Start of a pass for recognizing memset and memcpy idioms.

No functionality yet.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122562 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/InitializePasses.h

@@ -133,6 +133,7 @@ void initializeLoopSplitterPass(PassRegistry&);
 void initializeLoopStrengthReducePass(PassRegistry&);
 void initializeLoopUnrollPass(PassRegistry&);
 void initializeLoopUnswitchPass(PassRegistry&);
+void initializeLoopIdiomRecognizePass(PassRegistry&);
 void initializeLowerAtomicPass(PassRegistry&);
 void initializeLowerIntrinsicsPass(PassRegistry&);
 void initializeLowerInvokePass(PassRegistry&);

include/llvm/LinkAllPasses.h

@@ -90,6 +90,7 @@ namespace {
       (void) llvm::createLoopStrengthReducePass();
       (void) llvm::createLoopUnrollPass();
       (void) llvm::createLoopUnswitchPass();
+      (void) llvm::createLoopIdiomPass();
       (void) llvm::createLoopRotatePass();
       (void) llvm::createLowerInvokePass();
       (void) llvm::createLowerSetJmpPass();

include/llvm/Transforms/Scalar.h

@@ -129,6 +129,12 @@ Pass *createLoopUnrollPass();
 //
 Pass *createLoopRotatePass();
 
+//===----------------------------------------------------------------------===//
+//
+// LoopIdiom - This pass recognizes and replaces idioms in loops.
+//
+Pass *createLoopIdiomPass();
+  
 //===----------------------------------------------------------------------===//
 //
 // PromoteMemoryToRegister - This pass is used to promote memory references to

lib/Transforms/Scalar/CMakeLists.txt

@@ -12,6 +12,7 @@ add_llvm_library(LLVMScalarOpts
   JumpThreading.cpp
   LICM.cpp
   LoopDeletion.cpp
+  LoopIdiomRecognize.cpp
   LoopRotation.cpp
   LoopStrengthReduce.cpp
   LoopUnrollPass.cpp

lib/Transforms/Scalar/Scalar.cpp

@@ -44,6 +44,7 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeLoopStrengthReducePass(Registry);
   initializeLoopUnrollPass(Registry);
   initializeLoopUnswitchPass(Registry);
+  initializeLoopIdiomRecognizePass(Registry);
   initializeLowerAtomicPass(Registry);
   initializeMemCpyOptPass(Registry);
   initializeReassociatePass(Registry);