Add a new convenience pass for testing InstructionSimplify. Previously

it could only be tested indirectly, via instcombine, gvn or some other
pass that makes use of InstructionSimplify, which means that testcases
had to be carefully contrived to dance around any other transformations
that that pass did.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122264 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/InitializePasses.h

@@ -217,6 +217,7 @@ void initializeUnreachableBlockElimPass(PassRegistry&);
 void initializeUnreachableMachineBlockElimPass(PassRegistry&);
 void initializeVerifierPass(PassRegistry&);
 void initializeVirtRegMapPass(PassRegistry&);
+void initializeInstSimplifierPass(PassRegistry&);
 
 }
 

include/llvm/LinkAllPasses.h

@@ -147,6 +147,7 @@ namespace {
       (void) llvm::createLowerAtomicPass();
       (void) llvm::createCorrelatedValuePropagationPass();
       (void) llvm::createMemDepPrinter();
+      (void) llvm::createInstructionSimplifierPass();
 
       (void)new llvm::IntervalPartition();
       (void)new llvm::FindUsedTypes();

include/llvm/Transforms/Scalar.h

@@ -322,6 +322,13 @@ Pass *createLowerAtomicPass();
 //
 Pass *createCorrelatedValuePropagationPass();
 
+//===----------------------------------------------------------------------===//
+//
+// InstructionSimplifier - Remove redundant instructions.
+//
+FunctionPass *createInstructionSimplifierPass();
+extern char &InstructionSimplifierID;
+
 } // End llvm namespace
 
 #endif

lib/Transforms/Utils/CMakeLists.txt

@@ -21,6 +21,7 @@ add_llvm_library(LLVMTransformUtils
   PromoteMemoryToRegister.cpp
   SSAUpdater.cpp
   SimplifyCFG.cpp
+  SimplifyInstructions.cpp
   UnifyFunctionExitNodes.cpp
   Utils.cpp
   ValueMapper.cpp

lib/Transforms/Utils/Utils.cpp

@@ -28,6 +28,7 @@ void llvm::initializeTransformUtils(PassRegistry &Registry) {
   initializeLowerSwitchPass(Registry);
   initializePromotePassPass(Registry);
   initializeUnifyFunctionExitNodesPass(Registry);
+  initializeInstSimplifierPass(Registry);
 }
 
 /// LLVMInitializeTransformUtils - C binding for initializeTransformUtilsPasses.