[SYCL][NFC] Move LowerWGScope pass to LLVM project (#1306)

LowerWGScope pass is an llvm pass that performs SYCL specific
transformations in LLVM IR right after frontend. LLVM passes are
supposed to be in llvm project and not in clang project.

Add lit tests for SYCL specific CodeGen and LowerWGScope pass

Signed-off-by: Artur Gainullin <[email protected]>

Author: againull

clang/lib/CodeGen/BackendUtil.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/CodeGen/BackendUtil.h"
-#include "SYCLLowerIR/LowerWGScope.h"
 #include "clang/Basic/CodeGenOptions.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/LangOptions.h"

clang/lib/CodeGen/CMakeLists.txt

@@ -1,5 +1,3 @@
-add_subdirectory(SYCLLowerIR)
-
 set(LLVM_LINK_COMPONENTS
   Analysis
   BitReader
@@ -23,6 +21,7 @@ set(LLVM_LINK_COMPONENTS
   Remarks
   ScalarOpts
   Support
+  SYCLLowerIR
   Target
   TransformUtils
   )
@@ -112,5 +111,4 @@ add_clang_library(clangCodeGen
   clangFrontend
   clangLex
   clangSerialization
-  clangSYCLLowerIR
   )

clang/lib/CodeGen/CodeGenAction.cpp

@@ -10,7 +10,6 @@
 #include "CodeGenModule.h"
 #include "CoverageMappingGen.h"
 #include "MacroPPCallbacks.h"
-#include "SYCLLowerIR/LowerWGScope.h"
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/DeclCXX.h"
@@ -39,6 +38,7 @@
 #include "llvm/IRReader/IRReader.h"
 #include "llvm/Linker/Linker.h"
 #include "llvm/Pass.h"
+#include "llvm/SYCLLowerIR/LowerWGScope.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/TimeProfiler.h"
@@ -335,7 +335,7 @@ namespace clang {
       if (LangOpts.SYCLIsDevice) {
         PrettyStackTraceString CrashInfo("Pre-linking SYCL passes");
         legacy::PassManager PreLinkingSyclPasses;
-        PreLinkingSyclPasses.add(createSYCLLowerWGScopePass());
+        PreLinkingSyclPasses.add(llvm::createSYCLLowerWGScopePass());
         PreLinkingSyclPasses.run(*getModule());
       }
 

clang/lib/CodeGen/SYCLLowerIR/CMakeLists.txt

@@ -404,6 +404,7 @@ void initializeStripNonDebugSymbolsPass(PassRegistry&);
 void initializeStripNonLineTableDebugInfoPass(PassRegistry&);
 void initializeStripSymbolsPass(PassRegistry&);
 void initializeStructurizeCFGPass(PassRegistry&);
+void initializeSYCLLowerWGScopeLegacyPassPass(PassRegistry &);
 void initializeTailCallElimPass(PassRegistry&);
 void initializeTailDuplicatePass(PassRegistry&);
 void initializeTargetLibraryInfoWrapperPassPass(PassRegistry&);

clang/test/CodeGenSYCL/hier_par.cpp

@@ -37,6 +37,7 @@
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/IRPrintingPasses.h"
+#include "llvm/SYCLLowerIR/LowerWGScope.h"
 #include "llvm/Support/Valgrind.h"
 #include "llvm/Transforms/AggressiveInstCombine/AggressiveInstCombine.h"
 #include "llvm/Transforms/IPO.h"
@@ -199,6 +200,7 @@ namespace {
       (void) llvm::createMergeFunctionsPass();
       (void) llvm::createMergeICmpsLegacyPass();
       (void) llvm::createExpandMemCmpPass();
+      (void)llvm::createSYCLLowerWGScopePass();
       std::string buf;
       llvm::raw_string_ostream os(buf);
       (void) llvm::createPrintModulePass(os);

llvm/include/llvm/InitializePasses.h

@@ -25,7 +25,6 @@ class SYCLLowerWGScopePass : public PassInfoMixin<SYCLLowerWGScopePass> {
 };
 
 FunctionPass *createSYCLLowerWGScopePass();
-void initializeSYCLLowerWGScopeLegacyPassPass(PassRegistry &);
 
 } // namespace llvm
 

llvm/include/llvm/LinkAllPasses.h

@@ -27,6 +27,7 @@ add_subdirectory(AsmParser)
 add_subdirectory(LineEditor)
 add_subdirectory(ProfileData)
 add_subdirectory(Passes)
+add_subdirectory(SYCLLowerIR)
 add_subdirectory(TextAPI)
 add_subdirectory(ToolDrivers)
 add_subdirectory(XRay)

clang/lib/CodeGen/SYCLLowerIR/LowerWGScope.h renamed to llvm/include/llvm/SYCLLowerIR/LowerWGScope.h

@@ -42,6 +42,7 @@ subdirectories =
  Passes
  ProfileData
  Support
+ SYCLLowerIR
  TableGen
  TextAPI
  Target