[CodeGenPrepare] Move CodeGenPrepare into lib/CodeGen.

CodeGenPrepare uses extensively TargetLowering which is part of libLLVMCodeGen.
This is a layer violation which would introduce eventually a dependence on
CodeGen in ScalarOpts.

Move CodeGenPrepare into libLLVMCodeGen to avoid that.

Follow-up of <rdar://problem/15519855>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201912 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/Passes.h

@@ -370,6 +370,10 @@ namespace llvm {
   createMachineFunctionPrinterPass(raw_ostream &OS,
                                    const std::string &Banner ="");
 
+  /// createCodeGenPreparePass - Transform the code to expose more pattern
+  /// matching during instruction selection.
+  FunctionPass *createCodeGenPreparePass(const TargetMachine *TM = 0);
+
   /// MachineLoopInfo - This pass is a loop analysis pass.
   extern char &MachineLoopInfoID;
 

include/llvm/Transforms/Scalar.h

@@ -316,12 +316,6 @@ Pass *createLoopDeletionPass();
 //
 FunctionPass *createConstantHoistingPass();
 
-//===----------------------------------------------------------------------===//
-//
-// CodeGenPrepare - This pass prepares a function for instruction selection.
-//
-FunctionPass *createCodeGenPreparePass(const TargetMachine *TM = 0);
-
 //===----------------------------------------------------------------------===//
 //
 // InstructionNamer - Give any unnamed non-void instructions "tmp" names.

lib/CodeGen/CMakeLists.txt

@@ -7,6 +7,7 @@ add_llvm_library(LLVMCodeGen
   CalcSpillWeights.cpp
   CallingConvLower.cpp
   CodeGen.cpp
+  CodeGenPrepare.cpp
   CriticalAntiDepBreaker.cpp
   DFAPacketizer.cpp
   DeadMachineInstructionElim.cpp

lib/CodeGen/CodeGen.cpp

@@ -22,6 +22,7 @@ using namespace llvm;
 void llvm::initializeCodeGen(PassRegistry &Registry) {
   initializeBasicTTIPass(Registry);
   initializeBranchFolderPassPass(Registry);
+  initializeCodeGenPreparePass(Registry);
   initializeDeadMachineInstructionElimPass(Registry);
   initializeEarlyIfConverterPass(Registry);
   initializeExpandPostRAPass(Registry);

lib/CodeGen/CodeGenPrepare.cpp

@@ -14,7 +14,7 @@
 //===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "codegenprepare"
-#include "llvm/Transforms/Scalar.h"
+#include "llvm/CodeGen/Passes.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/Statistic.h"

lib/Transforms/Scalar/CMakeLists.txt

@@ -1,6 +1,5 @@
 add_llvm_library(LLVMScalarOpts
   ADCE.cpp
-  CodeGenPrepare.cpp
   ConstantHoisting.cpp
   ConstantProp.cpp
   CorrelatedValuePropagation.cpp

lib/Transforms/Scalar/Scalar.cpp

@@ -29,7 +29,6 @@ using namespace llvm;
 void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeADCEPass(Registry);
   initializeSampleProfileLoaderPass(Registry);
-  initializeCodeGenPreparePass(Registry);
   initializeConstantHoistingPass(Registry);
   initializeConstantPropagationPass(Registry);
   initializeCorrelatedValuePropagationPass(Registry);

tools/bugpoint/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(LLVM_LINK_COMPONENTS
   Analysis
   BitWriter
+  CodeGen
   Core
   IPA
   IPO

tools/bugpoint/LLVMBuild.txt

@@ -19,4 +19,4 @@
 type = Tool
 name = bugpoint
 parent = Tools
-required_libraries = AsmParser BitReader BitWriter IRReader IPO Instrumentation Linker Scalar ObjCARC
+required_libraries = AsmParser BitReader BitWriter CodeGen IRReader IPO Instrumentation Linker Scalar ObjCARC

tools/bugpoint/Makefile

@@ -10,7 +10,7 @@
 LEVEL := ../..
 TOOLNAME := bugpoint
 LINK_COMPONENTS := asmparser instrumentation scalaropts ipo linker bitreader \
-                   bitwriter irreader vectorize objcarcopts
+                   bitwriter irreader vectorize objcarcopts codegen
 
 # Support plugins.
 NO_DEAD_STRIP := 1

tools/opt/CMakeLists.txt

@@ -2,6 +2,7 @@ set(LLVM_LINK_COMPONENTS
   ${LLVM_TARGETS_TO_BUILD}
   Analysis
   BitWriter
+  CodeGen
   Core
   IPA
   IPO

tools/opt/LLVMBuild.txt

@@ -19,4 +19,4 @@
 type = Tool
 name = opt
 parent = Tools
-required_libraries = AsmParser BitReader BitWriter IRReader IPO Instrumentation Scalar ObjCARC all-targets
+required_libraries = AsmParser BitReader BitWriter CodeGen IRReader IPO Instrumentation Scalar ObjCARC all-targets

tools/opt/Makefile

@@ -9,7 +9,7 @@
 
 LEVEL := ../..
 TOOLNAME := opt
-LINK_COMPONENTS := bitreader bitwriter asmparser irreader instrumentation scalaropts objcarcopts ipo vectorize all-targets
+LINK_COMPONENTS := bitreader bitwriter asmparser irreader instrumentation scalaropts objcarcopts ipo vectorize all-targets codegen
 
 # Support plugins.
 NO_DEAD_STRIP := 1

tools/opt/opt.cpp

@@ -22,6 +22,7 @@
 #include "llvm/Analysis/RegionPass.h"
 #include "llvm/Bitcode/BitcodeWriterPass.h"
 #include "llvm/CodeGen/CommandFlags.h"
+#include "llvm/InitializePasses.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/LLVMContext.h"
@@ -340,6 +341,9 @@ int main(int argc, char **argv) {
   initializeInstCombine(Registry);
   initializeInstrumentation(Registry);
   initializeTarget(Registry);
+  // For codegen passes, only passes that do IR to IR transformation are
+  // supported. For now, just add CodeGenPrepare.
+  initializeCodeGenPreparePass(Registry);
 
   cl::ParseCommandLineOptions(argc, argv,
     "llvm .bc -> .bc modular optimizer and analysis printer\n");