[NPM] Add -enable-loopinterchange option to NPM

[TaWeiTu]

Summary

We have the enable-loopinterchange option in legacy pass manager but not in NPM.
Add LoopInterchange pass to the optimization pipeline (at the same position as before)
when enable-loopinterchange is turned on.

[aeubanks]

Should this go in the O1 pipeline as well? buildO1FunctionSimplificationPipeline()

[TaWeiTu]

• Add LoopInterchange for O1 as well

[fhahn]

LGTM, thanks!

llvm/lib/Passes/PassBuilder.cpp

754

nit: not sure the comment adds much, as it is directly in the pass name. (same as above)

llvm/lib/Transforms/IPO/PassManagerBuilder.cpp

89

while you are modifying the option, perhaps drop the new bit as well. It's not really new anymore :D

[TaWeiTu]

• Fix nits

llvm/lib/Passes/PassBuilder.cpp

 
 extern cl::opt<bool> EnableConstraintElimination;
 extern cl::opt<bool> EnableGVNHoist;
 extern cl::opt<bool> EnableGVNSink;
 extern cl::opt<bool> EnableHotColdSplit;
 extern cl::opt<bool> EnableIROutliner;
 extern cl::opt<bool> EnableOrderFileInstrumentation;
 extern cl::opt<bool> EnableCHR;
+extern cl::opt<bool> EnableLoopInterchange;
 extern cl::opt<bool> EnableUnrollAndJam;
 extern cl::opt<bool> EnableLoopFlatten;
 extern cl::opt<bool> RunNewGVN;
 extern cl::opt<bool> RunPartialInlining;
 
 extern cl::opt<bool> FlattenedProfileUsed;
 
 extern cl::opt<AttributorRunOption> AttributorRun;
LPM1.addPass(
                              EnableO3NonTrivialUnswitching));
   LPM2.addPass(LoopIdiomRecognizePass());
   LPM2.addPass(IndVarSimplifyPass());
 
   for (auto &C : LateLoopOptimizationsEPCallbacks)
     C(LPM2, Level);
 
   LPM2.addPass(LoopDeletionPass());
+
+  if (EnableLoopInterchange)
+    LPM2.addPass(LoopInterchangePass());
+
   // Do not enable unrolling in PreLinkThinLTO phase during sample PGO
   // because it changes IR to makes profile annotation in back compile
   // inaccurate. The normal unroller doesn't pay attention to forced full unroll
   // attributes so we need to make sure and allow the full unroll pass to pay
   // attention to it.
   if (Phase != ThinOrFullLTOPhase::ThinLTOPreLink || !PGOOpt ||
       PGOOpt->Action != PGOOptions::SampleUse)
     LPM2.addPass(LoopFullUnrollPass(Level.getSpeedupLevel(),

llvm/lib/Transforms/IPO/PassManagerBuilder.cpp

UseCFLAA("use-cfl-aa", cl::init(::CFLAAType::None), cl::Hidden,
              cl::values(clEnumValN(::CFLAAType::None, "none", "Disable CFL-AA"),
                         clEnumValN(::CFLAAType::Steensgaard, "steens",
                                    "Enable unification-based CFL-AA"),
                         clEnumValN(::CFLAAType::Andersen, "anders",
                                    "Enable inclusion-based CFL-AA"),
                         clEnumValN(::CFLAAType::Both, "both",
                                    "Enable both variants of CFL-AA")));
 
-static cl::opt<bool> EnableLoopInterchange(
+cl::opt<bool> EnableLoopInterchange(
     "enable-loopinterchange", cl::init(false), cl::Hidden,
     cl::desc("Enable the new, experimental LoopInterchange Pass"));
 
 cl::opt<bool> EnableUnrollAndJam("enable-unroll-and-jam", cl::init(false),
                                  cl::Hidden,
                                  cl::desc("Enable Unroll And Jam Pass"));
 
 cl::opt<bool> EnableLoopFlatten("enable-loop-flatten", cl::init(false),
                                 cl::Hidden,
                                 cl::desc("Enable the LoopFlatten Pass"));