Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/CodeGen/SelectionDAGAddressAnalysis.h b/linux-x64/clang/include/llvm/CodeGen/SelectionDAGAddressAnalysis.h
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+++ b/linux-x64/clang/include/llvm/CodeGen/SelectionDAGAddressAnalysis.h
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+//===- SelectionDAGAddressAnalysis.h - DAG Address Analysis -----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H
+#define LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H
+
+#include "llvm/CodeGen/SelectionDAGNodes.h"
+#include <cstdint>
+
+namespace llvm {
+
+class SelectionDAG;
+
+/// Helper struct to parse and store a memory address as base + index + offset.
+/// We ignore sign extensions when it is safe to do so.
+/// The following two expressions are not equivalent. To differentiate we need
+/// to store whether there was a sign extension involved in the index
+/// computation.
+/// (load (i64 add (i64 copyfromreg %c)
+/// (i64 signextend (add (i8 load %index)
+/// (i8 1))))
+/// vs
+///
+/// (load (i64 add (i64 copyfromreg %c)
+/// (i64 signextend (i32 add (i32 signextend (i8 load %index))
+/// (i32 1)))))
+class BaseIndexOffset {
+private:
+ SDValue Base;
+ SDValue Index;
+ int64_t Offset = 0;
+ bool IsIndexSignExt = false;
+
+public:
+ BaseIndexOffset() = default;
+ BaseIndexOffset(SDValue Base, SDValue Index, int64_t Offset,
+ bool IsIndexSignExt)
+ : Base(Base), Index(Index), Offset(Offset),
+ IsIndexSignExt(IsIndexSignExt) {}
+
+ SDValue getBase() { return Base; }
+ SDValue getIndex() { return Index; }
+
+ bool equalBaseIndex(BaseIndexOffset &Other, const SelectionDAG &DAG) {
+ int64_t Off;
+ return equalBaseIndex(Other, DAG, Off);
+ }
+
+ bool equalBaseIndex(BaseIndexOffset &Other, const SelectionDAG &DAG,
+ int64_t &Off);
+
+ /// Parses tree in Ptr for base, index, offset addresses.
+ static BaseIndexOffset match(LSBaseSDNode *N, const SelectionDAG &DAG);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H