Disable Subzero IR generation for performance testing.

src/llvm2ice.cpp

 //===- subzero/src/llvm2ice.cpp - Driver for testing ----------------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines a driver that uses LLVM capabilities to parse a
@@ skipping 76 matching lines @@
                                         cl::init("-"),
                                         cl::value_desc("filename"));
 static cl::opt<std::string>
 TestPrefix("prefix", cl::desc("Prepend a prefix to symbol names for testing"),
            cl::init(""), cl::value_desc("prefix"));
 static cl::opt<bool>
 DisableInternal("externalize",
                 cl::desc("Externalize all symbols"));
 static cl::opt<bool>
 DisableTranslation("notranslate", cl::desc("Disable Subzero translation"));
+static cl::opt<bool>
+    DisableIRGeneration("noIRgen", cl::desc("Disable generating Subzero IR."));
 static cl::opt<std::string>
 TranslateOnly("translate-only", cl::desc("Translate only the given function"),
               cl::init(""));
 
 static cl::opt<bool> SubzeroTimingEnabled(
     "timing", cl::desc("Enable breakdown timing of Subzero translation"));
 
 static cl::opt<bool>
 TimeEachFunction("timing-funcs",
                  cl::desc("Print total translation time for each function"));
@@ skipping 113 matching lines @@
              << ConditionalBuildAttributes[i].FlagValue;
       report_fatal_error(StrBuf.str());
     }
     }
   }
 }
 
 int main(int argc, char **argv) {
 
   cl::ParseCommandLineOptions(argc, argv);
 

[jvoung (off chromium), 2014/11/04 22:30:15]

I wonder if there will be an easy way to compile-out the non-asserting
DisableIRGeneration checks that do bail outs, set nullptr, etc. for a minimal
build.  Can it be done by forcing DisableIRGeneration to false?

[Karl, 2014/11/05 21:13:34]

Done.

+  if (DisableIRGeneration)
+    DisableTranslation = true;
+
   Ice::VerboseMask VMask = Ice::IceV_None;
   for (unsigned i = 0; i != VerboseList.size(); ++i)
     VMask |= VerboseList[i];
 
   std::ofstream Ofs;
   if (OutputFilename != "-") {
     Ofs.open(OutputFilename.c_str(), std::ofstream::out);
   }
   raw_os_ostream *Os =
       new raw_os_ostream(OutputFilename == "-" ? std::cout : Ofs);
@@ skipping 21 matching lines @@
   Flags.PhiEdgeSplit = EnablePhiEdgeSplit;
   Flags.DecorateAsm = DecorateAsm;
   Flags.DumpStats = DumpStats;
   Flags.AllowUninitializedGlobals = AllowUninitializedGlobals;
   Flags.TimeEachFunction = TimeEachFunction;
   Flags.DefaultGlobalPrefix = DefaultGlobalPrefix;
   Flags.DefaultFunctionPrefix = DefaultFunctionPrefix;
   Flags.TimingFocusOn = TimingFocusOn;
   Flags.VerboseFocusOn = VerboseFocusOn;
   Flags.TranslateOnly = TranslateOnly;
+  Flags.DisableIRGeneration = DisableIRGeneration;
 
   Ice::GlobalContext Ctx(Ls, Os, VMask, TargetArch, OptLevel, TestPrefix,
                          Flags);
 
   Ice::TimerMarker T(Ice::TimerStack::TT_szmain, &Ctx);
 
   int ErrorStatus = 0;
   if (BuildOnRead) {
     Ice::PNaClTranslator Translator(&Ctx, Flags);
     Translator.translate(IRFilename);
@@ skipping 21 matching lines @@
   if (SubzeroTimingEnabled)
     Ctx.dumpTimers();
   if (TimeEachFunction) {
     const bool DumpCumulative = false;
     Ctx.dumpTimers(Ice::GlobalContext::TSK_Funcs, DumpCumulative);
   }
   const bool FinalStats = true;
   Ctx.dumpStats("_FINAL_", FinalStats);
   return GetReturnValue(ErrorStatus);
 }