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Relanding after restricting equalBaseIndex to not erroneuosly consider a FrameIndices stemming from alloca from being comparable as its offset is set post-selectionDAG. Pull FrameIndex comparision reasoning from DAGCombiner::isAlias to general BaseIndexOffset. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306688 91177308-0d34-0410-b5e6-96231b3b80d8
65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
//===-- llvm/CodeGen/SelectionDAGAddressAnalysis.h ------- DAG Address Analysis
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//---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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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/ISDOpcodes.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/CodeGen/SelectionDAGNodes.h"
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namespace llvm {
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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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int64_t Offset;
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bool IsIndexSignExt;
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public:
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BaseIndexOffset() : Offset(0), IsIndexSignExt(false) {}
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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 getIndex() { return Index; }
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bool equalBaseIndex(BaseIndexOffset &Other, const SelectionDAG &DAG) {
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int64_t Off;
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return equalBaseIndex(Other, DAG, Off);
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}
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bool equalBaseIndex(BaseIndexOffset &Other, const SelectionDAG &DAG,
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int64_t &Off);
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/// Parses tree in Ptr for base, index, offset addresses.
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static BaseIndexOffset match(SDValue Ptr, const SelectionDAG &DAG);
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};
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} // namespace llvm
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#endif
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