Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 78 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/Transforms/Scalar/MemCpyOptimizer.h b/clang-r353983/include/llvm/Transforms/Scalar/MemCpyOptimizer.h
new file mode 100644
index 00000000..5386f58b
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+++ b/clang-r353983/include/llvm/Transforms/Scalar/MemCpyOptimizer.h
@@ -0,0 +1,78 @@
+//===- MemCpyOptimizer.h - memcpy optimization ------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass performs various transformations related to eliminating memcpy
+// calls, or transforming sets of stores into memset's.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
+#define LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H
+
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/PassManager.h"
+#include <cstdint>
+#include <functional>
+
+namespace llvm {
+
+class AssumptionCache;
+class CallInst;
+class DominatorTree;
+class Function;
+class Instruction;
+class MemCpyInst;
+class MemMoveInst;
+class MemoryDependenceResults;
+class MemSetInst;
+class StoreInst;
+class TargetLibraryInfo;
+class Value;
+
+class MemCpyOptPass : public PassInfoMixin<MemCpyOptPass> {
+  MemoryDependenceResults *MD = nullptr;
+  TargetLibraryInfo *TLI = nullptr;
+  std::function<AliasAnalysis &()> LookupAliasAnalysis;
+  std::function<AssumptionCache &()> LookupAssumptionCache;
+  std::function<DominatorTree &()> LookupDomTree;
+
+public:
+  MemCpyOptPass() = default;
+
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+
+  // Glue for the old PM.
+  bool runImpl(Function &F, MemoryDependenceResults *MD_,
+               TargetLibraryInfo *TLI_,
+               std::function<AliasAnalysis &()> LookupAliasAnalysis_,
+               std::function<AssumptionCache &()> LookupAssumptionCache_,
+               std::function<DominatorTree &()> LookupDomTree_);
+
+private:
+  // Helper functions
+  bool processStore(StoreInst *SI, BasicBlock::iterator &BBI);
+  bool processMemSet(MemSetInst *SI, BasicBlock::iterator &BBI);
+  bool processMemCpy(MemCpyInst *M);
+  bool processMemMove(MemMoveInst *M);
+  bool performCallSlotOptzn(Instruction *cpy, Value *cpyDst, Value *cpySrc,
+                            uint64_t cpyLen, unsigned cpyAlign, CallInst *C);
+  bool processMemCpyMemCpyDependence(MemCpyInst *M, MemCpyInst *MDep);
+  bool processMemSetMemCpyDependence(MemCpyInst *M, MemSetInst *MDep);
+  bool performMemCpyToMemSetOptzn(MemCpyInst *M, MemSetInst *MDep);
+  bool processByValArgument(CallSite CS, unsigned ArgNo);
+  Instruction *tryMergingIntoMemset(Instruction *I, Value *StartPtr,
+                                    Value *ByteVal);
+
+  bool iterateOnFunction(Function &F);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_SCALAR_MEMCPYOPTIMIZER_H