::init(Ice::Target_X8632),
     cl::values(
         clEnumValN(Ice::Target_X8632, "x8632", "x86-32"),
         clEnumValN(Ice::Target_X8632, "x86-32", "x86-32 (same as x8632)"),
         clEnumValN(Ice::Target_X8632, "x86_32", "x86-32 (same as x8632)"),
         clEnumValN(Ice::Target_X8664, "x8664", "x86-64"),
@@ skipping 129 matching lines @@
   OutFlags.DecorateAsm = false;
   OutFlags.DisableInternal = false;
   OutFlags.DisableIRGeneration = false;
   OutFlags.DisableTranslation = false;
   OutFlags.DumpStats = false;
   OutFlags.FunctionSections = false;
   OutFlags.GenerateUnitTestMessages = false;
   OutFlags.PhiEdgeSplit = false;
   OutFlags.RandomNopInsertion = false;
   OutFlags.RandomRegAlloc = false;
+  OutFlags.SkipUnimplemented = false;
   OutFlags.SubzeroTimingEnabled = false;
   OutFlags.TimeEachFunction = false;
   OutFlags.UseSandboxing = false;
   // Enum and integer fields.
   OutFlags.Opt = Opt_m1;
   OutFlags.OutFileType = FT_Iasm;
   OutFlags.RandomMaxNopsPerInstruction = 0;
   OutFlags.RandomNopProbabilityAsPercentage = 0;
   OutFlags.TArch = TargetArch_NUM;
   OutFlags.VMask = IceV_None;
@@ skipping 31 matching lines @@
   OutFlags.setDisableIRGeneration(::DisableIRGeneration);
   OutFlags.setDisableTranslation(::DisableTranslation);
   OutFlags.setDumpStats(::DumpStats);
   OutFlags.setFunctionSections(::FunctionSections);
   OutFlags.setNumTranslationThreads(::NumThreads);
   OutFlags.setOptLevel(::OLevel);
   OutFlags.setPhiEdgeSplit(::EnablePhiEdgeSplit);
   OutFlags.setRandomSeed(::RandomSeed);
   OutFlags.setShouldDoNopInsertion(::ShouldDoNopInsertion);
   OutFlags.setShouldRandomizeRegAlloc(::RandomizeRegisterAllocation);
+  OutFlags.setSkipUnimplemented(::SkipUnimplemented);
   OutFlags.setSubzeroTimingEnabled(::SubzeroTimingEnabled);
   OutFlags.setTargetArch(::TargetArch);
   OutFlags.setTargetInstructionSet(::TargetInstructionSet);
   OutFlags.setTestPrefix(::TestPrefix);
   OutFlags.setTimeEachFunction(::TimeEachFunction);
   OutFlags.setTimingFocusOn(::TimingFocusOn);
   OutFlags.setTranslateOnly(::TranslateOnly);
   OutFlags.setUseSandboxing(::UseSandboxing);
   OutFlags.setVerboseFocusOn(::VerboseFocusOn);
   OutFlags.setOutFileType(::OutFileType);
   OutFlags.setMaxNopsPerInstruction(::MaxNopsPerInstruction);
   OutFlags.setNopProbabilityAsPercentage(::NopProbabilityAsPercentage);
   OutFlags.setVerbose(VMask);
 }
 
 void ClFlags::getParsedClFlagsExtra(ClFlagsExtra &OutFlagsExtra) {
   OutFlagsExtra.setAlwaysExitSuccess(AlwaysExitSuccess);
   OutFlagsExtra.setBuildOnRead(BuildOnRead);
   OutFlagsExtra.setGenerateBuildAtts(GenerateBuildAtts);
   OutFlagsExtra.setLLVMVerboseErrors(LLVMVerboseErrors);
   OutFlagsExtra.setAppName(AppName);
   OutFlagsExtra.setInputFileFormat(InputFileFormat);
   OutFlagsExtra.setIRFilename(IRFilename);
   OutFlagsExtra.setLogFilename(LogFilename);
   OutFlagsExtra.setOutputFilename(OutputFilename);
 }
 
 } // end of namespace Ice