Coverage Report

Created: 2019-07-24 05:18

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/include/llvm/CodeGen/SelectionDAGAddressAnalysis.h
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//===- SelectionDAGAddressAnalysis.h - DAG Address Analysis -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H
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#define LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H
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#include "llvm/CodeGen/SelectionDAGNodes.h"
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#include <cstdint>
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namespace llvm {
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class SelectionDAG;
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/// Helper struct to parse and store a memory address as base + index + offset.
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/// We ignore sign extensions when it is safe to do so.
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/// The following two expressions are not equivalent. To differentiate we need
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/// to store whether there was a sign extension involved in the index
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/// computation.
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///  (load (i64 add (i64 copyfromreg %c)
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///                 (i64 signextend (add (i8 load %index)
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///                                      (i8 1))))
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/// vs
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///
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/// (load (i64 add (i64 copyfromreg %c)
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///                (i64 signextend (i32 add (i32 signextend (i8 load %index))
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///                                         (i32 1)))))
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class BaseIndexOffset {
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private:
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  SDValue Base;
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  SDValue Index;
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  Optional<int64_t> Offset;
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  bool IsIndexSignExt = false;
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public:
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3.75M
  BaseIndexOffset() = default;
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  BaseIndexOffset(SDValue Base, SDValue Index, bool IsIndexSignExt)
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      : Base(Base), Index(Index), Offset(), IsIndexSignExt(IsIndexSignExt) {}
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  BaseIndexOffset(SDValue Base, SDValue Index, int64_t Offset,
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                  bool IsIndexSignExt)
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      : Base(Base), Index(Index), Offset(Offset),
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        IsIndexSignExt(IsIndexSignExt) {}
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  SDValue getBase() { return Base; }
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  SDValue getBase() const { return Base; }
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  SDValue getIndex() { return Index; }
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0
  SDValue getIndex() const { return Index; }
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  bool hasValidOffset() const { return Offset.hasValue(); }
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  // Returns true if `Other` and `*this` are both some offset from the same base
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  // pointer. In that case, `Off` is set to the offset between `*this` and
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  // `Other` (negative if `Other` is before `*this`).
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  bool equalBaseIndex(const BaseIndexOffset &Other, const SelectionDAG &DAG,
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                      int64_t &Off) const;
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  bool equalBaseIndex(const BaseIndexOffset &Other,
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                      const SelectionDAG &DAG) const {
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    int64_t Off;
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    return equalBaseIndex(Other, DAG, Off);
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  }
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  // Returns true if `Other` (with size `OtherSize`) can be proven to be fully
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  // contained in `*this` (with size `Size`).
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  bool contains(const SelectionDAG &DAG, int64_t BitSize,
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                const BaseIndexOffset &Other, int64_t OtherBitSize,
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                int64_t &BitOffset) const;
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  bool contains(const SelectionDAG &DAG, int64_t BitSize,
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                const BaseIndexOffset &Other, int64_t OtherBitSize) const {
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    int64_t BitOffset;
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    return contains(DAG, BitSize, Other, OtherBitSize, BitOffset);
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  }
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  // Returns true `Op0` and `Op1` can be proven to alias/not alias, in
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  // which case `IsAlias` is set to true/false.
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  static bool computeAliasing(const SDNode *Op0,
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                              const Optional<int64_t> NumBytes0,
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                              const SDNode *Op1,
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                              const Optional<int64_t> NumBytes1,
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                              const SelectionDAG &DAG, bool &IsAlias);
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  /// Parses tree in N for base, index, offset addresses.
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  static BaseIndexOffset match(const SDNode *N, const SelectionDAG &DAG);
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  void print(raw_ostream& OS) const;
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  void dump() const;
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};
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} // end namespace llvm
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#endif // LLVM_CODEGEN_SELECTIONDAGADDRESSANALYSIS_H