[SYCL][NFC] Extract specialization constant's processing from sycl-post-link to SYCLPostLink library.

llvm/include/llvm/SYCLPostLink/SpecializationConstants.h

@@ -0,0 +1,42 @@
+//= SpecializationConstants.h - Processing of SYCL Specialization Constants ==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Specialization constants processing consists of lowering and generation
+// of new module with spec consts replaced by default values.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYCL_POST_LINK_SPECIALIZATION_CONSTANTS_H
+#define LLVM_SYCL_POST_LINK_SPECIALIZATION_CONSTANTS_H
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/SYCLLowerIR/SpecConstants.h"
+#include "llvm/SYCLPostLink/ModuleSplitter.h"
+
+#include <optional>
+
+namespace llvm {
+namespace sycl {
+
+/// Metadata and intrinsics related to SYCL specialization constants are lowered
+/// depending on the given
+/// \p Mode. If \p Mode is std::nullopt, then no lowering happens.
+/// If \p GenerateModuleDescWithDefaultSpecConsts is true, then a generation
+/// of new modules with specialization constants replaced by default values
+/// happens and the result is written in \p NewModuleDescs.
+///
+/// \returns Boolean value indicating whether the lowering has changed the input
+/// modules.
+bool handleSpecializationConstants(
+    llvm::SmallVectorImpl<module_split::ModuleDesc> &MDs,
+    std::optional<SpecConstantsPass::HandlingMode> Mode,
+    llvm::SmallVectorImpl<module_split::ModuleDesc> &NewModuleDescs,
+    bool GenerateModuleDescWithDefaultSpecConsts);
+
+} // namespace sycl
+} // namespace llvm
+
+#endif // LLVM_SYCL_POST_LINK_SPECIALIZATION_CONSTANTS_H

llvm/lib/SYCLPostLink/CMakeLists.txt

@@ -2,6 +2,7 @@ add_llvm_component_library(LLVMSYCLPostLink
   ComputeModuleRuntimeInfo.cpp
   ESIMDPostSplitProcessing.cpp
   ModuleSplitter.cpp
+  SpecializationConstants.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/SYCLPostLink

llvm/lib/SYCLPostLink/SpecializationConstants.cpp

@@ -0,0 +1,93 @@
+//= SpecializationConstants.cpp - Processing of SYCL Specialization Constants //
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// See comments in the header.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/SYCLPostLink/SpecializationConstants.h"
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/PassManager.h"
+#include "llvm/Passes/PassBuilder.h"
+#include "llvm/SYCLLowerIR/SpecConstants.h"
+#include "llvm/SYCLPostLink/ModuleSplitter.h"
+#include "llvm/Transforms/IPO/StripDeadPrototypes.h"
+
+#include <optional>
+
+using namespace llvm;
+
+namespace {
+
+bool lowerSpecConstants(module_split::ModuleDesc &MD,
+                        SpecConstantsPass::HandlingMode Mode) {
+  ModulePassManager RunSpecConst;
+  ModuleAnalysisManager MAM;
+  SpecConstantsPass SCP(Mode);
+  // Register required analysis.
+  MAM.registerPass([&] { return PassInstrumentationAnalysis(); });
+  RunSpecConst.addPass(std::move(SCP));
+
+  // Perform the specialization constant intrinsics transformation on resulting
+  // module.
+  PreservedAnalyses Res = RunSpecConst.run(MD.getModule(), MAM);
+  MD.Props.SpecConstsMet = !Res.areAllPreserved();
+  return MD.Props.SpecConstsMet;
+}
+
+/// Function generates the copy of the given \p MD where all uses of
+/// Specialization constants are replaced by corresponding default values.
+/// If the Module in \p MD doesn't contain specialization constants then
+/// std::nullopt is returned.
+std::optional<module_split::ModuleDesc>
+cloneModuleWithSpecConstsReplacedByDefaultValues(
+    const module_split::ModuleDesc &MD) {
+  std::optional<module_split::ModuleDesc> NewMD;
+  if (!checkModuleContainsSpecConsts(MD.getModule()))
+    return NewMD;
+
+  NewMD = MD.clone();
+  NewMD->setSpecConstantDefault(true);
+
+  ModulePassManager MPM;
+  ModuleAnalysisManager MAM;
+  SpecConstantsPass SCP(SpecConstantsPass::HandlingMode::default_values);
+  MAM.registerPass([&] { return PassInstrumentationAnalysis(); });
+  MPM.addPass(std::move(SCP));
+  MPM.addPass(StripDeadPrototypesPass());
+
+  PreservedAnalyses Res = MPM.run(NewMD->getModule(), MAM);
+  NewMD->Props.SpecConstsMet = !Res.areAllPreserved();
+  assert(NewMD->Props.SpecConstsMet &&
+         "SpecConstsMet should be true since the presence of SpecConsts "
+         "has been checked before the run of the pass");
+  NewMD->rebuildEntryPoints();
+  return NewMD;
+}
+
+} // namespace
+
+bool llvm::sycl::handleSpecializationConstants(
+    SmallVectorImpl<module_split::ModuleDesc> &MDs,
+    std::optional<SpecConstantsPass::HandlingMode> Mode,
+    SmallVectorImpl<module_split::ModuleDesc> &NewModuleDescs,
+    bool GenerateModuleDescWithDefaultSpecConsts) {
+  bool Modified = false;
+  for (module_split::ModuleDesc &MD : MDs) {
+    if (GenerateModuleDescWithDefaultSpecConsts)
+      if (std::optional<module_split::ModuleDesc> NewMD =
+              cloneModuleWithSpecConstsReplacedByDefaultValues(MD))
+        NewModuleDescs.push_back(std::move(*NewMD));
+
+    if (Mode)
+      Modified |= lowerSpecConstants(MD, *Mode);
+  }
+
+  return Modified;
+}

