Revert "Add basic loop fusion pass." Per request.

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358553

Author: echristo

llvm/include/llvm/InitializePasses.h

@@ -219,7 +219,6 @@ void initializeLoopDeletionLegacyPassPass(PassRegistry&);
 void initializeLoopDistributeLegacyPass(PassRegistry&);
 void initializeLoopExtractorPass(PassRegistry&);
 void initializeLoopGuardWideningLegacyPassPass(PassRegistry&);
-void initializeLoopFuseLegacyPass(PassRegistry&);
 void initializeLoopIdiomRecognizeLegacyPassPass(PassRegistry&);
 void initializeLoopInfoWrapperPassPass(PassRegistry&);
 void initializeLoopInstSimplifyLegacyPassPass(PassRegistry&);

llvm/include/llvm/Transforms/Scalar.h

@@ -458,12 +458,6 @@ FunctionPass *createNaryReassociatePass();
 //
 FunctionPass *createLoopDistributePass();
 
-//===----------------------------------------------------------------------===//
-//
-// LoopFuse - Fuse loops.
-//
-FunctionPass *createLoopFusePass();
-
 //===----------------------------------------------------------------------===//
 //
 // LoopLoadElimination - Perform loop-aware load elimination.

llvm/include/llvm/Transforms/Scalar/LoopFuse.h

@@ -122,7 +122,6 @@
 #include "llvm/Transforms/Scalar/LoopDataPrefetch.h"
 #include "llvm/Transforms/Scalar/LoopDeletion.h"
 #include "llvm/Transforms/Scalar/LoopDistribute.h"
-#include "llvm/Transforms/Scalar/LoopFuse.h"
 #include "llvm/Transforms/Scalar/LoopIdiomRecognize.h"
 #include "llvm/Transforms/Scalar/LoopInstSimplify.h"
 #include "llvm/Transforms/Scalar/LoopLoadElimination.h"

llvm/lib/Passes/PassBuilder.cpp

@@ -197,7 +197,6 @@ FUNCTION_PASS("partially-inline-libcalls", PartiallyInlineLibCallsPass())
 FUNCTION_PASS("lcssa", LCSSAPass())
 FUNCTION_PASS("loop-data-prefetch", LoopDataPrefetchPass())
 FUNCTION_PASS("loop-load-elim", LoopLoadEliminationPass())
-FUNCTION_PASS("loop-fuse", LoopFusePass())
 FUNCTION_PASS("loop-distribute", LoopDistributePass())
 FUNCTION_PASS("loop-vectorize", LoopVectorizePass())
 FUNCTION_PASS("pgo-memop-opt", PGOMemOPSizeOpt())

llvm/lib/Passes/PassRegistry.def

@@ -28,7 +28,6 @@ add_llvm_library(LLVMScalarOpts
   LoopDeletion.cpp
   LoopDataPrefetch.cpp
   LoopDistribute.cpp
-  LoopFuse.cpp
   LoopIdiomRecognize.cpp
   LoopInstSimplify.cpp
   LoopInterchange.cpp