llvm/tools/sycl-post-link/sycl-post-link.cpp

@@ -40,6 +40,7 @@
 #include "llvm/SYCLPostLink/ComputeModuleRuntimeInfo.h"
 #include "llvm/SYCLPostLink/ESIMDPostSplitProcessing.h"
 #include "llvm/SYCLPostLink/ModuleSplitter.h"
+#include "llvm/SYCLPostLink/SpecializationConstants.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/InitLLVM.h"
@@ -48,7 +49,6 @@
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/SystemUtils.h"
 #include "llvm/Support/WithColor.h"
-#include "llvm/Transforms/IPO/StripDeadPrototypes.h"
 
 #include <algorithm>
 #include <memory>
@@ -429,56 +429,6 @@ void saveDeviceLibModule(
   saveModule(OutTables, DeviceLibMD, I, OutputPrefix, "");
 }
 
-bool processSpecConstants(module_split::ModuleDesc &MD) {
-  MD.Props.SpecConstsMet = false;
-
-  if (SpecConstLower.getNumOccurrences() == 0)
-    return false;
-
-  ModulePassManager RunSpecConst;
-  ModuleAnalysisManager MAM;
-  SpecConstantsPass SCP(SpecConstLower == SC_NATIVE_MODE
-                            ? SpecConstantsPass::HandlingMode::native
-                            : SpecConstantsPass::HandlingMode::emulation);
-  // Register required analysis
-  MAM.registerPass([&] { return PassInstrumentationAnalysis(); });
-  RunSpecConst.addPass(std::move(SCP));
-
-  // Perform the spec constant intrinsics transformation on resulting module
-  PreservedAnalyses Res = RunSpecConst.run(MD.getModule(), MAM);
-  MD.Props.SpecConstsMet = !Res.areAllPreserved();
-  return MD.Props.SpecConstsMet;
-}
-
-/// Function generates the copy of the given ModuleDesc where all uses of
-/// Specialization Constants are replaced by corresponding default values.
-/// If the Module in MD doesn't contain specialization constants then
-/// std::nullopt is returned.
-std::optional<module_split::ModuleDesc>
-processSpecConstantsWithDefaultValues(const module_split::ModuleDesc &MD) {
-  std::optional<module_split::ModuleDesc> NewModuleDesc;
-  if (!checkModuleContainsSpecConsts(MD.getModule()))
-    return NewModuleDesc;
-
-  NewModuleDesc = MD.clone();
-  NewModuleDesc->setSpecConstantDefault(true);
-
-  ModulePassManager MPM;
-  ModuleAnalysisManager MAM;
-  SpecConstantsPass SCP(SpecConstantsPass::HandlingMode::default_values);
-  MAM.registerPass([&] { return PassInstrumentationAnalysis(); });
-  MPM.addPass(std::move(SCP));
-  MPM.addPass(StripDeadPrototypesPass());
-
-  PreservedAnalyses Res = MPM.run(NewModuleDesc->getModule(), MAM);
-  NewModuleDesc->Props.SpecConstsMet = !Res.areAllPreserved();
-  assert(NewModuleDesc->Props.SpecConstsMet &&
-         "This property should be true since the presence of SpecConsts "
-         "has been checked before the run of the pass");
-  NewModuleDesc->rebuildEntryPoints();
-  return NewModuleDesc;
-}
-
 constexpr int MAX_COLUMNS_IN_FILE_TABLE = 3;
 
 void addTableRow(util::SimpleTable &Table,
@@ -602,6 +552,12 @@ processInputModule(std::unique_ptr<Module> M, const StringRef OutputPrefix) {
       error(toString(std::move(E)));
   }
 
+  std::optional<SpecConstantsPass::HandlingMode> SCMode;
+  if (SpecConstLower.getNumOccurrences() > 0)
+    SCMode = SpecConstLower == SC_NATIVE_MODE
+                 ? SpecConstantsPass::HandlingMode::native
+                 : SpecConstantsPass::HandlingMode::emulation;
+
   // It is important that we *DO NOT* preserve all the splits in memory at the
   // same time, because it leads to a huge RAM consumption by the tool on bigger
   // inputs.
@@ -624,16 +580,9 @@ processInputModule(std::unique_ptr<Module> M, const StringRef OutputPrefix) {
     SmallVector<module_split::ModuleDesc, 2> &MMs = *ModulesOrErr;
     assert(MMs.size() && "at least one module is expected after ESIMD split");
     SmallVector<module_split::ModuleDesc, 2> MMsWithDefaultSpecConsts;
-    for (size_t I = 0; I != MMs.size(); ++I) {
-      if (GenerateDeviceImageWithDefaultSpecConsts) {
-        std::optional<module_split::ModuleDesc> NewMD =
-            processSpecConstantsWithDefaultValues(MMs[I]);
-        if (NewMD)
-          MMsWithDefaultSpecConsts.push_back(std::move(*NewMD));
-      }
-
-      Modified |= processSpecConstants(MMs[I]);
-    }
+    Modified |=
+        handleSpecializationConstants(MMs, SCMode, MMsWithDefaultSpecConsts,
+                                      GenerateDeviceImageWithDefaultSpecConsts);
 
     if (IROutputOnly) {
       if (SplitOccurred) {